Annotation of loncom/interface/lonnavmaps.pm, revision 1.440

1.2       www         1: # The LearningOnline Network with CAPA
                      2: # Navigate Maps Handler
1.1       www         3: #
1.440   ! bisitz      4: # $Id: lonnavmaps.pm,v 1.439 2009/11/23 14:56:07 wenzelju Exp $
1.437     foxr        5: 
1.20      albertel    6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
                     13: # the Free Software Foundation; either version 2 of the License, or
                     14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
                     23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
                     27: # http://www.lon-capa.org/
                     28: #
1.245     www        29: ###
1.2       www        30: 
1.416     jms        31: =pod
                     32: 
                     33: =head1 NAME
                     34: 
1.435     raeburn    35: Apache::lonnavmaps - Subroutines to handle and render the navigation
1.416     jms        36: 
                     37: =head1 SYNOPSIS
                     38: 
                     39: Handles navigational maps.
                     40: 
                     41: The main handler generates the navigational listing for the course,
                     42: the other objects export this information in a usable fashion for
                     43: other modules.
                     44: 
                     45: 
                     46: This is part of the LearningOnline Network with CAPA project
                     47: described at http://www.lon-capa.org.
                     48: 
                     49: 
                     50: =head1 OVERVIEW
                     51: 
1.439     wenzelju   52: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
1.416     jms        53: course structure and caches it in what is often referred to as the
                     54: "big hash" X<big hash>. You can see it if you are logged into
                     55: LON-CAPA, in a course, by going to /adm/test. (You may need to
                     56: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
                     57: content of the hash will be under the heading "Big Hash".
                     58: 
                     59: Big Hash contains, among other things, how resources are related
                     60: to each other (next/previous), what resources are maps, which 
                     61: resources are being chosen to not show to the student (for random
                     62: selection), and a lot of other things that can take a lot of time
                     63: to compute due to the amount of data that needs to be collected and
                     64: processed.
                     65: 
                     66: Apache::lonnavmaps provides an object model for manipulating this
                     67: information in a higher-level fashion than directly manipulating 
                     68: the hash. It also provides access to several auxilary functions 
                     69: that aren't necessarily stored in the Big Hash, but are a per-
                     70: resource sort of value, like whether there is any feedback on 
                     71: a given resource.
                     72: 
                     73: Apache::lonnavmaps also abstracts away branching, and someday, 
                     74: conditions, for the times where you don't really care about those
                     75: things.
                     76: 
                     77: Apache::lonnavmaps also provides fairly powerful routines for
                     78: rendering navmaps, and last but not least, provides the navmaps
                     79: view for when the user clicks the NAV button.
                     80: 
                     81: B<Note>: Apache::lonnavmaps I<only> works for the "currently
                     82: logged in user"; if you want things like "due dates for another
                     83: student" lonnavmaps can not directly retrieve information like
                     84: that. You need the EXT function. This module can still help,
                     85: because many things, such as the course structure, are constant
                     86: between users, and Apache::lonnavmaps can help by providing
                     87: symbs for the EXT call.
                     88: 
                     89: The rest of this file will cover the provided rendering routines, 
                     90: which can often be used without fiddling with the navmap object at
                     91: all, then documents the Apache::lonnavmaps::navmap object, which
                     92: is the key to accessing the Big Hash information, covers the use
                     93: of the Iterator (which provides the logic for traversing the 
                     94: somewhat-complicated Big Hash data structure), documents the
                     95: Apache::lonnavmaps::Resource objects that are returned by 
                     96: 
                     97: =head1 Subroutine: render
                     98: 
                     99: The navmap renderer package provides a sophisticated rendering of the
                    100: standard navigation maps interface into HTML. The provided nav map
                    101: handler is actually just a glorified call to this.
                    102: 
                    103: Because of the large number of parameters this function accepts,
                    104: instead of passing it arguments as is normal, pass it in an anonymous
                    105: hash with the desired options.
                    106: 
                    107: The package provides a function called 'render', called as
                    108: Apache::lonnavmaps::render({}).
                    109: 
                    110: =head2 Overview of Columns
                    111: 
                    112: The renderer will build an HTML table for the navmap and return
                    113: it. The table consists of several columns, and a row for each
                    114: resource (or possibly each part). You tell the renderer how many
                    115: columns to create and what to place in each column, optionally using
                    116: one or more of the prepared columns, and the renderer will assemble
                    117: the table.
                    118: 
                    119: Any additional generally useful column types should be placed in the
                    120: renderer code here, so anybody can use it anywhere else. Any code
                    121: specific to the current application (such as the addition of <input>
                    122: elements in a column) should be placed in the code of the thing using
                    123: the renderer.
                    124: 
                    125: At the core of the renderer is the array reference COLS (see Example
                    126: section below for how to pass this correctly). The COLS array will
                    127: consist of entries of one of two types of things: Either an integer
                    128: representing one of the pre-packaged column types, or a sub reference
                    129: that takes a resource reference, a part number, and a reference to the
                    130: argument hash passed to the renderer, and returns a string that will
                    131: be inserted into the HTML representation as it.
                    132: 
                    133: All other parameters are ways of either changing how the columns
                    134: are printing, or which rows are shown.
                    135: 
                    136: The pre-packaged column names are refered to by constants in the
                    137: Apache::lonnavmaps namespace. The following currently exist:
                    138: 
                    139: =over 4
                    140: 
                    141: =item * B<Apache::lonnavmaps::resource>:
                    142: 
                    143: The general info about the resource: Link, icon for the type, etc. The
                    144: first column in the standard nav map display. This column provides the
                    145: indentation effect seen in the B<NAV> screen. This column also accepts
                    146: the following parameters in the renderer hash:
                    147: 
                    148: =over 4
                    149: 
                    150: =item * B<resource_nolink>: default false
                    151: 
                    152: If true, the resource will not be linked. By default, all non-folder
                    153: resources are linked.
                    154: 
                    155: =item * B<resource_part_count>: default true
                    156: 
                    157: If true, the resource will show a part count B<if> the full
                    158: part list is not displayed. (See "condense_parts" later.) If false,
                    159: the resource will never show a part count.
                    160: 
                    161: =item * B<resource_no_folder_link>:
                    162: 
                    163: If true, the resource's folder will not be clickable to open or close
                    164: it. Default is false. True implies printCloseAll is false, since you
                    165: can't close or open folders when this is on anyhow.
                    166: 
                    167: =back
                    168: 
                    169: =item * B<Apache::lonnavmaps::communication_status>:
                    170: 
                    171: Whether there is discussion on the resource, email for the user, or
                    172: (lumped in here) perl errors in the execution of the problem. This is
                    173: the second column in the main nav map.
                    174: 
                    175: =item * B<Apache::lonnavmaps::quick_status>:
                    176: 
                    177: An icon for the status of a problem, with five possible states:
                    178: Correct, incorrect, open, awaiting grading (for a problem where the
                    179: computer's grade is suppressed, or the computer can't grade, like
                    180: essay problem), or none (not open yet, not a problem). The
                    181: third column of the standard navmap.
                    182: 
                    183: =item * B<Apache::lonnavmaps::long_status>:
                    184: 
                    185: A text readout of the details of the current status of the problem,
                    186: such as "Due in 22 hours". The fourth column of the standard navmap.
                    187: 
                    188: =item * B<Apache::lonnavmaps::part_status_summary>:
                    189: 
                    190: A text readout summarizing the status of the problem. If it is a
                    191: single part problem, will display "Correct", "Incorrect", 
                    192: "Not yet open", "Open", "Attempted", or "Error". If there are
                    193: multiple parts, this will output a string that in HTML will show a
                    194: status of how many parts are in each status, in color coding, trying
                    195: to match the colors of the icons within reason.
1.1       www       196: 
1.416     jms       197: Note this only makes sense if you are I<not> showing parts. If 
                    198: C<showParts> is true (see below), this column will not output
                    199: anything. 
1.2       www       200: 
1.416     jms       201: =back
1.133     bowersj2  202: 
1.416     jms       203: If you add any others please be sure to document them here.
1.133     bowersj2  204: 
1.416     jms       205: An example of a column renderer that will show the ID number of a
                    206: resource, along with the part name if any:
1.140     bowersj2  207: 
1.416     jms       208:  sub { 
                    209:   my ($resource, $part, $params) = @_;   
                    210:   if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
                    211:   return '<td>' . $resource->{ID} . '</td>';
                    212:  }
1.135     bowersj2  213: 
1.416     jms       214: Note these functions are responsible for the TD tags, which allow them
                    215: to override vertical and horizontal alignment, etc.
1.133     bowersj2  216: 
1.416     jms       217: =head2 Parameters
1.130     www       218: 
1.416     jms       219: Minimally, you should be
                    220: able to get away with just using 'cols' (to specify the columns
                    221: shown), 'url' (necessary for the folders to link to the current screen
                    222: correctly), and possibly 'queryString' if your app calls for it. In
                    223: that case, maintaining the state of the folders will be done
                    224: automatically.
1.268     albertel  225: 
1.416     jms       226: =over 4
1.268     albertel  227: 
1.416     jms       228: =item * B<iterator>: default: constructs one from %env
1.51      bowersj2  229: 
1.416     jms       230: A reference to a fresh ::iterator to use from the navmaps. The
                    231: rendering will reflect the options passed to the iterator, so you can
                    232: use that to just render a certain part of the course, if you like. If
                    233: one is not passed, the renderer will attempt to construct one from
                    234: env{'form.filter'} and env{'form.condition'} information, plus the
                    235: 'iterator_map' parameter if any.
1.51      bowersj2  236: 
1.416     jms       237: =item * B<iterator_map>: default: not used
1.51      bowersj2  238: 
1.416     jms       239: If you are letting the renderer do the iterator handling, you can
                    240: instruct the renderer to render only a particular map by passing it
                    241: the source of the map you want to process, like
                    242: '/res/103/jerf/navmap.course.sequence'.
1.51      bowersj2  243: 
1.416     jms       244: =item * B<include_top_level_map>: default: false
1.51      bowersj2  245: 
1.416     jms       246: If you need to include the top level map (meaning the course) in the
                    247: rendered output set this to true
1.51      bowersj2  248: 
1.416     jms       249: =item * B<navmap>: default: constructs one from %env
1.51      bowersj2  250: 
1.416     jms       251: A reference to a navmap, used only if an iterator is not passed in. If
                    252: this is necessary to make an iterator but it is not passed in, a new
                    253: one will be constructed based on env info. This is useful to do basic
                    254: error checking before passing it off to render.
1.51      bowersj2  255: 
1.416     jms       256: =item * B<r>: default: must be passed in
1.53      bowersj2  257: 
1.416     jms       258: The standard Apache response object. This must be passed to the
                    259: renderer or the course hash will be locked.
1.53      bowersj2  260: 
1.416     jms       261: =item * B<cols>: default: empty (useless)
1.407     raeburn   262: 
1.416     jms       263: An array reference
1.53      bowersj2  264: 
1.416     jms       265: =item * B<showParts>:default true
1.115     bowersj2  266: 
1.416     jms       267: A flag. If true, a line for the resource itself, and a line
                    268: for each part will be displayed. If not, only one line for each
                    269: resource will be displayed.
1.115     bowersj2  270: 
1.416     jms       271: =item * B<condenseParts>: default true
1.115     bowersj2  272: 
1.416     jms       273: A flag. If true, if all parts of the problem have the same
                    274: status and that status is Nothing Set, Correct, or Network Failure,
                    275: then only one line will be displayed for that resource anyhow. If no,
                    276: all parts will always be displayed. If showParts is 0, this is
                    277: ignored.
1.115     bowersj2  278: 
1.416     jms       279: =item * B<jumpCount>: default: determined from %env
1.115     bowersj2  280: 
1.416     jms       281: A string identifying the URL to place the anchor 'curloc' at.
                    282: It is the responsibility of the renderer user to
                    283: ensure that the #curloc is in the URL. By default, determined through
                    284: the use of the env{} 'jump' information, and should normally "just
                    285: work" correctly.
1.177     www       286: 
1.416     jms       287: =item * B<here>: default: empty string
1.68      bowersj2  288: 
1.416     jms       289: A Symb identifying where to place the 'here' marker. The empty
                    290: string means no marker.
1.73      bowersj2  291: 
1.416     jms       292: =item * B<indentString>: default: 25 pixel whitespace image
1.347     www       293: 
1.416     jms       294: A string identifying the indentation string to use. 
1.347     www       295: 
1.416     jms       296: =item * B<queryString>: default: empty
1.346     foxr      297: 
1.416     jms       298: A string which will be prepended to the query string used when the
                    299: folders are opened or closed. You can use this to pass
                    300: application-specific values.
1.73      bowersj2  301: 
1.416     jms       302: =item * B<url>: default: none
1.73      bowersj2  303: 
1.416     jms       304: The url the folders will link to, which should be the current
                    305: page. Required if the resource info column is shown, and you 
                    306: are allowing the user to open and close folders.
1.73      bowersj2  307: 
1.416     jms       308: =item * B<currentJumpIndex>: default: no jumping
1.73      bowersj2  309: 
1.416     jms       310: Describes the currently-open row number to cause the browser to jump
                    311: to, because the user just opened that folder. By default, pulled from
                    312: the Jump information in the env{'form.*'}.
1.73      bowersj2  313: 
1.416     jms       314: =item * B<printKey>: default: false
1.101     bowersj2  315: 
1.416     jms       316: If true, print the key that appears on the top of the standard
                    317: navmaps.
1.73      bowersj2  318: 
1.416     jms       319: =item * B<printCloseAll>: default: true
1.73      bowersj2  320: 
1.416     jms       321: If true, print the "Close all folders" or "open all folders"
                    322: links.
1.403     albertel  323: 
1.416     jms       324: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
1.346     foxr      325: 
1.416     jms       326: A function that takes the resource object as its only parameter and
                    327: returns a true or false value. If true, the resource is displayed. If
                    328: false, it is simply skipped in the display.
1.346     foxr      329: 
1.416     jms       330: =item * B<suppressEmptySequences>: default: false
1.346     foxr      331: 
1.416     jms       332: If you're using a filter function, and displaying sequences to orient
                    333: the user, then frequently some sequences will be empty. Setting this to
                    334: true will cause those sequences not to display, so as not to confuse the
                    335: user into thinking that if the sequence is there there should be things
                    336: under it; for example, see the "Show Uncompleted Homework" view on the
                    337: B<NAV> screen.
1.73      bowersj2  338: 
1.416     jms       339: =item * B<suppressNavmaps>: default: false
1.53      bowersj2  340: 
1.416     jms       341: If true, will not display Navigate Content resources. 
1.51      bowersj2  342: 
1.416     jms       343: =back
1.133     bowersj2  344: 
1.416     jms       345: =head2 Additional Info
1.174     albertel  346: 
1.416     jms       347: In addition to the parameters you can pass to the renderer, which will
                    348: be passed through unchange to the column renderers, the renderer will
                    349: generate the following information which your renderer may find
                    350: useful:
1.174     albertel  351: 
1.416     jms       352: =over 4
1.174     albertel  353: 
1.416     jms       354: =item * B<counter>: 
1.133     bowersj2  355: 
1.416     jms       356: Contains the number of rows printed. Useful after calling the render 
                    357: function, as you can detect whether anything was printed at all.
1.216     bowersj2  358: 
1.416     jms       359: =item * B<isNewBranch>:
1.216     bowersj2  360: 
1.416     jms       361: Useful for renderers: If this resource is currently the first resource
                    362: of a new branch, this will be true. The Resource column (leftmost in the
                    363: navmaps screen) uses this to display the "new branch" icon 
1.216     bowersj2  364: 
1.416     jms       365: =back
1.216     bowersj2  366: 
1.416     jms       367: =cut
1.216     bowersj2  368: 
                    369: 
1.416     jms       370: =head1 SUBROUTINES
1.216     bowersj2  371: 
1.416     jms       372: =over
1.216     bowersj2  373: 
1.416     jms       374: =item update()
1.133     bowersj2  375: 
1.416     jms       376: =item addToFilter()
1.133     bowersj2  377: 
1.416     jms       378: Convenience functions: Returns a string that adds or subtracts
                    379: the second argument from the first hash, appropriate for the 
                    380: query string that determines which folders to recurse on
1.174     albertel  381: 
1.416     jms       382: =item removeFromFilter()
1.51      bowersj2  383: 
1.416     jms       384: =item getLinkForResource()
1.51      bowersj2  385: 
1.416     jms       386: Convenience function: Given a stack returned from getStack on the iterator,
                    387: return the correct src() value.
1.174     albertel  388: 
1.416     jms       389: =item getDescription()
1.174     albertel  390: 
1.416     jms       391: Convenience function: This separates the logic of how to create
                    392: the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
                    393: etc.) into a separate function. It takes a resource object as the
                    394: first parameter, and the part number of the resource as the second.
                    395: It's basically a big switch statement on the status of the resource.
1.174     albertel  396: 
1.416     jms       397: =item dueInLessThan24Hours()
1.216     bowersj2  398: 
1.416     jms       399: Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
1.51      bowersj2  400: 
1.416     jms       401: =item lastTry()
1.51      bowersj2  402: 
1.416     jms       403: Convenience function, so others can use it: Is there only one try remaining for the
                    404: part, with more than one try to begin with, not due yet and still can be done?
1.51      bowersj2  405: 
1.416     jms       406: =item advancedUser()
1.51      bowersj2  407: 
1.416     jms       408: This puts a human-readable name on the env variable.
1.51      bowersj2  409: 
1.416     jms       410: =item timeToHumanString()
1.51      bowersj2  411: 
1.416     jms       412: timeToHumanString takes a time number and converts it to a
                    413: human-readable representation, meant to be used in the following
                    414: manner:
1.174     albertel  415: 
1.416     jms       416: =over 4
1.51      bowersj2  417: 
1.416     jms       418: =item * print "Due $timestring"
1.133     bowersj2  419: 
1.416     jms       420: =item * print "Open $timestring"
1.133     bowersj2  421: 
1.416     jms       422: =item * print "Answer available $timestring"
1.144     bowersj2  423: 
1.133     bowersj2  424: =back
1.51      bowersj2  425: 
1.416     jms       426: Very, very, very, VERY English-only... goodness help a localizer on
                    427: this func...
1.174     albertel  428: 
1.417     jms       429: =item resource()
1.174     albertel  430: 
1.417     jms       431: returns 0
1.51      bowersj2  432: 
1.417     jms       433: =item communication_status()
1.51      bowersj2  434: 
1.417     jms       435: returns 1
1.174     albertel  436: 
1.417     jms       437: =item quick_status()
1.51      bowersj2  438: 
1.417     jms       439: returns 2
1.225     bowersj2  440: 
1.417     jms       441: =item long_status()
1.225     bowersj2  442: 
1.417     jms       443: returns 3
1.225     bowersj2  444: 
1.417     jms       445: =item part_status_summary()
1.51      bowersj2  446: 
1.417     jms       447: returns 4
1.51      bowersj2  448: 
1.417     jms       449: =item render_resource()
1.51      bowersj2  450: 
1.417     jms       451: =item render_communication_status()
1.51      bowersj2  452: 
1.417     jms       453: =item render_quick_status()
                    454: 
                    455: =item render_long_status()
                    456: 
                    457: =item render_parts_summary_status()
                    458: 
                    459: =item setDefault()
                    460: 
                    461: =item cmp_title()
                    462: 
                    463: =item render()
                    464: 
                    465: =item add_linkitem()
                    466: 
                    467: =item show_linkitems()
1.130     www       468: 
1.416     jms       469: =back
1.115     bowersj2  470: 
1.416     jms       471: =cut
1.140     bowersj2  472: 
1.416     jms       473: package Apache::lonnavmaps;
1.51      bowersj2  474: 
1.416     jms       475: use strict;
                    476: use GDBM_File;
                    477: use Apache::loncommon();
                    478: use Apache::lonenc();
                    479: use Apache::lonlocal;
                    480: use Apache::lonnet;
                    481: use POSIX qw (floor strftime);
                    482: use Time::HiRes qw( gettimeofday tv_interval );
                    483: use LONCAPA;
                    484: use DateTime();
1.174     albertel  485: 
1.416     jms       486: # symbolic constants
                    487: sub SYMB { return 1; }
                    488: sub URL { return 2; }
                    489: sub NOTHING { return 3; }
1.174     albertel  490: 
1.416     jms       491: # Some data
1.174     albertel  492: 
1.416     jms       493: my $resObj = "Apache::lonnavmaps::resource";
1.174     albertel  494: 
1.416     jms       495: # Keep these mappings in sync with lonquickgrades, which uses the colors
                    496: # instead of the icons.
                    497: my %statusIconMap = 
                    498:     (
                    499:      $resObj->CLOSED       => '',
                    500:      $resObj->OPEN         => 'navmap.open.gif',
                    501:      $resObj->CORRECT      => 'navmap.correct.gif',
                    502:      $resObj->PARTIALLY_CORRECT      => 'navmap.partial.gif',
                    503:      $resObj->INCORRECT    => 'navmap.wrong.gif',
                    504:      $resObj->ATTEMPTED    => 'navmap.ellipsis.gif',
                    505:      $resObj->ERROR        => ''
                    506:      );
1.401     albertel  507: 
1.438     wenzelju  508: my %iconAltTags =   #texthash does not work here
1.439     wenzelju  509:     ( 'navmap.correct.gif'  => 'Correct',
                    510:       'navmap.wrong.gif'    => 'Incorrect',
                    511:       'navmap.open.gif'     => 'Open',
                    512:       'navmap.partial.gif'  => 'Partially Correct',
                    513:       'navmap.ellipsis.gif' => 'Attempted',
                    514:      );
1.401     albertel  515: 
1.416     jms       516: # Defines a status->color mapping, null string means don't color
                    517: my %colormap = 
                    518:     ( $resObj->NETWORK_FAILURE        => '',
                    519:       $resObj->CORRECT                => '',
                    520:       $resObj->EXCUSED                => '#3333FF',
                    521:       $resObj->PAST_DUE_ANSWER_LATER  => '',
                    522:       $resObj->PAST_DUE_NO_ANSWER     => '',
                    523:       $resObj->ANSWER_OPEN            => '#006600',
                    524:       $resObj->OPEN_LATER             => '',
                    525:       $resObj->TRIES_LEFT             => '',
                    526:       $resObj->INCORRECT              => '',
                    527:       $resObj->OPEN                   => '',
                    528:       $resObj->NOTHING_SET            => '',
                    529:       $resObj->ATTEMPTED              => '',
                    530:       $resObj->ANSWER_SUBMITTED       => '',
                    531:       $resObj->PARTIALLY_CORRECT      => '#006600'
                    532:       );
                    533: # And a special case in the nav map; what to do when the assignment
                    534: # is not yet done and due in less than 24 hours
                    535: my $hurryUpColor = "#FF0000";
1.174     albertel  536: 
1.432     raeburn   537: my $future_slots_checked = 0;
                    538: my $future_slots = 0;
                    539: 
1.416     jms       540: sub close {
                    541:     if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
                    542:     return(<<ENDCLOSE);
                    543: <script type="text/javascript">
                    544: window.status='Accessing Nav Control';
                    545: menu=window.open("/adm/rat/empty.html","loncapanav",
                    546:                  "height=600,width=400,scrollbars=1");
                    547: window.status='Closing Nav Control';
                    548: menu.close();
                    549: window.status='Done.';
                    550: </script>
                    551: ENDCLOSE
                    552: }
1.174     albertel  553: 
1.416     jms       554: sub update {
                    555:     if ($env{'environment.remotenavmap'} ne 'on') { return ''; }
                    556:     if (!$env{'request.course.id'}) { return ''; }
                    557:     if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
                    558:     return(<<ENDUPDATE);
                    559: <form name="navform"></form>
                    560: <script type="text/javascript">
                    561: this.document.navform.action='/adm/navmaps#curloc';
                    562: this.document.navform.target='loncapanav';
                    563: this.document.navform.submit();
                    564: </script>
                    565: ENDUPDATE
                    566: }
1.174     albertel  567: 
1.417     jms       568: 
1.416     jms       569: sub addToFilter {
                    570:     my $hashIn = shift;
                    571:     my $addition = shift;
                    572:     my %hash = %$hashIn;
                    573:     $hash{$addition} = 1;
1.174     albertel  574: 
1.416     jms       575:     return join (",", keys(%hash));
                    576: }
1.174     albertel  577: 
1.416     jms       578: sub removeFromFilter {
                    579:     my $hashIn = shift;
                    580:     my $subtraction = shift;
                    581:     my %hash = %$hashIn;
1.174     albertel  582: 
1.416     jms       583:     delete $hash{$subtraction};
                    584:     return join(",", keys(%hash));
                    585: }
1.174     albertel  586: 
1.416     jms       587: sub getLinkForResource {
                    588:     my $stack = shift;
                    589:     my $res;
1.174     albertel  590: 
1.416     jms       591:     # Check to see if there are any pages in the stack
                    592:     foreach $res (@$stack) {
                    593:         if (defined($res)) {
                    594: 	    my $anchor;
                    595: 	    if ($res->is_page()) {
                    596: 		foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; }  }
                    597: 		$anchor=&escape($anchor->shown_symb());
                    598: 		return ($res->link(),$res->shown_symb(),$anchor);
                    599: 	    }
                    600:             # in case folder was skipped over as "only sequence"
                    601: 	    my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
                    602: 	    if ($map=~/\.page$/) {
                    603: 		my $url=&Apache::lonnet::clutter($map);
1.437     foxr      604: 		$anchor=&escape($res->shown_symb());
1.416     jms       605: 		return ($url,$res->shown_symb(),$anchor);
                    606: 	    }
                    607:         }
                    608:     }
1.174     albertel  609: 
1.416     jms       610:     # Failing that, return the src of the last resource that is defined
                    611:     # (when we first recurse on a map, it puts an undefined resource
                    612:     # on the bottom because $self->{HERE} isn't defined yet, and we
                    613:     # want the src for the map anyhow)
                    614:     foreach my $item (@$stack) {
                    615:         if (defined($item)) { $res = $item; }
                    616:     }
1.174     albertel  617: 
1.416     jms       618:     if ($res) {
                    619: 	return ($res->link(),$res->shown_symb());
                    620:     }
                    621:     return;
                    622: }
1.174     albertel  623: 
1.417     jms       624: 
1.140     bowersj2  625: 
1.416     jms       626: sub getDescription {
                    627:     my $res = shift;
                    628:     my $part = shift;
                    629:     my $status = $res->status($part);
1.92      bowersj2  630: 
1.416     jms       631:     my $open = $res->opendate($part);
                    632:     my $due = $res->duedate($part);
                    633:     my $answer = $res->answerdate($part);
1.164     bowersj2  634: 
1.416     jms       635:     if ($status == $res->NETWORK_FAILURE) { 
                    636:         return &mt("Having technical difficulties; please check status later"); 
                    637:     }
                    638:     if ($status == $res->NOTHING_SET) {
                    639:         return &mt("Not currently assigned.");
                    640:     }
                    641:     if ($status == $res->OPEN_LATER) {
                    642:         return &mt("Open ") .timeToHumanString($open,'start');
                    643:     }
1.432     raeburn   644:     if ($res->simpleStatus($part) == $res->OPEN) {
                    645:         unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
                    646:             my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
                    647:             if ($slot_status == $res->UNKNOWN) {
                    648:                 return &mt('Reservation status unknown');
                    649:             } elsif ($slot_status == $res->RESERVED) {
1.433     bisitz    650:                 return &mt('Reserved - ends [_1]',
                    651:                            timeToHumanString($slot_time,'end'));
1.432     raeburn   652:             } elsif ($slot_status == $res->RESERVED_LOCATION) {
1.433     bisitz    653:                 return &mt('Reserved - specific location(s) - ends [_1]',
                    654:                            timeToHumanString($slot_time,'end'));
1.432     raeburn   655:             } elsif ($slot_status == $res->RESERVED_LATER) {
1.433     bisitz    656:                 return &mt('Reserved - next open [_1]',
                    657:                            timeToHumanString($slot_time,'start'));
1.432     raeburn   658:             } elsif ($slot_status == $res->RESERVABLE) {
1.433     bisitz    659:                 return &mt('Reservable ending [_1]',
                    660:                            timeToHumanString($slot_time,'end'));
1.432     raeburn   661:             } elsif ($slot_status == $res->RESERVABLE_LATER) {
1.433     bisitz    662:                 return &mt('Reservable starting [_1]',
                    663:                            timeToHumanString($slot_time,'start'));
1.432     raeburn   664:             } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
                    665:                 return &mt('Reserve a time/place to work');
                    666:             } elsif ($slot_status == $res->NOTRESERVABLE) {
                    667:                 return &mt('Reservation not available');
                    668:             } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
                    669:                 return &mt('Submission in grading queue');
                    670:             }
                    671:         }
                    672:     }
1.416     jms       673:     if ($status == $res->OPEN) {
                    674:         if ($due) {
                    675: 	    if ($res->is_practice()) {
                    676: 		return &mt("Closes ")."  " .timeToHumanString($due,'start');
                    677: 	    } else {
                    678: 		return &mt("Due")."  " .timeToHumanString($due,'end');
                    679: 	    }
                    680:         } else {
                    681:             return &mt("Open, no due date");
                    682:         }
                    683:     }
                    684:     if ($status == $res->PAST_DUE_ANSWER_LATER) {
                    685:         return &mt("Answer open")." " .timeToHumanString($answer,'start');
                    686:     }
                    687:     if ($status == $res->PAST_DUE_NO_ANSWER) {
                    688: 	if ($res->is_practice()) {
                    689: 	    return &mt("Closed")." " . timeToHumanString($due,'start');
                    690: 	} else {
                    691: 	    return &mt("Was due")." " . timeToHumanString($due,'end');
                    692: 	}
                    693:     }
                    694:     if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
                    695: 	&& $res->handgrade($part) ne 'yes') {
                    696:         return &mt("Answer available");
                    697:     }
                    698:     if ($status == $res->EXCUSED) {
                    699:         return &mt("Excused by instructor");
                    700:     }
                    701:     if ($status == $res->ATTEMPTED) {
                    702:         return &mt("Answer submitted, not yet graded");
                    703:     }
                    704:     if ($status == $res->TRIES_LEFT) {
                    705:         my $tries = $res->tries($part);
                    706:         my $maxtries = $res->maxtries($part);
                    707:         my $triesString = "";
                    708:         if ($tries && $maxtries) {
1.422     raeburn   709:             $triesString = '<font size="-1"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></font>';
1.416     jms       710:             if ($maxtries > 1 && $maxtries - $tries == 1) {
                    711:                 $triesString = "<b>$triesString</b>";
                    712:             }
                    713:         }
                    714:         if ($due) {
                    715:             return &mt("Due")." " . timeToHumanString($due,'end') .
                    716:                 " $triesString";
                    717:         } else {
                    718:             return &mt("No due date")." $triesString";
                    719:         }
                    720:     }
                    721:     if ($status == $res->ANSWER_SUBMITTED) {
                    722:         return &mt('Answer submitted');
                    723:     }
                    724: }
1.92      bowersj2  725: 
1.51      bowersj2  726: 
1.416     jms       727: sub dueInLessThan24Hours {
                    728:     my $res = shift;
                    729:     my $part = shift;
                    730:     my $status = $res->status($part);
1.55      bowersj2  731: 
1.416     jms       732:     return ($status == $res->OPEN() ||
                    733:             $status == $res->TRIES_LEFT()) &&
                    734: 	    $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
                    735: 	    $res->duedate($part) > time();
                    736: }
1.84      bowersj2  737: 
1.417     jms       738: 
1.416     jms       739: sub lastTry {
                    740:     my $res = shift;
                    741:     my $part = shift;
1.115     bowersj2  742: 
1.416     jms       743:     my $tries = $res->tries($part);
                    744:     my $maxtries = $res->maxtries($part);
                    745:     return $tries && $maxtries && $maxtries > 1 &&
                    746:         $maxtries - $tries == 1 && $res->duedate($part) &&
                    747:         $res->duedate($part) > time();
                    748: }
1.55      bowersj2  749: 
1.51      bowersj2  750: 
1.416     jms       751: sub advancedUser {
                    752:     return $env{'request.role.adv'};
                    753: }
1.51      bowersj2  754: 
1.416     jms       755: sub timeToHumanString {
                    756:     my ($time,$type,$format) = @_;
1.153     bowersj2  757: 
1.416     jms       758:     # zero, '0' and blank are bad times
                    759:     if (!$time) {
                    760:         return &mt('never');
                    761:     }
                    762:     unless (&Apache::lonlocal::current_language()=~/^en/) {
                    763: 	return &Apache::lonlocal::locallocaltime($time);
                    764:     } 
                    765:     my $now = time();
1.174     albertel  766: 
1.416     jms       767:     # Positive = future
                    768:     my $delta = $time - $now;
1.190     bowersj2  769: 
1.416     jms       770:     my $minute = 60;
                    771:     my $hour = 60 * $minute;
                    772:     my $day = 24 * $hour;
                    773:     my $week = 7 * $day;
                    774:     my $inPast = 0;
1.190     bowersj2  775: 
1.416     jms       776:     # Logic in comments:
                    777:     # Is it now? (extremely unlikely)
                    778:     if ( $delta == 0 ) {
                    779:         return "this instant";
                    780:     }
1.174     albertel  781: 
1.416     jms       782:     if ($delta < 0) {
                    783:         $inPast = 1;
                    784:         $delta = -$delta;
                    785:     }
1.143     bowersj2  786: 
1.416     jms       787:     if ( $delta > 0 ) {
1.51      bowersj2  788: 
1.416     jms       789:         my $tense = $inPast ? " ago" : "";
                    790:         my $prefix = $inPast ? "" : "in ";
                    791:         
                    792:         # Less than a minute
                    793:         if ( $delta < $minute ) {
                    794:             if ($delta == 1) { return "${prefix}1 second$tense"; }
                    795:             return "$prefix$delta seconds$tense";
                    796:         }
1.51      bowersj2  797: 
1.416     jms       798:         # Less than an hour
                    799:         if ( $delta < $hour ) {
                    800:             # If so, use minutes
                    801:             my $minutes = floor($delta / 60);
                    802:             if ($minutes == 1) { return "${prefix}1 minute$tense"; }
                    803:             return "$prefix$minutes minutes$tense";
                    804:         }
                    805:         
                    806:         # Is it less than 24 hours away? If so,
                    807:         # display hours + minutes
                    808:         if ( $delta < $hour * 24) {
                    809:             my $hours = floor($delta / $hour);
                    810:             my $minutes = floor(($delta % $hour) / $minute);
                    811:             my $hourString = "$hours hours";
                    812:             my $minuteString = ", $minutes minutes";
                    813:             if ($hours == 1) {
                    814:                 $hourString = "1 hour";
                    815:             }
                    816:             if ($minutes == 1) {
                    817:                 $minuteString = ", 1 minute";
                    818:             }
                    819:             if ($minutes == 0) {
                    820:                 $minuteString = "";
                    821:             }
                    822:             return "$prefix$hourString$minuteString$tense";
                    823:         }
1.174     albertel  824: 
1.416     jms       825: 	my $dt = DateTime->from_epoch(epoch => $time)
                    826: 	                 ->set_time_zone(&Apache::lonlocal::gettimezone());
1.216     bowersj2  827: 
1.416     jms       828: 	# If there's a caller supplied format, use it.
1.145     bowersj2  829: 
1.416     jms       830: 	if ($format ne '') {
                    831: 	    my $timeStr = $dt->strftime($format);
                    832: 	    return $timeStr.' ('.$dt->time_zone_short_name().')';
                    833: 	}
1.216     bowersj2  834: 
1.416     jms       835:         # Less than 5 days away, display day of the week and
                    836:         # HH:MM
1.216     bowersj2  837: 
1.416     jms       838:         if ( $delta < $day * 5 ) {
                    839:             my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
                    840:             $timeStr =~ s/12:00 am/00:00/;
                    841:             $timeStr =~ s/12:00 pm/noon/;
                    842:             return ($inPast ? "last " : "this ") .
                    843:                 $timeStr;
                    844:         }
                    845:         
                    846: 	my $conjunction='on';
                    847: 	if ($type eq 'start') {
                    848: 	    $conjunction='at';
                    849: 	} elsif ($type eq 'end') {
                    850: 	    $conjunction='by';
                    851: 	}
                    852:         # Is it this year?
                    853: 	my $dt_now = DateTime->from_epoch(epoch => $now)
                    854: 	                     ->set_time_zone(&Apache::lonlocal::gettimezone());
                    855:         if ( $dt->year() == $dt_now->year()) {
                    856:             # Return on Month Day, HH:MM meridian
                    857:             my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
                    858:             $timeStr =~ s/12:00 am/00:00/;
                    859:             $timeStr =~ s/12:00 pm/noon/;
                    860:             return $timeStr;
                    861:         }
1.59      bowersj2  862: 
1.416     jms       863:         # Not this year, so show the year
                    864:         my $timeStr = 
                    865: 	    $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
                    866:         $timeStr =~ s/12:00 am/00:00/;
                    867:         $timeStr =~ s/12:00 pm/noon/;
                    868:         return $timeStr;
                    869:     }
                    870: }
1.59      bowersj2  871: 
                    872: 
1.133     bowersj2  873: sub resource { return 0; }
                    874: sub communication_status { return 1; }
                    875: sub quick_status { return 2; }
                    876: sub long_status { return 3; }
1.225     bowersj2  877: sub part_status_summary { return 4; }
1.51      bowersj2  878: 
1.133     bowersj2  879: sub render_resource {
                    880:     my ($resource, $part, $params) = @_;
1.51      bowersj2  881: 
1.133     bowersj2  882:     my $nonLinkedText = ''; # stuff after resource title not in link
1.51      bowersj2  883: 
1.134     bowersj2  884:     my $link = $params->{"resourceLink"};
1.306     foxr      885: 
                    886:     #  The URL part is not escaped at this point, but the symb is... 
                    887: 
1.134     bowersj2  888:     my $src = $resource->src();
                    889:     my $it = $params->{"iterator"};
1.133     bowersj2  890:     my $filter = $it->{FILTER};
                    891: 
                    892:     my $title = $resource->compTitle();
1.258     albertel  893: 
1.133     bowersj2  894:     my $partLabel = "";
                    895:     my $newBranchText = "";
1.298     albertel  896:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1.133     bowersj2  897:     # If this is a new branch, label it so
                    898:     if ($params->{'isNewBranch'}) {
1.429     droeschl  899:         $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
1.51      bowersj2  900:     }
                    901: 
1.133     bowersj2  902:     # links to open and close the folder
1.306     foxr      903: 
1.427     droeschl  904:     my $whitespace = $location.'/whitespace_21.gif';
                    905:     my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
1.133     bowersj2  906:     my $linkclose = "</a>";
1.51      bowersj2  907: 
1.204     albertel  908:     # Default icon: unknown page
1.426     droeschl  909:     my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
1.133     bowersj2  910:     
                    911:     if ($resource->is_problem()) {
1.192     bowersj2  912:         if ($part eq '0' || $params->{'condensed'}) {
1.426     droeschl  913: 	    $icon = '<img class="LC_contentImage" src="'.$location.'/';
1.389     albertel  914: 	    if ($resource->is_task()) {
                    915: 		$icon .= 'task.gif" alt="'.&mt('Task');
                    916: 	    } else {
                    917: 		$icon .= 'problem.gif" alt="'.&mt('Problem');
                    918: 	    }
1.426     droeschl  919: 	    $icon .='" />';
1.133     bowersj2  920:         } else {
                    921:             $icon = $params->{'indentString'};
                    922:         }
1.204     albertel  923:     } else {
1.426     droeschl  924: 	$icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
1.133     bowersj2  925:     }
1.51      bowersj2  926: 
1.133     bowersj2  927:     # Display the correct map icon to open or shut map
                    928:     if ($resource->is_map()) {
                    929:         my $mapId = $resource->map_pc();
                    930:         my $nowOpen = !defined($filter->{$mapId});
                    931:         if ($it->{CONDITION}) {
                    932:             $nowOpen = !$nowOpen;
                    933:         }
1.426     droeschl  934: 	
1.205     bowersj2  935: 	my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1.362     www       936:         my $title=$resource->title;
1.426     droeschl  937: 		$title=~s/\"/\&qout;/g;
1.144     bowersj2  938:         if (!$params->{'resource_no_folder_link'}) {
1.205     bowersj2  939:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.426     droeschl  940:             $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
                    941:                     ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
                    942:                     .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";			
1.349     foxr      943:             $linkopen = "<a href=\"" . $params->{'url'} . '?' . 
1.392     albertel  944:                 $params->{'queryString'} . '&amp;filter=';
1.144     bowersj2  945:             $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
                    946:                 addToFilter($filter, $mapId) :
                    947:                 removeFromFilter($filter, $mapId);
1.392     albertel  948:             $linkopen .= "&amp;condition=" . $it->{CONDITION} . '&amp;hereType='
                    949:                 . $params->{'hereType'} . '&amp;here=' .
1.384     www       950:                 &escape($params->{'here'}) . 
1.392     albertel  951:                 '&amp;jump=' .
1.384     www       952:                 &escape($resource->symb()) . 
1.392     albertel  953:                 "&amp;folderManip=1\">";
1.306     foxr      954: 
1.144     bowersj2  955:         } else {
                    956:             # Don't allow users to manipulate folder
1.426     droeschl  957:             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1.427     droeschl  958:             $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
1.144     bowersj2  959: 
                    960:             $linkopen = "";
                    961:             $linkclose = "";
                    962:         }
1.133     bowersj2  963:     }
1.51      bowersj2  964: 
1.133     bowersj2  965:     if ($resource->randomout()) {
1.362     www       966:         $nonLinkedText .= ' <i>('.&mt('hidden').')</i> ';
1.133     bowersj2  967:     }
1.342     albertel  968:     if (!$resource->condval()) {
1.362     www       969:         $nonLinkedText .= ' <i>('.&mt('conditionally hidden').')</i> ';
1.342     albertel  970:     }
1.413     www       971:     if (($resource->is_practice()) && ($resource->is_raw_problem())) {
1.412     www       972:         $nonLinkedText .=' <font color="green"><b>'.&mt('not graded').'</b></font>';
                    973:     }
1.426     droeschl  974: 
1.133     bowersj2  975:     # We're done preparing and finally ready to start the rendering
1.426     droeschl  976:     my $result = '<td class="LC_middle">';
                    977:     my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
                    978: 	
1.140     bowersj2  979:     my $indentLevel = $params->{'indentLevel'};
                    980:     if ($newBranchText) { $indentLevel--; }
                    981: 
1.133     bowersj2  982:     # print indentation
1.140     bowersj2  983:     for (my $i = 0; $i < $indentLevel; $i++) {
1.133     bowersj2  984:         $result .= $params->{'indentString'};
1.84      bowersj2  985:     }
                    986: 
1.133     bowersj2  987:     # Decide what to display
                    988:     $result .= "$newBranchText$linkopen$icon$linkclose";
                    989:     
                    990:     my $curMarkerBegin = '';
                    991:     my $curMarkerEnd = '';
1.51      bowersj2  992: 
1.133     bowersj2  993:     # Is this the current resource?
1.158     bowersj2  994:     if (!$params->{'displayedHereMarker'} && 
                    995:         $resource->symb() eq $params->{'here'} ) {
1.430     schulted  996:         $curMarkerBegin = '<em>';
1.424     schulted  997:         $curMarkerEnd = '</em>';
                    998: 	$params->{'displayedHereMarker'} = 1;
1.51      bowersj2  999:     }
                   1000: 
1.192     bowersj2 1001:     if ($resource->is_problem() && $part ne '0' && 
1.133     bowersj2 1002:         !$params->{'condensed'}) {
1.274     matthew  1003: 	my $displaypart=$resource->part_display($part);
1.363     albertel 1004:         $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1.384     www      1005: 	if ($link!~/\#/) { $link.='#'.&escape($part); }
1.133     bowersj2 1006:         $title = "";
1.51      bowersj2 1007:     }
                   1008: 
1.163     bowersj2 1009:     if ($params->{'condensed'} && $resource->countParts() > 1) {
1.363     albertel 1010:         $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1.51      bowersj2 1011:     }
                   1012: 
1.268     albertel 1013:     my $target;
1.320     albertel 1014:     if ($env{'environment.remotenavmap'} eq 'on') {
1.268     albertel 1015: 	$target=' target="loncapaclient" ';
                   1016:     }
1.266     raeburn  1017:     if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1.426     droeschl 1018:         $result .= "$curMarkerBegin<a $target href=\"$link\">$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1.144     bowersj2 1019:     } else {
1.426     droeschl 1020:         $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1.144     bowersj2 1021:     }
1.51      bowersj2 1022: 
1.133     bowersj2 1023:     return $result;
                   1024: }
1.51      bowersj2 1025: 
1.133     bowersj2 1026: sub render_communication_status {
                   1027:     my ($resource, $part, $params) = @_;
1.134     bowersj2 1028:     my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
                   1029: 
                   1030:     my $link = $params->{"resourceLink"};
1.335     albertel 1031:     my $target;
                   1032:     if ($env{'environment.remotenavmap'} eq 'on') {
                   1033: 	$target=' target="loncapaclient" ';
                   1034:     }
1.349     foxr     1035:     my $linkopen = "<a $target href=\"$link\">";
1.134     bowersj2 1036:     my $linkclose = "</a>";
1.298     albertel 1037:     my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.134     bowersj2 1038:     if ($resource->hasDiscussion()) {
                   1039:         $discussionHTML = $linkopen .
1.426     droeschl 1040:             '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" />' .
1.134     bowersj2 1041:             $linkclose;
                   1042:     }
                   1043:     
                   1044:     if ($resource->getFeedback()) {
                   1045:         my $feedback = $resource->getFeedback();
1.394     raeburn  1046:         foreach my $msgid (split(/\,/, $feedback)) {
                   1047:             if ($msgid) {
1.335     albertel 1048:                 $feedbackHTML .= '&nbsp;<a '.$target.' href="/adm/email?display='
1.394     raeburn  1049:                     . &escape($msgid) . '">'
1.426     droeschl 1050:                     . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" /></a>';
1.134     bowersj2 1051:             }
                   1052:         }
                   1053:     }
                   1054:     
                   1055:     if ($resource->getErrors()) {
                   1056:         my $errors = $resource->getErrors();
1.254     matthew  1057:         my $errorcount = 0;
1.394     raeburn  1058:         foreach my $msgid (split(/,/, $errors)) {
1.254     matthew  1059:             last if ($errorcount>=10); # Only output 10 bombs maximum
1.394     raeburn  1060:             if ($msgid) {
1.254     matthew  1061:                 $errorcount++;
1.335     albertel 1062:                 $errorHTML .= '&nbsp;<a '.$target.' href="/adm/email?display='
1.394     raeburn  1063:                     . &escape($msgid) . '">'
1.426     droeschl 1064:                     . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" /></a>';
1.134     bowersj2 1065:             }
                   1066:         }
1.197     bowersj2 1067:     }
                   1068: 
                   1069:     if ($params->{'multipart'} && $part != '0') {
                   1070: 	$discussionHTML = $feedbackHTML = $errorHTML = '';
1.134     bowersj2 1071:     }
1.426     droeschl 1072:     return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>";
1.134     bowersj2 1073: 
1.133     bowersj2 1074: }
                   1075: sub render_quick_status {
                   1076:     my ($resource, $part, $params) = @_;
1.135     bowersj2 1077:     my $result = "";
                   1078:     my $firstDisplayed = !$params->{'condensed'} && 
                   1079:         $params->{'multipart'} && $part eq "0";
                   1080: 
                   1081:     my $link = $params->{"resourceLink"};
1.335     albertel 1082:     my $target;
                   1083:     if ($env{'environment.remotenavmap'} eq 'on') {
                   1084: 	$target=' target="loncapaclient" ';
                   1085:     }
1.349     foxr     1086:     my $linkopen = "<a $target href=\"$link\">";
1.135     bowersj2 1087:     my $linkclose = "</a>";
1.426     droeschl 1088: 	
                   1089: 	$result .= '<td class="LC_middle">';
1.135     bowersj2 1090:     if ($resource->is_problem() &&
                   1091:         !$firstDisplayed) {
1.224     bowersj2 1092:         my $icon = $statusIconMap{$resource->simpleStatus($part)};
1.135     bowersj2 1093:         my $alt = $iconAltTags{$icon};
                   1094:         if ($icon) {
1.298     albertel 1095: 	    my $location=
                   1096: 		&Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1.438     wenzelju 1097: 		$result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;            
1.135     bowersj2 1098:         } else {
1.426     droeschl 1099:             $result .= "&nbsp;";
1.135     bowersj2 1100:         }
                   1101:     } else { # not problem, no icon
1.426     droeschl 1102:         $result .= "&nbsp;";
1.135     bowersj2 1103:     }
1.426     droeschl 1104: 	$result .= "</td>\n";
1.135     bowersj2 1105:     return $result;
1.133     bowersj2 1106: }
                   1107: sub render_long_status {
                   1108:     my ($resource, $part, $params) = @_;
1.426     droeschl 1109:     my $result = '<td class="LC_middle LC_right">';
1.136     bowersj2 1110:     my $firstDisplayed = !$params->{'condensed'} && 
                   1111:         $params->{'multipart'} && $part eq "0";
                   1112:                 
                   1113:     my $color;
1.402     albertel 1114:     if ($resource->is_problem() || $resource->is_practice()) {
1.136     bowersj2 1115:         $color = $colormap{$resource->status};
                   1116:         
1.252     matthew  1117:         if (dueInLessThan24Hours($resource, $part) ||
1.136     bowersj2 1118:             lastTry($resource, $part)) {
                   1119:             $color = $hurryUpColor;
                   1120:         }
                   1121:     }
                   1122:     
                   1123:     if ($resource->kind() eq "res" &&
1.402     albertel 1124:         ($resource->is_problem() || $resource->is_practice()) &&
1.136     bowersj2 1125:         !$firstDisplayed) {
                   1126:         if ($color) {$result .= "<font color=\"$color\"><b>"; }
                   1127:         $result .= getDescription($resource, $part);
                   1128:         if ($color) {$result .= "</b></font>"; }
                   1129:     }
1.402     albertel 1130:     if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1.400     albertel 1131:         $result .= &mt('(randomly select [_1])', $resource->randompick());
                   1132:     }
                   1133:     if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
                   1134:         $result .= &mt('(randomly ordered)');
1.136     bowersj2 1135:     }
1.210     bowersj2 1136: 
1.213     bowersj2 1137:     # Debugging code
                   1138:     #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
                   1139:     #	' - Part: ' . $part;
                   1140: 
1.210     bowersj2 1141:     $result .= "</td>\n";
1.136     bowersj2 1142:     
                   1143:     return $result;
1.51      bowersj2 1144: }
                   1145: 
1.227     bowersj2 1146: # Colors obtained by taking the icons, matching the colors, and
                   1147: # possibly reducing the Value (HSV) of the color, if it's too bright
                   1148: # for text, generally by one third or so.
1.225     bowersj2 1149: my %statusColors = 
                   1150:     (
                   1151:      $resObj->CLOSED => '#000000',
1.227     bowersj2 1152:      $resObj->OPEN   => '#998b13',
                   1153:      $resObj->CORRECT => '#26933f',
                   1154:      $resObj->INCORRECT => '#c48207',
                   1155:      $resObj->ATTEMPTED => '#a87510',
1.225     bowersj2 1156:      $resObj->ERROR => '#000000'
                   1157:      );
                   1158: my %statusStrings = 
                   1159:     (
                   1160:      $resObj->CLOSED => 'Not yet open',
                   1161:      $resObj->OPEN   => 'Open',
                   1162:      $resObj->CORRECT => 'Correct',
                   1163:      $resObj->INCORRECT => 'Incorrect',
                   1164:      $resObj->ATTEMPTED => 'Attempted',
                   1165:      $resObj->ERROR => 'Network Error'
                   1166:      );
                   1167: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
                   1168: 
                   1169: sub render_parts_summary_status {
                   1170:     my ($resource, $part, $params) = @_;
1.256     albertel 1171:     if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1.225     bowersj2 1172:     if ($params->{showParts}) { 
                   1173: 	return '<td></td>';
                   1174:     }
                   1175: 
                   1176:     my $td = "<td align='right'>\n";
                   1177:     my $endtd = "</td>\n";
1.256     albertel 1178:     my @probs;
1.225     bowersj2 1179: 
1.256     albertel 1180:     if ($resource->contains_problem) {
                   1181: 	@probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
                   1182:     } else {
                   1183: 	@probs=($resource);
                   1184:     }
                   1185:     my $return;
                   1186:     my %overallstatus;
                   1187:     my $totalParts;
                   1188:     foreach my $resource (@probs) {
                   1189: 	# If there is a single part, just show the simple status
                   1190: 	if ($resource->singlepart()) {
                   1191: 	    my $status = $resource->simpleStatus(${$resource->parts}[0]);
                   1192: 	    $overallstatus{$status}++;
                   1193: 	    $totalParts++;
                   1194: 	    next;
                   1195: 	}
                   1196: 	# Now we can be sure the $part doesn't really matter.
                   1197: 	my $statusCount = $resource->simpleStatusCount();
                   1198: 	my @counts;
                   1199: 	foreach my $status (@statuses) {
                   1200: 	    # decouple display order from the simpleStatusCount order
                   1201: 	    my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
                   1202: 	    if ($statusCount->[$slot]) {
                   1203: 		$overallstatus{$status}+=$statusCount->[$slot];
                   1204: 		$totalParts+=$statusCount->[$slot];
                   1205: 	    }
                   1206: 	}
                   1207:     }
                   1208:     $return.= $td . $totalParts . ' parts: ';
                   1209:     foreach my $status (@statuses) {
                   1210: 	if ($overallstatus{$status}) {
                   1211: 	    $return.="<font color='" . $statusColors{$status} .
                   1212: 		"'>" . $overallstatus{$status} . ' '
1.225     bowersj2 1213: 		. $statusStrings{$status} . "</font>";
                   1214: 	}
                   1215:     }
1.256     albertel 1216:     $return.= $endtd;
                   1217:     return $return;
1.225     bowersj2 1218: }
                   1219: 
1.133     bowersj2 1220: my @preparedColumns = (\&render_resource, \&render_communication_status,
1.225     bowersj2 1221:                        \&render_quick_status, \&render_long_status,
                   1222: 		       \&render_parts_summary_status);
1.132     bowersj2 1223: 
                   1224: sub setDefault {
                   1225:     my ($val, $default) = @_;
                   1226:     if (!defined($val)) { return $default; }
                   1227:     return $val;
                   1228: }
                   1229: 
1.296     albertel 1230: sub cmp_title {
                   1231:     my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
                   1232:     $atitle=~s/^\s*//;
                   1233:     $btitle=~s/^\s*//;
                   1234:     return $atitle cmp $btitle;
                   1235: }
                   1236: 
1.132     bowersj2 1237: sub render {
                   1238:     my $args = shift;
1.140     bowersj2 1239:     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
                   1240:     my $result = '';
1.132     bowersj2 1241:     # Configure the renderer.
                   1242:     my $cols = $args->{'cols'};
                   1243:     if (!defined($cols)) {
                   1244:         # no columns, no nav maps.
                   1245:         return '';
                   1246:     }
1.140     bowersj2 1247:     my $navmap;
                   1248:     if (defined($args->{'navmap'})) {
                   1249:         $navmap = $args->{'navmap'};
                   1250:     }
                   1251: 
1.158     bowersj2 1252:     my $r = $args->{'r'};
1.140     bowersj2 1253:     my $queryString = $args->{'queryString'};
1.159     bowersj2 1254:     my $jump = $args->{'jump'};
1.158     bowersj2 1255:     my $here = $args->{'here'};
1.153     bowersj2 1256:     my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.256     albertel 1257:     my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1.140     bowersj2 1258:     my $currentJumpDelta = 2; # change this to change how many resources are displayed
                   1259:                              # before the current resource when using #current
                   1260: 
                   1261:     # If we were passed 'here' information, we are not rendering
                   1262:     # after a folder manipulation, and we were not passed an
                   1263:     # iterator, make sure we open the folders to show the "here"
                   1264:     # marker
                   1265:     my $filterHash = {};
                   1266:     # Figure out what we're not displaying
1.394     raeburn  1267:     foreach my $item (split(/\,/, $env{"form.filter"})) {
                   1268:         if ($item) {
                   1269:             $filterHash->{$item} = "1";
1.140     bowersj2 1270:         }
                   1271:     }
                   1272: 
1.191     bowersj2 1273:     # Filter: Remember filter function and add our own filter: Refuse
                   1274:     # to show hidden resources unless the user can see them.
                   1275:     my $userCanSeeHidden = advancedUser();
                   1276:     my $filterFunc = setDefault($args->{'filterFunc'},
                   1277:                                 sub {return 1;});
                   1278:     if (!$userCanSeeHidden) {
                   1279:         # Without renaming the filterfunc, the server seems to go into
                   1280:         # an infinite loop
                   1281:         my $oldFilterFunc = $filterFunc;
                   1282:         $filterFunc = sub { my $res = shift; return !$res->randomout() && 
                   1283:                                 &$oldFilterFunc($res);};
                   1284:     }
                   1285: 
1.140     bowersj2 1286:     my $condition = 0;
1.320     albertel 1287:     if ($env{'form.condition'}) {
1.140     bowersj2 1288:         $condition = 1;
                   1289:     }
                   1290: 
1.320     albertel 1291:     if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1.140     bowersj2 1292:         # Step 1: Check to see if we have a navmap
                   1293:         if (!defined($navmap)) {
1.221     bowersj2 1294:             $navmap = Apache::lonnavmaps::navmap->new();
1.340     albertel 1295: 	    if (!defined($navmap)) {
1.423     raeburn  1296: 		# no longer in course
1.388     albertel 1297: 		return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1.362     www      1298:                         <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1.340     albertel 1299: 	    }
                   1300: 	}
1.140     bowersj2 1301: 
                   1302:         # Step two: Locate what kind of here marker is necessary
                   1303:         # Determine where the "here" marker is and where the screen jumps to.
                   1304: 
1.332     albertel 1305:         if ($env{'form.postsymb'} ne '') {
1.320     albertel 1306:             $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1.332     albertel 1307:         } elsif ($env{'form.postdata'} ne '') {
1.140     bowersj2 1308:             # couldn't find a symb, is there a URL?
1.320     albertel 1309:             my $currenturl = $env{'form.postdata'};
1.158     bowersj2 1310:             #$currenturl=~s/^http\:\/\///;
                   1311:             #$currenturl=~s/^[^\/]+//;
1.140     bowersj2 1312:             
1.158     bowersj2 1313:             $here = $jump = &Apache::lonnet::symbread($currenturl);
1.331     albertel 1314: 	}
                   1315: 	if ($here eq '') {
1.317     albertel 1316: 	    my $last;
1.320     albertel 1317: 	    if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1.317     albertel 1318:                     &GDBM_READER(),0640)) {
                   1319: 		$last=$hash{'last_known'};
                   1320: 		untie(%hash);
                   1321: 	    }
                   1322: 	    if ($last) { $here = $jump = $last; }
                   1323: 	}
1.158     bowersj2 1324: 
1.140     bowersj2 1325:         # Step three: Ensure the folders are open
                   1326:         my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1.222     bowersj2 1327:         my $curRes;
1.140     bowersj2 1328:         my $found = 0;
                   1329:         
                   1330:         # We only need to do this if we need to open the maps to show the
                   1331:         # current position. This will change the counter so we can't count
                   1332:         # for the jump marker with this loop.
1.294     albertel 1333:         while ($here && ($curRes = $mapIterator->next()) && !$found) {
1.158     bowersj2 1334:             if (ref($curRes) && $curRes->symb() eq $here) {
1.140     bowersj2 1335:                 my $mapStack = $mapIterator->getStack();
                   1336:                 
                   1337:                 # Ensure the parent maps are open
                   1338:                 for my $map (@{$mapStack}) {
                   1339:                     if ($condition) {
                   1340:                         undef $filterHash->{$map->map_pc()};
                   1341:                     } else {
                   1342:                         $filterHash->{$map->map_pc()} = 1;
                   1343:                     }
                   1344:                 }
                   1345:                 $found = 1;
                   1346:             }
                   1347:         }            
1.159     bowersj2 1348:     }        
1.140     bowersj2 1349: 
1.320     albertel 1350:     if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1.140     bowersj2 1351:         # If this is a click on a folder or something, we want to preserve the "here"
                   1352:         # from the querystring, and get the new "jump" marker
1.320     albertel 1353:         $here = $env{'form.here'};
                   1354:         $jump = $env{'form.jump'};
1.140     bowersj2 1355:     } 
                   1356:     
1.132     bowersj2 1357:     my $it = $args->{'iterator'};
                   1358:     if (!defined($it)) {
1.320     albertel 1359:         # Construct a default iterator based on $env{'form.'} information
1.140     bowersj2 1360:         
                   1361:         # Step 1: Check to see if we have a navmap
                   1362:         if (!defined($navmap)) {
1.221     bowersj2 1363:             $navmap = Apache::lonnavmaps::navmap->new();
1.423     raeburn  1364:             if (!defined($navmap)) {
                   1365:                 # no longer in course
                   1366:                 return '<span class="LC_error">'.&mt('No course selected').'</span><br />
                   1367:                         <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
                   1368:             }
1.140     bowersj2 1369:         }
                   1370: 
1.144     bowersj2 1371:         # See if we're being passed a specific map
                   1372:         if ($args->{'iterator_map'}) {
                   1373:             my $map = $args->{'iterator_map'};
1.145     bowersj2 1374:             $map = $navmap->getResourceByUrl($map);
1.144     bowersj2 1375:             my $firstResource = $map->map_start();
                   1376:             my $finishResource = $map->map_finish();
                   1377: 
                   1378:             $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
                   1379:         } else {
1.401     albertel 1380:             $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1.144     bowersj2 1381:         }
1.132     bowersj2 1382:     }
1.256     albertel 1383: 
1.159     bowersj2 1384:     # (re-)Locate the jump point, if any
1.191     bowersj2 1385:     # Note this does not take filtering or hidden into account... need
                   1386:     # to be fixed?
1.159     bowersj2 1387:     my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1.222     bowersj2 1388:     my $curRes;
1.159     bowersj2 1389:     my $foundJump = 0;
                   1390:     my $counter = 0;
                   1391:     
1.222     bowersj2 1392:     while (($curRes = $mapIterator->next()) && !$foundJump) {
1.159     bowersj2 1393:         if (ref($curRes)) { $counter++; }
                   1394:         
                   1395:         if (ref($curRes) && $jump eq $curRes->symb()) {
                   1396:             
                   1397:             # This is why we have to use the main iterator instead of the
                   1398:             # potentially faster DFS: The count has to be the same, so
                   1399:             # the order has to be the same, which DFS won't give us.
                   1400:             $args->{'currentJumpIndex'} = $counter;
                   1401:             $foundJump = 1;
                   1402:         }
                   1403:     }
                   1404: 
1.132     bowersj2 1405:     my $showParts = setDefault($args->{'showParts'}, 1);
                   1406:     my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139     bowersj2 1407:     # keeps track of when the current resource is found,
                   1408:     # so we can back up a few and put the anchor above the
                   1409:     # current resource
1.140     bowersj2 1410:     my $printKey = $args->{'printKey'};
                   1411:     my $printCloseAll = $args->{'printCloseAll'};
                   1412:     if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.425     schulted 1413:    
1.140     bowersj2 1414:     # Print key?
                   1415:     if ($printKey) {
                   1416:         $result .= '<table border="0" cellpadding="2" cellspacing="0">';
                   1417:         $result.='<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>';
1.298     albertel 1418: 	my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1.140     bowersj2 1419:         if ($navmap->{LAST_CHECK}) {
                   1420:             $result .= 
1.434     bisitz   1421:                 '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1.140     bowersj2 1422:                 strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   1423:                 '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
1.434     bisitz   1424:                 '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1.140     bowersj2 1425:                 '</td>'; 
                   1426:         } else {
                   1427:             $result .= '<td align="center" valign="bottom">&nbsp;&nbsp;'.
1.434     bisitz   1428:                 '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
                   1429:                 '&nbsp;&nbsp;<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1.140     bowersj2 1430:                 '</td>'; 
                   1431:         }
                   1432: 
                   1433:         $result .= '</tr></table>';
                   1434:     }
                   1435: 
1.172     bowersj2 1436:     if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.281     albertel 1437: 	my ($link,$text);
1.140     bowersj2 1438:         if ($condition) {
1.392     albertel 1439: 	    $link='"navmaps?condition=0&amp;filter=&amp;'.$queryString.
1.384     www      1440: 		'&here='.&escape($here).'"';
1.377     www      1441: 	    $text='Close all folders';
1.140     bowersj2 1442:         } else {
1.392     albertel 1443: 	    $link='"navmaps?condition=1&amp;filter=&amp;'.$queryString.
1.384     www      1444: 		'&here='.&escape($here).'"';
1.377     www      1445: 	    $text='Open all folders';
1.281     albertel 1446:         }
                   1447: 	if ($args->{'caller'} eq 'navmapsdisplay') {
                   1448: 	    &add_linkitem($args->{'linkitems'},'changefolder',
                   1449: 			  'location.href='.$link,$text);
                   1450: 	} else {
                   1451: 	    $result.='<a href='.$link.'>'.&mt($text).'</a>';
                   1452: 	}
1.266     raeburn  1453:         $result .= "\n";
                   1454:     }
1.140     bowersj2 1455: 
1.266     raeburn  1456:     # Check for any unread discussions in all resources.
1.281     albertel 1457:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.296     albertel 1458: 	&add_linkitem($args->{'linkitems'},'clearbubbles',
                   1459: 		      'document.clearbubbles.submit()',
                   1460: 		      'Mark all posts read');
1.297     albertel 1461: 	my $time=time;
1.296     albertel 1462: 	$result .= (<<END);
                   1463:     <form name="clearbubbles" method="post" action="/adm/feedback">
                   1464: 	<input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1.297     albertel 1465: 	<input type="hidden" name="navtime" value="$time" />
1.296     albertel 1466: END
                   1467:         if ($args->{'sort'} eq 'discussion') { 
                   1468: 	    my $totdisc = 0;
                   1469: 	    my $haveDisc = '';
                   1470: 	    my @allres=$navmap->retrieveResources();
                   1471: 	    foreach my $resource (@allres) {
                   1472: 		if ($resource->hasDiscussion()) {
1.323     albertel 1473: 		    $haveDisc .= $resource->wrap_symb().':';
1.296     albertel 1474: 		    $totdisc ++;
1.267     albertel 1475: 		}
                   1476: 	    }
1.296     albertel 1477: 	    if ($totdisc > 0) {
                   1478: 		$haveDisc =~ s/:$//;
                   1479: 		$result .= (<<END);
                   1480: 	<input type="hidden" name="navmaps" value="$haveDisc" />
                   1481:     </form>
                   1482: END
                   1483:             }
1.297     albertel 1484: 	}
                   1485: 	$result.='</form>';
1.266     raeburn  1486:     }
1.276     albertel 1487: 
1.425     schulted 1488:    
1.281     albertel 1489:     if ($args->{'caller'} eq 'navmapsdisplay') {
1.283     raeburn  1490:         $result .= '<table><tr><td>'.
1.388     albertel 1491:                    &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1.320     albertel 1492: 	if ($env{'environment.remotenavmap'} ne 'on') {
1.283     raeburn  1493: 	    $result .= '<td>&nbsp;</td>'; 
                   1494:         } else {
                   1495: 	    $result .= '</tr><tr>'; 
                   1496:         }
1.431     schulted 1497: 	$result.="<td class=\"LC_middle\">".mt('Tools:')."</td>";
1.430     schulted 1498: 	$result.=&show_linkitems_toolbar($args->{'linkitems'});
1.281     albertel 1499:         if ($args->{'sort_html'}) {
1.320     albertel 1500: 	    if ($env{'environment.remotenavmap'} ne 'on') {
1.281     albertel 1501: 		$result.='<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>'.
                   1502: 		    '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
                   1503: 	    } else {
                   1504: 		$result.='</tr><tr><td align="left"><br />'.
                   1505: 		    $args->{'sort_html'}.'</td></tr>';
                   1506: 	    }
                   1507: 	}
                   1508:         $result .= '</table>';
                   1509:     } elsif ($args->{'sort_html'}) { 
                   1510:         $result.=$args->{'sort_html'}; 
                   1511:     }
1.276     albertel 1512: 
1.425     schulted 1513:     #$result .= "<br />\n";
1.140     bowersj2 1514:     if ($r) {
                   1515:         $r->print($result);
                   1516:         $r->rflush();
                   1517:         $result = "";
                   1518:     }
1.132     bowersj2 1519:     # End parameter setting
1.425     schulted 1520:     
                   1521:     $result .= "<br />\n";
                   1522: 
1.132     bowersj2 1523:     # Data
1.431     schulted 1524:     $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");    
1.426     droeschl 1525: 
1.132     bowersj2 1526:     my $res = "Apache::lonnavmaps::resource";
                   1527:     my %condenseStatuses =
                   1528:         ( $res->NETWORK_FAILURE    => 1,
                   1529:           $res->NOTHING_SET        => 1,
                   1530:           $res->CORRECT            => 1 );
1.133     bowersj2 1531: 
                   1532:     # Shared variables
                   1533:     $args->{'counter'} = 0; # counts the rows
                   1534:     $args->{'indentLevel'} = 0;
                   1535:     $args->{'isNewBranch'} = 0;
1.426     droeschl 1536:     $args->{'condensed'} = 0;   
                   1537: 
1.428     droeschl 1538:     my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1.426     droeschl 1539:     $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1.133     bowersj2 1540:     $args->{'displayedHereMarker'} = 0;
1.132     bowersj2 1541: 
1.190     bowersj2 1542:     # If we're suppressing empty sequences, look for them here. Use DFS for speed,
                   1543:     # since structure actually doesn't matter, except what map has what resources.
                   1544:     if ($args->{'suppressEmptySequences'}) {
                   1545:         my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
                   1546:                                                          $it->{FIRST_RESOURCE},
                   1547:                                                          $it->{FINISH_RESOURCE},
                   1548:                                                          {}, undef, 1);
1.222     bowersj2 1549:         my $depth = 0;
1.190     bowersj2 1550:         $dfsit->next();
                   1551:         my $curRes = $dfsit->next();
                   1552:         while ($depth > -1) {
                   1553:             if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
                   1554:             if ($curRes == $dfsit->END_MAP()) { $depth--; }
                   1555: 
                   1556:             if (ref($curRes)) { 
                   1557:                 # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201     bowersj2 1558:                 if ($curRes->is_map()) {
1.190     bowersj2 1559:                     $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
                   1560:                     # Sequences themselves do not count as visible children,
                   1561:                     # unless those sequences also have visible children.
                   1562:                     # This means if a sequence appears, there's a "promise"
                   1563:                     # that there's something under it if you open it, somewhere.
                   1564:                 } else {
                   1565:                     # Not a sequence: if it's filtered, ignore it, otherwise
                   1566:                     # rise up the stack and mark the sequences as having children
                   1567:                     if (&$filterFunc($curRes)) {
                   1568:                         for my $sequence (@{$dfsit->getStack()}) {
                   1569:                             $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
                   1570:                         }
                   1571:                     }
                   1572:                 }
                   1573:             }
                   1574:         } continue {
                   1575:             $curRes = $dfsit->next();
                   1576:         }
                   1577:     }
                   1578: 
1.133     bowersj2 1579:     my $displayedJumpMarker = 0;
1.132     bowersj2 1580:     # Set up iteration.
                   1581:     my $now = time();
                   1582:     my $in24Hours = $now + 24 * 60 * 60;
                   1583:     my $rownum = 0;
                   1584: 
1.141     bowersj2 1585:     # export "here" marker information
                   1586:     $args->{'here'} = $here;
                   1587: 
1.222     bowersj2 1588:     $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1.270     albertel 1589:     my @resources;
                   1590:     my $code='';# sub { !(shift->is_map();) };
                   1591:     if ($args->{'sort'} eq 'title') {
1.276     albertel 1592:         my $oldFilterFunc = $filterFunc;
                   1593: 	my $filterFunc= 
                   1594: 	    sub {
                   1595: 		my ($res)=@_;
                   1596: 		if ($res->is_map()) { return 0;}
                   1597: 		return &$oldFilterFunc($res);
                   1598: 	    };
                   1599: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.296     albertel 1600: 	@resources= sort { &cmp_title($a,$b) } @resources;
                   1601:     } elsif ($args->{'sort'} eq 'duedate') {
                   1602: 	my $oldFilterFunc = $filterFunc;
                   1603: 	my $filterFunc= 
                   1604: 	    sub {
                   1605: 		my ($res)=@_;
                   1606: 		if (!$res->is_problem()) { return 0;}
                   1607: 		return &$oldFilterFunc($res);
                   1608: 	    };
                   1609: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
1.289     raeburn  1610: 	@resources= sort {
1.270     albertel 1611: 	    if ($a->duedate ne $b->duedate) {
                   1612: 	        return $a->duedate cmp $b->duedate;
                   1613: 	    }
1.296     albertel 1614: 	    my $value=&cmp_title($a,$b);
                   1615: 	    return $value;
1.270     albertel 1616: 	} @resources;
1.296     albertel 1617:     } elsif ($args->{'sort'} eq 'discussion') {
                   1618: 	my $oldFilterFunc = $filterFunc;
                   1619: 	my $filterFunc= 
                   1620: 	    sub {
                   1621: 		my ($res)=@_;
                   1622: 		if (!$res->hasDiscussion() &&
                   1623: 		    !$res->getFeedback() &&
                   1624: 		    !$res->getErrors()) { return 0;}
                   1625: 		return &$oldFilterFunc($res);
                   1626: 	    };
                   1627: 	@resources=$navmap->retrieveResources(undef,$filterFunc);
                   1628: 	@resources= sort { &cmp_title($a,$b) } @resources;
1.276     albertel 1629:     } else {
                   1630: 	#unknow sort mechanism or default
                   1631: 	undef($args->{'sort'});
1.270     albertel 1632:     }
                   1633: 
1.276     albertel 1634: 
1.270     albertel 1635:     while (1) {
                   1636: 	if ($args->{'sort'}) {
                   1637: 	    $curRes = shift(@resources);
                   1638: 	} else {
                   1639: 	    $curRes = $it->next($closeAllPages);
                   1640: 	}
                   1641: 	if (!$curRes) { last; }
                   1642: 
1.132     bowersj2 1643:         # Maintain indentation level.
                   1644:         if ($curRes == $it->BEGIN_MAP() ||
                   1645:             $curRes == $it->BEGIN_BRANCH() ) {
1.133     bowersj2 1646:             $args->{'indentLevel'}++;
1.132     bowersj2 1647:         }
                   1648:         if ($curRes == $it->END_MAP() ||
                   1649:             $curRes == $it->END_BRANCH() ) {
1.133     bowersj2 1650:             $args->{'indentLevel'}--;
1.132     bowersj2 1651:         }
                   1652:         # Notice new branches
                   1653:         if ($curRes == $it->BEGIN_BRANCH()) {
1.133     bowersj2 1654:             $args->{'isNewBranch'} = 1;
                   1655:         }
                   1656: 
                   1657:         # If this isn't an actual resource, continue on
                   1658:         if (!ref($curRes)) {
                   1659:             next;
1.132     bowersj2 1660:         }
1.133     bowersj2 1661: 
1.143     bowersj2 1662:         # If this has been filtered out, continue on
                   1663:         if (!(&$filterFunc($curRes))) {
                   1664:             $args->{'isNewBranch'} = 0; # Don't falsely remember this
                   1665:             next;
                   1666:         } 
1.132     bowersj2 1667: 
1.190     bowersj2 1668:         # If this is an empty sequence and we're filtering them, continue on
1.201     bowersj2 1669:         if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190     bowersj2 1670:             !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
                   1671:             next;
                   1672:         }
                   1673: 
1.153     bowersj2 1674:         # If we're suppressing navmaps and this is a navmap, continue on
                   1675:         if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
                   1676:             next;
                   1677:         }
                   1678: 
1.191     bowersj2 1679:         $args->{'counter'}++;
                   1680: 
1.132     bowersj2 1681:         # Does it have multiple parts?
1.133     bowersj2 1682:         $args->{'multipart'} = 0;
                   1683:         $args->{'condensed'} = 0;
1.132     bowersj2 1684:         my @parts;
                   1685:             
                   1686:         # Decide what parts to show.
1.133     bowersj2 1687:         if ($curRes->is_problem() && $showParts) {
1.132     bowersj2 1688:             @parts = @{$curRes->parts()};
1.192     bowersj2 1689:             $args->{'multipart'} = $curRes->multipart();
1.132     bowersj2 1690:             
                   1691:             if ($condenseParts) { # do the condensation
1.133     bowersj2 1692:                 if (!$args->{'condensed'}) {
1.132     bowersj2 1693:                     # Decide whether to condense based on similarity
1.192     bowersj2 1694:                     my $status = $curRes->status($parts[0]);
                   1695:                     my $due = $curRes->duedate($parts[0]);
                   1696:                     my $open = $curRes->opendate($parts[0]);
1.132     bowersj2 1697:                     my $statusAllSame = 1;
                   1698:                     my $dueAllSame = 1;
                   1699:                     my $openAllSame = 1;
1.192     bowersj2 1700:                     for (my $i = 1; $i < scalar(@parts); $i++) {
1.132     bowersj2 1701:                         if ($curRes->status($parts[$i]) != $status){
                   1702:                             $statusAllSame = 0;
                   1703:                         }
                   1704:                         if ($curRes->duedate($parts[$i]) != $due ) {
                   1705:                             $dueAllSame = 0;
                   1706:                         }
                   1707:                         if ($curRes->opendate($parts[$i]) != $open) {
                   1708:                             $openAllSame = 0;
                   1709:                         }
                   1710:                     }
                   1711:                     # $*allSame is true if all the statuses were
                   1712:                     # the same. Now, if they are all the same and
                   1713:                     # match one of the statuses to condense, or they
                   1714:                     # are all open with the same due date, or they are
                   1715:                     # all OPEN_LATER with the same open date, display the
                   1716:                     # status of the first non-zero part (to get the 'correct'
                   1717:                     # status right, since 0 is never 'correct' or 'open').
                   1718:                     if (($statusAllSame && defined($condenseStatuses{$status})) ||
                   1719:                         ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                   1720:                         ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192     bowersj2 1721:                         @parts = ($parts[0]);
1.133     bowersj2 1722:                         $args->{'condensed'} = 1;
1.132     bowersj2 1723:                     }
                   1724:                 }
1.198     bowersj2 1725: 		# Multipart problem with one part: always "condense" (happens
                   1726: 		#  to match the desirable behavior)
                   1727: 		if ($curRes->countParts() == 1) {
                   1728: 		    @parts = ($parts[0]);
                   1729: 		    $args->{'condensed'} = 1;
                   1730: 		}
1.132     bowersj2 1731:             }
1.157     bowersj2 1732:         } 
1.132     bowersj2 1733:             
                   1734:         # If the multipart problem was condensed, "forget" it was multipart
                   1735:         if (scalar(@parts) == 1) {
1.133     bowersj2 1736:             $args->{'multipart'} = 0;
1.192     bowersj2 1737:         } else {
                   1738:             # Add part 0 so we display it correctly.
                   1739:             unshift @parts, '0';
1.132     bowersj2 1740:         }
1.310     albertel 1741: 	
                   1742: 	{
                   1743: 	    my ($src,$symb,$anchor,$stack);
                   1744: 	    if ($args->{'sort'}) {
                   1745: 		my $it = $navmap->getIterator(undef, undef, undef, 1);
                   1746: 		while ( my $res=$it->next()) {
                   1747: 		    if (ref($res) &&
                   1748: 			$res->symb() eq  $curRes->symb()) { last; }
                   1749: 		}
                   1750: 		$stack=$it->getStack();
                   1751: 	    } else {
                   1752: 		$stack=$it->getStack();
                   1753: 	    }
                   1754: 	    ($src,$symb,$anchor)=getLinkForResource($stack);
                   1755: 	    if (defined($anchor)) { $anchor='#'.$anchor; }
                   1756: 	    my $srcHasQuestion = $src =~ /\?/;
                   1757: 	    $args->{"resourceLink"} = $src.
                   1758: 		($srcHasQuestion?'&':'?') .
1.384     www      1759: 		'symb=' . &escape($symb).$anchor;
1.310     albertel 1760: 	}
1.132     bowersj2 1761:         # Now, we've decided what parts to show. Loop through them and
                   1762:         # show them.
1.192     bowersj2 1763:         foreach my $part (@parts) {
1.132     bowersj2 1764:             $rownum ++;
                   1765:             
1.431     schulted 1766:             $result .= &Apache::loncommon::start_data_table_row();
1.134     bowersj2 1767: 
                   1768:             # Set up some data about the parts that the cols might want
                   1769:             my $filter = $it->{FILTER};
1.270     albertel 1770: 
1.132     bowersj2 1771:             # Now, display each column.
                   1772:             foreach my $col (@$cols) {
1.139     bowersj2 1773:                 my $colHTML = '';
                   1774:                 if (ref($col)) {
                   1775:                     $colHTML .= &$col($curRes, $part, $args);
                   1776:                 } else {
                   1777:                     $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
                   1778:                 }
1.132     bowersj2 1779: 
1.133     bowersj2 1780:                 # If this is the first column and it's time to print
                   1781:                 # the anchor, do so
                   1782:                 if ($col == $cols->[0] && 
                   1783:                     $args->{'counter'} == $args->{'currentJumpIndex'} - 
1.139     bowersj2 1784:                     $currentJumpDelta) {
                   1785:                     # Jam the anchor after the <td> tag;
                   1786:                     # necessary for valid HTML (which Mozilla requires)
                   1787:                     $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133     bowersj2 1788:                     $displayedJumpMarker = 1;
                   1789:                 }
1.139     bowersj2 1790:                 $result .= $colHTML . "\n";
1.132     bowersj2 1791:             }
1.431     schulted 1792:             $result .= &Apache::loncommon::end_data_table_row();
1.140     bowersj2 1793:             $args->{'isNewBranch'} = 0;
1.139     bowersj2 1794:         }
1.153     bowersj2 1795: 
1.139     bowersj2 1796:         if ($r && $rownum % 20 == 0) {
                   1797:             $r->print($result);
                   1798:             $result = "";
                   1799:             $r->rflush();
1.132     bowersj2 1800:         }
1.156     bowersj2 1801:     } continue {
1.208     bowersj2 1802: 	if ($r) {
                   1803: 	    # If we have the connection, make sure the user is still connected
                   1804: 	    my $c = $r->connection;
                   1805: 	    if ($c->aborted()) {
                   1806: 		# Who cares what we do, nobody will see it anyhow.
                   1807: 		return '';
                   1808: 	    }
                   1809: 	}
1.132     bowersj2 1810:     }
                   1811:     
1.134     bowersj2 1812:     # Print out the part that jumps to #curloc if it exists
1.159     bowersj2 1813:     # delay needed because the browser is processing the jump before
                   1814:     # it finishes rendering, so it goes to the wrong place!
                   1815:     # onload might be better, but this routine has no access to that.
                   1816:     # On mozilla, the 0-millisecond timeout seems to prevent this;
                   1817:     # it's quite likely this might fix other browsers, too, and 
                   1818:     # certainly won't hurt anything.
1.139     bowersj2 1819:     if ($displayedJumpMarker) {
1.247     albertel 1820:         $result .= "
                   1821: <script>
                   1822: if (location.href.indexOf('#curloc')==-1) {
                   1823:     setTimeout(\"location += '#curloc';\", 0)
                   1824: }
                   1825: </script>";
1.134     bowersj2 1826:     }
                   1827: 
1.431     schulted 1828:     $result.=&Apache::loncommon::end_data_table();
                   1829: 
1.140     bowersj2 1830:     if ($r) {
                   1831:         $r->print($result);
                   1832:         $result = "";
                   1833:         $r->rflush();
                   1834:     }
                   1835:         
1.132     bowersj2 1836:     return $result;
                   1837: }
                   1838: 
1.281     albertel 1839: sub add_linkitem {
                   1840:     my ($linkitems,$name,$cmd,$text)=@_;
                   1841:     $$linkitems{$name}{'cmd'}=$cmd;
                   1842:     $$linkitems{$name}{'text'}=&mt($text);
                   1843: }
                   1844: 
                   1845: sub show_linkitems {
                   1846:     my ($linkitems)=@_;
1.312     albertel 1847:     my @linkorder = ("blank","launchnav","closenav","firsthomework",
                   1848: 		     "everything","uncompleted","changefolder","clearbubbles");
1.281     albertel 1849:     
                   1850:     my $result .= (<<ENDBLOCK);
1.283     raeburn  1851:               <td align="left">
1.281     albertel 1852: <script type="text/javascript">
                   1853:     function changeNavDisplay () {
                   1854: 	var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
                   1855: ENDBLOCK
                   1856:     foreach my $link (@linkorder) {
                   1857: 	$result.= "if (navchoice == '$link') {".
                   1858: 	    $linkitems->{$link}{'cmd'}."}\n";
                   1859:     }
                   1860:     $result.='}
                   1861:               </script>
                   1862:                    <form name="linkitems" method="post">
1.421     bisitz   1863:                        <span class="LC_nobreak"><select name="toplink">'."\n";
1.281     albertel 1864:     foreach my $link (@linkorder) {
                   1865: 	if (defined($linkitems->{$link})) {
                   1866: 	    if ($linkitems->{$link}{'text'} ne '') {
                   1867: 		$result .= ' <option value="'.$link.'">'.
                   1868: 		    $linkitems->{$link}{'text'}."</option>\n";
                   1869: 	    }
                   1870: 	}
                   1871:     }
                   1872:     $result .= '</select>&nbsp;<input type="button" name="chgnav"
                   1873:                    value="Go" onClick="javascript:changeNavDisplay()" />
1.421     bisitz   1874:                 </span></form></td>'."\n";
1.298     albertel 1875: 	
1.281     albertel 1876:     return $result;
                   1877: }
                   1878: 
1.430     schulted 1879: sub show_linkitems_toolbar {
                   1880:     my ($linkitems,$condition)=@_;
                   1881:     my @linkorder = ("blank","launchnav","closenav","firsthomework",
                   1882: 		     "everything","uncompleted","changefolder","clearbubbles");
                   1883:     
                   1884:     my $result .=' 
                   1885:               <td align="left">
                   1886:                        <span class="LC_nobreak">'."\n<ul id=\"LC_toolbar\">";
                   1887: 	foreach my $link (@linkorder) {
                   1888:         my $link_id = "LC_content_toolbar_".$link;
                   1889: 	if (defined($linkitems->{$link})) {
                   1890: 	    if ($linkitems->{$link}{'text'} ne '') {
                   1891: 		$linkitems->{$link}{'cmd'}=~s/"/'/g;
                   1892: 		if($linkitems->{$link}{'cmd'}){
                   1893:                    if($link eq 'changefolder'){
                   1894:                       if($condition){$link_id='LC_content_toolbar_changefolder_toggled'}
                   1895:                       else{$link_id='LC_content_toolbar_changefolder'}
                   1896:                    }
                   1897:                           $result .=  ' <li><a href="#"'.
                   1898: 			    	' onClick="'.$linkitems->{$link}{'cmd'}.'"'.
                   1899:                                 ' id="'.$link_id.'"'.
                   1900:                                 ' class="LC_toolbarItem"'.
                   1901: 			   	' title="'.$linkitems->{$link}{'text'}.'"></a></li>'."\n";
                   1902: 		}
                   1903: 
                   1904: 	    }
                   1905: 	}
                   1906:     }
                   1907:     $result .= '</ul>';
                   1908:     $result .= ' </span></td>'."\n";
                   1909: 	
                   1910:     return $result;
                   1911: }
                   1912: 
                   1913: 
1.133     bowersj2 1914: 1;
                   1915: 
1.418     jms      1916: 
                   1917: 
                   1918: 
                   1919: 
                   1920: 
                   1921: 
                   1922: 
                   1923: 
1.133     bowersj2 1924: package Apache::lonnavmaps::navmap;
                   1925: 
                   1926: =pod
                   1927: 
1.216     bowersj2 1928: =head1 Object: Apache::lonnavmaps::navmap
1.133     bowersj2 1929: 
1.217     bowersj2 1930: =head2 Overview
1.133     bowersj2 1931: 
1.217     bowersj2 1932: The navmap object's job is to provide access to the resources
                   1933: in the course as Apache::lonnavmaps::resource objects, and to
                   1934: query and manage the relationship between those resource objects.
                   1935: 
                   1936: Generally, you'll use the navmap object in one of three basic ways.
                   1937: In order of increasing complexity and power:
                   1938: 
                   1939: =over 4
                   1940: 
1.358     albertel 1941: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1.217     bowersj2 1942:     various ways to obtain resource objects, based on various identifiers.
                   1943:     Use this when you want to request information about one object or 
                   1944:     a handful of resources you already know the identities of, from some
                   1945:     other source. For more about Ids, Symbs, and MapPcs, see the
                   1946:     Resource documentation. Note that Url should be a B<last resort>,
1.358     albertel 1947:     not your first choice; it only really works when there is only one
1.217     bowersj2 1948:     instance of the resource in the course, which only applies to
1.358     albertel 1949:     maps, and even that may change in the future (see the B<getResourceByUrl>
                   1950:     documentation for more details.)
1.217     bowersj2 1951: 
                   1952: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
                   1953:     retrieves resources matching some criterion and returns them
                   1954:     in a flat array, with no structure information. Use this when
                   1955:     you are manipulating a series of resources, based on what map
                   1956:     the are in, but do not care about branching, or exactly how
                   1957:     the maps and resources are related. This is the most common case.
                   1958: 
                   1959: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
                   1960:     the course's navmap in various ways without writing the traversal
                   1961:     code yourself. See iterator documentation below. Use this when
                   1962:     you need to know absolutely everything about the course, including
                   1963:     branches and the precise relationship between maps and resources.
                   1964: 
                   1965: =back
                   1966: 
                   1967: =head2 Creation And Destruction
                   1968: 
                   1969: To create a navmap object, use the following function:
1.133     bowersj2 1970: 
                   1971: =over 4
                   1972: 
1.221     bowersj2 1973: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1.133     bowersj2 1974: 
1.221     bowersj2 1975: Creates a new navmap object. Returns the navmap object if this is
                   1976: successful, or B<undef> if not.
1.174     albertel 1977: 
1.216     bowersj2 1978: =back
                   1979: 
                   1980: =head2 Methods
                   1981: 
                   1982: =over 4
                   1983: 
1.174     albertel 1984: =item * B<getIterator>(first, finish, filter, condition):
                   1985: 
                   1986: See iterator documentation below.
1.133     bowersj2 1987: 
                   1988: =cut
                   1989: 
                   1990: use strict;
                   1991: use GDBM_File;
1.320     albertel 1992: use Apache::lonnet;
1.397     albertel 1993: use LONCAPA;
1.133     bowersj2 1994: 
                   1995: sub new {
                   1996:     # magic invocation to create a class instance
                   1997:     my $proto = shift;
                   1998:     my $class = ref($proto) || $proto;
                   1999:     my $self = {};
                   2000: 
                   2001:     # Resource cache stores navmap resources as we reference them. We generate
                   2002:     # them on-demand so we don't pay for creating resources unless we use them.
                   2003:     $self->{RESOURCE_CACHE} = {};
                   2004: 
                   2005:     # Network failure flag, if we accessed the course or user opt and
                   2006:     # failed
                   2007:     $self->{NETWORK_FAILURE} = 0;
                   2008: 
                   2009:     # tie the nav hash
                   2010: 
1.168     bowersj2 2011:     my %navmaphash;
                   2012:     my %parmhash;
1.320     albertel 2013:     my $courseFn = $env{"request.course.fn"};
1.220     bowersj2 2014:     if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
1.133     bowersj2 2015:               &GDBM_READER(), 0640))) {
                   2016:         return undef;
                   2017:     }
                   2018:     
1.220     bowersj2 2019:     if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
1.133     bowersj2 2020:               &GDBM_READER(), 0640)))
                   2021:     {
1.170     matthew  2022:         untie %{$self->{PARM_HASH}};
1.133     bowersj2 2023:         return undef;
                   2024:     }
                   2025: 
1.199     bowersj2 2026:     $self->{NAV_HASH} = \%navmaphash;
1.168     bowersj2 2027:     $self->{PARM_HASH} = \%parmhash;
1.221     bowersj2 2028:     $self->{PARM_CACHE} = {};
1.133     bowersj2 2029: 
                   2030:     bless($self);
                   2031:         
                   2032:     return $self;
                   2033: }
                   2034: 
1.221     bowersj2 2035: sub generate_course_user_opt {
1.133     bowersj2 2036:     my $self = shift;
1.221     bowersj2 2037:     if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
1.133     bowersj2 2038: 
1.320     albertel 2039:     my $uname=$env{'user.name'};
                   2040:     my $udom=$env{'user.domain'};
                   2041:     my $cid=$env{'request.course.id'};
1.326     albertel 2042:     my $cdom=$env{'course.'.$cid.'.domain'};
                   2043:     my $cnum=$env{'course.'.$cid.'.num'};
1.221     bowersj2 2044:     
1.133     bowersj2 2045: # ------------------------------------------------- Get coursedata (if present)
1.326     albertel 2046:     my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
                   2047:     # Check for network failure
                   2048:     if (!ref($courseopt)) {
                   2049: 	if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
1.324     albertel 2050: 	    $self->{NETWORK_FAILURE} = 1;
1.221     bowersj2 2051: 	}
1.326     albertel 2052: 	undef($courseopt);
                   2053:     }
1.325     albertel 2054: 
1.133     bowersj2 2055: # --------------------------------------------------- Get userdata (if present)
1.325     albertel 2056: 	
1.326     albertel 2057:     my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
                   2058:     # Check for network failure
                   2059:     if (!ref($useropt)) {
                   2060: 	if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
1.324     albertel 2061: 	    $self->{NETWORK_FAILURE} = 1;
1.221     bowersj2 2062: 	}
1.326     albertel 2063: 	undef($useropt);
1.221     bowersj2 2064:     }
                   2065: 
1.326     albertel 2066:     $self->{COURSE_OPT} = $courseopt;
                   2067:     $self->{USER_OPT} = $useropt;
                   2068: 
1.221     bowersj2 2069:     $self->{COURSE_USER_OPT_GENERATED} = 1;
                   2070:     
                   2071:     return;
                   2072: }
                   2073: 
                   2074: sub generate_email_discuss_status {
                   2075:     my $self = shift;
1.259     raeburn  2076:     my $symb = shift;
1.221     bowersj2 2077:     if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
1.133     bowersj2 2078: 
1.320     albertel 2079:     my $cid=$env{'request.course.id'};
1.326     albertel 2080:     my $cdom=$env{'course.'.$cid.'.domain'};
                   2081:     my $cnum=$env{'course.'.$cid.'.num'};
1.221     bowersj2 2082:     
                   2083:     my %emailstatus = &Apache::lonnet::dump('email_status');
                   2084:     my $logoutTime = $emailstatus{'logout'};
1.320     albertel 2085:     my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
1.221     bowersj2 2086:     $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
                   2087: 			   $courseLeaveTime : $logoutTime);
                   2088:     my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
                   2089: 					       $cdom, $cnum);
1.259     raeburn  2090:     my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
1.320     albertel 2091:                                         $env{'user.domain'},$env{'user.name'},'lastread');
1.259     raeburn  2092:     my %lastreadtime = ();
1.394     raeburn  2093:     foreach my $key (keys %lastread) {
                   2094:         my $shortkey = $key;
                   2095:         $shortkey =~ s/_lastread$//;
                   2096:         $lastreadtime{$shortkey} = $lastread{$key};
1.259     raeburn  2097:     }
                   2098: 
1.221     bowersj2 2099:     my %feedback=();
                   2100:     my %error=();
1.325     albertel 2101:     my @keys = &Apache::lonnet::getkeys('nohist_email',$env{'user.domain'},
                   2102: 					$env{'user.name'});
1.221     bowersj2 2103:     
1.325     albertel 2104:     foreach my $msgid (@keys) {
1.295     albertel 2105: 	if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
1.395     raeburn  2106:             my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
                   2107:                 $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
1.396     raeburn  2108:             &Apache::lonenc::check_decrypt(\$symb); 
                   2109:             if (($fromcid ne '') && ($fromcid ne $cid)) {
                   2110:                 next;
                   2111:             }
1.395     raeburn  2112:             if (defined($symb)) {
                   2113:                 if (defined($error) && $error == 1) {
                   2114:                     $error{$symb}.=','.$msgid;
                   2115:                 } else {
                   2116:                     $feedback{$symb}.=','.$msgid;
                   2117:                 }
                   2118:             } else {
                   2119:                 my $plain=
                   2120:                     &LONCAPA::unescape(&LONCAPA::unescape($msgid));
                   2121:                 if ($plain=~/ \[([^\]]+)\]\:/) {
                   2122:                     my $url=$1;
                   2123:                     if ($plain=~/\:Error \[/) {
                   2124:                         $error{$url}.=','.$msgid;
                   2125:                     } else {
                   2126:                         $feedback{$url}.=','.$msgid;
                   2127:                     }
                   2128:                 }
                   2129:             }
1.221     bowersj2 2130: 	}
1.211     bowersj2 2131:     }
1.221     bowersj2 2132:     
1.395     raeburn  2133:     #symbs of resources that have feedbacks (will be urls pre-2.3)
1.221     bowersj2 2134:     $self->{FEEDBACK} = \%feedback;
1.395     raeburn  2135:     #or errors (will be urls pre 2.3)
1.295     albertel 2136:     $self->{ERROR_MSG} = \%error;
1.221     bowersj2 2137:     $self->{DISCUSSION_TIME} = \%discussiontime;
                   2138:     $self->{EMAIL_STATUS} = \%emailstatus;
1.259     raeburn  2139:     $self->{LAST_READ} = \%lastreadtime;
1.221     bowersj2 2140:     
                   2141:     $self->{EMAIL_DISCUSS_GENERATED} = 1;
                   2142: }
                   2143: 
                   2144: sub get_user_data {
                   2145:     my $self = shift;
                   2146:     if ($self->{RETRIEVED_USER_DATA}) { return; }
1.211     bowersj2 2147: 
1.221     bowersj2 2148:     # Retrieve performance data on problems
1.320     albertel 2149:     my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
                   2150: 						   $env{'user.domain'},
                   2151: 						   $env{'user.name'});
1.221     bowersj2 2152:     $self->{STUDENT_DATA} = \%student_data;
1.133     bowersj2 2153: 
1.221     bowersj2 2154:     $self->{RETRIEVED_USER_DATA} = 1;
1.133     bowersj2 2155: }
                   2156: 
1.354     raeburn  2157: sub get_discussion_data {
                   2158:     my $self = shift;
                   2159:     if ($self->{RETRIEVED_DISCUSSION_DATA}) {
1.366     albertel 2160: 	return $self->{DISCUSSION_DATA};
1.354     raeburn  2161:     }
1.366     albertel 2162: 
                   2163:     $self->generate_email_discuss_status();    
                   2164: 
1.354     raeburn  2165:     my $cid=$env{'request.course.id'};
                   2166:     my $cdom=$env{'course.'.$cid.'.domain'};
                   2167:     my $cnum=$env{'course.'.$cid.'.num'};
                   2168:     # Retrieve discussion data for resources in course
1.367     albertel 2169:     my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
1.366     albertel 2170: 
                   2171: 
1.354     raeburn  2172:     $self->{DISCUSSION_DATA} = \%discussion_data;
                   2173:     $self->{RETRIEVED_DISCUSSION_DATA} = 1;
                   2174:     return $self->{DISCUSSION_DATA};
                   2175: }
                   2176: 
                   2177: 
1.133     bowersj2 2178: # Internal function: Takes a key to look up in the nav hash and implements internal
                   2179: # memory caching of that key.
                   2180: sub navhash {
                   2181:     my $self = shift; my $key = shift;
                   2182:     return $self->{NAV_HASH}->{$key};
                   2183: }
                   2184: 
1.217     bowersj2 2185: =pod
                   2186: 
                   2187: =item * B<courseMapDefined>(): Returns true if the course map is defined, 
                   2188:     false otherwise. Undefined course maps indicate an error somewhere in
                   2189:     LON-CAPA, and you will not be able to proceed with using the navmap.
                   2190:     See the B<NAV> screen for an example of using this.
                   2191: 
                   2192: =cut
                   2193: 
1.133     bowersj2 2194: # Checks to see if coursemap is defined, matching test in old lonnavmaps
                   2195: sub courseMapDefined {
                   2196:     my $self = shift;
1.320     albertel 2197:     my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
1.133     bowersj2 2198: 
                   2199:     my $firstres = $self->navhash("map_start_$uri");
                   2200:     my $lastres = $self->navhash("map_finish_$uri");
                   2201:     return $firstres && $lastres;
                   2202: }
                   2203: 
                   2204: sub getIterator {
                   2205:     my $self = shift;
                   2206:     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1.314     albertel 2207:                                                      shift, undef, shift,
                   2208: 						     shift, shift);
1.133     bowersj2 2209:     return $iterator;
                   2210: }
                   2211: 
                   2212: # Private method: Does the given resource (as a symb string) have
                   2213: # current discussion? Returns 0 if chat/mail data not extracted.
                   2214: sub hasDiscussion {
                   2215:     my $self = shift;
                   2216:     my $symb = shift;
1.221     bowersj2 2217:     $self->generate_email_discuss_status();
                   2218: 
1.133     bowersj2 2219:     if (!defined($self->{DISCUSSION_TIME})) { return 0; }
                   2220: 
                   2221:     #return defined($self->{DISCUSSION_TIME}->{$symb});
1.259     raeburn  2222: 
1.323     albertel 2223:     # backward compatibility (bulletin boards used to be 'wrapped')
                   2224:     my $ressymb = $self->wrap_symb($symb);
1.259     raeburn  2225:     if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
                   2226:         return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
                   2227:     } else {
1.266     raeburn  2228: #        return $self->{DISCUSSION_TIME}->{$ressymb} >  $self->{LAST_CHECK}; # v.1.1 behavior 
                   2229:         return $self->{DISCUSSION_TIME}->{$ressymb} >  0; # in 1.2 will display speech bubble icons for all items with posts until marked as read (even if read in v 1.1).
1.259     raeburn  2230:     }
1.133     bowersj2 2231: }
                   2232: 
1.366     albertel 2233: sub last_post_time {
                   2234:     my $self = shift;
                   2235:     my $symb = shift;
                   2236:     my $ressymb = $self->wrap_symb($symb);
                   2237:     return $self->{DISCUSSION_TIME}->{$ressymb};
                   2238: }
                   2239: 
1.393     raeburn  2240: sub discussion_info {
1.366     albertel 2241:     my $self = shift;
                   2242:     my $symb = shift;
1.393     raeburn  2243:     my $filter = shift;
1.366     albertel 2244: 
                   2245:     $self->get_discussion_data();
1.372     raeburn  2246: 
1.366     albertel 2247:     my $ressymb = $self->wrap_symb($symb);
1.372     raeburn  2248:     # keys used to store bulletinboard postings use 'unwrapped' symb. 
1.397     albertel 2249:     my $discsymb = &escape($self->unwrap_symb($ressymb));
1.372     raeburn  2250:     my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
1.366     albertel 2251:     if (!$version) { return; }
                   2252: 
                   2253:     my $prevread = $self->{LAST_READ}{$ressymb};
                   2254: 
1.393     raeburn  2255:     my $count = 0;
1.366     albertel 2256:     my $hiddenflag = 0;
                   2257:     my $deletedflag = 0;
1.393     raeburn  2258:     my ($hidden,$deleted,%info);
1.366     albertel 2259: 
                   2260:     for (my $id=$version; $id>0; $id--) {
1.372     raeburn  2261: 	my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
1.366     albertel 2262: 	my @keys=split(/:/,$vkeys);
                   2263: 	if (grep(/^hidden$/ ,@keys)) {
                   2264: 	    if (!$hiddenflag) {
1.372     raeburn  2265: 		$hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
1.366     albertel 2266: 		$hiddenflag = 1;
                   2267: 	    }
                   2268: 	} elsif (grep(/^deleted$/,@keys)) {
                   2269: 	    if (!$deletedflag) {
1.372     raeburn  2270: 		$deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
1.366     albertel 2271: 		$deletedflag = 1;
                   2272: 	    }
                   2273: 	} else {
1.393     raeburn  2274: 	    if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
                   2275:                 if ($filter eq 'unread') {
                   2276: 		    if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
                   2277:                         next;
                   2278:                     }
                   2279:                 }
                   2280: 		$count++;
                   2281: 		$info{$count}{'subject'} =
                   2282: 		    $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
                   2283:                 $info{$count}{'id'} = $id;
                   2284:                 $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
                   2285:             }
1.366     albertel 2286: 	}
                   2287:     }
                   2288:     if (wantarray) {
1.393     raeburn  2289: 	return ($count,%info);
1.366     albertel 2290:     }
1.393     raeburn  2291:     return $count;
1.366     albertel 2292: }
                   2293: 
1.321     raeburn  2294: sub wrap_symb {
1.322     albertel 2295:     my $self = shift;
1.321     raeburn  2296:     my $symb = shift;
1.373     albertel 2297:     if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
1.322     albertel 2298:         unless ($symb =~ m|adm/wrapper/adm|) {
                   2299:             $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
1.321     raeburn  2300:         }
                   2301:     }
1.322     albertel 2302:     return $symb;
1.321     raeburn  2303: }
                   2304: 
1.372     raeburn  2305: sub unwrap_symb {
                   2306:     my $self = shift;
                   2307:     my $ressymb = shift;
                   2308:     my $discsymb = $ressymb;
1.373     albertel 2309:     if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
1.372     raeburn  2310:          $discsymb = $1.$2;
                   2311:     }
                   2312:     return $discsymb;
                   2313: }
                   2314: 
1.322     albertel 2315: # Private method: Does the given resource (as a symb string) have
                   2316: # current feedback? Returns the string in the feedback hash, which
                   2317: # will be false if it does not exist.
                   2318: 
1.133     bowersj2 2319: sub getFeedback { 
                   2320:     my $self = shift;
                   2321:     my $symb = shift;
1.395     raeburn  2322:     my $source = shift;
1.133     bowersj2 2323: 
1.221     bowersj2 2324:     $self->generate_email_discuss_status();
                   2325: 
1.133     bowersj2 2326:     if (!defined($self->{FEEDBACK})) { return ""; }
                   2327:     
1.395     raeburn  2328:     my $feedback;
                   2329:     if ($self->{FEEDBACK}->{$symb}) {
                   2330:         $feedback = $self->{FEEDBACK}->{$symb};
                   2331:         if ($self->{FEEDBACK}->{$source}) {
                   2332:             $feedback .= ','.$self->{FEEDBACK}->{$source};
                   2333:         }
                   2334:     } else {
                   2335:         if ($self->{FEEDBACK}->{$source}) {
                   2336:             $feedback = $self->{FEEDBACK}->{$source};
                   2337:         }
                   2338:     }
                   2339:     return $feedback;
1.133     bowersj2 2340: }
                   2341: 
                   2342: # Private method: Get the errors for that resource (by source).
                   2343: sub getErrors { 
                   2344:     my $self = shift;
1.395     raeburn  2345:     my $symb = shift;
1.133     bowersj2 2346:     my $src = shift;
1.221     bowersj2 2347: 
                   2348:     $self->generate_email_discuss_status();
                   2349: 
1.133     bowersj2 2350:     if (!defined($self->{ERROR_MSG})) { return ""; }
1.395     raeburn  2351: 
                   2352:     my $errors;
                   2353:     if ($self->{ERROR_MSG}->{$symb}) {
                   2354:         $errors = $self->{ERROR_MSG}->{$symb};
                   2355:         if ($self->{ERROR_MSG}->{$src}) {
                   2356:             $errors .= ','.$self->{ERROR_MSG}->{$src};
                   2357:         }
                   2358:     } else {
                   2359:         if ($self->{ERROR_MSG}->{$src}) {
                   2360:             $errors = $self->{ERROR_MSG}->{$src};
                   2361:         }
                   2362:     }
                   2363:     return $errors;
1.133     bowersj2 2364: }
                   2365: 
                   2366: =pod
                   2367: 
1.174     albertel 2368: =item * B<getById>(id):
                   2369: 
                   2370: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
                   2371: object for that resource. This method, or other methods that use it
                   2372: (as in the resource object) is the only proper way to obtain a
                   2373: resource object.
1.133     bowersj2 2374: 
1.194     bowersj2 2375: =item * B<getBySymb>(symb):
                   2376: 
                   2377: Based on the symb of the resource, get a resource object for that
                   2378: resource. This is one of the proper ways to get a resource object.
                   2379: 
                   2380: =item * B<getMapByMapPc>(map_pc):
                   2381: 
                   2382: Based on the map_pc of the resource, get a resource object for
                   2383: the given map. This is one of the proper ways to get a resource object.
                   2384: 
1.133     bowersj2 2385: =cut
                   2386: 
                   2387: # The strategy here is to cache the resource objects, and only construct them
                   2388: # as we use them. The real point is to prevent reading any more from the tied
1.398     banghart 2389: # hash than we have to, which should hopefully alleviate speed problems.
1.133     bowersj2 2390: 
                   2391: sub getById {
                   2392:     my $self = shift;
                   2393:     my $id = shift;
                   2394: 
                   2395:     if (defined ($self->{RESOURCE_CACHE}->{$id}))
                   2396:     {
                   2397:         return $self->{RESOURCE_CACHE}->{$id};
                   2398:     }
                   2399: 
                   2400:     # resource handles inserting itself into cache.
                   2401:     # Not clear why the quotes are necessary, but as of this
                   2402:     # writing it doesn't work without them.
                   2403:     return "Apache::lonnavmaps::resource"->new($self, $id);
1.132     bowersj2 2404: }
1.133     bowersj2 2405: 
1.172     bowersj2 2406: sub getBySymb {
                   2407:     my $self = shift;
                   2408:     my $symb = shift;
1.277     matthew  2409: 
1.228     albertel 2410:     my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
1.172     bowersj2 2411:     my $map = $self->getResourceByUrl($mapUrl);
1.277     matthew  2412:     my $returnvalue = undef;
                   2413:     if (ref($map)) {
                   2414:         $returnvalue = $self->getById($map->map_pc() .'.'.$id);
                   2415:     }
                   2416:     return $returnvalue;
1.194     bowersj2 2417: }
                   2418: 
                   2419: sub getByMapPc {
                   2420:     my $self = shift;
                   2421:     my $map_pc = shift;
                   2422:     my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
                   2423:     $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
                   2424:     return $self->getById($map_id);
1.172     bowersj2 2425: }
                   2426: 
1.133     bowersj2 2427: =pod
                   2428: 
1.174     albertel 2429: =item * B<firstResource>():
                   2430: 
                   2431: Returns a resource object reference corresponding to the first
                   2432: resource in the navmap.
1.133     bowersj2 2433: 
                   2434: =cut
                   2435: 
                   2436: sub firstResource {
                   2437:     my $self = shift;
                   2438:     my $firstResource = $self->navhash('map_start_' .
1.320     albertel 2439:                      &Apache::lonnet::clutter($env{'request.course.uri'}));
1.133     bowersj2 2440:     return $self->getById($firstResource);
1.132     bowersj2 2441: }
1.133     bowersj2 2442: 
                   2443: =pod
                   2444: 
1.174     albertel 2445: =item * B<finishResource>():
                   2446: 
                   2447: Returns a resource object reference corresponding to the last resource
                   2448: in the navmap.
1.133     bowersj2 2449: 
                   2450: =cut
                   2451: 
                   2452: sub finishResource {
                   2453:     my $self = shift;
                   2454:     my $firstResource = $self->navhash('map_finish_' .
1.320     albertel 2455:                      &Apache::lonnet::clutter($env{'request.course.uri'}));
1.133     bowersj2 2456:     return $self->getById($firstResource);
1.132     bowersj2 2457: }
1.133     bowersj2 2458: 
                   2459: # Parmval reads the parm hash and cascades the lookups. parmval_real does
                   2460: # the actual lookup; parmval caches the results.
                   2461: sub parmval {
                   2462:     my $self = shift;
1.399     albertel 2463:     my ($what,$symb,$recurse)=@_;
1.133     bowersj2 2464:     my $hashkey = $what."|||".$symb;
                   2465: 
                   2466:     if (defined($self->{PARM_CACHE}->{$hashkey})) {
1.411     raeburn  2467:         if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') { 
                   2468:             if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
                   2469:                 if (wantarray) {
                   2470:                     return @{$self->{PARM_CACHE}->{$hashkey}};
                   2471:                 } else {
                   2472:                     return $self->{PARM_CACHE}->{$hashkey}->[0];
                   2473:                 }
                   2474:             }
                   2475:         } else {
                   2476:             return $self->{PARM_CACHE}->{$hashkey};
                   2477:         }
1.133     bowersj2 2478:     }
1.399     albertel 2479:     my $result = $self->parmval_real($what, $symb, $recurse);
1.133     bowersj2 2480:     $self->{PARM_CACHE}->{$hashkey} = $result;
1.405     albertel 2481:     if (wantarray) {
1.411     raeburn  2482:         return @{$result};
1.405     albertel 2483:     }
                   2484:     return $result->[0];
1.132     bowersj2 2485: }
                   2486: 
1.133     bowersj2 2487: sub parmval_real {
                   2488:     my $self = shift;
1.219     albertel 2489:     my ($what,$symb,$recurse) = @_;
1.133     bowersj2 2490: 
1.221     bowersj2 2491:     # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
                   2492:     $self->generate_course_user_opt();
                   2493: 
1.320     albertel 2494:     my $cid=$env{'request.course.id'};
                   2495:     my $csec=$env{'request.course.sec'};
1.350     raeburn  2496:     my $cgroup='';
                   2497:     my @cgrps=split(/:/,$env{'request.course.groups'});
                   2498:     if (@cgrps > 0) {
                   2499:         @cgrps = sort(@cgrps);
                   2500:         $cgroup = $cgrps[0];
                   2501:     } 
1.320     albertel 2502:     my $uname=$env{'user.name'};
                   2503:     my $udom=$env{'user.domain'};
1.133     bowersj2 2504: 
1.405     albertel 2505:     unless ($symb) { return ['']; }
1.133     bowersj2 2506:     my $result='';
                   2507: 
1.226     www      2508:     my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
1.383     albertel 2509:     $mapname = &Apache::lonnet::deversion($mapname);
1.133     bowersj2 2510: # ----------------------------------------------------- Cascading lookup scheme
                   2511:     my $rwhat=$what;
                   2512:     $what=~s/^parameter\_//;
                   2513:     $what=~s/\_/\./;
                   2514: 
                   2515:     my $symbparm=$symb.'.'.$what;
                   2516:     my $mapparm=$mapname.'___(all).'.$what;
1.325     albertel 2517:     my $usercourseprefix=$cid;
1.133     bowersj2 2518: 
1.350     raeburn  2519:     my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
                   2520:     my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
                   2521:     my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
                   2522: 
1.133     bowersj2 2523:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                   2524:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                   2525:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                   2526: 
                   2527:     my $courselevel= $usercourseprefix.'.'.$what;
                   2528:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                   2529:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                   2530: 
                   2531:     my $useropt = $self->{USER_OPT};
                   2532:     my $courseopt = $self->{COURSE_OPT};
                   2533:     my $parmhash = $self->{PARM_HASH};
                   2534: 
                   2535: # ---------------------------------------------------------- first, check user
                   2536:     if ($uname and defined($useropt)) {
1.405     albertel 2537:         if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
                   2538:         if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
                   2539:         if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
1.133     bowersj2 2540:     }
                   2541: 
                   2542: # ------------------------------------------------------- second, check course
1.350     raeburn  2543:     if ($cgroup ne '' and defined($courseopt)) {
1.405     albertel 2544:         if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
                   2545:         if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
                   2546:         if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
1.350     raeburn  2547:     }
                   2548: 
1.133     bowersj2 2549:     if ($csec and defined($courseopt)) {
1.405     albertel 2550:         if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
                   2551:         if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
                   2552:         if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
1.133     bowersj2 2553:     }
                   2554: 
                   2555:     if (defined($courseopt)) {
1.405     albertel 2556:         if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
1.133     bowersj2 2557:     }
                   2558: 
                   2559: # ----------------------------------------------------- third, check map parms
                   2560: 
                   2561:     my $thisparm=$$parmhash{$symbparm};
1.405     albertel 2562:     if (defined($thisparm)) { return [$thisparm,'map']; }
1.133     bowersj2 2563: 
                   2564: # ----------------------------------------------------- fourth , check default
                   2565: 
1.246     albertel 2566:     my $meta_rwhat=$rwhat;
                   2567:     $meta_rwhat=~s/\./_/g;
                   2568:     my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
1.405     albertel 2569:     if (defined($default)) { return [$default,'resource']}
1.246     albertel 2570:     $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
1.405     albertel 2571:     if (defined($default)) { return [$default,'resource']}
1.315     albertel 2572: # --------------------------------------------------- fifth, check more course
                   2573:     if (defined($courseopt)) {
1.405     albertel 2574:         if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
                   2575:         if (defined($$courseopt{$courselevel})) {
                   2576:            my $ret = [$$courseopt{$courselevel},'course'];
                   2577:            return $ret;
                   2578:        }
1.315     albertel 2579:     }
                   2580: # --------------------------------------------------- sixth , cascade up parts
1.133     bowersj2 2581: 
                   2582:     my ($space,@qualifier)=split(/\./,$rwhat);
                   2583:     my $qualifier=join('.',@qualifier);
                   2584:     unless ($space eq '0') {
1.160     albertel 2585: 	my @parts=split(/_/,$space);
                   2586: 	my $id=pop(@parts);
                   2587: 	my $part=join('_',@parts);
                   2588: 	if ($part eq '') { $part='0'; }
1.405     albertel 2589:        my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
                   2590:        if (defined($partgeneral[0])) { return \@partgeneral; }
1.133     bowersj2 2591:     }
1.405     albertel 2592:     if ($recurse) { return []; }
1.399     albertel 2593:     my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
1.405     albertel 2594:     if (defined($pack_def)) { return [$pack_def,'resource']; }
                   2595:     return [''];
1.145     bowersj2 2596: }
                   2597: 
1.174     albertel 2598: =pod
1.145     bowersj2 2599: 
1.352     raeburn  2600: =item * B<getResourceByUrl>(url,multiple):
1.145     bowersj2 2601: 
1.352     raeburn  2602: Retrieves a resource object by URL of the resource, unless the optional
1.398     banghart 2603: multiple parameter is included in which case an array of resource 
1.352     raeburn  2604: objects is returned. If passed a resource object, it will simply return  
                   2605: it, so it is safe to use this method in code like
                   2606: "$res = $navmap->getResourceByUrl($res)"
                   2607: if you're not sure if $res is already an object, or just a URL. If the
                   2608: resource appears multiple times in the course, only the first instance 
                   2609: will be returned (useful for maps), unless the multiple parameter has
                   2610: been included, in which case all instances are returned in an array.
1.174     albertel 2611: 
1.314     albertel 2612: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
1.174     albertel 2613: 
                   2614: The map is a specification of a map to retreive the resources from,
                   2615: either as a url or as an object. The filterFunc is a reference to a
                   2616: function that takes a resource object as its one argument and returns
                   2617: true if the resource should be included, or false if it should not
                   2618: be. If recursive is true, the map will be recursively examined,
                   2619: otherwise it will not be. If bailout is true, the function will return
1.314     albertel 2620: as soon as it finds a resource, if false it will finish. If showall is
                   2621: true it will not hide maps that contain nothing but one other map. By
                   2622: default, the map is the top-level map of the course, filterFunc is a
                   2623: function that always returns 1, recursive is true, bailout is false,
                   2624: showall is false. The resources will be returned in a list containing
                   2625: the resource objects for the corresponding resources, with B<no
                   2626: structure information> in the list; regardless of branching,
                   2627: recursion, etc., it will be a flat list.
1.174     albertel 2628: 
                   2629: Thus, this is suitable for cases where you don't want the structure,
                   2630: just a list of all resources. It is also suitable for finding out how
                   2631: many resources match a given description; for this use, if all you
                   2632: want to know is if I<any> resources match the description, the bailout
                   2633: parameter will allow you to avoid potentially expensive enumeration of
                   2634: all matching resources.
1.145     bowersj2 2635: 
1.318     albertel 2636: =item * B<hasResource>(map, filterFunc, recursive, showall):
1.145     bowersj2 2637: 
1.398     banghart 2638: Convenience method for
1.146     bowersj2 2639: 
1.318     albertel 2640:  scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
1.146     bowersj2 2641: 
1.174     albertel 2642: which will tell whether the map has resources matching the description
                   2643: in the filter function.
1.146     bowersj2 2644: 
1.352     raeburn  2645: =item * B<usedVersion>(url):
                   2646: 
                   2647: Retrieves version infomation for a url. Returns the version (a number, or 
                   2648: the string "mostrecent") for resources which have version information in  
                   2649: the big hash.
                   2650:     
1.145     bowersj2 2651: =cut
                   2652: 
1.277     matthew  2653: 
1.145     bowersj2 2654: sub getResourceByUrl {
                   2655:     my $self = shift;
                   2656:     my $resUrl = shift;
1.352     raeburn  2657:     my $multiple = shift;
1.145     bowersj2 2658: 
                   2659:     if (ref($resUrl)) { return $resUrl; }
                   2660: 
                   2661:     $resUrl = &Apache::lonnet::clutter($resUrl);
                   2662:     my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1.352     raeburn  2663:     if (!$resId) { return ''; }
                   2664:     if ($multiple) {
                   2665:         my @resources = ();
                   2666:         my @resIds = split (/,/, $resId);
                   2667:         foreach my $id (@resIds) {
1.353     raeburn  2668:             my $resourceId = $self->getById($id);
                   2669:             if ($resourceId) { 
                   2670:                 push(@resources,$resourceId);
1.352     raeburn  2671:             }
                   2672:         }
                   2673:         return @resources;
                   2674:     } else {
                   2675:         if ($resId =~ /,/) {
                   2676:             $resId = (split (/,/, $resId))[0];
                   2677:         }
                   2678:         return $self->getById($resId);
1.145     bowersj2 2679:     }
                   2680: }
                   2681: 
                   2682: sub retrieveResources {
                   2683:     my $self = shift;
                   2684:     my $map = shift;
                   2685:     my $filterFunc = shift;
                   2686:     if (!defined ($filterFunc)) {
                   2687:         $filterFunc = sub {return 1;};
                   2688:     }
                   2689:     my $recursive = shift;
                   2690:     if (!defined($recursive)) { $recursive = 1; }
                   2691:     my $bailout = shift;
                   2692:     if (!defined($bailout)) { $bailout = 0; }
1.314     albertel 2693:     my $showall = shift;
1.145     bowersj2 2694:     # Create the necessary iterator.
                   2695:     if (!ref($map)) { # assume it's a url of a map.
1.172     bowersj2 2696:         $map = $self->getResourceByUrl($map);
1.145     bowersj2 2697:     }
                   2698: 
1.213     bowersj2 2699:     # If nothing was passed, assume top-level map
                   2700:     if (!$map) {
                   2701: 	$map = $self->getById('0.0');
                   2702:     }
                   2703: 
1.145     bowersj2 2704:     # Check the map's validity.
1.213     bowersj2 2705:     if (!$map->is_map()) {
1.145     bowersj2 2706:         # Oh, to throw an exception.... how I'd love that!
                   2707:         return ();
                   2708:     }
                   2709: 
1.146     bowersj2 2710:     # Get an iterator.
                   2711:     my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1.314     albertel 2712:                                 undef, $recursive, $showall);
1.146     bowersj2 2713: 
                   2714:     my @resources = ();
                   2715: 
1.400     albertel 2716:     if (&$filterFunc($map)) {
                   2717: 	push(@resources, $map);
                   2718:     }
                   2719: 
1.146     bowersj2 2720:     # Run down the iterator and collect the resources.
1.222     bowersj2 2721:     my $curRes;
                   2722: 
                   2723:     while ($curRes = $it->next()) {
1.146     bowersj2 2724:         if (ref($curRes)) {
                   2725:             if (!&$filterFunc($curRes)) {
                   2726:                 next;
                   2727:             }
                   2728: 
1.400     albertel 2729:             push(@resources, $curRes);
1.146     bowersj2 2730: 
                   2731:             if ($bailout) {
                   2732:                 return @resources;
                   2733:             }
                   2734:         }
                   2735: 
                   2736:     }
                   2737: 
                   2738:     return @resources;
                   2739: }
                   2740: 
                   2741: sub hasResource {
                   2742:     my $self = shift;
                   2743:     my $map = shift;
                   2744:     my $filterFunc = shift;
                   2745:     my $recursive = shift;
1.318     albertel 2746:     my $showall = shift;
1.146     bowersj2 2747:     
1.318     albertel 2748:     return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
1.133     bowersj2 2749: }
1.51      bowersj2 2750: 
1.352     raeburn  2751: sub usedVersion {
                   2752:     my $self = shift;
                   2753:     my $linkurl = shift;
                   2754:     return $self->navhash("version_$linkurl");
                   2755: }
                   2756: 
1.51      bowersj2 2757: 1;
                   2758: 
                   2759: package Apache::lonnavmaps::iterator;
1.365     albertel 2760: use Scalar::Util qw(weaken);
1.320     albertel 2761: use Apache::lonnet;
                   2762: 
1.51      bowersj2 2763: =pod
                   2764: 
                   2765: =back
                   2766: 
1.174     albertel 2767: =head1 Object: navmap Iterator
1.51      bowersj2 2768: 
1.174     albertel 2769: An I<iterator> encapsulates the logic required to traverse a data
                   2770: structure. navmap uses an iterator to traverse the course map
                   2771: according to the criteria you wish to use.
                   2772: 
                   2773: To obtain an iterator, call the B<getIterator>() function of a
                   2774: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
                   2775: directly.) This will return a reference to the iterator:
1.51      bowersj2 2776: 
                   2777: C<my $resourceIterator = $navmap-E<gt>getIterator();>
                   2778: 
                   2779: To get the next thing from the iterator, call B<next>:
                   2780: 
                   2781: C<my $nextThing = $resourceIterator-E<gt>next()>
                   2782: 
                   2783: getIterator behaves as follows:
                   2784: 
                   2785: =over 4
                   2786: 
1.174     albertel 2787: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
                   2788: 
                   2789: All parameters are optional. firstResource is a resource reference
                   2790: corresponding to where the iterator should start. It defaults to
                   2791: navmap->firstResource() for the corresponding nav map. finishResource
                   2792: corresponds to where you want the iterator to end, defaulting to
                   2793: navmap->finishResource(). filterHash is a hash used as a set
                   2794: containing strings representing the resource IDs, defaulting to
                   2795: empty. Condition is a 1 or 0 that sets what to do with the filter
1.205     bowersj2 2796: hash: If a 0, then only resources that exist IN the filterHash will be
1.174     albertel 2797: recursed on. If it is a 1, only resources NOT in the filterHash will
                   2798: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
                   2799: false (default), the iterator will only return the first level of map
                   2800: that is not just a single, 'redirecting' map. If true, the iterator
                   2801: will return all information, starting with the top-level map,
                   2802: regardless of content. returnTopMap, if true (default false), will
                   2803: cause the iterator to return the top-level map object (resource 0.0)
                   2804: before anything else.
                   2805: 
                   2806: Thus, by default, only top-level resources will be shown. Change the
                   2807: condition to a 1 without changing the hash, and all resources will be
                   2808: shown. Changing the condition to 1 and including some values in the
                   2809: hash will allow you to selectively suppress parts of the navmap, while
                   2810: leaving it on 0 and adding things to the hash will allow you to
                   2811: selectively add parts of the nav map. See the handler code for
                   2812: examples.
                   2813: 
                   2814: The iterator will return either a reference to a resource object, or a
                   2815: token representing something in the map, such as the beginning of a
                   2816: new branch. The possible tokens are:
                   2817: 
                   2818: =over 4
1.51      bowersj2 2819: 
1.222     bowersj2 2820: =item * B<END_ITERATOR>:
                   2821: 
                   2822: The iterator has returned all that it's going to. Further calls to the
                   2823: iterator will just produce more of these. This is a "false" value, and
                   2824: is the only false value the iterator which will be returned, so it can
                   2825: be used as a loop sentinel.
                   2826: 
1.217     bowersj2 2827: =item * B<BEGIN_MAP>:
1.51      bowersj2 2828: 
1.174     albertel 2829: A new map is being recursed into. This is returned I<after> the map
                   2830: resource itself is returned.
1.51      bowersj2 2831: 
1.217     bowersj2 2832: =item * B<END_MAP>:
1.174     albertel 2833: 
                   2834: The map is now done.
1.51      bowersj2 2835: 
1.217     bowersj2 2836: =item * B<BEGIN_BRANCH>:
1.70      bowersj2 2837: 
1.174     albertel 2838: A branch is now starting. The next resource returned will be the first
                   2839: in that branch.
1.70      bowersj2 2840: 
1.217     bowersj2 2841: =item * B<END_BRANCH>:
1.70      bowersj2 2842: 
1.174     albertel 2843: The branch is now done.
1.51      bowersj2 2844: 
                   2845: =back
                   2846: 
1.174     albertel 2847: The tokens are retreivable via methods on the iterator object, i.e.,
                   2848: $iterator->END_MAP.
1.70      bowersj2 2849: 
1.174     albertel 2850: Maps can contain empty resources. The iterator will automatically skip
                   2851: over such resources, but will still treat the structure
                   2852: correctly. Thus, a complicated map with several branches, but
                   2853: consisting entirely of empty resources except for one beginning or
                   2854: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
                   2855: but only one resource will be returned.
1.116     bowersj2 2856: 
1.242     matthew  2857: =back
                   2858: 
1.222     bowersj2 2859: =head2 Normal Usage
                   2860: 
                   2861: Normal usage of the iterator object is to do the following:
                   2862: 
                   2863:  my $it = $navmap->getIterator([your params here]);
                   2864:  my $curRes;
                   2865:  while ($curRes = $it->next()) {
                   2866:    [your logic here]
                   2867:  }
                   2868: 
                   2869: Note that inside of the loop, it's frequently useful to check if
                   2870: "$curRes" is a reference or not with the reference function; only
                   2871: resource objects will be references, and any non-references will 
                   2872: be the tokens described above.
                   2873: 
                   2874: Also note there is some old code floating around that trys to track
                   2875: the depth of the iterator to see when it's done; do not copy that 
1.398     banghart 2876: code. It is difficult to get right and harder to understand than
1.222     bowersj2 2877: this. They should be migrated to this new style.
1.51      bowersj2 2878: 
                   2879: =cut
                   2880: 
                   2881: # Here are the tokens for the iterator:
                   2882: 
1.222     bowersj2 2883: sub END_ITERATOR { return 0; }
1.51      bowersj2 2884: sub BEGIN_MAP { return 1; }    # begining of a new map
                   2885: sub END_MAP { return 2; }      # end of the map
                   2886: sub BEGIN_BRANCH { return 3; } # beginning of a branch
                   2887: sub END_BRANCH { return 4; }   # end of a branch
1.89      bowersj2 2888: sub FORWARD { return 1; }      # go forward
                   2889: sub BACKWARD { return 2; }
1.51      bowersj2 2890: 
1.96      bowersj2 2891: sub min {
                   2892:     (my $a, my $b) = @_;
                   2893:     if ($a < $b) { return $a; } else { return $b; }
                   2894: }
                   2895: 
1.94      bowersj2 2896: sub new {
                   2897:     # magic invocation to create a class instance
                   2898:     my $proto = shift;
                   2899:     my $class = ref($proto) || $proto;
                   2900:     my $self = {};
                   2901: 
1.300     albertel 2902:     weaken($self->{NAV_MAP} = shift);
1.94      bowersj2 2903:     return undef unless ($self->{NAV_MAP});
                   2904: 
                   2905:     # Handle the parameters
                   2906:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   2907:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   2908: 
                   2909:     # If the given resources are just the ID of the resource, get the
                   2910:     # objects
                   2911:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   2912:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   2913:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   2914:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   2915: 
                   2916:     $self->{FILTER} = shift;
                   2917: 
                   2918:     # A hash, used as a set, of resource already seen
                   2919:     $self->{ALREADY_SEEN} = shift;
                   2920:     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
                   2921:     $self->{CONDITION} = shift;
                   2922: 
1.116     bowersj2 2923:     # Do we want to automatically follow "redirection" maps?
                   2924:     $self->{FORCE_TOP} = shift;
                   2925: 
1.162     bowersj2 2926:     # Do we want to return the top-level map object (resource 0.0)?
                   2927:     $self->{RETURN_0} = shift;
                   2928:     # have we done that yet?
                   2929:     $self->{HAVE_RETURNED_0} = 0;
                   2930: 
1.94      bowersj2 2931:     # Now, we need to pre-process the map, by walking forward and backward
                   2932:     # over the parts of the map we're going to look at.
1.96      bowersj2 2933: 
1.97      bowersj2 2934:     # The processing steps are exactly the same, except for a few small 
                   2935:     # changes, so I bundle those up in the following list of two elements:
                   2936:     # (direction_to_iterate, VAL_name, next_resource_method_to_call,
                   2937:     # first_resource).
                   2938:     # This prevents writing nearly-identical code twice.
                   2939:     my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', 
                   2940:                         'FIRST_RESOURCE'],
                   2941:                        [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', 
                   2942:                         'FINISH_RESOURCE'] );
                   2943: 
1.98      bowersj2 2944:     my $maxDepth = 0; # tracks max depth
                   2945: 
1.116     bowersj2 2946:     # If there is only one resource in this map, and it's a map, we
                   2947:     # want to remember that, so the user can ask for the first map
                   2948:     # that isn't just a redirector.
                   2949:     my $resource; my $resourceCount = 0;
                   2950: 
1.209     bowersj2 2951:     # Documentation on this algorithm can be found in the CVS repository at 
                   2952:     # /docs/lonnavdocs; these "**#**" markers correspond to documentation
                   2953:     # in that file.
1.107     bowersj2 2954:     # **1**
                   2955: 
1.97      bowersj2 2956:     foreach my $pass (@iterations) {
                   2957:         my $direction = $pass->[0];
                   2958:         my $valName = $pass->[1];
                   2959:         my $nextResourceMethod = $pass->[2];
                   2960:         my $firstResourceName = $pass->[3];
                   2961: 
                   2962:         my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, 
                   2963:                                                             $self->{FIRST_RESOURCE},
                   2964:                                                             $self->{FINISH_RESOURCE},
                   2965:                                                             {}, undef, 0, $direction);
1.96      bowersj2 2966:     
1.97      bowersj2 2967:         # prime the recursion
                   2968:         $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.222     bowersj2 2969: 	$iterator->next();
1.97      bowersj2 2970:         my $curRes = $iterator->next();
1.222     bowersj2 2971: 	my $depth = 1;
                   2972:         while ($depth > 0) {
                   2973: 	    if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
                   2974: 	    if ($curRes == $iterator->END_MAP()) { $depth--; }
                   2975: 
1.97      bowersj2 2976:             if (ref($curRes)) {
1.116     bowersj2 2977:                 # If there's only one resource, this will save it
1.117     bowersj2 2978:                 # we have to filter empty resources from consideration here,
                   2979:                 # or even "empty", redirecting maps have two (start & finish)
                   2980:                 # or three (start, finish, plus redirector)
                   2981:                 if($direction == FORWARD && $curRes->src()) { 
                   2982:                     $resource = $curRes; $resourceCount++; 
                   2983:                 }
1.97      bowersj2 2984:                 my $resultingVal = $curRes->{DATA}->{$valName};
                   2985:                 my $nextResources = $curRes->$nextResourceMethod();
1.116     bowersj2 2986:                 my $nextCount = scalar(@{$nextResources});
1.104     bowersj2 2987: 
1.116     bowersj2 2988:                 if ($nextCount == 1) { # **3**
1.97      bowersj2 2989:                     my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                   2990:                     $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                   2991:                 }
                   2992:                 
1.116     bowersj2 2993:                 if ($nextCount > 1) { # **4**
1.97      bowersj2 2994:                     foreach my $res (@{$nextResources}) {
                   2995:                         my $current = $res->{DATA}->{$valName} || 999999999;
                   2996:                         $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
                   2997:                     }
                   2998:                 }
                   2999:             }
1.96      bowersj2 3000:             
1.107     bowersj2 3001:             # Assign the final val (**2**)
1.97      bowersj2 3002:             if (ref($curRes) && $direction == BACKWARD()) {
1.98      bowersj2 3003:                 my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
                   3004:                                      $curRes->{DATA}->{BOT_UP_VAL});
                   3005:                 
                   3006:                 $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
                   3007:                 if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190     bowersj2 3008:             }
1.222     bowersj2 3009: 
                   3010: 	    $curRes = $iterator->next();
1.96      bowersj2 3011:         }
                   3012:     }
1.94      bowersj2 3013: 
1.116     bowersj2 3014:     # Check: Was this only one resource, a map?
1.255     albertel 3015:     if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) { 
1.116     bowersj2 3016:         my $firstResource = $resource->map_start();
                   3017:         my $finishResource = $resource->map_finish();
                   3018:         return 
                   3019:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   3020:                                               $finishResource, $self->{FILTER},
                   3021:                                               $self->{ALREADY_SEEN}, 
1.314     albertel 3022:                                               $self->{CONDITION},
                   3023: 					      $self->{FORCE_TOP});
1.116     bowersj2 3024:         
                   3025:     }
                   3026: 
1.98      bowersj2 3027:     # Set up some bookkeeping information.
                   3028:     $self->{CURRENT_DEPTH} = 0;
                   3029:     $self->{MAX_DEPTH} = $maxDepth;
                   3030:     $self->{STACK} = [];
                   3031:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1.222     bowersj2 3032:     $self->{FINISHED} = 0; # When true, the iterator has finished
1.98      bowersj2 3033: 
                   3034:     for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
                   3035:         push @{$self->{STACK}}, [];
                   3036:     }
                   3037: 
1.107     bowersj2 3038:     # Prime the recursion w/ the first resource **5**
1.98      bowersj2 3039:     push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
                   3040:     $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
                   3041: 
                   3042:     bless ($self);
                   3043: 
                   3044:     return $self;
                   3045: }
                   3046: 
                   3047: sub next {
                   3048:     my $self = shift;
1.256     albertel 3049:     my $closeAllPages=shift;
1.222     bowersj2 3050:     if ($self->{FINISHED}) {
                   3051: 	return END_ITERATOR();
                   3052:     }
                   3053: 
1.162     bowersj2 3054:     # If we want to return the top-level map object, and haven't yet,
                   3055:     # do so.
                   3056:     if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
                   3057:         $self->{HAVE_RETURNED_0} = 1;
                   3058:         return $self->{NAV_MAP}->getById('0.0');
                   3059:     }
1.401     albertel 3060:     if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
                   3061: 	$self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
                   3062: 	return $self->BEGIN_MAP();
                   3063:     }
1.98      bowersj2 3064: 
                   3065:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3066:         # grab the next from the recursive iterator 
1.256     albertel 3067:         my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
1.98      bowersj2 3068: 
                   3069:         # is it a begin or end map? If so, update the depth
                   3070:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   3071:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   3072: 
                   3073:         # Are we back at depth 0? If so, stop recursing
                   3074:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   3075:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3076:         }
                   3077: 
                   3078:         return $next;
                   3079:     }
                   3080: 
                   3081:     if (defined($self->{FORCE_NEXT})) {
                   3082:         my $tmp = $self->{FORCE_NEXT};
                   3083:         $self->{FORCE_NEXT} = undef;
                   3084:         return $tmp;
                   3085:     }
                   3086: 
                   3087:     # Have we not yet begun? If not, return BEGIN_MAP and
                   3088:     # remember we've started.
                   3089:     if ( !$self->{STARTED} ) { 
                   3090:         $self->{STARTED} = 1;
                   3091:         return $self->BEGIN_MAP();
                   3092:     }
                   3093: 
                   3094:     # Here's the guts of the iterator.
                   3095:     
                   3096:     # Find the next resource, if any.
                   3097:     my $found = 0;
                   3098:     my $i = $self->{MAX_DEPTH};
                   3099:     my $newDepth;
                   3100:     my $here;
                   3101:     while ( $i >= 0 && !$found ) {
1.107     bowersj2 3102:         if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
                   3103:             $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98      bowersj2 3104:             $found = 1;
                   3105:             $newDepth = $i;
                   3106:         }
                   3107:         $i--;
                   3108:     }
                   3109: 
                   3110:     # If we still didn't find anything, we're done.
                   3111:     if ( !$found ) {
                   3112:         # We need to get back down to the correct branch depth
                   3113:         if ( $self->{CURRENT_DEPTH} > 0 ) {
                   3114:             $self->{CURRENT_DEPTH}--;
                   3115:             return END_BRANCH();
                   3116:         } else {
1.222     bowersj2 3117: 	    $self->{FINISHED} = 1;
1.98      bowersj2 3118:             return END_MAP();
                   3119:         }
                   3120:     }
                   3121: 
1.104     bowersj2 3122:     # If this is not a resource, it must be an END_BRANCH marker we want
                   3123:     # to return directly.
1.107     bowersj2 3124:     if (!ref($here)) { # **8**
1.104     bowersj2 3125:         if ($here == END_BRANCH()) { # paranoia, in case of later extension
                   3126:             $self->{CURRENT_DEPTH}--;
                   3127:             return $here;
                   3128:         }
                   3129:     }
                   3130: 
                   3131:     # Otherwise, it is a resource and it's safe to store in $self->{HERE}
                   3132:     $self->{HERE} = $here;
                   3133: 
1.98      bowersj2 3134:     # Get to the right level
                   3135:     if ( $self->{CURRENT_DEPTH} > $newDepth ) {
                   3136:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3137:         $self->{CURRENT_DEPTH}--;
                   3138:         return END_BRANCH();
                   3139:     }
                   3140:     if ( $self->{CURRENT_DEPTH} < $newDepth) {
                   3141:         push @{$self->{STACK}->[$newDepth]}, $here;
                   3142:         $self->{CURRENT_DEPTH}++;
                   3143:         return BEGIN_BRANCH();
                   3144:     }
                   3145: 
                   3146:     # If we made it here, we have the next resource, and we're at the
                   3147:     # right branch level. So let's examine the resource for where
                   3148:     # we can get to from here.
                   3149: 
                   3150:     # So we need to look at all the resources we can get to from here,
                   3151:     # categorize them if we haven't seen them, remember if we have a new
                   3152:     my $nextUnfiltered = $here->getNext();
1.104     bowersj2 3153:     my $maxDepthAdded = -1;
                   3154:     
1.98      bowersj2 3155:     for (@$nextUnfiltered) {
                   3156:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104     bowersj2 3157:             my $depth = $_->{DATA}->{DISPLAY_DEPTH};
                   3158:             push @{$self->{STACK}->[$depth]}, $_;
1.98      bowersj2 3159:             $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104     bowersj2 3160:             if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98      bowersj2 3161:         }
                   3162:     }
1.104     bowersj2 3163: 
                   3164:     # Is this the end of a branch? If so, all of the resources examined above
1.398     banghart 3165:     # led to lower levels than the one we are currently at, so we push a END_BRANCH
1.104     bowersj2 3166:     # marker onto the stack so we don't forget.
                   3167:     # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
                   3168:     # BC branch and gets to C, it will see F as the only next resource, but it's
                   3169:     # one level lower. Thus, this is the end of the branch, since there are no
                   3170:     # more resources added to this level or above.
1.111     bowersj2 3171:     # We don't do this if the examined resource is the finish resource,
                   3172:     # because the condition given above is true, but the "END_MAP" will
                   3173:     # take care of things and we should already be at depth 0.
1.104     bowersj2 3174:     my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111     bowersj2 3175:     if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104     bowersj2 3176:         push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
                   3177:     }
                   3178: 
1.98      bowersj2 3179:     # That ends the main iterator logic. Now, do we want to recurse
                   3180:     # down this map (if this resource is a map)?
1.256     albertel 3181:     if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
1.98      bowersj2 3182:         (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
                   3183:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3184:         my $firstResource = $self->{HERE}->map_start();
                   3185:         my $finishResource = $self->{HERE}->map_finish();
                   3186: 
                   3187:         $self->{RECURSIVE_ITERATOR} = 
                   3188:             Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                   3189:                                               $finishResource, $self->{FILTER},
1.314     albertel 3190:                                               $self->{ALREADY_SEEN},
                   3191: 					      $self->{CONDITION},
                   3192: 					      $self->{FORCE_TOP});
1.98      bowersj2 3193:     }
                   3194: 
1.116     bowersj2 3195:     # If this is a blank resource, don't actually return it.
1.117     bowersj2 3196:     # Should you ever find you need it, make sure to add an option to the code
                   3197:     #  that you can use; other things depend on this behavior.
1.138     bowersj2 3198:     my $browsePriv = $self->{HERE}->browsePriv();
                   3199:     if (!$self->{HERE}->src() || 
                   3200:         (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.256     albertel 3201:         return $self->next($closeAllPages);
1.116     bowersj2 3202:     }
                   3203: 
1.98      bowersj2 3204:     return $self->{HERE};
                   3205: 
                   3206: }
                   3207: 
                   3208: =pod
                   3209: 
1.174     albertel 3210: The other method available on the iterator is B<getStack>, which
                   3211: returns an array populated with the current 'stack' of maps, as
                   3212: references to the resource objects. Example: This is useful when
                   3213: making the navigation map, as we need to check whether we are under a
                   3214: page map to see if we need to link directly to the resource, or to the
                   3215: page. The first elements in the array will correspond to the top of
                   3216: the stack (most inclusive map).
1.98      bowersj2 3217: 
                   3218: =cut
                   3219: 
                   3220: sub getStack {
                   3221:     my $self=shift;
                   3222: 
                   3223:     my @stack;
                   3224: 
                   3225:     $self->populateStack(\@stack);
                   3226: 
                   3227:     return \@stack;
                   3228: }
                   3229: 
                   3230: # Private method: Calls the iterators recursively to populate the stack.
                   3231: sub populateStack {
                   3232:     my $self=shift;
                   3233:     my $stack = shift;
                   3234: 
                   3235:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3236: 
                   3237:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3238:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3239:     }
1.94      bowersj2 3240: }
                   3241: 
                   3242: 1;
                   3243: 
                   3244: package Apache::lonnavmaps::DFSiterator;
1.365     albertel 3245: use Scalar::Util qw(weaken);
1.320     albertel 3246: use Apache::lonnet;
                   3247: 
1.100     bowersj2 3248: # Not documented in the perldoc: This is a simple iterator that just walks
                   3249: #  through the nav map and presents the resources in a depth-first search
                   3250: #  fashion, ignorant of conditionals, randomized resources, etc. It presents
                   3251: #  BEGIN_MAP and END_MAP, but does not understand branches at all. It is
                   3252: #  useful for pre-processing of some kind, and is in fact used by the main
                   3253: #  iterator that way, but that's about it.
                   3254: # One could imagine merging this into the init routine of the main iterator,
1.251     www      3255: #  but this might as well be left separate, since it is possible some other
1.100     bowersj2 3256: #  use might be found for it. - Jeremy
1.94      bowersj2 3257: 
1.117     bowersj2 3258: # Unlike the main iterator, this DOES return all resources, even blank ones.
                   3259: #  The main iterator needs them to correctly preprocess the map.
                   3260: 
1.94      bowersj2 3261: sub BEGIN_MAP { return 1; }    # begining of a new map
                   3262: sub END_MAP { return 2; }      # end of the map
                   3263: sub FORWARD { return 1; }      # go forward
                   3264: sub BACKWARD { return 2; }
                   3265: 
1.100     bowersj2 3266: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
                   3267: #         filter hash ref (or undef), already seen hash or undef, condition
                   3268: #         (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51      bowersj2 3269: sub new {
                   3270:     # magic invocation to create a class instance
                   3271:     my $proto = shift;
                   3272:     my $class = ref($proto) || $proto;
                   3273:     my $self = {};
                   3274: 
1.300     albertel 3275:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3276:     return undef unless ($self->{NAV_MAP});
                   3277: 
                   3278:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   3279:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   3280: 
                   3281:     # If the given resources are just the ID of the resource, get the
                   3282:     # objects
                   3283:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   3284:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   3285:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   3286:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   3287: 
                   3288:     $self->{FILTER} = shift;
                   3289: 
                   3290:     # A hash, used as a set, of resource already seen
                   3291:     $self->{ALREADY_SEEN} = shift;
1.140     bowersj2 3292:      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63      bowersj2 3293:     $self->{CONDITION} = shift;
1.89      bowersj2 3294:     $self->{DIRECTION} = shift || FORWARD();
1.51      bowersj2 3295: 
1.100     bowersj2 3296:     # Flag: Have we started yet?
1.51      bowersj2 3297:     $self->{STARTED} = 0;
                   3298: 
                   3299:     # Should we continue calling the recursive iterator, if any?
                   3300:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3301:     # The recursive iterator, if any
                   3302:     $self->{RECURSIVE_ITERATOR} = undef;
                   3303:     # Are we recursing on a map, or a branch?
                   3304:     $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
                   3305:     # And the count of how deep it is, so that this iterator can keep track of
                   3306:     # when to pick back up again.
                   3307:     $self->{RECURSIVE_DEPTH} = 0;
                   3308: 
                   3309:     # For keeping track of our branches, we maintain our own stack
1.100     bowersj2 3310:     $self->{STACK} = [];
1.51      bowersj2 3311: 
                   3312:     # Start with the first resource
1.89      bowersj2 3313:     if ($self->{DIRECTION} == FORWARD) {
1.100     bowersj2 3314:         push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89      bowersj2 3315:     } else {
1.100     bowersj2 3316:         push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89      bowersj2 3317:     }
1.51      bowersj2 3318: 
                   3319:     bless($self);
                   3320:     return $self;
                   3321: }
                   3322: 
                   3323: sub next {
                   3324:     my $self = shift;
                   3325:     
                   3326:     # Are we using a recursive iterator? If so, pull from that and
                   3327:     # watch the depth; we want to resume our level at the correct time.
1.98      bowersj2 3328:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51      bowersj2 3329:         # grab the next from the recursive iterator
                   3330:         my $next = $self->{RECURSIVE_ITERATOR}->next();
                   3331:         
                   3332:         # is it a begin or end map? Update depth if so
                   3333:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   3334:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   3335: 
                   3336:         # Are we back at depth 0? If so, stop recursing.
                   3337:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   3338:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   3339:         }
                   3340:         
                   3341:         return $next;
                   3342:     }
                   3343: 
                   3344:     # Is there a current resource to grab? If not, then return
1.100     bowersj2 3345:     # END_MAP, which will end the iterator.
                   3346:     if (scalar(@{$self->{STACK}}) == 0) {
                   3347:         return $self->END_MAP();
1.51      bowersj2 3348:     }
                   3349: 
                   3350:     # Have we not yet begun? If not, return BEGIN_MAP and 
                   3351:     # remember that we've started.
                   3352:     if ( !$self->{STARTED} ) {
                   3353:         $self->{STARTED} = 1;
                   3354:         return $self->BEGIN_MAP;
                   3355:     }
                   3356: 
                   3357:     # Get the next resource in the branch
1.100     bowersj2 3358:     $self->{HERE} = pop @{$self->{STACK}};
1.52      bowersj2 3359: 
1.100     bowersj2 3360:     # remember that we've seen this, so we don't return it again later
1.51      bowersj2 3361:     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
                   3362:     
                   3363:     # Get the next possible resources
1.90      bowersj2 3364:     my $nextUnfiltered;
1.89      bowersj2 3365:     if ($self->{DIRECTION} == FORWARD()) {
1.90      bowersj2 3366:         $nextUnfiltered = $self->{HERE}->getNext();
1.89      bowersj2 3367:     } else {
1.90      bowersj2 3368:         $nextUnfiltered = $self->{HERE}->getPrevious();
1.89      bowersj2 3369:     }
1.51      bowersj2 3370:     my $next = [];
                   3371: 
                   3372:     # filter the next possibilities to remove things we've 
1.100     bowersj2 3373:     # already seen.
1.394     raeburn  3374:     foreach my $item (@$nextUnfiltered) {
                   3375:         if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
                   3376:             push @$next, $item;
1.52      bowersj2 3377:         }
1.51      bowersj2 3378:     }
                   3379: 
                   3380:     while (@$next) {
1.100     bowersj2 3381:         # copy the next possibilities over to the stack
                   3382:         push @{$self->{STACK}}, shift @$next;
1.51      bowersj2 3383:     }
                   3384: 
                   3385:     # If this is a map and we want to recurse down it... (not filtered out)
1.70      bowersj2 3386:     if ($self->{HERE}->is_map() && 
1.63      bowersj2 3387:          (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { 
1.51      bowersj2 3388:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   3389:         my $firstResource = $self->{HERE}->map_start();
                   3390:         my $finishResource = $self->{HERE}->map_finish();
                   3391: 
                   3392:         $self->{RECURSIVE_ITERATOR} =
1.94      bowersj2 3393:           Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, 
1.63      bowersj2 3394:                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91      bowersj2 3395:                                              $self->{CONDITION}, $self->{DIRECTION});
1.51      bowersj2 3396:     }
                   3397: 
                   3398:     return $self->{HERE};
1.190     bowersj2 3399: }
                   3400: 
                   3401: # Identical to the full iterator methods of the same name. Hate to copy/paste
                   3402: # but I also hate to "inherit" either iterator from the other.
                   3403: 
                   3404: sub getStack {
                   3405:     my $self=shift;
                   3406: 
                   3407:     my @stack;
                   3408: 
                   3409:     $self->populateStack(\@stack);
                   3410: 
                   3411:     return \@stack;
                   3412: }
                   3413: 
                   3414: # Private method: Calls the iterators recursively to populate the stack.
                   3415: sub populateStack {
                   3416:     my $self=shift;
                   3417:     my $stack = shift;
                   3418: 
                   3419:     push @$stack, $self->{HERE} if ($self->{HERE});
                   3420: 
                   3421:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   3422:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   3423:     }
1.51      bowersj2 3424: }
                   3425: 
1.1       www      3426: 1;
1.2       www      3427: 
1.51      bowersj2 3428: package Apache::lonnavmaps::resource;
1.365     albertel 3429: use Scalar::Util qw(weaken);
1.51      bowersj2 3430: use Apache::lonnet;
                   3431: 
                   3432: =pod
                   3433: 
1.217     bowersj2 3434: =head1 Object: resource 
1.51      bowersj2 3435: 
1.217     bowersj2 3436: X<resource, navmap object>
1.174     albertel 3437: A resource object encapsulates a resource in a resource map, allowing
                   3438: easy manipulation of the resource, querying the properties of the
                   3439: resource (including user properties), and represents a reference that
                   3440: can be used as the canonical representation of the resource by
                   3441: lonnavmap clients like renderers.
                   3442: 
                   3443: A resource only makes sense in the context of a navmap, as some of the
                   3444: data is stored in the navmap object.
                   3445: 
                   3446: You will probably never need to instantiate this object directly. Use
                   3447: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
                   3448: starting resource.
1.51      bowersj2 3449: 
1.188     bowersj2 3450: Resource objects respect the parameter_hiddenparts, which suppresses 
                   3451: various parts according to the wishes of the map author. As of this
                   3452: writing, there is no way to override this parameter, and suppressed
                   3453: parts will never be returned, nor will their response types or ids be
                   3454: stored.
                   3455: 
1.217     bowersj2 3456: =head2 Overview
1.51      bowersj2 3457: 
1.217     bowersj2 3458: A B<Resource> is the most granular type of object in LON-CAPA that can
                   3459: be included in a course. It can either be a particular resource, like
                   3460: an HTML page, external resource, problem, etc., or it can be a
                   3461: container sequence, such as a "page" or a "map".
                   3462: 
                   3463: To see a sequence from the user's point of view, please see the
                   3464: B<Creating a Course: Maps and Sequences> chapter of the Author's
                   3465: Manual.
                   3466: 
                   3467: A Resource Object, once obtained from a navmap object via a B<getBy*>
                   3468: method of the navmap, or from an iterator, allows you to query
                   3469: information about that resource.
                   3470: 
                   3471: Generally, you do not ever want to create a resource object yourself,
                   3472: so creation has been left undocumented. Always retrieve resources
                   3473: from navmap objects.
                   3474: 
                   3475: =head3 Identifying Resources
                   3476: 
                   3477: X<big hash>Every resource is identified by a Resource ID in the big hash that is
                   3478: unique to that resource for a given course. X<resource ID, in big hash>
                   3479: The Resource ID has the form #.#, where the first number is the same
                   3480: for every resource in a map, and the second is unique. For instance,
                   3481: for a course laid out like this:
                   3482: 
                   3483:  * Problem 1
                   3484:  * Map
                   3485:    * Resource 2
                   3486:    * Resource 3
                   3487: 
                   3488: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
                   3489: C<Resource 3> will share a first number. The second number may end up
                   3490: re-used between the two groups.
                   3491: 
                   3492: The resource ID is only used in the big hash, but can be used in the
                   3493: context of a course to identify a resource easily. (For instance, the
                   3494: printing system uses it to record which resources from a sequence you 
                   3495: wish to print.)
                   3496: 
                   3497: X<symb> X<resource, symb>
                   3498: All resources also have B<symb>s, which uniquely identify a resource
                   3499: in a course. Many internal LON-CAPA functions expect a symb. A symb
                   3500: carries along with it the URL of the resource, and the map it appears
1.398     banghart 3501: in. Symbs are much larger than resource IDs.
1.51      bowersj2 3502: 
                   3503: =cut
                   3504: 
                   3505: sub new {
                   3506:     # magic invocation to create a class instance
                   3507:     my $proto = shift;
                   3508:     my $class = ref($proto) || $proto;
                   3509:     my $self = {};
                   3510: 
1.300     albertel 3511:     weaken($self->{NAV_MAP} = shift);
1.51      bowersj2 3512:     $self->{ID} = shift;
                   3513: 
                   3514:     # Store this new resource in the parent nav map's cache.
                   3515:     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66      bowersj2 3516:     $self->{RESOURCE_ERROR} = 0;
1.51      bowersj2 3517: 
                   3518:     # A hash that can be used by two-pass algorithms to store data
                   3519:     # about this resource in. Not used by the resource object
                   3520:     # directly.
                   3521:     $self->{DATA} = {};
                   3522:    
                   3523:     bless($self);
                   3524:     
                   3525:     return $self;
                   3526: }
                   3527: 
1.70      bowersj2 3528: # private function: simplify the NAV_HASH lookups we keep doing
                   3529: # pass the name, and to automatically append my ID, pass a true val on the
                   3530: # second param
                   3531: sub navHash {
                   3532:     my $self = shift;
                   3533:     my $param = shift;
                   3534:     my $id = shift;
1.115     bowersj2 3535:     return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70      bowersj2 3536: }
                   3537: 
1.51      bowersj2 3538: =pod
                   3539: 
1.217     bowersj2 3540: =head2 Methods
1.70      bowersj2 3541: 
1.217     bowersj2 3542: Once you have a resource object, here's what you can do with it:
                   3543: 
                   3544: =head3 Attribute Retrieval
                   3545: 
                   3546: Every resource has certain attributes that can be retrieved and used:
1.70      bowersj2 3547: 
                   3548: =over 4
                   3549: 
1.217     bowersj2 3550: =item * B<ID>: Every resource has an ID that is unique for that
                   3551:     resource in the course it is in. The ID is actually in the hash
                   3552:     representing the resource, so for a resource object $res, obtain
                   3553:     it via C<$res->{ID}).
                   3554: 
1.174     albertel 3555: =item * B<compTitle>:
                   3556: 
                   3557: Returns a "composite title", that is equal to $res->title() if the
                   3558: resource has a title, and is otherwise the last part of the URL (e.g.,
                   3559: "problem.problem").
                   3560: 
                   3561: =item * B<ext>:
                   3562: 
                   3563: Returns true if the resource is external.
                   3564: 
                   3565: =item * B<kind>:
                   3566: 
                   3567: Returns the kind of the resource from the compiled nav map.
                   3568: 
                   3569: =item * B<randomout>:
1.106     bowersj2 3570: 
1.174     albertel 3571: Returns true if this resource was chosen to NOT be shown to the user
                   3572: by the random map selection feature. In other words, this is usually
                   3573: false.
1.70      bowersj2 3574: 
1.174     albertel 3575: =item * B<randompick>:
1.70      bowersj2 3576: 
1.400     albertel 3577: Returns the number of randomly picked items for a map if the randompick
                   3578: feature is being used on the map. 
                   3579: 
                   3580: =item * B<randomorder>:
                   3581: 
                   3582: Returns true for a map if the randomorder feature is being used on the
                   3583: map.
1.70      bowersj2 3584: 
1.174     albertel 3585: =item * B<src>:
1.51      bowersj2 3586: 
1.174     albertel 3587: Returns the source for the resource.
1.70      bowersj2 3588: 
1.174     albertel 3589: =item * B<symb>:
1.70      bowersj2 3590: 
1.174     albertel 3591: Returns the symb for the resource.
1.70      bowersj2 3592: 
1.174     albertel 3593: =item * B<title>:
1.70      bowersj2 3594: 
1.174     albertel 3595: Returns the title of the resource.
                   3596: 
1.51      bowersj2 3597: =back
                   3598: 
                   3599: =cut
                   3600: 
                   3601: # These info functions can be used directly, as they don't return
                   3602: # resource information.
1.85      bowersj2 3603: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.303     albertel 3604: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
1.70      bowersj2 3605: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85      bowersj2 3606: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.217     bowersj2 3607: # considered private and undocumented
1.51      bowersj2 3608: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
                   3609: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68      bowersj2 3610: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
                   3611: sub randompick { 
                   3612:     my $self = shift;
1.410     raeburn  3613:     my $randompick = $self->parmval('randompick');
                   3614:     return $randompick;
1.68      bowersj2 3615: }
1.400     albertel 3616: sub randomorder { 
                   3617:     my $self = shift;
1.410     raeburn  3618:     my $randomorder = $self->parmval('randomorder');
                   3619:     return ($randomorder =~ /^yes$/i);
1.400     albertel 3620: }
1.303     albertel 3621: sub link {
                   3622:     my $self=shift;
                   3623:     if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
                   3624:     return $self->src;
                   3625: }
1.51      bowersj2 3626: sub src { 
                   3627:     my $self=shift;
                   3628:     return $self->navHash("src_", 1);
                   3629: }
1.303     albertel 3630: sub shown_symb {
                   3631:     my $self=shift;
                   3632:     if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
                   3633:     return $self->symb();
                   3634: }
1.328     www      3635: sub id {
                   3636:     my $self=shift;
                   3637:     return $self->{ID};
                   3638: }
                   3639: sub enclosing_map_src {
                   3640:     my $self=shift;
                   3641:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3642:     return $self->navHash('map_id_'.$first);
                   3643: }
1.51      bowersj2 3644: sub symb {
                   3645:     my $self=shift;
                   3646:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   3647:     my $symbSrc = &Apache::lonnet::declutter($self->src());
1.223     albertel 3648:     my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first)) 
1.51      bowersj2 3649:         . '___' . $second . '___' . $symbSrc;
1.223     albertel 3650:     return &Apache::lonnet::symbclean($symb);
1.51      bowersj2 3651: }
1.321     raeburn  3652: sub wrap_symb {
                   3653:     my $self = shift;
                   3654:     return $self->{NAV_MAP}->wrap_symb($self->symb());
                   3655: }
1.213     bowersj2 3656: sub title { 
                   3657:     my $self=shift; 
                   3658:     if ($self->{ID} eq '0.0') {
                   3659: 	# If this is the top-level map, return the title of the course
                   3660: 	# since this map can not be titled otherwise.
1.320     albertel 3661: 	return $env{'course.'.$env{'request.course.id'}.'.description'};
1.213     bowersj2 3662:     }
                   3663:     return $self->navHash("title_", 1); }
1.217     bowersj2 3664: # considered private and undocumented
1.70      bowersj2 3665: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.301     albertel 3666: sub condition {
                   3667:     my $self=shift;
                   3668:     my $undercond=$self->navHash("undercond_", 1);
                   3669:     if (!defined($undercond)) { return 1; };
                   3670:     my $condid=$self->navHash("condid_$undercond");
                   3671:     if (!defined($condid)) { return 1; };
                   3672:     my $condition=&Apache::lonnet::directcondval($condid);
                   3673:     return $condition;
                   3674: }
1.342     albertel 3675: sub condval {
                   3676:     my $self=shift;
1.359     albertel 3677:     my ($pathname,$filename) = 
                   3678: 	&Apache::lonnet::split_uri_for_cond($self->src());
1.342     albertel 3679: 
                   3680:     my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
                   3681: 	       /\&\Q$filename\E\:([\d\|]+)\&/);
                   3682:     if ($match) {
                   3683: 	return &Apache::lonnet::condval($1);
                   3684:     }
                   3685:     return 0;
                   3686: }
1.106     bowersj2 3687: sub compTitle {
                   3688:     my $self = shift;
                   3689:     my $title = $self->title();
1.176     www      3690:     $title=~s/\&colon\;/\:/gs;
1.106     bowersj2 3691:     if (!$title) {
                   3692:         $title = $self->src();
                   3693:         $title = substr($title, rindex($title, '/') + 1);
                   3694:     }
                   3695:     return $title;
                   3696: }
1.399     albertel 3697: 
1.70      bowersj2 3698: =pod
                   3699: 
                   3700: B<Predicate Testing the Resource>
                   3701: 
                   3702: These methods are shortcuts to deciding if a given resource has a given property.
                   3703: 
                   3704: =over 4
                   3705: 
1.174     albertel 3706: =item * B<is_map>:
                   3707: 
                   3708: Returns true if the resource is a map type.
                   3709: 
                   3710: =item * B<is_problem>:
1.70      bowersj2 3711: 
1.174     albertel 3712: Returns true if the resource is a problem type, false
                   3713: otherwise. (Looks at the extension on the src field; might need more
                   3714: to work correctly.)
1.70      bowersj2 3715: 
1.174     albertel 3716: =item * B<is_page>:
1.70      bowersj2 3717: 
1.174     albertel 3718: Returns true if the resource is a page.
                   3719: 
                   3720: =item * B<is_sequence>:
                   3721: 
                   3722: Returns true if the resource is a sequence.
1.70      bowersj2 3723: 
                   3724: =back
                   3725: 
                   3726: =cut
                   3727: 
1.256     albertel 3728: sub hasResource {
                   3729:    my $self = shift;
                   3730:    return $self->{NAV_MAP}->hasResource(@_);
                   3731: }
                   3732: 
                   3733: sub retrieveResources {
                   3734:    my $self = shift;
                   3735:    return $self->{NAV_MAP}->retrieveResources(@_);
                   3736: }
1.70      bowersj2 3737: 
1.369     albertel 3738: sub is_exam {
                   3739:     my ($self,$part) = @_;
1.410     raeburn  3740:     my $type = $self->parmval('type',$part);
                   3741:     if ($type eq 'exam') {
1.369     albertel 3742:         return 1;
                   3743:     }
                   3744:     if ($self->src() =~ /\.(exam)$/) {
                   3745:         return 1;
                   3746:     }
                   3747:     return 0;
                   3748: }
1.70      bowersj2 3749: sub is_html {
1.51      bowersj2 3750:     my $self=shift;
                   3751:     my $src = $self->src();
1.70      bowersj2 3752:     return ($src =~ /html$/);
1.51      bowersj2 3753: }
1.70      bowersj2 3754: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
                   3755: sub is_page {
1.51      bowersj2 3756:     my $self=shift;
                   3757:     my $src = $self->src();
1.205     bowersj2 3758:     return $self->navHash("is_map_", 1) && 
                   3759: 	$self->navHash("map_type_" . $self->map_pc()) eq 'page';
1.51      bowersj2 3760: }
1.361     albertel 3761: sub is_practice {
                   3762:     my $self=shift;
                   3763:     my ($part) = @_;
1.410     raeburn  3764:     my $type = $self->parmval('type',$part);
                   3765:     if ($type eq 'practice') {
1.361     albertel 3766:         return 1;
                   3767:     }
                   3768:     return 0;
                   3769: }
1.70      bowersj2 3770: sub is_problem {
1.51      bowersj2 3771:     my $self=shift;
                   3772:     my $src = $self->src();
1.361     albertel 3773:     if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
                   3774: 	return !($self->is_practice());
                   3775:     }
                   3776:     return 0;
1.256     albertel 3777: }
1.413     www      3778: sub is_raw_problem {
                   3779:     my $self=shift;
                   3780:     my $src = $self->src();
                   3781:     if ($src =~ /\.(problem|exam|quiz|assess|survey|form|library|task)$/) {
                   3782:         return 1;
                   3783:     }
                   3784:     return 0;
                   3785: }
                   3786: 
1.256     albertel 3787: sub contains_problem {
                   3788:     my $self=shift;
                   3789:     if ($self->is_page()) {
                   3790: 	my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
                   3791: 	return $hasProblem;
                   3792:     }
                   3793:     return 0;
1.51      bowersj2 3794: }
1.401     albertel 3795: sub map_contains_problem {
                   3796:     my $self=shift;
                   3797:     if ($self->is_map()) {
                   3798: 	my $has_problem=
                   3799: 	    $self->hasResource($self,sub { $_[0]->is_problem() },1);
                   3800: 	return $has_problem;
                   3801:     }
                   3802:     return 0;
                   3803: }
1.70      bowersj2 3804: sub is_sequence {
1.51      bowersj2 3805:     my $self=shift;
1.205     bowersj2 3806:     return $self->navHash("is_map_", 1) && 
1.426     droeschl 3807:     $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
1.51      bowersj2 3808: }
1.261     matthew  3809: sub is_survey {
                   3810:     my $self = shift();
                   3811:     my $part = shift();
1.410     raeburn  3812:     my $type = $self->parmval('type',$part);
                   3813:     if ($type eq 'survey') {
1.261     matthew  3814:         return 1;
                   3815:     }
1.263     albertel 3816:     if ($self->src() =~ /\.(survey)$/) {
1.261     matthew  3817:         return 1;
                   3818:     }
                   3819:     return 0;
                   3820: }
1.360     albertel 3821: sub is_task {
                   3822:     my $self=shift;
                   3823:     my $src = $self->src();
                   3824:     return ($src =~ /\.(task)$/)
                   3825: }
1.51      bowersj2 3826: 
1.266     raeburn  3827: sub is_empty_sequence {
                   3828:     my $self=shift;
                   3829:     my $src = $self->src();
                   3830:     return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
                   3831: }
                   3832: 
1.101     bowersj2 3833: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51      bowersj2 3834: sub parmval {
                   3835:     my $self = shift;
                   3836:     my $what = shift;
1.185     bowersj2 3837:     my $part = shift;
                   3838:     if (!defined($part)) { 
                   3839:         $part = '0'; 
                   3840:     }
1.51      bowersj2 3841:     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
                   3842: }
                   3843: 
1.70      bowersj2 3844: =pod
                   3845: 
                   3846: B<Map Methods>
                   3847: 
1.174     albertel 3848: These methods are useful for getting information about the map
                   3849: properties of the resource, if the resource is a map (B<is_map>).
1.70      bowersj2 3850: 
                   3851: =over 4
                   3852: 
1.174     albertel 3853: =item * B<map_finish>:
                   3854: 
                   3855: Returns a reference to a resource object corresponding to the finish
                   3856: resource of the map.
1.70      bowersj2 3857: 
1.174     albertel 3858: =item * B<map_pc>:
1.70      bowersj2 3859: 
1.174     albertel 3860: Returns the pc value of the map, which is the first number that
                   3861: appears in the resource ID of the resources in the map, and is the
                   3862: number that appears around the middle of the symbs of the resources in
                   3863: that map.
1.70      bowersj2 3864: 
1.174     albertel 3865: =item * B<map_start>:
                   3866: 
                   3867: Returns a reference to a resource object corresponding to the start
                   3868: resource of the map.
                   3869: 
                   3870: =item * B<map_type>:
                   3871: 
                   3872: Returns a string with the type of the map in it.
1.70      bowersj2 3873: 
                   3874: =back
1.51      bowersj2 3875: 
1.70      bowersj2 3876: =cut
1.51      bowersj2 3877: 
                   3878: sub map_finish {
                   3879:     my $self = shift;
                   3880:     my $src = $self->src();
1.381     albertel 3881:     $src = &Apache::lonnet::clutter($src);
1.51      bowersj2 3882:     my $res = $self->navHash("map_finish_$src", 0);
                   3883:     $res = $self->{NAV_MAP}->getById($res);
                   3884:     return $res;
                   3885: }
1.70      bowersj2 3886: sub map_pc {
                   3887:     my $self = shift;
1.381     albertel 3888:     my $src = $self->src();
1.70      bowersj2 3889:     return $self->navHash("map_pc_$src", 0);
                   3890: }
1.51      bowersj2 3891: sub map_start {
                   3892:     my $self = shift;
                   3893:     my $src = $self->src();
1.381     albertel 3894:     $src = &Apache::lonnet::clutter($src);
1.51      bowersj2 3895:     my $res = $self->navHash("map_start_$src", 0);
                   3896:     $res = $self->{NAV_MAP}->getById($res);
                   3897:     return $res;
                   3898: }
                   3899: sub map_type {
                   3900:     my $self = shift;
                   3901:     my $pc = $self->map_pc();
                   3902:     return $self->navHash("map_type_$pc", 0);
                   3903: }
                   3904: 
                   3905: #####
                   3906: # Property queries
                   3907: #####
                   3908: 
                   3909: # These functions will be responsible for returning the CORRECT
                   3910: # VALUE for the parameter, no matter what. So while they may look
1.398     banghart 3911: # like direct calls to parmval, they can be more than that.
1.51      bowersj2 3912: # So, for instance, the duedate function should use the "duedatetype"
1.398     banghart 3913: # information, rather than the resource object user.
1.51      bowersj2 3914: 
                   3915: =pod
                   3916: 
                   3917: =head2 Resource Parameters
                   3918: 
1.174     albertel 3919: In order to use the resource parameters correctly, the nav map must
                   3920: have been instantiated with genCourseAndUserOptions set to true, so
                   3921: the courseopt and useropt is read correctly. Then, you can call these
                   3922: functions to get the relevant parameters for the resource. Each
                   3923: function defaults to part "0", but can be directed to another part by
                   3924: passing the part as the parameter.
                   3925: 
                   3926: These methods are responsible for getting the parameter correct, not
                   3927: merely reflecting the contents of the GDBM hashes. As we move towards
                   3928: dates relative to other dates, these methods should be updated to
                   3929: reflect that. (Then, anybody using these methods will not have to update
                   3930: their code.)
                   3931: 
                   3932: =over 4
                   3933: 
                   3934: =item * B<acc>:
                   3935: 
                   3936: Get the Client IP/Name Access Control information.
1.51      bowersj2 3937: 
1.174     albertel 3938: =item * B<answerdate>:
1.51      bowersj2 3939: 
1.174     albertel 3940: Get the answer-reveal date for the problem.
                   3941: 
1.211     bowersj2 3942: =item * B<awarded>: 
                   3943: 
                   3944: Gets the awarded value for the problem part. Requires genUserData set to
                   3945: true when the navmap object was created.
                   3946: 
1.174     albertel 3947: =item * B<duedate>:
                   3948: 
                   3949: Get the due date for the problem.
                   3950: 
                   3951: =item * B<tries>:
                   3952: 
                   3953: Get the number of tries the student has used on the problem.
                   3954: 
                   3955: =item * B<maxtries>:
                   3956: 
                   3957: Get the number of max tries allowed.
                   3958: 
                   3959: =item * B<opendate>:
1.51      bowersj2 3960: 
1.174     albertel 3961: Get the open date for the problem.
1.51      bowersj2 3962: 
1.174     albertel 3963: =item * B<sig>:
1.51      bowersj2 3964: 
1.174     albertel 3965: Get the significant figures setting.
1.51      bowersj2 3966: 
1.174     albertel 3967: =item * B<tol>:
1.51      bowersj2 3968: 
1.174     albertel 3969: Get the tolerance for the problem.
1.51      bowersj2 3970: 
1.174     albertel 3971: =item * B<tries>:
1.51      bowersj2 3972: 
1.174     albertel 3973: Get the number of tries the user has already used on the problem.
1.51      bowersj2 3974: 
1.174     albertel 3975: =item * B<type>:
1.51      bowersj2 3976: 
1.174     albertel 3977: Get the question type for the problem.
1.70      bowersj2 3978: 
1.174     albertel 3979: =item * B<weight>:
1.51      bowersj2 3980: 
1.174     albertel 3981: Get the weight for the problem.
1.51      bowersj2 3982: 
                   3983: =back
                   3984: 
                   3985: =cut
                   3986: 
                   3987: sub acc {
                   3988:     (my $self, my $part) = @_;
1.410     raeburn  3989:     my $acc = $self->parmval("acc", $part);
                   3990:     return $acc;
1.51      bowersj2 3991: }
                   3992: sub answerdate {
                   3993:     (my $self, my $part) = @_;
                   3994:     # Handle intervals
1.410     raeburn  3995:     my $answerdatetype = $self->parmval("answerdate.type", $part);
                   3996:     my $answerdate = $self->parmval("answerdate", $part);
                   3997:     my $duedate = $self->parmval("duedate", $part);
                   3998:     if ($answerdatetype eq 'date_interval') {
                   3999:         $answerdate = $duedate + $answerdate; 
1.51      bowersj2 4000:     }
1.410     raeburn  4001:     return $answerdate;
1.106     bowersj2 4002: }
1.211     bowersj2 4003: sub awarded { 
                   4004:     my $self = shift; my $part = shift;
1.221     bowersj2 4005:     $self->{NAV_MAP}->get_user_data();
1.211     bowersj2 4006:     if (!defined($part)) { $part = '0'; }
                   4007:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
                   4008: }
1.432     raeburn  4009: sub taskversion {
                   4010:     my $self = shift; my $part = shift;
                   4011:     $self->{NAV_MAP}->get_user_data();
                   4012:     if (!defined($part)) { $part = '0'; }
                   4013:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.version'};
                   4014: }
                   4015: sub taskstatus {
                   4016:     my $self = shift; my $part = shift;
                   4017:     $self->{NAV_MAP}->get_user_data();
                   4018:     if (!defined($part)) { $part = '0'; }
                   4019:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
                   4020: }
                   4021: sub solved {
                   4022:     my $self = shift; my $part = shift;
                   4023:     $self->{NAV_MAP}->get_user_data();
                   4024:     if (!defined($part)) { $part = '0'; }
                   4025:     return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.solved'};
                   4026: }
                   4027: sub checkedin {
                   4028:     my $self = shift; my $part = shift;
                   4029:     $self->{NAV_MAP}->get_user_data();
                   4030:     if (!defined($part)) { $part = '0'; }
                   4031:     if ($self->is_task()) {
                   4032:         my $version = $self->taskversion($part);
                   4033:         return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
                   4034:     } else {
                   4035:         return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
                   4036:     }
                   4037: }
1.382     albertel 4038: # this should work exactly like the copy in lonhomework.pm
1.51      bowersj2 4039: sub duedate {
                   4040:     (my $self, my $part) = @_;
1.382     albertel 4041:     my $date;
1.406     albertel 4042:     my @interval=$self->parmval("interval", $part);
1.382     albertel 4043:     my $due_date=$self->parmval("duedate", $part);
1.406     albertel 4044:     if ($interval[0] =~ /\d+/) {
                   4045:        my $first_access=&Apache::lonnet::get_first_access($interval[1],
                   4046:                                                           $self->symb);
1.382     albertel 4047: 	if (defined($first_access)) {
1.406     albertel 4048:            my $interval = $first_access+$interval[0];
1.404     albertel 4049: 	    $date = (!$due_date || $interval < $due_date) ? $interval 
                   4050:                                                           : $due_date;
1.382     albertel 4051: 	} else {
                   4052: 	    $date = $due_date;
                   4053: 	}
                   4054:     } else {
                   4055: 	$date = $due_date;
1.260     albertel 4056:     }
1.382     albertel 4057:     return $date;
1.51      bowersj2 4058: }
1.334     albertel 4059: sub handgrade {
                   4060:     (my $self, my $part) = @_;
1.399     albertel 4061:     my @response_ids = $self->responseIds($part);
                   4062:     if (@response_ids) {
                   4063: 	foreach my $response_id (@response_ids) {
1.410     raeburn  4064:             my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
                   4065: 	    if (lc($handgrade) eq 'yes') {
1.399     albertel 4066: 		return 'yes';
                   4067: 	    }
                   4068: 	}
                   4069:     }
1.410     raeburn  4070:     my $handgrade = $self->parmval("handgrade", $part);
                   4071:     return $handgrade;
1.334     albertel 4072: }
1.51      bowersj2 4073: sub maxtries {
                   4074:     (my $self, my $part) = @_;
1.410     raeburn  4075:     my $maxtries = $self->parmval("maxtries", $part);
                   4076:     return $maxtries;
1.51      bowersj2 4077: }
                   4078: sub opendate {
                   4079:     (my $self, my $part) = @_;
1.410     raeburn  4080:     my $opendatetype = $self->parmval("opendate.type", $part);
                   4081:     my $opendate = $self->parmval("opendate", $part); 
                   4082:     if ($opendatetype eq 'date_interval') {
                   4083:         my $duedate = $self->duedate($part);
                   4084:         $opendate = $duedate - $opendate; 
1.51      bowersj2 4085:     }
1.410     raeburn  4086:     return $opendate;
1.51      bowersj2 4087: }
1.185     bowersj2 4088: sub problemstatus {
                   4089:     (my $self, my $part) = @_;
1.410     raeburn  4090:     my $problemstatus = $self->parmval("problemstatus", $part);
                   4091:     return lc($problemstatus);
1.185     bowersj2 4092: }
1.51      bowersj2 4093: sub sig {
                   4094:     (my $self, my $part) = @_;
1.410     raeburn  4095:     my $sig = $self->parmval("sig", $part);
                   4096:     return $sig;
1.51      bowersj2 4097: }
                   4098: sub tol {
                   4099:     (my $self, my $part) = @_;
1.410     raeburn  4100:     my $tol = $self->parmval("tol", $part);
                   4101:     return $tol;
1.51      bowersj2 4102: }
1.410     raeburn  4103: sub tries {
1.108     bowersj2 4104:     my $self = shift; 
                   4105:     my $tries = $self->queryRestoreHash('tries', shift);
                   4106:     if (!defined($tries)) { return '0';}
1.51      bowersj2 4107:     return $tries;
                   4108: }
1.70      bowersj2 4109: sub type {
                   4110:     (my $self, my $part) = @_;
1.410     raeburn  4111:     my $type = $self->parmval("type", $part);
                   4112:     return $type;
1.70      bowersj2 4113: }
1.109     bowersj2 4114: sub weight { 
                   4115:     my $self = shift; my $part = shift;
1.211     bowersj2 4116:     if (!defined($part)) { $part = '0'; }
1.409     raeburn  4117:     my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
                   4118:                                 $self->symb(), $env{'user.domain'},
                   4119:                                 $env{'user.name'},
                   4120:                                 $env{'request.course.sec'});
                   4121:     return $weight;
1.274     matthew  4122: }
                   4123: sub part_display {
                   4124:     my $self= shift(); my $partID = shift();
                   4125:     if (! defined($partID)) { $partID = '0'; }
                   4126:     my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
                   4127:                                      $self->symb);
                   4128:     if (! defined($display) || $display eq '') {
                   4129:         $display = $partID;
                   4130:     }
                   4131:     return $display;
1.70      bowersj2 4132: }
1.432     raeburn  4133: sub slot_control {
                   4134:     my $self=shift(); my $part = shift();
                   4135:     if (!defined($part)) { $part = '0'; }
                   4136:     my $useslots = $self->parmval("useslots", $part);
                   4137:     my $availablestudent = $self->parmval("availablestudent", $part);
                   4138:     my $available = $self->parmval("available", $part); 
                   4139:     return ($useslots,$availablestudent,$available);
                   4140: }
1.51      bowersj2 4141: 
                   4142: # Multiple things need this
                   4143: sub getReturnHash {
                   4144:     my $self = shift;
                   4145:     
                   4146:     if (!defined($self->{RETURN_HASH})) {
1.84      bowersj2 4147:         my %tmpHash  = &Apache::lonnet::restore($self->symb());
1.51      bowersj2 4148:         $self->{RETURN_HASH} = \%tmpHash;
                   4149:     }
                   4150: }       
                   4151: 
                   4152: ######
                   4153: # Status queries
                   4154: ######
                   4155: 
                   4156: # These methods query the status of problems.
                   4157: 
                   4158: # If we need to count parts, this function determines the number of
                   4159: # parts from the metadata. When called, it returns a reference to a list
                   4160: # of strings corresponding to the parts. (Thus, using it in a scalar context
                   4161: # tells you how many parts you have in the problem:
                   4162: # $partcount = scalar($resource->countParts());
                   4163: # Don't use $self->{PARTS} directly because you don't know if it's been
                   4164: # computed yet.
                   4165: 
                   4166: =pod
                   4167: 
                   4168: =head2 Resource misc
                   4169: 
                   4170: Misc. functions for the resource.
                   4171: 
                   4172: =over 4
                   4173: 
1.174     albertel 4174: =item * B<hasDiscussion>:
1.59      bowersj2 4175: 
1.174     albertel 4176: Returns a false value if there has been discussion since the user last
                   4177: logged in, true if there has. Always returns false if the discussion
                   4178: data was not extracted when the nav map was constructed.
                   4179: 
1.366     albertel 4180: =item * B<last_post_time>:
                   4181: 
                   4182: Returns a false value if there hasn't been discussion otherwise returns
                   4183: unix timestamp of last time a discussion posting (or edit) was made.
                   4184: 
1.393     raeburn  4185: =item * B<discussion_info>:
1.366     albertel 4186: 
1.393     raeburn  4187: optional argument is a filter (currently can be 'unread');
                   4188: returns in scalar context the count of the number of discussion postings.
1.366     albertel 4189: 
                   4190: returns in list context both the count of postings and a hash ref
1.393     raeburn  4191: containing information about the postings (subject, id, timestamp) in a hash.
                   4192: 
                   4193: Default is to return counts for all postings.  However if called with a second argument set to 'unread', will return information about only unread postings.
1.366     albertel 4194: 
1.174     albertel 4195: =item * B<getFeedback>:
                   4196: 
                   4197: Gets the feedback for the resource and returns the raw feedback string
                   4198: for the resource, or the null string if there is no feedback or the
                   4199: email data was not extracted when the nav map was constructed. Usually
                   4200: used like this:
1.59      bowersj2 4201: 
1.394     raeburn  4202:  for my $url (split(/\,/, $res->getFeedback())) {
                   4203:     my $link = &escape($url);
1.59      bowersj2 4204:     ...
                   4205: 
                   4206: and use the link as appropriate.
                   4207: 
                   4208: =cut
                   4209: 
                   4210: sub hasDiscussion {
                   4211:     my $self = shift;
                   4212:     return $self->{NAV_MAP}->hasDiscussion($self->symb());
                   4213: }
                   4214: 
1.366     albertel 4215: sub last_post_time {
                   4216:     my $self = shift;
                   4217:     return $self->{NAV_MAP}->last_post_time($self->symb());
                   4218: }
                   4219: 
1.393     raeburn  4220: sub discussion_info {
                   4221:     my ($self,$filter) = @_;
                   4222:     return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
1.366     albertel 4223: }
                   4224: 
1.59      bowersj2 4225: sub getFeedback {
                   4226:     my $self = shift;
1.124     bowersj2 4227:     my $source = $self->src();
1.395     raeburn  4228:     my $symb = $self->symb();
1.125     bowersj2 4229:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.395     raeburn  4230:     return $self->{NAV_MAP}->getFeedback($symb,$source);
1.124     bowersj2 4231: }
                   4232: 
                   4233: sub getErrors {
                   4234:     my $self = shift;
                   4235:     my $source = $self->src();
1.395     raeburn  4236:     my $symb = $self->symb();
1.124     bowersj2 4237:     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.395     raeburn  4238:     return $self->{NAV_MAP}->getErrors($symb,$source);
1.59      bowersj2 4239: }
                   4240: 
                   4241: =pod
                   4242: 
1.174     albertel 4243: =item * B<parts>():
1.51      bowersj2 4244: 
1.174     albertel 4245: Returns a list reference containing sorted strings corresponding to
1.193     bowersj2 4246: each part of the problem. Single part problems have only a part '0'.
                   4247: Multipart problems do not return their part '0', since they typically
                   4248: do not really matter. 
1.174     albertel 4249: 
                   4250: =item * B<countParts>():
                   4251: 
                   4252: Returns the number of parts of the problem a student can answer. Thus,
                   4253: for single part problems, returns 1. For multipart, it returns the
1.193     bowersj2 4254: number of parts in the problem, not including psuedo-part 0. 
1.51      bowersj2 4255: 
1.290     matthew  4256: =item * B<countResponses>():
                   4257: 
                   4258: Returns the total number of responses in the problem a student can answer.
                   4259: 
                   4260: =item * B<responseTypes>():
                   4261: 
                   4262: Returns a hash whose keys are the response types.  The values are the number 
                   4263: of times each response type is used.  This is for the I<entire> problem, not 
                   4264: just a single part.
                   4265: 
1.192     bowersj2 4266: =item * B<multipart>():
                   4267: 
1.193     bowersj2 4268: Returns true if the problem is multipart, false otherwise. Use this instead
                   4269: of countParts if all you want is multipart/not multipart.
1.192     bowersj2 4270: 
1.187     bowersj2 4271: =item * B<responseType>($part):
                   4272: 
                   4273: Returns the response type of the part, without the word "response" on the
                   4274: end. Example return values: 'string', 'essay', 'numeric', etc.
                   4275: 
1.193     bowersj2 4276: =item * B<responseIds>($part):
1.187     bowersj2 4277: 
1.193     bowersj2 4278: Retreives the response IDs for the given part as an array reference containing
                   4279: strings naming the response IDs. This may be empty.
1.187     bowersj2 4280: 
1.51      bowersj2 4281: =back
                   4282: 
                   4283: =cut
                   4284: 
                   4285: sub parts {
                   4286:     my $self = shift;
                   4287: 
1.192     bowersj2 4288:     if ($self->ext) { return []; }
1.67      bowersj2 4289: 
1.51      bowersj2 4290:     $self->extractParts();
                   4291:     return $self->{PARTS};
                   4292: }
                   4293: 
                   4294: sub countParts {
                   4295:     my $self = shift;
                   4296:     
                   4297:     my $parts = $self->parts();
1.191     bowersj2 4298: 
                   4299:     # If I left this here, then it's not necessary.
                   4300:     #my $delta = 0;
                   4301:     #for my $part (@$parts) {
                   4302:     #    if ($part eq '0') { $delta--; }
                   4303:     #}
1.66      bowersj2 4304: 
                   4305:     if ($self->{RESOURCE_ERROR}) {
                   4306:         return 0;
                   4307:     }
                   4308: 
1.191     bowersj2 4309:     return scalar(@{$parts}); # + $delta;
1.192     bowersj2 4310: }
                   4311: 
1.290     matthew  4312: sub countResponses {
                   4313:     my $self = shift;
                   4314:     my $count;
1.293     matthew  4315:     foreach my $part (@{$self->parts()}) {
                   4316:         $count+= scalar($self->responseIds($part));
1.290     matthew  4317:     }
                   4318:     return $count;
                   4319: }
                   4320: 
                   4321: sub responseTypes {
                   4322:     my $self = shift;
1.291     albertel 4323:     my %responses;
1.368     raeburn  4324:     foreach my $part (@{$self->parts()}) {
1.290     matthew  4325:         foreach my $responsetype ($self->responseType($part)) {
1.291     albertel 4326:             $responses{$responsetype}++ if (defined($responsetype));
1.290     matthew  4327:         }
                   4328:     }
1.291     albertel 4329:     return %responses;
1.290     matthew  4330: }
                   4331: 
1.192     bowersj2 4332: sub multipart {
                   4333:     my $self = shift;
                   4334:     return $self->countParts() > 1;
1.51      bowersj2 4335: }
                   4336: 
1.225     bowersj2 4337: sub singlepart {
                   4338:     my $self = shift;
                   4339:     return $self->countParts() == 1;
                   4340: }
                   4341: 
1.187     bowersj2 4342: sub responseType {
1.184     bowersj2 4343:     my $self = shift;
                   4344:     my $part = shift;
                   4345: 
                   4346:     $self->extractParts();
1.235     albertel 4347:     if (defined($self->{RESPONSE_TYPES}->{$part})) {
                   4348: 	return @{$self->{RESPONSE_TYPES}->{$part}};
                   4349:     } else {
                   4350: 	return undef;
                   4351:     }
1.187     bowersj2 4352: }
                   4353: 
1.193     bowersj2 4354: sub responseIds {
1.187     bowersj2 4355:     my $self = shift;
                   4356:     my $part = shift;
                   4357: 
                   4358:     $self->extractParts();
1.235     albertel 4359:     if (defined($self->{RESPONSE_IDS}->{$part})) {
                   4360: 	return @{$self->{RESPONSE_IDS}->{$part}};
                   4361:     } else {
                   4362: 	return undef;
                   4363:     }
1.184     bowersj2 4364: }
                   4365: 
                   4366: # Private function: Extracts the parts information, both part names and
1.187     bowersj2 4367: # part types, and saves it. 
1.51      bowersj2 4368: sub extractParts { 
                   4369:     my $self = shift;
                   4370:     
1.153     bowersj2 4371:     return if (defined($self->{PARTS}));
1.67      bowersj2 4372:     return if ($self->ext);
1.51      bowersj2 4373: 
                   4374:     $self->{PARTS} = [];
                   4375: 
1.181     bowersj2 4376:     my %parts;
                   4377: 
1.82      bowersj2 4378:     # Retrieve part count, if this is a problem
                   4379:     if ($self->is_problem()) {
1.240     albertel 4380: 	my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
1.152     matthew  4381:         my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.181     bowersj2 4382: 
1.239     bowersj2 4383: 	if ($partorder) {
                   4384: 	    my @parts;
                   4385: 	    for my $part (split (/,/,$partorder)) {
                   4386: 		if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4387: 		    push @parts, $part;
1.241     albertel 4388: 		    $parts{$part} = 1;
1.239     bowersj2 4389: 		}
                   4390: 	    }
                   4391: 	    $self->{PARTS} = \@parts;
                   4392: 	} else {
                   4393: 	    if (!$metadata) {
                   4394: 		$self->{RESOURCE_ERROR} = 1;
                   4395: 		$self->{PARTS} = [];
                   4396: 		$self->{PART_TYPE} = {};
                   4397: 		return;
                   4398: 	    }
1.394     raeburn  4399: 	    foreach my $entry (split(/\,/,$metadata)) {
                   4400: 		if ($entry =~ /^(?:part|Task)_(.*)$/) {
1.239     bowersj2 4401: 		    my $part = $1;
                   4402: 		    # This floods the logs if it blows up
                   4403: 		    if (defined($parts{$part})) {
1.241     albertel 4404: 			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
                   4405: 		    }
1.239     bowersj2 4406: 		    
                   4407: 		    # check to see if part is turned off.
                   4408: 		    
                   4409: 		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                   4410: 			$parts{$part} = 1;
                   4411: 		    }
                   4412: 		}
                   4413: 	    }
                   4414: 	    my @sortedParts = sort keys %parts;
                   4415: 	    $self->{PARTS} = \@sortedParts;
1.51      bowersj2 4416:         }
1.82      bowersj2 4417:         
1.187     bowersj2 4418: 
1.284     matthew  4419:         # These hashes probably do not need names that end with "Hash"....
1.187     bowersj2 4420:         my %responseIdHash;
                   4421:         my %responseTypeHash;
                   4422: 
1.189     bowersj2 4423: 
                   4424:         # Init the responseIdHash
1.394     raeburn  4425:         foreach my $part (@{$self->{PARTS}}) {
                   4426:             $responseIdHash{$part} = [];
1.189     bowersj2 4427:         }
                   4428: 
1.187     bowersj2 4429:         # Now, the unfortunate thing about this is that parts, part name, and
1.239     bowersj2 4430:         # response id are delimited by underscores, but both the part
1.187     bowersj2 4431:         # name and response id can themselves have underscores in them.
                   4432:         # So we have to use our knowlege of part names to figure out 
                   4433:         # where the part names begin and end, and even then, it is possible
                   4434:         # to construct ambiguous situations.
1.379     albertel 4435:         foreach my $data (split /,/, $metadata) {
                   4436:             if ($data =~ /^([a-zA-Z]+)response_(.*)/
                   4437: 		|| $data =~ /^(Task)_(.*)/) {
1.187     bowersj2 4438:                 my $responseType = $1;
                   4439:                 my $partStuff = $2;
                   4440:                 my $partIdSoFar = '';
                   4441:                 my @partChunks = split /_/, $partStuff;
                   4442:                 my $i = 0;
                   4443:                 for ($i = 0; $i < scalar(@partChunks); $i++) {
                   4444:                     if ($partIdSoFar) { $partIdSoFar .= '_'; }
                   4445:                     $partIdSoFar .= $partChunks[$i];
                   4446:                     if ($parts{$partIdSoFar}) {
                   4447:                         my @otherChunks = @partChunks[$i+1..$#partChunks];
                   4448:                         my $responseId = join('_', @otherChunks);
1.379     albertel 4449: 			if ($self->is_task()) {
                   4450: 			    push(@{$responseIdHash{$partIdSoFar}},
                   4451: 				 $partIdSoFar);
                   4452: 			} else {
                   4453: 			    push(@{$responseIdHash{$partIdSoFar}},
                   4454: 				 $responseId);
                   4455: 			}
                   4456:                         push(@{$responseTypeHash{$partIdSoFar}},
                   4457: 			     $responseType);
1.187     bowersj2 4458:                     }
                   4459:                 }
                   4460:             }
                   4461:         }
1.264     albertel 4462: 	my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
1.284     matthew  4463:         #
                   4464:         # Reorder the arrays in the %responseIdHash and %responseTypeHash
1.264     albertel 4465: 	if ($resorder) {
                   4466: 	    my @resorder=split(/,/,$resorder);
                   4467: 	    foreach my $part (keys(%responseIdHash)) {
1.286     albertel 4468: 		my $i=0;
                   4469: 		my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
1.264     albertel 4470: 		my @neworder;
                   4471: 		foreach my $possibleid (@resorder) {
                   4472: 		    if (exists($resids{$possibleid})) {
1.286     albertel 4473: 			push(@neworder,$resids{$possibleid});
1.264     albertel 4474: 		    }
                   4475: 		}
1.286     albertel 4476: 		my @ids;
                   4477: 		my @type;
                   4478: 		foreach my $element (@neworder) {
                   4479: 		    push (@ids,$responseIdHash{$part}->[$element]);
                   4480: 		    push (@type,$responseTypeHash{$part}->[$element]);
                   4481: 		}
                   4482: 		$responseIdHash{$part}=\@ids;
                   4483: 		$responseTypeHash{$part}=\@type;
1.264     albertel 4484: 	    }
                   4485: 	}
1.187     bowersj2 4486:         $self->{RESPONSE_IDS} = \%responseIdHash;
                   4487:         $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154     bowersj2 4488:     }
                   4489: 
1.51      bowersj2 4490:     return;
                   4491: }
                   4492: 
                   4493: =pod
                   4494: 
                   4495: =head2 Resource Status
                   4496: 
1.174     albertel 4497: Problem resources have status information, reflecting their various
                   4498: dates and completion statuses.
1.51      bowersj2 4499: 
1.174     albertel 4500: There are two aspects to the status: the date-related information and
                   4501: the completion information.
1.51      bowersj2 4502: 
1.174     albertel 4503: Idiomatic usage of these two methods would probably look something
                   4504: like
1.51      bowersj2 4505: 
1.394     raeburn  4506:  foreach my $part ($resource->parts()) {
                   4507:     my $dateStatus = $resource->getDateStatus($part);
                   4508:     my $completionStatus = $resource->getCompletionStatus($part);
1.51      bowersj2 4509: 
1.70      bowersj2 4510:     or
                   4511: 
1.394     raeburn  4512:     my $status = $resource->status($part);
1.70      bowersj2 4513: 
1.51      bowersj2 4514:     ... use it here ...
                   4515:  }
                   4516: 
1.174     albertel 4517: Which you use depends on exactly what you are looking for. The
                   4518: status() function has been optimized for the nav maps display and may
                   4519: not precisely match what you need elsewhere.
1.101     bowersj2 4520: 
1.174     albertel 4521: The symbolic constants shown below can be accessed through the
                   4522: resource object: C<$res->OPEN>.
1.101     bowersj2 4523: 
1.51      bowersj2 4524: =over 4
                   4525: 
1.174     albertel 4526: =item * B<getDateStatus>($part):
                   4527: 
                   4528: ($part defaults to 0). A convenience function that returns a symbolic
                   4529: constant telling you about the date status of the part. The possible
                   4530: return values are:
1.51      bowersj2 4531: 
                   4532: =back
                   4533: 
                   4534: B<Date Codes>
                   4535: 
                   4536: =over 4
                   4537: 
1.174     albertel 4538: =item * B<OPEN_LATER>:
                   4539: 
                   4540: The problem will be opened later.
                   4541: 
                   4542: =item * B<OPEN>:
                   4543: 
                   4544: Open and not yet due.
                   4545: 
1.51      bowersj2 4546: 
1.174     albertel 4547: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4548: 
1.174     albertel 4549: The due date has passed, but the answer date has not yet arrived.
1.59      bowersj2 4550: 
1.174     albertel 4551: =item * B<PAST_DUE_NO_ANSWER>:
1.54      bowersj2 4552: 
1.174     albertel 4553: The due date has passed and there is no answer opening date set.
1.51      bowersj2 4554: 
1.174     albertel 4555: =item * B<ANSWER_OPEN>:
1.51      bowersj2 4556: 
1.174     albertel 4557: The answer date is here.
                   4558: 
                   4559: =item * B<NETWORK_FAILURE>:
                   4560: 
                   4561: The information is unknown due to network failure.
1.51      bowersj2 4562: 
                   4563: =back
                   4564: 
                   4565: =cut
                   4566: 
                   4567: # Apparently the compiler optimizes these into constants automatically
1.54      bowersj2 4568: sub OPEN_LATER             { return 0; }
                   4569: sub OPEN                   { return 1; }
                   4570: sub PAST_DUE_NO_ANSWER     { return 2; }
                   4571: sub PAST_DUE_ANSWER_LATER  { return 3; }
                   4572: sub ANSWER_OPEN            { return 4; }
1.432     raeburn  4573: sub NOTHING_SET            { return 5; }
1.54      bowersj2 4574: sub NETWORK_FAILURE        { return 100; }
                   4575: 
                   4576: # getDateStatus gets the date status for a given problem part. 
                   4577: # Because answer date, due date, and open date are fully independent
                   4578: # (i.e., it is perfectly possible to *only* have an answer date), 
                   4579: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
                   4580: # (past, future, none given). This function handles this with a decision
                   4581: # tree. Read the comments to follow the decision tree.
1.51      bowersj2 4582: 
                   4583: sub getDateStatus {
                   4584:     my $self = shift;
                   4585:     my $part = shift;
                   4586:     $part = "0" if (!defined($part));
1.54      bowersj2 4587: 
                   4588:     # Always return network failure if there was one.
1.51      bowersj2 4589:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4590: 
                   4591:     my $now = time();
                   4592: 
1.53      bowersj2 4593:     my $open = $self->opendate($part);
                   4594:     my $due = $self->duedate($part);
                   4595:     my $answer = $self->answerdate($part);
                   4596: 
                   4597:     if (!$open && !$due && !$answer) {
                   4598:         # no data on the problem at all
                   4599:         # should this be the same as "open later"? think multipart.
                   4600:         return $self->NOTHING_SET;
                   4601:     }
1.59      bowersj2 4602:     if (!$open || $now < $open) {return $self->OPEN_LATER}
                   4603:     if (!$due || $now < $due) {return $self->OPEN}
                   4604:     if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
                   4605:     if ($answer) { return $self->ANSWER_OPEN; }
1.54      bowersj2 4606:     return PAST_DUE_NO_ANSWER;
1.51      bowersj2 4607: }
                   4608: 
                   4609: =pod
                   4610: 
                   4611: B<>
                   4612: 
                   4613: =over 4
                   4614: 
1.174     albertel 4615: =item * B<getCompletionStatus>($part):
1.51      bowersj2 4616: 
1.174     albertel 4617: ($part defaults to 0.) A convenience function that returns a symbolic
                   4618: constant telling you about the completion status of the part, with the
                   4619: following possible results:
                   4620: 
                   4621: =back
1.51      bowersj2 4622: 
                   4623: B<Completion Codes>
                   4624: 
                   4625: =over 4
                   4626: 
1.174     albertel 4627: =item * B<NOT_ATTEMPTED>:
                   4628: 
                   4629: Has not been attempted at all.
                   4630: 
                   4631: =item * B<INCORRECT>:
                   4632: 
                   4633: Attempted, but wrong by student.
1.51      bowersj2 4634: 
1.174     albertel 4635: =item * B<INCORRECT_BY_OVERRIDE>:
1.51      bowersj2 4636: 
1.174     albertel 4637: Attempted, but wrong by instructor override.
1.51      bowersj2 4638: 
1.174     albertel 4639: =item * B<CORRECT>:
1.51      bowersj2 4640: 
1.174     albertel 4641: Correct or correct by instructor.
1.51      bowersj2 4642: 
1.174     albertel 4643: =item * B<CORRECT_BY_OVERRIDE>:
1.51      bowersj2 4644: 
1.174     albertel 4645: Correct by instructor override.
1.51      bowersj2 4646: 
1.174     albertel 4647: =item * B<EXCUSED>:
                   4648: 
                   4649: Excused. Not yet implemented.
                   4650: 
                   4651: =item * B<NETWORK_FAILURE>:
                   4652: 
                   4653: Information not available due to network failure.
                   4654: 
                   4655: =item * B<ATTEMPTED>:
                   4656: 
                   4657: Attempted, and not yet graded.
1.69      bowersj2 4658: 
1.51      bowersj2 4659: =back
                   4660: 
                   4661: =cut
                   4662: 
1.53      bowersj2 4663: sub NOT_ATTEMPTED         { return 10; }
                   4664: sub INCORRECT             { return 11; }
                   4665: sub INCORRECT_BY_OVERRIDE { return 12; }
                   4666: sub CORRECT               { return 13; }
                   4667: sub CORRECT_BY_OVERRIDE   { return 14; }
                   4668: sub EXCUSED               { return 15; }
1.69      bowersj2 4669: sub ATTEMPTED             { return 16; }
1.51      bowersj2 4670: 
                   4671: sub getCompletionStatus {
                   4672:     my $self = shift;
1.332     albertel 4673:     my $part = shift;
1.51      bowersj2 4674:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4675: 
1.332     albertel 4676:     my $status = $self->queryRestoreHash('solved', $part);
1.51      bowersj2 4677: 
1.251     www      4678:     # Left as separate if statements in case we ever do more with this
1.51      bowersj2 4679:     if ($status eq 'correct_by_student') {return $self->CORRECT;}
1.288     albertel 4680:     if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
1.332     albertel 4681:     if ($status eq 'correct_by_override') {
                   4682: 	return $self->CORRECT_BY_OVERRIDE;
                   4683:     }
1.51      bowersj2 4684:     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
                   4685:     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
                   4686:     if ($status eq 'excused') {return $self->EXCUSED; }
1.69      bowersj2 4687:     if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51      bowersj2 4688:     return $self->NOT_ATTEMPTED;
1.108     bowersj2 4689: }
                   4690: 
                   4691: sub queryRestoreHash {
                   4692:     my $self = shift;
                   4693:     my $hashentry = shift;
                   4694:     my $part = shift;
1.185     bowersj2 4695:     $part = "0" if (!defined($part) || $part eq '');
1.108     bowersj2 4696:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   4697: 
                   4698:     $self->getReturnHash();
                   4699: 
                   4700:     return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51      bowersj2 4701: }
                   4702: 
                   4703: =pod
                   4704: 
                   4705: B<Composite Status>
                   4706: 
1.174     albertel 4707: Along with directly returning the date or completion status, the
                   4708: resource object includes a convenience function B<status>() that will
                   4709: combine the two status tidbits into one composite status that can
1.191     bowersj2 4710: represent the status of the resource as a whole. This method represents
                   4711: the concept of the thing we want to display to the user on the nav maps
                   4712: screen, which is a combination of completion and open status. The precise logic is
1.174     albertel 4713: documented in the comments of the status method. The following results
                   4714: may be returned, all available as methods on the resource object
1.185     bowersj2 4715: ($res->NETWORK_FAILURE): In addition to the return values that match
                   4716: the date or completion status, this function can return "ANSWER_SUBMITTED"
                   4717: if that problemstatus parameter value is set to No, suppressing the
                   4718: incorrect/correct feedback.
1.51      bowersj2 4719: 
                   4720: =over 4
                   4721: 
1.174     albertel 4722: =item * B<NETWORK_FAILURE>:
                   4723: 
                   4724: The network has failed and the information is not available.
1.51      bowersj2 4725: 
1.174     albertel 4726: =item * B<NOTHING_SET>:
1.53      bowersj2 4727: 
1.174     albertel 4728: No dates have been set for this problem (part) at all. (Because only
                   4729: certain parts of a multi-part problem may be assigned, this can not be
                   4730: collapsed into "open later", as we do not know a given part will EVER
                   4731: be opened. For single part, this is the same as "OPEN_LATER".)
1.51      bowersj2 4732: 
1.174     albertel 4733: =item * B<CORRECT>:
1.51      bowersj2 4734: 
1.174     albertel 4735: For any reason at all, the part is considered correct.
1.54      bowersj2 4736: 
1.174     albertel 4737: =item * B<EXCUSED>:
1.51      bowersj2 4738: 
1.174     albertel 4739: For any reason at all, the problem is excused.
1.51      bowersj2 4740: 
1.174     albertel 4741: =item * B<PAST_DUE_NO_ANSWER>:
1.51      bowersj2 4742: 
1.174     albertel 4743: The problem is past due, not considered correct, and no answer date is
                   4744: set.
1.51      bowersj2 4745: 
1.174     albertel 4746: =item * B<PAST_DUE_ANSWER_LATER>:
1.51      bowersj2 4747: 
1.174     albertel 4748: The problem is past due, not considered correct, and an answer date in
                   4749: the future is set.
1.51      bowersj2 4750: 
1.174     albertel 4751: =item * B<ANSWER_OPEN>:
                   4752: 
                   4753: The problem is past due, not correct, and the answer is now available.
                   4754: 
                   4755: =item * B<OPEN_LATER>:
                   4756: 
                   4757: The problem is not yet open.
                   4758: 
                   4759: =item * B<TRIES_LEFT>:
                   4760: 
                   4761: The problem is open, has been tried, is not correct, but there are
                   4762: tries left.
                   4763: 
                   4764: =item * B<INCORRECT>:
                   4765: 
                   4766: The problem is open, and all tries have been used without getting the
                   4767: correct answer.
                   4768: 
                   4769: =item * B<OPEN>:
                   4770: 
                   4771: The item is open and not yet tried.
                   4772: 
                   4773: =item * B<ATTEMPTED>:
                   4774: 
                   4775: The problem has been attempted.
1.69      bowersj2 4776: 
1.185     bowersj2 4777: =item * B<ANSWER_SUBMITTED>:
                   4778: 
                   4779: An answer has been submitted, but the student should not see it.
                   4780: 
1.51      bowersj2 4781: =back
                   4782: 
                   4783: =cut
                   4784: 
1.432     raeburn  4785: sub TRIES_LEFT        { return 20; }
                   4786: sub ANSWER_SUBMITTED  { return 21; }
                   4787: sub PARTIALLY_CORRECT { return 22; }
                   4788: 
                   4789: sub RESERVED_LATER    { return 30; }
                   4790: sub RESERVED          { return 31; }
                   4791: sub RESERVED_LOCATION { return 32; }
                   4792: sub RESERVABLE        { return 33; }
                   4793: sub RESERVABLE_LATER  { return 34; }
                   4794: sub NOTRESERVABLE     { return 35; }
                   4795: sub NOT_IN_A_SLOT     { return 36; }
                   4796: sub NEEDS_CHECKIN     { return 37; }
                   4797: sub WAITING_FOR_GRADE { return 38; }
                   4798: sub UNKNOWN           { return 39; }
1.51      bowersj2 4799: 
                   4800: sub status {
                   4801:     my $self = shift;
                   4802:     my $part = shift;
                   4803:     if (!defined($part)) { $part = "0"; }
                   4804:     my $completionStatus = $self->getCompletionStatus($part);
                   4805:     my $dateStatus = $self->getDateStatus($part);
                   4806: 
                   4807:     # What we have is a two-dimensional matrix with 4 entries on one
                   4808:     # dimension and 5 entries on the other, which we want to colorize,
1.54      bowersj2 4809:     # plus network failure and "no date data at all".
1.51      bowersj2 4810: 
1.222     bowersj2 4811:     #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
1.53      bowersj2 4812:     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51      bowersj2 4813: 
1.408     raeburn  4814:     my $suppressFeedback = 0;
                   4815:     if (($self->problemstatus($part) eq 'no') ||
                   4816:         ($self->problemstatus($part) eq 'no_feedback_ever')) {
                   4817:         $suppressFeedback = 1;
                   4818:     }
1.236     bowersj2 4819:     # If there's an answer date and we're past it, don't
                   4820:     # suppress the feedback; student should know
1.330     albertel 4821:     if ($self->duedate($part) && $self->duedate($part) < time() &&
                   4822: 	$self->answerdate($part) && $self->answerdate($part) < time()) {
1.236     bowersj2 4823: 	$suppressFeedback = 0;
                   4824:     }
1.185     bowersj2 4825: 
1.51      bowersj2 4826:     # There are a few whole rows we can dispose of:
1.53      bowersj2 4827:     if ($completionStatus == CORRECT ||
                   4828:         $completionStatus == CORRECT_BY_OVERRIDE ) {
1.332     albertel 4829: 	if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
                   4830: 	my $awarded=$self->awarded($part);
                   4831: 	if ($awarded < 1 && $awarded > 0) {
                   4832:             return PARTIALLY_CORRECT;
                   4833: 	} elsif ($awarded<1) {
                   4834: 	    return INCORRECT;
                   4835: 	}
                   4836: 	return CORRECT; 
1.69      bowersj2 4837:     }
                   4838: 
1.343     albertel 4839:     # If it's WRONG... and not open
                   4840:     if ( ($completionStatus == INCORRECT || 
                   4841: 	  $completionStatus == INCORRECT_BY_OVERRIDE)
                   4842: 	 && (!$self->opendate($part) ||  $self->opendate($part) > time()) ) {
                   4843: 	return INCORRECT;
                   4844:     }
                   4845: 
1.69      bowersj2 4846:     if ($completionStatus == ATTEMPTED) {
                   4847:         return ATTEMPTED;
1.53      bowersj2 4848:     }
                   4849: 
                   4850:     # If it's EXCUSED, then return that no matter what
                   4851:     if ($completionStatus == EXCUSED) {
                   4852:         return EXCUSED; 
1.51      bowersj2 4853:     }
                   4854: 
1.53      bowersj2 4855:     if ($dateStatus == NOTHING_SET) {
                   4856:         return NOTHING_SET;
1.51      bowersj2 4857:     }
                   4858: 
1.69      bowersj2 4859:     # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
                   4860:     # by 4 matrix (date statuses).
1.51      bowersj2 4861: 
1.54      bowersj2 4862:     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59      bowersj2 4863:         $dateStatus == PAST_DUE_NO_ANSWER ) {
1.272     albertel 4864:         return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus; 
1.51      bowersj2 4865:     }
                   4866: 
1.53      bowersj2 4867:     if ($dateStatus == ANSWER_OPEN) {
                   4868:         return ANSWER_OPEN;
1.51      bowersj2 4869:     }
                   4870: 
                   4871:     # Now: (incorrect, incorrect_override, not_attempted) x 
                   4872:     # (open_later), (open)
                   4873:     
1.53      bowersj2 4874:     if ($dateStatus == OPEN_LATER) {
                   4875:         return OPEN_LATER;
1.51      bowersj2 4876:     }
                   4877: 
                   4878:     # If it's WRONG...
1.53      bowersj2 4879:     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51      bowersj2 4880:         # and there are TRIES LEFT:
1.79      bowersj2 4881:         if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.222     bowersj2 4882:             return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
1.51      bowersj2 4883:         }
1.185     bowersj2 4884:         return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51      bowersj2 4885:     }
                   4886: 
                   4887:     # Otherwise, it's untried and open
1.53      bowersj2 4888:     return OPEN; 
1.224     bowersj2 4889: }
                   4890: 
1.432     raeburn  4891: sub check_for_slot {
                   4892:     my $self = shift;
                   4893:     my $part = shift;
                   4894:     my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
                   4895:     if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
                   4896:         my @slots = (split(/:/,$availablestudent),split(/:/,$available));
                   4897:         my $cid=$env{'request.course.id'};
                   4898:         my $cdom=$env{'course.'.$cid.'.domain'};
                   4899:         my $cnum=$env{'course.'.$cid.'.num'};
                   4900:         my $now = time;
                   4901:         if (@slots > 0) {
                   4902:             my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
                   4903:             if (&Apache::lonnet::error(%slots)) {
                   4904:                 return (UNKNOWN);
                   4905:             }
                   4906:             my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots);
                   4907:             my ($checkedin,$checkedinslot);
                   4908:             foreach my $slot_name (@sorted_slots) {
                   4909:                 next if (!defined($slots{$slot_name}) ||
                   4910:                          !ref($slots{$slot_name}));
                   4911:                 my $end = $slots{$slot_name}->{'endtime'};
                   4912:                 my $start = $slots{$slot_name}->{'starttime'};
                   4913:                 my $ip = $slots{$slot_name}->{'ip'};
                   4914:                 if ($self->simpleStatus() == OPEN) {
                   4915:                     my $startreserve = $slots{$slot_name}->{'startreserve'};
                   4916:                     my @proctors;
                   4917:                     if ($slots{$slot_name}->{'proctor'} ne '') {
                   4918:                         @proctors = split(',',$slots{$slot_name}->{'proctor'});
                   4919:                     }
                   4920:                     if ($end > $now) {
                   4921:                         ($checkedin,$checkedinslot) = $self->checkedin();
                   4922:                         if ($startreserve < $now) {
                   4923:                             if ($start > $now) {
                   4924:                                 return (RESERVED_LATER,$start,$slot_name);
                   4925:                             } else {
                   4926:                                 if ($ip ne '') {
                   4927:                                     if (!&Apache::loncommon::check_ip_acc($ip)) {
                   4928:                                         return (RESERVED_LOCATION,$ip,$slot_name);
                   4929:                                     }
                   4930:                                 } 
                   4931:                                 if (@proctors > 0) {
                   4932:                                     unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
                   4933:                                         ($checkedinslot eq $slot_name)) {
                   4934:                                         return (NEEDS_CHECKIN,undef,$slot_name); 
                   4935:                                     }
                   4936:                                 }
                   4937:                                 return (RESERVED,$end,$slot_name);
                   4938:                             }
                   4939:                         } else {
                   4940:                             if ($start > $now) {
                   4941:                                 return (RESERVABLE,$startreserve,$slot_name);
                   4942:                             }
                   4943:                         }
                   4944:                     }
                   4945:                 }
                   4946:             }
                   4947:             my ($is_correct,$got_grade);
                   4948:             if ($self->is_task()) {
                   4949:                 my $taskstatus = $self->taskstatus();
                   4950:                 $is_correct = (($taskstatus eq 'pass') || 
                   4951:                                ($self->solved() =~ /^correct_/));
                   4952:                 $got_grade = ($self->solved() =~ /^(?:pass|fail)$/);
                   4953:             } else {
                   4954:                 $got_grade = 1;
                   4955:                 $is_correct = ($self->solved() =~ /^correct_/);   
                   4956:             }
                   4957:             ($checkedin,$checkedinslot) = $self->checkedin();
                   4958:             if ($checkedin) {
                   4959:                 if (!$got_grade) {
                   4960:                     return (WAITING_FOR_GRADE);
                   4961:                 } elsif ($is_correct) {
                   4962:                     return (CORRECT); 
                   4963:                 }
                   4964:             }
                   4965:             return(NOT_IN_A_SLOT);
                   4966:         } else {
                   4967:             if (!$future_slots_checked) {
                   4968:                 $future_slots = &get_future_slots($cdom,$cnum,$now);
                   4969:                 $future_slots_checked = 1;
                   4970:             }
                   4971:             if ($future_slots) {
                   4972:                 return(NOT_IN_A_SLOT);
                   4973:             }
                   4974:             return(NOTRESERVABLE);
                   4975:         }
                   4976:     }
                   4977:     return;
                   4978: }
                   4979: 
                   4980: sub get_future_slots {
                   4981:     my ($cdom,$cnum,$now) = @_;
                   4982:     my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
                   4983:     my $future_slots = 0;
                   4984:     foreach my $slot (keys(%slots)) {
                   4985:         if (($slots{$slot}->{'starttime'} > $now) &&
                   4986:             ($slots{$slot}->{'endtime'} > $now)) {
                   4987:             $future_slots ++;
                   4988:         }
                   4989:     }
                   4990:     return $future_slots;
                   4991: }
                   4992: 
1.224     bowersj2 4993: sub CLOSED { return 23; }
                   4994: sub ERROR { return 24; }
                   4995: 
                   4996: =pod
                   4997: 
                   4998: B<Simple Status>
                   4999: 
                   5000: Convenience method B<simpleStatus> provides a "simple status" for the resource.
                   5001: "Simple status" corresponds to "which icon is shown on the
                   5002: Navmaps". There are six "simple" statuses:
                   5003: 
                   5004: =over 4
                   5005: 
                   5006: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
                   5007: 
                   5008: =item * B<OPEN>: The problem is open and unattempted.
                   5009: 
                   5010: =item * B<CORRECT>: The problem is correct for any reason.
                   5011: 
                   5012: =item * B<INCORRECT>: The problem is incorrect and can still be
                   5013: completed successfully.
                   5014: 
                   5015: =item * B<ATTEMPTED>: The problem has been attempted, but the student
                   5016: does not know if they are correct. (The ellipsis icon.)
                   5017: 
                   5018: =item * B<ERROR>: There is an error retrieving information about this
                   5019: problem.
                   5020: 
                   5021: =back
                   5022: 
                   5023: =cut
                   5024: 
                   5025: # This hash maps the composite status to this simple status, and
                   5026: # can be used directly, if you like
                   5027: my %compositeToSimple = 
                   5028:     (
                   5029:       NETWORK_FAILURE()       => ERROR,
                   5030:       NOTHING_SET()           => CLOSED,
                   5031:       CORRECT()               => CORRECT,
1.332     albertel 5032:       PARTIALLY_CORRECT()     => PARTIALLY_CORRECT,
1.224     bowersj2 5033:       EXCUSED()               => CORRECT,
                   5034:       PAST_DUE_NO_ANSWER()    => INCORRECT,
                   5035:       PAST_DUE_ANSWER_LATER() => INCORRECT,
                   5036:       ANSWER_OPEN()           => INCORRECT,
                   5037:       OPEN_LATER()            => CLOSED,
                   5038:       TRIES_LEFT()            => OPEN,
                   5039:       INCORRECT()             => INCORRECT,
                   5040:       OPEN()                  => OPEN,
                   5041:       ATTEMPTED()             => ATTEMPTED,
                   5042:       ANSWER_SUBMITTED()      => ATTEMPTED
                   5043:      );
                   5044: 
                   5045: sub simpleStatus {
                   5046:     my $self = shift;
                   5047:     my $part = shift;
                   5048:     my $status = $self->status($part);
                   5049:     return $compositeToSimple{$status};
1.225     bowersj2 5050: }
                   5051: 
                   5052: =pod
                   5053: 
                   5054: B<simpleStatusCount> will return an array reference containing, in
                   5055: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
                   5056: and ERROR parts the given problem has.
                   5057: 
                   5058: =cut
                   5059:     
                   5060: # This maps the status to the slot we want to increment
                   5061: my %statusToSlotMap = 
                   5062:     (
                   5063:      OPEN()      => 0,
                   5064:      CLOSED()    => 1,
                   5065:      CORRECT()   => 2,
                   5066:      INCORRECT() => 3,
                   5067:      ATTEMPTED() => 4,
                   5068:      ERROR()     => 5
                   5069:      );
                   5070: 
                   5071: sub statusToSlot { return $statusToSlotMap{shift()}; }
                   5072: 
                   5073: sub simpleStatusCount {
                   5074:     my $self = shift;
                   5075: 
                   5076:     my @counts = (0, 0, 0, 0, 0, 0, 0);
                   5077:     foreach my $part (@{$self->parts()}) {
                   5078: 	$counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
                   5079:     }
                   5080: 
                   5081:     return \@counts;
1.191     bowersj2 5082: }
                   5083: 
                   5084: =pod
                   5085: 
                   5086: B<Completable>
                   5087: 
                   5088: The completable method represents the concept of I<whether the student can
                   5089: currently do the problem>. If the student can do the problem, which means
                   5090: that it is open, there are tries left, and if the problem is manually graded
                   5091: or the grade is suppressed via problemstatus, the student has not tried it
                   5092: yet, then the method returns 1. Otherwise, it returns 0, to indicate that 
                   5093: either the student has tried it and there is no feedback, or that for
                   5094: some reason it is no longer completable (not open yet, successfully completed,
                   5095: out of tries, etc.). As an example, this is used as the filter for the
                   5096: "Uncompleted Homework" option for the nav maps.
                   5097: 
                   5098: If this does not quite meet your needs, do not fiddle with it (unless you are
                   5099: fixing it to better match the student's conception of "completable" because
                   5100: it's broken somehow)... make a new method.
                   5101: 
                   5102: =cut
                   5103: 
                   5104: sub completable {
                   5105:     my $self = shift;
                   5106:     if (!$self->is_problem()) { return 0; }
                   5107:     my $partCount = $self->countParts();
                   5108: 
                   5109:     foreach my $part (@{$self->parts()}) {
                   5110:         if ($part eq '0' && $partCount != 1) { next; }
                   5111:         my $status = $self->status($part);
                   5112:         # "If any of the parts are open, or have tries left (implies open),
                   5113:         # and it is not "attempted" (manually graded problem), it is
                   5114:         # not "complete"
1.216     bowersj2 5115: 	if ($self->getCompletionStatus($part) == ATTEMPTED() ||
                   5116: 	    $status == ANSWER_SUBMITTED() ) {
                   5117: 	    # did this part already, as well as we can
                   5118: 	    next;
                   5119: 	}
                   5120: 	if ($status == OPEN() || $status == TRIES_LEFT()) {
                   5121: 	    return 1;
                   5122: 	}
1.191     bowersj2 5123:     }
                   5124:         
                   5125:     # If all the parts were complete, so was this problem.
1.216     bowersj2 5126:     return 0;
1.51      bowersj2 5127: }
                   5128: 
                   5129: =pod
                   5130: 
                   5131: =head2 Resource/Nav Map Navigation
                   5132: 
                   5133: =over 4
                   5134: 
1.174     albertel 5135: =item * B<getNext>():
                   5136: 
                   5137: Retreive an array of the possible next resources after this
                   5138: one. Always returns an array, even in the one- or zero-element case.
                   5139: 
                   5140: =item * B<getPrevious>():
1.85      bowersj2 5141: 
1.174     albertel 5142: Retreive an array of the possible previous resources from this
                   5143: one. Always returns an array, even in the one- or zero-element case.
1.51      bowersj2 5144: 
                   5145: =cut
                   5146: 
                   5147: sub getNext {
                   5148:     my $self = shift;
                   5149:     my @branches;
                   5150:     my $to = $self->to();
1.85      bowersj2 5151:     foreach my $branch ( split(/,/, $to) ) {
1.51      bowersj2 5152:         my $choice = $self->{NAV_MAP}->getById($branch);
1.342     albertel 5153:         #if (!$choice->condition()) { next; }
1.51      bowersj2 5154:         my $next = $choice->goesto();
                   5155:         $next = $self->{NAV_MAP}->getById($next);
                   5156: 
1.131     bowersj2 5157:         push @branches, $next;
1.85      bowersj2 5158:     }
                   5159:     return \@branches;
                   5160: }
                   5161: 
                   5162: sub getPrevious {
                   5163:     my $self = shift;
                   5164:     my @branches;
                   5165:     my $from = $self->from();
                   5166:     foreach my $branch ( split /,/, $from) {
                   5167:         my $choice = $self->{NAV_MAP}->getById($branch);
                   5168:         my $prev = $choice->comesfrom();
                   5169:         $prev = $self->{NAV_MAP}->getById($prev);
                   5170: 
1.131     bowersj2 5171:         push @branches, $prev;
1.51      bowersj2 5172:     }
                   5173:     return \@branches;
1.131     bowersj2 5174: }
                   5175: 
                   5176: sub browsePriv {
                   5177:     my $self = shift;
                   5178:     if (defined($self->{BROWSE_PRIV})) {
                   5179:         return $self->{BROWSE_PRIV};
                   5180:     }
                   5181: 
1.311     albertel 5182:     $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
                   5183: 						    $self->symb());
1.51      bowersj2 5184: }
                   5185: 
                   5186: =pod
1.2       www      5187: 
1.51      bowersj2 5188: =back
1.2       www      5189: 
1.51      bowersj2 5190: =cut
1.2       www      5191: 
1.51      bowersj2 5192: 1;
1.2       www      5193: 
1.51      bowersj2 5194: __END__
1.2       www      5195: 
                   5196: 

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