1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.470 2011/11/29 11:58:53 foxr Exp $
5:
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: #
29: ###
30:
31: =pod
32:
33: =head1 NAME
34:
35: Apache::lonnavmaps - Subroutines to handle and render the navigation
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:
52: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
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.
196:
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.
200:
201: =back
202:
203: If you add any others please be sure to document them here.
204:
205: An example of a column renderer that will show the ID number of a
206: resource, along with the part name if any:
207:
208: sub {
209: my ($resource, $part, $params) = @_;
210: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
211: return '<td>' . $resource->{ID} . '</td>';
212: }
213:
214: Note these functions are responsible for the TD tags, which allow them
215: to override vertical and horizontal alignment, etc.
216:
217: =head2 Parameters
218:
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.
225:
226: =over 4
227:
228: =item * B<iterator: default: constructs one from %env
229:
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.
236:
237: =item * B<iterator_map>: default: not used
238:
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'.
243:
244: =item * B<include_top_level_map>: default: false
245:
246: If you need to include the top level map (meaning the course) in the
247: rendered output set this to true
248:
249: =item * B<navmap>: default: constructs one from %env
250:
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.
255:
256: =item * B<r>: default: must be passed in
257:
258: The standard Apache response object. This must be passed to the
259: renderer or the course hash will be locked.
260:
261: =item * B<cols>: default: empty (useless)
262:
263: An array reference
264:
265: =item * B<showParts>:default true
266:
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.
270:
271: =item * B<condenseParts>: default true
272:
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.
278:
279: =item * B<jumpCount>: default: determined from %env
280:
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.
286:
287: =item * B<here>: default: empty string
288:
289: A Symb identifying where to place the 'here' marker. The empty
290: string means no marker.
291:
292: =item * B<indentString>: default: 25 pixel whitespace image
293:
294: A string identifying the indentation string to use.
295:
296: =item * B<queryString>: default: empty
297:
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.
301:
302: =item * B<url>: default: none
303:
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.
307:
308: =item * B<currentJumpIndex>: default: no jumping
309:
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.*'}.
313:
314: =item * B<printKey>: default: false
315:
316: If true, print the key that appears on the top of the standard
317: navmaps.
318:
319: =item * B<printCloseAll>: default: true
320:
321: If true, print the "Close all folders" or "open all folders"
322: links.
323:
324: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
325:
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.
329:
330: =item * B<suppressEmptySequences>: default: false
331:
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.
338:
339: =item * B<suppressNavmaps>: default: false
340:
341: If true, will not display Navigate Content resources.
342:
343: =back
344:
345: =head2 Additional Info
346:
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:
351:
352: =over 4
353:
354: =item * B<counter>:
355:
356: Contains the number of rows printed. Useful after calling the render
357: function, as you can detect whether anything was printed at all.
358:
359: =item * B<isNewBranch>:
360:
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
364:
365: =back
366:
367: =cut
368:
369:
370: =head1 SUBROUTINES
371:
372: =over
373:
374: =item update()
375:
376: =item addToFilter()
377:
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
381:
382: =item removeFromFilter()
383:
384: =item getLinkForResource()
385:
386: Convenience function: Given a stack returned from getStack on the iterator,
387: return the correct src() value.
388:
389: =item getDescription()
390:
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.
396:
397: =item dueInLessThan24Hours()
398:
399: Convenience function, so others can use it: Is the problem due in less than 24 hours, and still can be done?
400:
401: =item lastTry()
402:
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?
405:
406: =item advancedUser()
407:
408: This puts a human-readable name on the env variable.
409:
410: =item timeToHumanString()
411:
412: timeToHumanString takes a time number and converts it to a
413: human-readable representation, meant to be used in the following
414: manner:
415:
416: =over 4
417:
418: =item * print "Due $timestring"
419:
420: =item * print "Open $timestring"
421:
422: =item * print "Answer available $timestring"
423:
424: =back
425:
426: Very, very, very, VERY English-only... goodness help a localizer on
427: this func...
428:
429: =item resource()
430:
431: returns 0
432:
433: =item communication_status()
434:
435: returns 1
436:
437: =item quick_status()
438:
439: returns 2
440:
441: =item long_status()
442:
443: returns 3
444:
445: =item part_status_summary()
446:
447: returns 4
448:
449: =item render_resource()
450:
451: =item render_communication_status()
452:
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()
468:
469: =back
470:
471: =cut
472:
473: package Apache::lonnavmaps;
474:
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 Apache::lonmap;
482:
483: use POSIX qw (floor strftime);
484: use Time::HiRes qw( gettimeofday tv_interval );
485: use LONCAPA;
486: use DateTime();
487:
488: # For debugging
489:
490: # use Data::Dumper;
491:
492:
493: # symbolic constants
494: sub SYMB { return 1; }
495: sub URL { return 2; }
496: sub NOTHING { return 3; }
497:
498: # Some data
499:
500: my $resObj = "Apache::lonnavmaps::resource";
501:
502: # Keep these mappings in sync with lonquickgrades, which usesthe colors
503: # instead of the icons.
504: my %statusIconMap =
505: (
506: $resObj->CLOSED => '',
507: $resObj->OPEN => 'navmap.open.gif',
508: $resObj->CORRECT => 'navmap.correct.gif',
509: $resObj->PARTIALLY_CORRECT => 'navmap.partial.gif',
510: $resObj->INCORRECT => 'navmap.wrong.gif',
511: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
512: $resObj->ERROR => ''
513: );
514:
515: my %iconAltTags = #texthash does not work here
516: ( 'navmap.correct.gif' => 'Correct',
517: 'navmap.wrong.gif' => 'Incorrect',
518: 'navmap.open.gif' => 'Is Open',
519: 'navmap.partial.gif' => 'Partially Correct',
520: 'navmap.ellipsis.gif' => 'Attempted',
521: );
522:
523: # Defines a status->color mapping, null string means don't color
524: my %colormap =
525: ( $resObj->NETWORK_FAILURE => '',
526: $resObj->CORRECT => '',
527: $resObj->EXCUSED => '#3333FF',
528: $resObj->PAST_DUE_ANSWER_LATER => '',
529: $resObj->PAST_DUE_NO_ANSWER => '',
530: $resObj->ANSWER_OPEN => '#006600',
531: $resObj->OPEN_LATER => '',
532: $resObj->TRIES_LEFT => '',
533: $resObj->INCORRECT => '',
534: $resObj->OPEN => '',
535: $resObj->NOTHING_SET => '',
536: $resObj->ATTEMPTED => '',
537: $resObj->CREDIT_ATTEMPTED => '',
538: $resObj->ANSWER_SUBMITTED => '',
539: $resObj->PARTIALLY_CORRECT => '#006600'
540: );
541: # And a special case in the nav map; what to do when the assignment
542: # is not yet done and due in less than 24 hours
543: my $hurryUpColor = "#FF0000";
544:
545: my $future_slots_checked = 0;
546: my $future_slots = 0;
547:
548: sub addToFilter {
549: my $hashIn = shift;
550: my $addition = shift;
551: my %hash = %$hashIn;
552: $hash{$addition} = 1;
553:
554: return join (",", keys(%hash));
555: }
556:
557: sub removeFromFilter {
558: my $hashIn = shift;
559: my $subtraction = shift;
560: my %hash = %$hashIn;
561:
562: delete $hash{$subtraction};
563: return join(",", keys(%hash));
564: }
565:
566: sub getLinkForResource {
567: my $stack = shift;
568: my $res;
569:
570: # Check to see if there are any pages in the stack
571: foreach $res (@$stack) {
572: if (defined($res)) {
573: my $anchor;
574: if ($res->is_page()) {
575: foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } }
576: $anchor=&escape($anchor->shown_symb());
577: return ($res->link(),$res->shown_symb(),$anchor);
578: }
579: # in case folder was skipped over as "only sequence"
580: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
581: if ($map=~/\.page$/) {
582: my $url=&Apache::lonnet::clutter($map);
583: $anchor=&escape($res->shown_symb());
584: return ($url,$res->shown_symb(),$anchor);
585: }
586: }
587: }
588:
589: # Failing that, return the src of the last resource that is defined
590: # (when we first recurse on a map, it puts an undefined resource
591: # on the bottom because $self->{HERE} isn't defined yet, and we
592: # want the src for the map anyhow)
593: foreach my $item (@$stack) {
594: if (defined($item)) { $res = $item; }
595: }
596:
597: if ($res) {
598: return ($res->link(),$res->shown_symb());
599: }
600: return;
601: }
602:
603:
604:
605: sub getDescription {
606: my $res = shift;
607: my $part = shift;
608: my $status = $res->status($part);
609:
610: my $open = $res->opendate($part);
611: my $due = $res->duedate($part);
612: my $answer = $res->answerdate($part);
613:
614: if ($status == $res->NETWORK_FAILURE) {
615: return &mt("Having technical difficulties; please check status later");
616: }
617: if ($status == $res->NOTHING_SET) {
618: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Not currently assigned.",$res->symb(),'opendate'),$part);
619: }
620: if ($status == $res->OPEN_LATER) {
621: return &mt("Open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($open,'start'),$res->symb(),'opendate',$part));
622: }
623: if ($res->simpleStatus($part) == $res->OPEN) {
624: unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
625: my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
626: if ($slot_status == $res->UNKNOWN) {
627: return &mt('Reservation status unknown');
628: } elsif ($slot_status == $res->RESERVED) {
629: return &mt('Reserved - ends [_1]',
630: timeToHumanString($slot_time,'end'));
631: } elsif ($slot_status == $res->RESERVED_LOCATION) {
632: return &mt('Reserved - specific location(s) - ends [_1]',
633: timeToHumanString($slot_time,'end'));
634: } elsif ($slot_status == $res->RESERVED_LATER) {
635: return &mt('Reserved - next open [_1]',
636: timeToHumanString($slot_time,'start'));
637: } elsif ($slot_status == $res->RESERVABLE) {
638: return &mt('Reservable ending [_1]',
639: timeToHumanString($slot_time,'end'));
640: } elsif ($slot_status == $res->RESERVABLE_LATER) {
641: return &mt('Reservable starting [_1]',
642: timeToHumanString($slot_time,'start'));
643: } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
644: return &mt('Reserve a time/place to work');
645: } elsif ($slot_status == $res->NOTRESERVABLE) {
646: return &mt('Reservation not available');
647: } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
648: return &mt('Submission in grading queue');
649: }
650: }
651: }
652: if ($status == $res->OPEN) {
653: if ($due) {
654: if ($res->is_practice()) {
655: return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part));
656: } else {
657: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part));
658: }
659: } else {
660: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part);
661: }
662: }
663: if ($status == $res->PAST_DUE_ANSWER_LATER) {
664: return &mt("Answer open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($answer,'start'),$res->symb(),'answerdate',$part));
665: }
666: if ($status == $res->PAST_DUE_NO_ANSWER) {
667: if ($res->is_practice()) {
668: return &mt("Closed [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'answerdate,duedate',$part));
669: } else {
670: return &mt("Was due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'answerdate,duedate',$part));
671: }
672: }
673: if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT)
674: && $res->handgrade($part) ne 'yes') {
675: return &Apache::lonhtmlcommon::direct_parm_link(&mt("Answer available"),$res->symb(),'answerdate,duedate',$part);
676: }
677: if ($status == $res->EXCUSED) {
678: return &mt("Excused by instructor");
679: }
680: if ($status == $res->ATTEMPTED) {
681: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
682: return &mt("Survey submission recorded");
683: } else {
684: return &mt("Answer submitted, not yet graded");
685: }
686: }
687: if ($status == $res->CREDIT_ATTEMPTED) {
688: if ($res->is_anonsurvey($part) || $res->is_survey($part)) {
689: return &mt("Credit for survey submission");
690: }
691: }
692: if ($status == $res->TRIES_LEFT) {
693: my $tries = $res->tries($part);
694: my $maxtries = $res->maxtries($part);
695: my $triesString = "";
696: if ($tries && $maxtries) {
697: $triesString = '<font size="-1"><i>('.&mt('[_1] of [quant,_2,try,tries] used',$tries,$maxtries).')</i></font>';
698: if ($maxtries > 1 && $maxtries - $tries == 1) {
699: $triesString = "<b>$triesString</b>";
700: }
701: }
702: if ($due) {
703: return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)) .
704: " $triesString";
705: } else {
706: return &Apache::lonhtmlcommon::direct_parm_link(&mt("No due date"),$res->symb(),'duedate',$part)." $triesString";
707: }
708: }
709: if ($status == $res->ANSWER_SUBMITTED) {
710: return &mt('Answer submitted');
711: }
712: }
713:
714:
715: sub dueInLessThan24Hours {
716: my $res = shift;
717: my $part = shift;
718: my $status = $res->status($part);
719:
720: return ($status == $res->OPEN() ||
721: $status == $res->TRIES_LEFT()) &&
722: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
723: $res->duedate($part) > time();
724: }
725:
726:
727: sub lastTry {
728: my $res = shift;
729: my $part = shift;
730:
731: my $tries = $res->tries($part);
732: my $maxtries = $res->maxtries($part);
733: return $tries && $maxtries && $maxtries > 1 &&
734: $maxtries - $tries == 1 && $res->duedate($part) &&
735: $res->duedate($part) > time();
736: }
737:
738:
739: sub advancedUser {
740: return $env{'request.role.adv'};
741: }
742:
743: sub timeToHumanString {
744: my ($time,$type,$format) = @_;
745:
746: # zero, '0' and blank are bad times
747: if (!$time) {
748: return &mt('never');
749: }
750: unless (&Apache::lonlocal::current_language()=~/^en/) {
751: return &Apache::lonlocal::locallocaltime($time);
752: }
753: my $now = time();
754:
755: # Positive = future
756: my $delta = $time - $now;
757:
758: my $minute = 60;
759: my $hour = 60 * $minute;
760: my $day = 24 * $hour;
761: my $week = 7 * $day;
762: my $inPast = 0;
763:
764: # Logic in comments:
765: # Is it now? (extremely unlikely)
766: if ( $delta == 0 ) {
767: return "this instant";
768: }
769:
770: if ($delta < 0) {
771: $inPast = 1;
772: $delta = -$delta;
773: }
774:
775: if ( $delta > 0 ) {
776:
777: my $tense = $inPast ? " ago" : "";
778: my $prefix = $inPast ? "" : "in ";
779:
780: # Less than a minute
781: if ( $delta < $minute ) {
782: if ($delta == 1) { return "${prefix}1 second$tense"; }
783: return "$prefix$delta seconds$tense";
784: }
785:
786: # Less than an hour
787: if ( $delta < $hour ) {
788: # If so, use minutes; or minutes, seconds (if format requires)
789: my $minutes = floor($delta / 60);
790: if (($format ne '') && ($format =~ /\%(T|S)/)) {
791: my $display;
792: if ($minutes == 1) {
793: $display = "${prefix}1 minute";
794: } else {
795: $display = "$prefix$minutes minutes";
796: }
797: my $seconds = $delta % $minute;
798: if ($seconds == 0) {
799: $display .= $tense;
800: } elsif ($seconds == 1) {
801: $display .= ", 1 second$tense";
802: } else {
803: $display .= ", $seconds seconds$tense";
804: }
805: return $display;
806: }
807: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
808: return "$prefix$minutes minutes$tense";
809: }
810:
811: # Is it less than 24 hours away? If so,
812: # display hours + minutes, (and + seconds, if format specified it)
813: if ( $delta < $hour * 24) {
814: my $hours = floor($delta / $hour);
815: my $minutes = floor(($delta % $hour) / $minute);
816: my $hourString = "$hours hours";
817: my $minuteString = ", $minutes minutes";
818: if ($hours == 1) {
819: $hourString = "1 hour";
820: }
821: if ($minutes == 1) {
822: $minuteString = ", 1 minute";
823: }
824: if ($minutes == 0) {
825: $minuteString = "";
826: }
827: if (($format ne '') && ($format =~ /\%(T|S)/)) {
828: my $display = "$prefix$hourString$minuteString";
829: my $seconds = $delta-(($hours * $hour)+($minutes * $minute));
830: if ($seconds == 0) {
831: $display .= $tense;
832: } elsif ($seconds == 1) {
833: $display .= ", 1 second$tense";
834: } else {
835: $display .= ", $seconds seconds$tense";
836: }
837: return $display;
838: }
839: return "$prefix$hourString$minuteString$tense";
840: }
841:
842: # Date/time is more than 24 hours away
843:
844: my $dt = DateTime->from_epoch(epoch => $time)
845: ->set_time_zone(&Apache::lonlocal::gettimezone());
846:
847: # If there's a caller supplied format, use it, unless it only displays
848: # H:M:S or H:M.
849:
850: if (($format ne '') && ($format ne '%T') && ($format ne '%R')) {
851: my $timeStr = $dt->strftime($format);
852: return $timeStr.' ('.$dt->time_zone_short_name().')';
853: }
854:
855: # Less than 5 days away, display day of the week and
856: # HH:MM
857:
858: if ( $delta < $day * 5 ) {
859: my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)");
860: $timeStr =~ s/12:00 am/00:00/;
861: $timeStr =~ s/12:00 pm/noon/;
862: return ($inPast ? "last " : "this ") .
863: $timeStr;
864: }
865:
866: my $conjunction='on';
867: if ($type eq 'start') {
868: $conjunction='at';
869: } elsif ($type eq 'end') {
870: $conjunction='by';
871: }
872: # Is it this year?
873: my $dt_now = DateTime->from_epoch(epoch => $now)
874: ->set_time_zone(&Apache::lonlocal::gettimezone());
875: if ( $dt->year() == $dt_now->year()) {
876: # Return on Month Day, HH:MM meridian
877: my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)");
878: $timeStr =~ s/12:00 am/00:00/;
879: $timeStr =~ s/12:00 pm/noon/;
880: return $timeStr;
881: }
882:
883: # Not this year, so show the year
884: my $timeStr =
885: $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)");
886: $timeStr =~ s/12:00 am/00:00/;
887: $timeStr =~ s/12:00 pm/noon/;
888: return $timeStr;
889: }
890: }
891:
892:
893: sub resource { return 0; }
894: sub communication_status { return 1; }
895: sub quick_status { return 2; }
896: sub long_status { return 3; }
897: sub part_status_summary { return 4; }
898:
899: sub render_resource {
900: my ($resource, $part, $params) = @_;
901:
902: my $nonLinkedText = ''; # stuff after resource title not in link
903:
904: my $link = $params->{"resourceLink"};
905:
906: # The URL part is not escaped at this point, but the symb is...
907:
908: my $src = $resource->src();
909: my $it = $params->{"iterator"};
910: my $filter = $it->{FILTER};
911:
912: my $title = $resource->compTitle();
913:
914: my $partLabel = "";
915: my $newBranchText = "";
916: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
917: # If this is a new branch, label it so
918: if ($params->{'isNewBranch'}) {
919: $newBranchText = "<img src='$location/branch.gif' alt=".mt('Branch')." />";
920: }
921:
922: # links to open and close the folder
923:
924: my $whitespace = $location.'/whitespace_21.gif';
925: my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
926: my $linkclose = "</a>";
927:
928: # Default icon: unknown page
929: my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
930:
931: if ($resource->is_problem()) {
932: if ($part eq '0' || $params->{'condensed'}) {
933: $icon = '<img class="LC_contentImage" src="'.$location.'/';
934: if ($resource->is_task()) {
935: $icon .= 'task.gif" alt="'.&mt('Task');
936: } else {
937: $icon .= 'problem.gif" alt="'.&mt('Problem');
938: }
939: $icon .='" />';
940: } else {
941: $icon = $params->{'indentString'};
942: }
943: } else {
944: $icon = "<img class=\"LC_contentImage\" src='".&Apache::loncommon::icon($resource->src)."' alt='' />";
945: }
946:
947: # Display the correct map icon to open or shut map
948: if ($resource->is_map()) {
949: my $mapId = $resource->map_pc();
950: my $nowOpen = !defined($filter->{$mapId});
951: if ($it->{CONDITION}) {
952: $nowOpen = !$nowOpen;
953: }
954:
955: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
956: my $title=$resource->title;
957: $title=~s/\"/\&qout;/g;
958: if (!$params->{'resource_no_folder_link'}) {
959: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
960: $icon = "<img src='$location/arrow." . ($nowOpen ? 'closed' : 'open') . ".gif' alt='' />"
961: ."<img class=\"LC_contentImage\" src='$location/$icon' alt=\""
962: .($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
963: $linkopen = "<a href=\"" . $params->{'url'} . '?' .
964: $params->{'queryString'} . '&filter=';
965: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
966: addToFilter($filter, $mapId) :
967: removeFromFilter($filter, $mapId);
968: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
969: . $params->{'hereType'} . '&here=' .
970: &escape($params->{'here'}) .
971: '&jump=' .
972: &escape($resource->symb()) .
973: "&folderManip=1\">";
974:
975: } else {
976: # Don't allow users to manipulate folder
977: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
978: $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
979:
980: $linkopen = "";
981: $linkclose = "";
982: }
983: }
984:
985: if ($resource->randomout()) {
986: $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
987: }
988: if (!$resource->condval()) {
989: $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
990: }
991: if (($resource->is_practice()) && ($resource->is_raw_problem())) {
992: $nonLinkedText .=' <font color="green"><b>'.&mt('not graded').'</b></font>';
993: }
994:
995: # We're done preparing and finally ready to start the rendering
996: my $result = '<td class="LC_middle">';
997: my $newfolderType = $resource->is_sequence() ? 'folder' : 'page';
998:
999: my $indentLevel = $params->{'indentLevel'};
1000: if ($newBranchText) { $indentLevel--; }
1001:
1002: # print indentation
1003: for (my $i = 0; $i < $indentLevel; $i++) {
1004: $result .= $params->{'indentString'};
1005: }
1006:
1007: # Decide what to display
1008: $result .= "$newBranchText$linkopen$icon$linkclose";
1009:
1010: my $curMarkerBegin = '';
1011: my $curMarkerEnd = '';
1012:
1013: # Is this the current resource?
1014: if (!$params->{'displayedHereMarker'} &&
1015: $resource->symb() eq $params->{'here'} ) {
1016: $curMarkerBegin = '<em>';
1017: $curMarkerEnd = '</em>';
1018: $params->{'displayedHereMarker'} = 1;
1019: }
1020:
1021: if ($resource->is_problem() && $part ne '0' &&
1022: !$params->{'condensed'}) {
1023: my $displaypart=$resource->part_display($part);
1024: $partLabel = " (".&mt('Part: [_1]', $displaypart).")";
1025: if ($link!~/\#/) { $link.='#'.&escape($part); }
1026: $title = "";
1027: }
1028:
1029: if ($params->{'condensed'} && $resource->countParts() > 1) {
1030: $nonLinkedText .= ' ('.&mt('[_1] parts', $resource->countParts()).')';
1031: }
1032:
1033: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1034: $result .= "$curMarkerBegin<a href=\"$link\">$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1035: } else {
1036: $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$nonLinkedText</td>";
1037: }
1038:
1039: return $result;
1040: }
1041:
1042: sub render_communication_status {
1043: my ($resource, $part, $params) = @_;
1044: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1045:
1046: my $link = $params->{"resourceLink"};
1047: my $linkopen = "<a href=\"$link\">";
1048: my $linkclose = "</a>";
1049: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1050: if ($resource->hasDiscussion()) {
1051: $discussionHTML = $linkopen .
1052: '<img alt="'.&mt('New Discussion').'" src="'.$location.'/chat.gif" title="'.&mt('New Discussion').'"/>' .
1053: $linkclose;
1054: }
1055:
1056: if ($resource->getFeedback()) {
1057: my $feedback = $resource->getFeedback();
1058: foreach my $msgid (split(/\,/, $feedback)) {
1059: if ($msgid) {
1060: $feedbackHTML .= ' <a href="/adm/email?display='
1061: . &escape($msgid) . '">'
1062: . '<img alt="'.&mt('New E-mail').'" src="'.$location.'/feedback.gif" title="'.&mt('New E-mail').'"/></a>';
1063: }
1064: }
1065: }
1066:
1067: if ($resource->getErrors()) {
1068: my $errors = $resource->getErrors();
1069: my $errorcount = 0;
1070: foreach my $msgid (split(/,/, $errors)) {
1071: last if ($errorcount>=10); # Only output 10 bombs maximum
1072: if ($msgid) {
1073: $errorcount++;
1074: $errorHTML .= ' <a href="/adm/email?display='
1075: . &escape($msgid) . '">'
1076: . '<img alt="'.&mt('New Error').'" src="'.$location.'/bomb.gif" title="'.&mt('New Error').'"/></a>';
1077: }
1078: }
1079: }
1080:
1081: if ($params->{'multipart'} && $part != '0') {
1082: $discussionHTML = $feedbackHTML = $errorHTML = '';
1083: }
1084: return "<td class=\"LC_middle\">$discussionHTML$feedbackHTML$errorHTML </td>";
1085:
1086: }
1087: sub render_quick_status {
1088: my ($resource, $part, $params) = @_;
1089: my $result = "";
1090: my $firstDisplayed = !$params->{'condensed'} &&
1091: $params->{'multipart'} && $part eq "0";
1092:
1093: my $link = $params->{"resourceLink"};
1094: my $linkopen = "<a href=\"$link\">";
1095: my $linkclose = "</a>";
1096:
1097: $result .= '<td class="LC_middle">';
1098: if ($resource->is_problem() &&
1099: !$firstDisplayed) {
1100: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1101: my $alt = $iconAltTags{$icon};
1102: if ($icon) {
1103: my $location=
1104: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1105: $result .= $linkopen.'<img src="'.$location.'" alt="'.&mt($alt).'" title="'.&mt($alt).'" />'.$linkclose;
1106: } else {
1107: $result .= " ";
1108: }
1109: } else { # not problem, no icon
1110: $result .= " ";
1111: }
1112: $result .= "</td>\n";
1113: return $result;
1114: }
1115: sub render_long_status {
1116: my ($resource, $part, $params) = @_;
1117: my $result = '<td class="LC_middle LC_right">';
1118: my $firstDisplayed = !$params->{'condensed'} &&
1119: $params->{'multipart'} && $part eq "0";
1120:
1121: my $color;
1122: if ($resource->is_problem() || $resource->is_practice()) {
1123: $color = $colormap{$resource->status};
1124:
1125: if (dueInLessThan24Hours($resource, $part) ||
1126: lastTry($resource, $part)) {
1127: $color = $hurryUpColor;
1128: }
1129: }
1130:
1131: if ($resource->kind() eq "res" &&
1132: $resource->is_raw_problem() &&
1133: !$firstDisplayed) {
1134: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1135: $result .= getDescription($resource, $part);
1136: if ($color) {$result .= "</b></font>"; }
1137: }
1138: if ($resource->is_map()) {
1139: if (&Apache::lonnet::allowed('mdc')) {
1140: if ($resource->symb=~/\_\_\_[^\_]+\_\_\_uploaded/) {
1141: $result.=" <a href='/adm/coursedocs?command=direct&symb=".&escape($resource->symb())."'>".
1142: "<span class='LC_setting'>".&mt("Edit Content").'</span></a> ';
1143: }
1144: }
1145: }
1146: if ($resource->is_map() && &advancedUser() && $resource->randompick()) {
1147: $result .= &mt('(randomly select [_1])', $resource->randompick());
1148: }
1149: if ($resource->is_map() && &advancedUser() && $resource->randomorder()) {
1150: $result .= &mt('(randomly ordered)');
1151: }
1152:
1153: # Debugging code
1154: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1155: # ' - Part: ' . $part;
1156:
1157: $result .= "</td>\n";
1158:
1159: return $result;
1160: }
1161:
1162: # Colors obtained by taking the icons, matching the colors, and
1163: # possibly reducing the Value (HSV) of the color, if it's too bright
1164: # for text, generally by one third or so.
1165: my %statusColors =
1166: (
1167: $resObj->CLOSED => '#000000',
1168: $resObj->OPEN => '#998b13',
1169: $resObj->CORRECT => '#26933f',
1170: $resObj->INCORRECT => '#c48207',
1171: $resObj->ATTEMPTED => '#a87510',
1172: $resObj->ERROR => '#000000'
1173: );
1174: my %statusStrings =
1175: (
1176: $resObj->CLOSED => 'Not yet open',
1177: $resObj->OPEN => 'Open',
1178: $resObj->CORRECT => 'Correct',
1179: $resObj->INCORRECT => 'Incorrect',
1180: $resObj->ATTEMPTED => 'Attempted',
1181: $resObj->ERROR => 'Network Error'
1182: );
1183: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1184:
1185: sub render_parts_summary_status {
1186: my ($resource, $part, $params) = @_;
1187: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1188: if ($params->{showParts}) {
1189: return '<td></td>';
1190: }
1191:
1192: my $td = "<td align='right'>\n";
1193: my $endtd = "</td>\n";
1194: my @probs;
1195:
1196: if ($resource->contains_problem) {
1197: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1198: } else {
1199: @probs=($resource);
1200: }
1201: my $return;
1202: my %overallstatus;
1203: my $totalParts;
1204: foreach my $resource (@probs) {
1205: # If there is a single part, just show the simple status
1206: if ($resource->singlepart()) {
1207: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1208: $overallstatus{$status}++;
1209: $totalParts++;
1210: next;
1211: }
1212: # Now we can be sure the $part doesn't really matter.
1213: my $statusCount = $resource->simpleStatusCount();
1214: my @counts;
1215: foreach my $status (@statuses) {
1216: # decouple display order from the simpleStatusCount order
1217: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1218: if ($statusCount->[$slot]) {
1219: $overallstatus{$status}+=$statusCount->[$slot];
1220: $totalParts+=$statusCount->[$slot];
1221: }
1222: }
1223: }
1224: $return.= $td . $totalParts . ' parts: ';
1225: foreach my $status (@statuses) {
1226: if ($overallstatus{$status}) {
1227: $return.="<font color='" . $statusColors{$status} .
1228: "'>" . $overallstatus{$status} . ' '
1229: . $statusStrings{$status} . "</font>";
1230: }
1231: }
1232: $return.= $endtd;
1233: return $return;
1234: }
1235:
1236: my @preparedColumns = (\&render_resource, \&render_communication_status,
1237: \&render_quick_status, \&render_long_status,
1238: \&render_parts_summary_status);
1239:
1240: sub setDefault {
1241: my ($val, $default) = @_;
1242: if (!defined($val)) { return $default; }
1243: return $val;
1244: }
1245:
1246: sub cmp_title {
1247: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1248: $atitle=~s/^\s*//;
1249: $btitle=~s/^\s*//;
1250: return $atitle cmp $btitle;
1251: }
1252:
1253: sub render {
1254: my $args = shift;
1255: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1256: my $result = '';
1257: # Configure the renderer.
1258: my $cols = $args->{'cols'};
1259: if (!defined($cols)) {
1260: # no columns, no nav maps.
1261: return '';
1262: }
1263: my $navmap;
1264: if (defined($args->{'navmap'})) {
1265: $navmap = $args->{'navmap'};
1266: }
1267:
1268: my $r = $args->{'r'};
1269: my $queryString = $args->{'queryString'};
1270: my $jump = $args->{'jump'};
1271: my $here = $args->{'here'};
1272: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1273: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1274: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1275: # before the current resource when using #current
1276:
1277: # If we were passed 'here' information, we are not rendering
1278: # after a folder manipulation, and we were not passed an
1279: # iterator, make sure we open the folders to show the "here"
1280: # marker
1281: my $filterHash = {};
1282: # Figure out what we're not displaying
1283: foreach my $item (split(/\,/, $env{"form.filter"})) {
1284: if ($item) {
1285: $filterHash->{$item} = "1";
1286: }
1287: }
1288:
1289: # Filter: Remember filter function and add our own filter: Refuse
1290: # to show hidden resources unless the user can see them.
1291: my $userCanSeeHidden = advancedUser();
1292: my $filterFunc = setDefault($args->{'filterFunc'},
1293: sub {return 1;});
1294: if (!$userCanSeeHidden) {
1295: # Without renaming the filterfunc, the server seems to go into
1296: # an infinite loop
1297: my $oldFilterFunc = $filterFunc;
1298: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1299: &$oldFilterFunc($res);};
1300: }
1301:
1302: my $condition = 0;
1303: if ($env{'form.condition'}) {
1304: $condition = 1;
1305: }
1306:
1307: if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
1308: # Step 1: Check to see if we have a navmap
1309: if (!defined($navmap)) {
1310: $navmap = Apache::lonnavmaps::navmap->new();
1311: if (!defined($navmap)) {
1312: # no longer in course
1313: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1314: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1315: }
1316: }
1317:
1318: # Step two: Locate what kind of here marker is necessary
1319: # Determine where the "here" marker is and where the screen jumps to.
1320:
1321: if ($env{'form.postsymb'} ne '') {
1322: $here = $jump = &Apache::lonnet::symbclean($env{'form.postsymb'});
1323: } elsif ($env{'form.postdata'} ne '') {
1324: # couldn't find a symb, is there a URL?
1325: my $currenturl = $env{'form.postdata'};
1326: #$currenturl=~s/^http\:\/\///;
1327: #$currenturl=~s/^[^\/]+//;
1328:
1329: $here = $jump = &Apache::lonnet::symbread($currenturl);
1330: }
1331: if ($here eq '') {
1332: my $last;
1333: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
1334: &GDBM_READER(),0640)) {
1335: $last=$hash{'last_known'};
1336: untie(%hash);
1337: }
1338: if ($last) { $here = $jump = $last; }
1339: }
1340:
1341: # Step three: Ensure the folders are open
1342: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1343: my $curRes;
1344: my $found = 0;
1345:
1346: # We only need to do this if we need to open the maps to show the
1347: # current position. This will change the counter so we can't count
1348: # for the jump marker with this loop.
1349: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1350: if (ref($curRes) && $curRes->symb() eq $here) {
1351: my $mapStack = $mapIterator->getStack();
1352:
1353: # Ensure the parent maps are open
1354: for my $map (@{$mapStack}) {
1355: if ($condition) {
1356: undef $filterHash->{$map->map_pc()};
1357: } else {
1358: $filterHash->{$map->map_pc()} = 1;
1359: }
1360: }
1361: $found = 1;
1362: }
1363: }
1364: }
1365:
1366: if ( !defined($args->{'iterator'}) && $env{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1367: # If this is a click on a folder or something, we want to preserve the "here"
1368: # from the querystring, and get the new "jump" marker
1369: $here = $env{'form.here'};
1370: $jump = $env{'form.jump'};
1371: }
1372:
1373: my $it = $args->{'iterator'};
1374: if (!defined($it)) {
1375: # Construct a default iterator based on $env{'form.'} information
1376:
1377: # Step 1: Check to see if we have a navmap
1378: if (!defined($navmap)) {
1379: $navmap = Apache::lonnavmaps::navmap->new();
1380: if (!defined($navmap)) {
1381: # no longer in course
1382: return '<span class="LC_error">'.&mt('No course selected').'</span><br />
1383: <a href="/adm/roles">'.&mt('Select a course').'</a><br />';
1384: }
1385: }
1386:
1387: # See if we're being passed a specific map
1388: if ($args->{'iterator_map'}) {
1389: my $map = $args->{'iterator_map'};
1390: $map = $navmap->getResourceByUrl($map);
1391: my $firstResource = $map->map_start();
1392: my $finishResource = $map->map_finish();
1393:
1394: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1395: } else {
1396: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
1397: }
1398: }
1399:
1400:
1401: # (re-)Locate the jump point, if any
1402: # Note this does not take filtering or hidden into account... need
1403: # to be fixed?
1404: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1405: my $curRes;
1406: my $foundJump = 0;
1407: my $counter = 0;
1408:
1409: while (($curRes = $mapIterator->next()) && !$foundJump) {
1410: if (ref($curRes)) { $counter++; }
1411:
1412: if (ref($curRes) && $jump eq $curRes->symb()) {
1413:
1414: # This is why we have to use the main iterator instead of the
1415: # potentially faster DFS: The count has to be the same, so
1416: # the order has to be the same, which DFS won't give us.
1417: $args->{'currentJumpIndex'} = $counter;
1418: $foundJump = 1;
1419: }
1420: }
1421:
1422: my $showParts = setDefault($args->{'showParts'}, 1);
1423: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1424: # keeps track of when the current resource is found,
1425: # so we can back up a few and put the anchor above the
1426: # current resource
1427: my $printKey = $args->{'printKey'};
1428: my $printCloseAll = $args->{'printCloseAll'};
1429: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1430:
1431: # Print key?
1432: if ($printKey) {
1433: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1434: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1435: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1436: if ($navmap->{LAST_CHECK}) {
1437: $result .=
1438: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('New discussion since').' '.
1439: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1440: '</td><td align="center" valign="bottom"> '.
1441: '<img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').'<p>'.
1442: '</td>';
1443: } else {
1444: $result .= '<td align="center" valign="bottom"> '.
1445: '<img src="'.$location.'/chat.gif" alt="" /> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1446: ' <img src="'.$location.'/feedback.gif" alt="" /> '.&mt('New message (click to open)').
1447: '</td>';
1448: }
1449:
1450: $result .= '</tr></table>';
1451: }
1452:
1453: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1454: my ($link,$text);
1455: if ($condition) {
1456: $link='navmaps?condition=0&filter=&'.$queryString.
1457: '&here='.&escape($here);
1458: $text='Close all folders';
1459: } else {
1460: $link='navmaps?condition=1&filter=&'.$queryString.
1461: '&here='.&escape($here);
1462: $text='Open all folders';
1463: }
1464: if ($env{'form.register'}) {
1465: $link .= '&register='.$env{'form.register'};
1466: }
1467: if ($args->{'caller'} eq 'navmapsdisplay') {
1468: &add_linkitem($args->{'linkitems'},'changefolder',
1469: "location.href='$link'",$text);
1470: } else {
1471: $result.= '<a href="'.$link.'">'.&mt($text).'</a>';
1472: }
1473: $result .= "\n";
1474: }
1475:
1476: # Check for any unread discussions in all resources.
1477: if ($args->{'caller'} eq 'navmapsdisplay') {
1478: &add_linkitem($args->{'linkitems'},'clearbubbles',
1479: 'document.clearbubbles.submit()',
1480: 'Mark all posts read');
1481: my $time=time;
1482: $result .= (<<END);
1483: <form name="clearbubbles" method="post" action="/adm/feedback">
1484: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1485: <input type="hidden" name="navtime" value="$time" />
1486: END
1487: if ($env{'form.register'}) {
1488: $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
1489: }
1490: if ($args->{'sort'} eq 'discussion') {
1491: my $totdisc = 0;
1492: my $haveDisc = '';
1493: my @allres=$navmap->retrieveResources();
1494: foreach my $resource (@allres) {
1495: if ($resource->hasDiscussion()) {
1496: $haveDisc .= $resource->wrap_symb().':';
1497: $totdisc ++;
1498: }
1499: }
1500: if ($totdisc > 0) {
1501: $haveDisc =~ s/:$//;
1502: $result .= (<<END);
1503: <input type="hidden" name="navmaps" value="$haveDisc" />
1504: </form>
1505: END
1506: }
1507: }
1508: $result.='</form>';
1509: }
1510:
1511: if ($args->{'caller'} eq 'navmapsdisplay') {
1512: $result .= '<table><tr><td>'.
1513: &Apache::loncommon::help_open_menu('Navigation Screen','Navigation_Screen',undef,'RAT').'</td>';
1514: $result .= '<td> </td>';
1515: $result.='<td class="LC_middle">'.&mt('Tools:').'</td>';
1516: $result.=&show_linkitems_toolbar($args->{'linkitems'});
1517: if ($args->{'sort_html'}) {
1518: $result.='<td> </td><td> </td><td> </td>'.
1519: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1520: }
1521: $result .= '</table>';
1522: } elsif ($args->{'sort_html'}) {
1523: $result.=$args->{'sort_html'};
1524: }
1525:
1526: #$result .= "<br />\n";
1527: if ($r) {
1528: $r->print($result);
1529: $r->rflush();
1530: $result = "";
1531: }
1532: # End parameter setting
1533:
1534: $result .= "<br />\n";
1535:
1536: # Data
1537: $result.=&Apache::loncommon::start_data_table("LC_tableOfContent");
1538:
1539: my $res = "Apache::lonnavmaps::resource";
1540: my %condenseStatuses =
1541: ( $res->NETWORK_FAILURE => 1,
1542: $res->NOTHING_SET => 1,
1543: $res->CORRECT => 1 );
1544:
1545: # Shared variables
1546: $args->{'counter'} = 0; # counts the rows
1547: $args->{'indentLevel'} = 0;
1548: $args->{'isNewBranch'} = 0;
1549: $args->{'condensed'} = 0;
1550:
1551: my $location = &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace_21.gif");
1552: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
1553: $args->{'displayedHereMarker'} = 0;
1554:
1555: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1556: # since structure actually doesn't matter, except what map has what resources.
1557: if ($args->{'suppressEmptySequences'}) {
1558: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1559: $it->{FIRST_RESOURCE},
1560: $it->{FINISH_RESOURCE},
1561: {}, undef, 1);
1562: my $depth = 0;
1563: $dfsit->next();
1564: my $curRes = $dfsit->next();
1565: while ($depth > -1) {
1566: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1567: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1568:
1569: if (ref($curRes)) {
1570: # Parallel pre-processing: Do sequences have non-filtered-out children?
1571: if ($curRes->is_map()) {
1572: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1573: # Sequences themselves do not count as visible children,
1574: # unless those sequences also have visible children.
1575: # This means if a sequence appears, there's a "promise"
1576: # that there's something under it if you open it, somewhere.
1577: } else {
1578: # Not a sequence: if it's filtered, ignore it, otherwise
1579: # rise up the stack and mark the sequences as having children
1580: if (&$filterFunc($curRes)) {
1581: for my $sequence (@{$dfsit->getStack()}) {
1582: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1583: }
1584: }
1585: }
1586: }
1587: } continue {
1588: $curRes = $dfsit->next();
1589: }
1590: }
1591:
1592: my $displayedJumpMarker = 0;
1593: # Set up iteration.
1594: my $now = time();
1595: my $in24Hours = $now + 24 * 60 * 60;
1596: my $rownum = 0;
1597:
1598: # export "here" marker information
1599: $args->{'here'} = $here;
1600:
1601: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1602: my @resources;
1603: my $code='';# sub { !(shift->is_map();) };
1604: if ($args->{'sort'} eq 'title') {
1605: my $oldFilterFunc = $filterFunc;
1606: my $filterFunc=
1607: sub {
1608: my ($res)=@_;
1609: if ($res->is_map()) { return 0;}
1610: return &$oldFilterFunc($res);
1611: };
1612: @resources=$navmap->retrieveResources(undef,$filterFunc);
1613: @resources= sort { &cmp_title($a,$b) } @resources;
1614: } elsif ($args->{'sort'} eq 'duedate') {
1615: my $oldFilterFunc = $filterFunc;
1616: my $filterFunc=
1617: sub {
1618: my ($res)=@_;
1619: if (!$res->is_problem()) { return 0;}
1620: return &$oldFilterFunc($res);
1621: };
1622: @resources=$navmap->retrieveResources(undef,$filterFunc);
1623: @resources= sort {
1624: if ($a->duedate ne $b->duedate) {
1625: return $a->duedate cmp $b->duedate;
1626: }
1627: my $value=&cmp_title($a,$b);
1628: return $value;
1629: } @resources;
1630: } elsif ($args->{'sort'} eq 'discussion') {
1631: my $oldFilterFunc = $filterFunc;
1632: my $filterFunc=
1633: sub {
1634: my ($res)=@_;
1635: if (!$res->hasDiscussion() &&
1636: !$res->getFeedback() &&
1637: !$res->getErrors()) { return 0;}
1638: return &$oldFilterFunc($res);
1639: };
1640: @resources=$navmap->retrieveResources(undef,$filterFunc);
1641: @resources= sort { &cmp_title($a,$b) } @resources;
1642: } else {
1643: #unknow sort mechanism or default
1644: undef($args->{'sort'});
1645: }
1646:
1647:
1648: while (1) {
1649: if ($args->{'sort'}) {
1650: $curRes = shift(@resources);
1651: } else {
1652: $curRes = $it->next($closeAllPages);
1653:
1654: }
1655: if (!$curRes) { last; }
1656:
1657: # Maintain indentation level.
1658: if ($curRes == $it->BEGIN_MAP() ||
1659: $curRes == $it->BEGIN_BRANCH() ) {
1660: $args->{'indentLevel'}++;
1661: }
1662: if ($curRes == $it->END_MAP() ||
1663: $curRes == $it->END_BRANCH() ) {
1664: $args->{'indentLevel'}--;
1665: }
1666: # Notice new branches
1667: if ($curRes == $it->BEGIN_BRANCH()) {
1668: $args->{'isNewBranch'} = 1;
1669: }
1670:
1671: # If this isn't an actual resource, continue on
1672: if (!ref($curRes)) {
1673: next;
1674: }
1675:
1676: # If this has been filtered out, continue on
1677: if (!(&$filterFunc($curRes))) {
1678: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1679: next;
1680: }
1681:
1682: # If this is an empty sequence and we're filtering them, continue on
1683: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1684: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1685: next;
1686: }
1687:
1688: # If we're suppressing navmaps and this is a navmap, continue on
1689: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1690: next;
1691: }
1692:
1693: $args->{'counter'}++;
1694:
1695: # Does it have multiple parts?
1696: $args->{'multipart'} = 0;
1697: $args->{'condensed'} = 0;
1698: my @parts;
1699:
1700: # Decide what parts to show.
1701: if ($curRes->is_problem() && $showParts) {
1702: @parts = @{$curRes->parts()};
1703: $args->{'multipart'} = $curRes->multipart();
1704:
1705: if ($condenseParts) { # do the condensation
1706: if (!$args->{'condensed'}) {
1707: # Decide whether to condense based on similarity
1708: my $status = $curRes->status($parts[0]);
1709: my $due = $curRes->duedate($parts[0]);
1710: my $open = $curRes->opendate($parts[0]);
1711: my $statusAllSame = 1;
1712: my $dueAllSame = 1;
1713: my $openAllSame = 1;
1714: for (my $i = 1; $i < scalar(@parts); $i++) {
1715: if ($curRes->status($parts[$i]) != $status){
1716: $statusAllSame = 0;
1717: }
1718: if ($curRes->duedate($parts[$i]) != $due ) {
1719: $dueAllSame = 0;
1720: }
1721: if ($curRes->opendate($parts[$i]) != $open) {
1722: $openAllSame = 0;
1723: }
1724: }
1725: # $*allSame is true if all the statuses were
1726: # the same. Now, if they are all the same and
1727: # match one of the statuses to condense, or they
1728: # are all open with the same due date, or they are
1729: # all OPEN_LATER with the same open date, display the
1730: # status of the first non-zero part (to get the 'correct'
1731: # status right, since 0 is never 'correct' or 'open').
1732: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1733: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1734: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1735: @parts = ($parts[0]);
1736: $args->{'condensed'} = 1;
1737: }
1738: }
1739: # Multipart problem with one part: always "condense" (happens
1740: # to match the desirable behavior)
1741: if ($curRes->countParts() == 1) {
1742: @parts = ($parts[0]);
1743: $args->{'condensed'} = 1;
1744: }
1745: }
1746: }
1747:
1748: # If the multipart problem was condensed, "forget" it was multipart
1749: if (scalar(@parts) == 1) {
1750: $args->{'multipart'} = 0;
1751: } else {
1752: # Add part 0 so we display it correctly.
1753: unshift @parts, '0';
1754: }
1755:
1756: {
1757: my ($src,$symb,$anchor,$stack);
1758: if ($args->{'sort'}) {
1759: my $it = $navmap->getIterator(undef, undef, undef, 1);
1760: while ( my $res=$it->next()) {
1761: if (ref($res) &&
1762: $res->symb() eq $curRes->symb()) { last; }
1763: }
1764: $stack=$it->getStack();
1765: } else {
1766: $stack=$it->getStack();
1767: }
1768: ($src,$symb,$anchor)=getLinkForResource($stack);
1769: if (defined($anchor)) { $anchor='#'.$anchor; }
1770: my $srcHasQuestion = $src =~ /\?/;
1771: $args->{"resourceLink"} = $src.
1772: ($srcHasQuestion?'&':'?') .
1773: 'symb=' . &escape($symb).$anchor;
1774: }
1775: # Now, we've decided what parts to show. Loop through them and
1776: # show them.
1777: foreach my $part (@parts) {
1778: $rownum ++;
1779:
1780: $result .= &Apache::loncommon::start_data_table_row();
1781:
1782: # Set up some data about the parts that the cols might want
1783: my $filter = $it->{FILTER};
1784:
1785: # Now, display each column.
1786: foreach my $col (@$cols) {
1787: my $colHTML = '';
1788: if (ref($col)) {
1789: $colHTML .= &$col($curRes, $part, $args);
1790: } else {
1791: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1792: }
1793:
1794: # If this is the first column and it's time to print
1795: # the anchor, do so
1796: if ($col == $cols->[0] &&
1797: $args->{'counter'} == $args->{'currentJumpIndex'} -
1798: $currentJumpDelta) {
1799: # Jam the anchor after the <td> tag;
1800: # necessary for valid HTML (which Mozilla requires)
1801: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1802: $displayedJumpMarker = 1;
1803: }
1804: $result .= $colHTML . "\n";
1805: }
1806: $result .= &Apache::loncommon::end_data_table_row();
1807: $args->{'isNewBranch'} = 0;
1808: }
1809:
1810: if ($r && $rownum % 20 == 0) {
1811: $r->print($result);
1812: $result = "";
1813: $r->rflush();
1814: }
1815: } continue {
1816: if ($r) {
1817: # If we have the connection, make sure the user is still connected
1818: my $c = $r->connection;
1819: if ($c->aborted()) {
1820: # Who cares what we do, nobody will see it anyhow.
1821: return '';
1822: }
1823: }
1824: }
1825:
1826: # Print out the part that jumps to #curloc if it exists
1827: # delay needed because the browser is processing the jump before
1828: # it finishes rendering, so it goes to the wrong place!
1829: # onload might be better, but this routine has no access to that.
1830: # On mozilla, the 0-millisecond timeout seems to prevent this;
1831: # it's quite likely this might fix other browsers, too, and
1832: # certainly won't hurt anything.
1833: if ($displayedJumpMarker) {
1834: $result .= &Apache::lonhtmlcommon::scripttag("
1835: if (location.href.indexOf('#curloc')==-1) {
1836: setTimeout(\"location += '#curloc';\", 0)
1837: }
1838: ");
1839: }
1840:
1841: $result.=&Apache::loncommon::end_data_table();
1842:
1843: if ($r) {
1844: $r->print($result);
1845: $result = "";
1846: $r->rflush();
1847: }
1848:
1849: return $result;
1850: }
1851:
1852: sub add_linkitem {
1853: my ($linkitems,$name,$cmd,$text)=@_;
1854: $$linkitems{$name}{'cmd'}=$cmd;
1855: $$linkitems{$name}{'text'}=&mt($text);
1856: }
1857:
1858: sub show_linkitems_toolbar {
1859: my ($linkitems,$condition)=@_;
1860: my @linkorder = ('firsthomework','everything','uncompleted',
1861: 'changefolder','clearbubbles');
1862: my $result .='<td align="left">'."\n".
1863: '<span class="LC_nobreak">'."\n".
1864: '<ul id="LC_toolbar">';
1865: foreach my $link (@linkorder) {
1866: my $link_id = 'LC_content_toolbar_'.$link;
1867: if (defined($linkitems->{$link})) {
1868: if ($linkitems->{$link}{'text'} ne '') {
1869: $linkitems->{$link}{'cmd'}=~s/"/'/g;
1870: if ($linkitems->{$link}{'cmd'}) {
1871: if ($link eq 'changefolder') {
1872: if ($condition) {
1873: $link_id='LC_content_toolbar_changefolder_toggled';
1874: } else {
1875: $link_id='LC_content_toolbar_changefolder';
1876: }
1877: }
1878: $result .= '<li><a href="#" '.
1879: 'onclick="'.$linkitems->{$link}{'cmd'}.'" '.
1880: 'id="'.$link_id.'" '.
1881: 'class="LC_toolbarItem" '.
1882: 'title="'.$linkitems->{$link}{'text'}.'">'.
1883: '</a></li>'."\n";
1884: }
1885: }
1886: }
1887: }
1888: $result .= '</ul>'.
1889: '</span></td>'."\n";
1890: return $result;
1891: }
1892:
1893:
1894: 1;
1895:
1896:
1897:
1898:
1899:
1900:
1901:
1902:
1903:
1904: package Apache::lonnavmaps::navmap;
1905:
1906: =pod
1907:
1908: =head1 Object: Apache::lonnavmaps::navmap
1909:
1910: =head2 Overview
1911:
1912: The navmap object's job is to provide access to the resources
1913: in the course as Apache::lonnavmaps::resource objects, and to
1914: query and manage the relationship between those resource objects.
1915:
1916: Generally, you'll use the navmap object in one of three basic ways.
1917: In order of increasing complexity and power:
1918:
1919: =over 4
1920:
1921: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb> or B<MapPc> and getResourceByUrl. This provides
1922: various ways to obtain resource objects, based on various identifiers.
1923: Use this when you want to request information about one object or
1924: a handful of resources you already know the identities of, from some
1925: other source. For more about Ids, Symbs, and MapPcs, see the
1926: Resource documentation. Note that Url should be a B<last resort>,
1927: not your first choice; it only really works when there is only one
1928: instance of the resource in the course, which only applies to
1929: maps, and even that may change in the future (see the B<getResourceByUrl>
1930: documentation for more details.)
1931:
1932: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1933: retrieves resources matching some criterion and returns them
1934: in a flat array, with no structure information. Use this when
1935: you are manipulating a series of resources, based on what map
1936: the are in, but do not care about branching, or exactly how
1937: the maps and resources are related. This is the most common case.
1938:
1939: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
1940: the course's navmap in various ways without writing the traversal
1941: code yourself. See iterator documentation below. Use this when
1942: you need to know absolutely everything about the course, including
1943: branches and the precise relationship between maps and resources.
1944:
1945: =back
1946:
1947: =head2 Creation And Destruction
1948:
1949: To create a navmap object, use the following function:
1950:
1951: =over 4
1952:
1953: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
1954:
1955: Creates a new navmap object. Returns the navmap object if this is
1956: successful, or B<undef> if not.
1957:
1958: =back
1959:
1960: =head2 Methods
1961:
1962: =over 4
1963:
1964: =item * B<getIterator>(first, finish, filter, condition):
1965:
1966: See iterator documentation below.
1967:
1968: =cut
1969:
1970: use strict;
1971: use GDBM_File;
1972: use Apache::lonnet;
1973: use LONCAPA;
1974:
1975: sub new {
1976: # magic invocation to create a class instance
1977: my $proto = shift;
1978: my $class = ref($proto) || $proto;
1979: my $self = {};
1980: bless($self); # So we can call change_user if neceesary
1981:
1982: $self->{USERNAME} = shift || $env{'user.name'};
1983: $self->{DOMAIN} = shift || $env{'user.domain'};
1984:
1985:
1986:
1987: # Resource cache stores navmap resources as we reference them. We generate
1988: # them on-demand so we don't pay for creating resources unless we use them.
1989: $self->{RESOURCE_CACHE} = {};
1990:
1991: # Network failure flag, if we accessed the course or user opt and
1992: # failed
1993: $self->{NETWORK_FAILURE} = 0;
1994:
1995: # We can only tie the nav hash as done below if the username/domain
1996: # match the env one. Otherwise change_user does everything we need...since we can't
1997: # assume there are course hashes for the specific requested user@domamin:
1998: #
1999:
2000: if ( ($self->{USERNAME} eq $env{'user.name'}) && ($self->{DOMAIN} eq $env{'user.domain'})) {
2001:
2002: # tie the nav hash
2003:
2004: my %navmaphash;
2005: my %parmhash;
2006: my $courseFn = $env{"request.course.fn"};
2007: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2008: &GDBM_READER(), 0640))) {
2009: return undef;
2010: }
2011:
2012: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2013: &GDBM_READER(), 0640)))
2014: {
2015: untie %{$self->{PARM_HASH}};
2016: return undef;
2017: }
2018:
2019: $self->{NAV_HASH} = \%navmaphash;
2020: $self->{PARM_HASH} = \%parmhash;
2021: $self->{PARM_CACHE} = {};
2022: } else {
2023: $self->change_user($self->{USERNAME}, $self->{DOMAIN});
2024: }
2025:
2026: my $d = Data::Dumper->new([$self]);
2027:
2028: return $self;
2029: }
2030:
2031: #
2032: # In some instances it is useful to be able to dynamically change the
2033: # username/domain associated with a navmap (e.g. to navigate for someone
2034: # else besides the current user...if sufficiently privileged.
2035: # Parameters:
2036: # user - New user.
2037: # domain- Domain the user belongs to.
2038: # Implicit inputs:
2039: #
2040: sub change_user {
2041: my $self = shift;
2042: $self->{USERNAME} = shift;
2043: $self->{DOMAIN} = shift;
2044:
2045: # If the hashes are already tied make sure to break that bond:
2046:
2047: untie %{$self->{NAV_HASH}};
2048: untie %{$self->{PARM_HASH}};
2049:
2050: # The assumption is that we have to
2051: # use lonmap here to re-read the hash and from it reconstruct
2052: # new big and parameter hashes. An implicit assumption at this time
2053: # is that the course file is probably not created locally yet
2054: # an that we will therefore just read without tying.
2055:
2056: my ($cdom, $cnum) = split(/\_/, $env{'request.course.id'});
2057:
2058: my %big_hash;
2059: &Apache::lonmap::loadmap($cnum, $cdom, $self->{USERNAME}, $self->{DOMAIN}, \%big_hash);
2060: $self->{NAV_HASH} = \%big_hash;
2061:
2062:
2063:
2064: # Now clear the parm cache and reconstruct the parm hash fromt he big_hash
2065: # param.xxxx keys.
2066:
2067: $self->{PARM_CACHE} = {};
2068:
2069: my %parm_hash = {};
2070: foreach my $key (keys %big_hash) {
2071: if ($key =~ /^param\./) {
2072: my $param_key = $key;
2073: $param_key =~ s/^param\.//;
2074: $parm_hash{$param_key} = $big_hash{$key};
2075: }
2076: }
2077:
2078: $self->{PARM_HASH} = \%parm_hash;
2079:
2080:
2081:
2082:
2083: }
2084:
2085: sub generate_course_user_opt {
2086: my $self = shift;
2087: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2088:
2089: my $uname=$self->{USERNAME};
2090: my $udom=$self->{DOMAIN};
2091:
2092: my $cid=$env{'request.course.id'};
2093: my $cdom=$env{'course.'.$cid.'.domain'};
2094: my $cnum=$env{'course.'.$cid.'.num'};
2095:
2096: # ------------------------------------------------- Get coursedata (if present)
2097: my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
2098: # Check for network failure
2099: if (!ref($courseopt)) {
2100: if ( $courseopt =~ /no.such.host/i || $courseopt =~ /con_lost/i) {
2101: $self->{NETWORK_FAILURE} = 1;
2102: }
2103: undef($courseopt);
2104: }
2105:
2106: # --------------------------------------------------- Get userdata (if present)
2107:
2108: my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
2109: # Check for network failure
2110: if (!ref($useropt)) {
2111: if ( $useropt =~ /no.such.host/i || $useropt =~ /con_lost/i) {
2112: $self->{NETWORK_FAILURE} = 1;
2113: }
2114: undef($useropt);
2115: }
2116:
2117: $self->{COURSE_OPT} = $courseopt;
2118: $self->{USER_OPT} = $useropt;
2119:
2120: $self->{COURSE_USER_OPT_GENERATED} = 1;
2121:
2122: return;
2123: }
2124:
2125: sub generate_email_discuss_status {
2126: my $self = shift;
2127: my $symb = shift;
2128: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2129:
2130: my $cid=$env{'request.course.id'};
2131: my $cdom=$env{'course.'.$cid.'.domain'};
2132: my $cnum=$env{'course.'.$cid.'.num'};
2133:
2134: my %emailstatus = &Apache::lonnet::dump('email_status',$self->{DOMAIN},$self->{USERNAME});
2135: my $logoutTime = $emailstatus{'logout'};
2136: my $courseLeaveTime = $emailstatus{'logout_'.$env{'request.course.id'}};
2137: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2138: $courseLeaveTime : $logoutTime);
2139: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2140: $cdom, $cnum);
2141: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2142: $self->{DOMAIN},$self->{USERNAME},'lastread');
2143: my %lastreadtime = ();
2144: foreach my $key (keys %lastread) {
2145: my $shortkey = $key;
2146: $shortkey =~ s/_lastread$//;
2147: $lastreadtime{$shortkey} = $lastread{$key};
2148: }
2149:
2150: my %feedback=();
2151: my %error=();
2152: my @keys = &Apache::lonnet::getkeys('nohist_email',$self->{DOMAIN},
2153: $self->{USERNAME});
2154:
2155: foreach my $msgid (@keys) {
2156: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2157: my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
2158: $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
2159: &Apache::lonenc::check_decrypt(\$symb);
2160: if (($fromcid ne '') && ($fromcid ne $cid)) {
2161: next;
2162: }
2163: if (defined($symb)) {
2164: if (defined($error) && $error == 1) {
2165: $error{$symb}.=','.$msgid;
2166: } else {
2167: $feedback{$symb}.=','.$msgid;
2168: }
2169: } else {
2170: my $plain=
2171: &LONCAPA::unescape(&LONCAPA::unescape($msgid));
2172: if ($plain=~/ \[([^\]]+)\]\:/) {
2173: my $url=$1;
2174: if ($plain=~/\:Error \[/) {
2175: $error{$url}.=','.$msgid;
2176: } else {
2177: $feedback{$url}.=','.$msgid;
2178: }
2179: }
2180: }
2181: }
2182: }
2183:
2184: #symbs of resources that have feedbacks (will be urls pre-2.3)
2185: $self->{FEEDBACK} = \%feedback;
2186: #or errors (will be urls pre 2.3)
2187: $self->{ERROR_MSG} = \%error;
2188: $self->{DISCUSSION_TIME} = \%discussiontime;
2189: $self->{EMAIL_STATUS} = \%emailstatus;
2190: $self->{LAST_READ} = \%lastreadtime;
2191:
2192: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2193: }
2194:
2195: sub get_user_data {
2196: my $self = shift;
2197: if ($self->{RETRIEVED_USER_DATA}) { return; }
2198:
2199: # Retrieve performance data on problems
2200: my %student_data = Apache::lonnet::currentdump($env{'request.course.id'},
2201: $self->{DOMAIN},
2202: $self->{USERNAME});
2203: $self->{STUDENT_DATA} = \%student_data;
2204:
2205: $self->{RETRIEVED_USER_DATA} = 1;
2206: }
2207:
2208: sub get_discussion_data {
2209: my $self = shift;
2210: if ($self->{RETRIEVED_DISCUSSION_DATA}) {
2211: return $self->{DISCUSSION_DATA};
2212: }
2213:
2214: $self->generate_email_discuss_status();
2215:
2216: my $cid=$env{'request.course.id'};
2217: my $cdom=$env{'course.'.$cid.'.domain'};
2218: my $cnum=$env{'course.'.$cid.'.num'};
2219: # Retrieve discussion data for resources in course
2220: my %discussion_data = &Apache::lonnet::dumpstore($cid,$cdom,$cnum);
2221:
2222:
2223: $self->{DISCUSSION_DATA} = \%discussion_data;
2224: $self->{RETRIEVED_DISCUSSION_DATA} = 1;
2225: return $self->{DISCUSSION_DATA};
2226: }
2227:
2228:
2229: # Internal function: Takes a key to look up in the nav hash and implements internal
2230: # memory caching of that key.
2231: sub navhash {
2232: my $self = shift; my $key = shift;
2233: return $self->{NAV_HASH}->{$key};
2234: }
2235:
2236: =pod
2237:
2238: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2239: false otherwise. Undefined course maps indicate an error somewhere in
2240: LON-CAPA, and you will not be able to proceed with using the navmap.
2241: See the B<NAV> screen for an example of using this.
2242:
2243: =cut
2244:
2245: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2246: sub courseMapDefined {
2247: my $self = shift;
2248: my $uri = &Apache::lonnet::clutter($env{'request.course.uri'});
2249:
2250: my $firstres = $self->navhash("map_start_$uri");
2251: my $lastres = $self->navhash("map_finish_$uri");
2252: return $firstres && $lastres;
2253: }
2254:
2255: sub getIterator {
2256: my $self = shift;
2257: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2258: shift, undef, shift,
2259: shift, shift);
2260: return $iterator;
2261: }
2262:
2263: # Private method: Does the given resource (as a symb string) have
2264: # current discussion? Returns 0 if chat/mail data not extracted.
2265: sub hasDiscussion {
2266: my $self = shift;
2267: my $symb = shift;
2268: $self->generate_email_discuss_status();
2269:
2270: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2271:
2272: #return defined($self->{DISCUSSION_TIME}->{$symb});
2273:
2274: # backward compatibility (bulletin boards used to be 'wrapped')
2275: my $ressymb = $self->wrap_symb($symb);
2276: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2277: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2278: } else {
2279: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2280: 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).
2281: }
2282: }
2283:
2284: sub last_post_time {
2285: my $self = shift;
2286: my $symb = shift;
2287: my $ressymb = $self->wrap_symb($symb);
2288: return $self->{DISCUSSION_TIME}->{$ressymb};
2289: }
2290:
2291: sub discussion_info {
2292: my $self = shift;
2293: my $symb = shift;
2294: my $filter = shift;
2295:
2296: $self->get_discussion_data();
2297:
2298: my $ressymb = $self->wrap_symb($symb);
2299: # keys used to store bulletinboard postings use 'unwrapped' symb.
2300: my $discsymb = &escape($self->unwrap_symb($ressymb));
2301: my $version = $self->{DISCUSSION_DATA}{'version:'.$discsymb};
2302: if (!$version) { return; }
2303:
2304: my $prevread = $self->{LAST_READ}{$ressymb};
2305:
2306: my $count = 0;
2307: my $hiddenflag = 0;
2308: my $deletedflag = 0;
2309: my ($hidden,$deleted,%info);
2310:
2311: for (my $id=$version; $id>0; $id--) {
2312: my $vkeys=$self->{DISCUSSION_DATA}{$id.':keys:'.$discsymb};
2313: my @keys=split(/:/,$vkeys);
2314: if (grep(/^hidden$/ ,@keys)) {
2315: if (!$hiddenflag) {
2316: $hidden = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':hidden'};
2317: $hiddenflag = 1;
2318: }
2319: } elsif (grep(/^deleted$/,@keys)) {
2320: if (!$deletedflag) {
2321: $deleted = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':deleted'};
2322: $deletedflag = 1;
2323: }
2324: } else {
2325: if (($hidden !~/\.$id\./) && ($deleted !~/\.$id\./)) {
2326: if ($filter eq 'unread') {
2327: if ($prevread >= $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'}) {
2328: next;
2329: }
2330: }
2331: $count++;
2332: $info{$count}{'subject'} =
2333: $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':subject'};
2334: $info{$count}{'id'} = $id;
2335: $info{$count}{'timestamp'} = $self->{DISCUSSION_DATA}{$id.':'.$discsymb.':timestamp'};
2336: }
2337: }
2338: }
2339: if (wantarray) {
2340: return ($count,%info);
2341: }
2342: return $count;
2343: }
2344:
2345: sub wrap_symb {
2346: my $self = shift;
2347: my $symb = shift;
2348: if ($symb =~ m-___(adm/[^/]+/[^/]+/)(\d+)(/bulletinboard)$-) {
2349: unless ($symb =~ m|adm/wrapper/adm|) {
2350: $symb = 'bulletin___'.$2.'___adm/wrapper/'.$1.$2.$3;
2351: }
2352: }
2353: return $symb;
2354: }
2355:
2356: sub unwrap_symb {
2357: my $self = shift;
2358: my $ressymb = shift;
2359: my $discsymb = $ressymb;
2360: if ($ressymb =~ m-^(bulletin___\d+___)adm/wrapper/(adm/[^/]+/[^/]+/\d+/bulletinboard)$-) {
2361: $discsymb = $1.$2;
2362: }
2363: return $discsymb;
2364: }
2365:
2366: # Private method: Does the given resource (as a symb string) have
2367: # current feedback? Returns the string in the feedback hash, which
2368: # will be false if it does not exist.
2369:
2370: sub getFeedback {
2371: my $self = shift;
2372: my $symb = shift;
2373: my $source = shift;
2374:
2375: $self->generate_email_discuss_status();
2376:
2377: if (!defined($self->{FEEDBACK})) { return ""; }
2378:
2379: my $feedback;
2380: if ($self->{FEEDBACK}->{$symb}) {
2381: $feedback = $self->{FEEDBACK}->{$symb};
2382: if ($self->{FEEDBACK}->{$source}) {
2383: $feedback .= ','.$self->{FEEDBACK}->{$source};
2384: }
2385: } else {
2386: if ($self->{FEEDBACK}->{$source}) {
2387: $feedback = $self->{FEEDBACK}->{$source};
2388: }
2389: }
2390: return $feedback;
2391: }
2392:
2393: # Private method: Get the errors for that resource (by source).
2394: sub getErrors {
2395: my $self = shift;
2396: my $symb = shift;
2397: my $src = shift;
2398:
2399: $self->generate_email_discuss_status();
2400:
2401: if (!defined($self->{ERROR_MSG})) { return ""; }
2402:
2403: my $errors;
2404: if ($self->{ERROR_MSG}->{$symb}) {
2405: $errors = $self->{ERROR_MSG}->{$symb};
2406: if ($self->{ERROR_MSG}->{$src}) {
2407: $errors .= ','.$self->{ERROR_MSG}->{$src};
2408: }
2409: } else {
2410: if ($self->{ERROR_MSG}->{$src}) {
2411: $errors = $self->{ERROR_MSG}->{$src};
2412: }
2413: }
2414: return $errors;
2415: }
2416:
2417: =pod
2418:
2419: =item * B<getById>(id):
2420:
2421: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2422: object for that resource. This method, or other methods that use it
2423: (as in the resource object) is the only proper way to obtain a
2424: resource object.
2425:
2426: =item * B<getBySymb>(symb):
2427:
2428: Based on the symb of the resource, get a resource object for that
2429: resource. This is one of the proper ways to get a resource object.
2430:
2431: =item * B<getByMapPc>(map_pc):
2432:
2433: Based on the map_pc of the resource, get a resource object for
2434: the given map. This is one of the proper ways to get a resource object.
2435:
2436: =cut
2437:
2438: # The strategy here is to cache the resource objects, and only construct them
2439: # as we use them. The real point is to prevent reading any more from the tied
2440: # hash than we have to, which should hopefully alleviate speed problems.
2441:
2442: sub getById {
2443: my $self = shift;
2444: my $id = shift;
2445:
2446: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2447: {
2448: return $self->{RESOURCE_CACHE}->{$id};
2449: }
2450:
2451: # resource handles inserting itself into cache.
2452: # Not clear why the quotes are necessary, but as of this
2453: # writing it doesn't work without them.
2454: return "Apache::lonnavmaps::resource"->new($self, $id);
2455: }
2456:
2457: sub getBySymb {
2458: my $self = shift;
2459: my $symb = shift;
2460:
2461: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2462: my $map = $self->getResourceByUrl($mapUrl);
2463: my $returnvalue = undef;
2464: if (ref($map)) {
2465: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2466: }
2467: return $returnvalue;
2468: }
2469:
2470: sub getByMapPc {
2471: my $self = shift;
2472: my $map_pc = shift;
2473: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2474: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2475: return $self->getById($map_id);
2476: }
2477:
2478: =pod
2479:
2480: =item * B<firstResource>():
2481:
2482: Returns a resource object reference corresponding to the first
2483: resource in the navmap.
2484:
2485: =cut
2486:
2487: sub firstResource {
2488: my $self = shift;
2489: my $firstResource = $self->navhash('map_start_' .
2490: &Apache::lonnet::clutter($env{'request.course.uri'}));
2491: return $self->getById($firstResource);
2492: }
2493:
2494: =pod
2495:
2496: =item * B<finishResource>():
2497:
2498: Returns a resource object reference corresponding to the last resource
2499: in the navmap.
2500:
2501: =cut
2502:
2503: sub finishResource {
2504: my $self = shift;
2505: my $firstResource = $self->navhash('map_finish_' .
2506: &Apache::lonnet::clutter($env{'request.course.uri'}));
2507: return $self->getById($firstResource);
2508: }
2509:
2510: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2511: # the actual lookup; parmval caches the results.
2512: sub parmval {
2513: my $self = shift;
2514: my ($what,$symb,$recurse)=@_;
2515: my $hashkey = $what."|||".$symb;
2516: my $cache = $self->{PARM_CACHE};
2517: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2518: if (ref($self->{PARM_CACHE}->{$hashkey}) eq 'ARRAY') {
2519: if (defined($self->{PARM_CACHE}->{$hashkey}->[0])) {
2520: if (wantarray) {
2521: return @{$self->{PARM_CACHE}->{$hashkey}};
2522: } else {
2523: return $self->{PARM_CACHE}->{$hashkey}->[0];
2524: }
2525: }
2526: } else {
2527: return $self->{PARM_CACHE}->{$hashkey};
2528: }
2529: }
2530: my $result = $self->parmval_real($what, $symb, $recurse);
2531: $self->{PARM_CACHE}->{$hashkey} = $result;
2532: if (wantarray) {
2533: return @{$result};
2534: }
2535: return $result->[0];
2536: }
2537:
2538: sub parmval_real {
2539: my $self = shift;
2540: my ($what,$symb,$recurse) = @_;
2541:
2542: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2543: $self->generate_course_user_opt();
2544:
2545: my $cid=$env{'request.course.id'};
2546: my $csec=$env{'request.course.sec'};
2547: my $cgroup='';
2548: my @cgrps=split(/:/,$env{'request.course.groups'});
2549: if (@cgrps > 0) {
2550: @cgrps = sort(@cgrps);
2551: $cgroup = $cgrps[0];
2552: }
2553: my $uname=$self->{USERNAME};
2554: my $udom=$self->{DOMAIN};
2555:
2556: unless ($symb) { return ['']; }
2557: my $result='';
2558:
2559: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2560: $mapname = &Apache::lonnet::deversion($mapname);
2561: # ----------------------------------------------------- Cascading lookup scheme
2562: my $rwhat=$what;
2563: $what=~s/^parameter\_//;
2564: $what=~s/\_/\./;
2565:
2566: my $symbparm=$symb.'.'.$what;
2567: my $mapparm=$mapname.'___(all).'.$what;
2568: my $usercourseprefix=$cid;
2569:
2570: my $grplevel=$usercourseprefix.'.['.$cgroup.'].'.$what;
2571: my $grplevelr=$usercourseprefix.'.['.$cgroup.'].'.$symbparm;
2572: my $grplevelm=$usercourseprefix.'.['.$cgroup.'].'.$mapparm;
2573:
2574: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2575: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2576: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2577:
2578: my $courselevel= $usercourseprefix.'.'.$what;
2579: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2580: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2581:
2582: my $useropt = $self->{USER_OPT};
2583: my $courseopt = $self->{COURSE_OPT};
2584: my $parmhash = $self->{PARM_HASH};
2585:
2586: # ---------------------------------------------------------- first, check user
2587: if ($uname and defined($useropt)) {
2588: if (defined($$useropt{$courselevelr})) { return [$$useropt{$courselevelr},'resource']; }
2589: if (defined($$useropt{$courselevelm})) { return [$$useropt{$courselevelm},'map']; }
2590: if (defined($$useropt{$courselevel})) { return [$$useropt{$courselevel},'course']; }
2591: }
2592:
2593: # ------------------------------------------------------- second, check course
2594: if ($cgroup ne '' and defined($courseopt)) {
2595: if (defined($$courseopt{$grplevelr})) { return [$$courseopt{$grplevelr},'resource']; }
2596: if (defined($$courseopt{$grplevelm})) { return [$$courseopt{$grplevelm},'map']; }
2597: if (defined($$courseopt{$grplevel})) { return [$$courseopt{$grplevel},'course']; }
2598: }
2599:
2600: if ($csec and defined($courseopt)) {
2601: if (defined($$courseopt{$seclevelr})) { return [$$courseopt{$seclevelr},'resource']; }
2602: if (defined($$courseopt{$seclevelm})) { return [$$courseopt{$seclevelm},'map']; }
2603: if (defined($$courseopt{$seclevel})) { return [$$courseopt{$seclevel},'course']; }
2604: }
2605:
2606: if (defined($courseopt)) {
2607: if (defined($$courseopt{$courselevelr})) { return [$$courseopt{$courselevelr},'resource']; }
2608: }
2609:
2610: # ----------------------------------------------------- third, check map parms
2611:
2612: my $thisparm=$$parmhash{$symbparm};
2613: if (defined($thisparm)) { return [$thisparm,'map']; }
2614:
2615: # ----------------------------------------------------- fourth , check default
2616:
2617: my $meta_rwhat=$rwhat;
2618: $meta_rwhat=~s/\./_/g;
2619: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2620: if (defined($default)) { return [$default,'resource']}
2621: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2622: if (defined($default)) { return [$default,'resource']}
2623: # --------------------------------------------------- fifth, check more course
2624: if (defined($courseopt)) {
2625: if (defined($$courseopt{$courselevelm})) { return [$$courseopt{$courselevelm},'map']; }
2626: if (defined($$courseopt{$courselevel})) {
2627: my $ret = [$$courseopt{$courselevel},'course'];
2628: return $ret;
2629: }
2630: }
2631: # --------------------------------------------------- sixth , cascade up parts
2632:
2633: my ($space,@qualifier)=split(/\./,$rwhat);
2634: my $qualifier=join('.',@qualifier);
2635: unless ($space eq '0') {
2636: my @parts=split(/_/,$space);
2637: my $id=pop(@parts);
2638: my $part=join('_',@parts);
2639: if ($part eq '') { $part='0'; }
2640: my @partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2641: if (defined($partgeneral[0])) { return \@partgeneral; }
2642: }
2643: if ($recurse) { return []; }
2644: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$rwhat);
2645: if (defined($pack_def)) { return [$pack_def,'resource']; }
2646: return [''];
2647: }
2648:
2649: =pod
2650:
2651: =item * B<getResourceByUrl>(url,multiple):
2652:
2653: Retrieves a resource object by URL of the resource, unless the optional
2654: multiple parameter is included in which case an array of resource
2655: objects is returned. If passed a resource object, it will simply return
2656: it, so it is safe to use this method in code like
2657: "$res = $navmap->getResourceByUrl($res)"
2658: if you're not sure if $res is already an object, or just a URL. If the
2659: resource appears multiple times in the course, only the first instance
2660: will be returned (useful for maps), unless the multiple parameter has
2661: been included, in which case all instances are returned in an array.
2662:
2663: =item * B<retrieveResources>(map, filterFunc, recursive, bailout, showall):
2664:
2665: The map is a specification of a map to retreive the resources from,
2666: either as a url or as an object. The filterFunc is a reference to a
2667: function that takes a resource object as its one argument and returns
2668: true if the resource should be included, or false if it should not
2669: be. If recursive is true, the map will be recursively examined,
2670: otherwise it will not be. If bailout is true, the function will return
2671: as soon as it finds a resource, if false it will finish. If showall is
2672: true it will not hide maps that contain nothing but one other map. By
2673: default, the map is the top-level map of the course, filterFunc is a
2674: function that always returns 1, recursive is true, bailout is false,
2675: showall is false. The resources will be returned in a list containing
2676: the resource objects for the corresponding resources, with B<no
2677: structure information> in the list; regardless of branching,
2678: recursion, etc., it will be a flat list.
2679:
2680: Thus, this is suitable for cases where you don't want the structure,
2681: just a list of all resources. It is also suitable for finding out how
2682: many resources match a given description; for this use, if all you
2683: want to know is if I<any> resources match the description, the bailout
2684: parameter will allow you to avoid potentially expensive enumeration of
2685: all matching resources.
2686:
2687: =item * B<hasResource>(map, filterFunc, recursive, showall):
2688:
2689: Convenience method for
2690:
2691: scalar(retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0
2692:
2693: which will tell whether the map has resources matching the description
2694: in the filter function.
2695:
2696: =item * B<usedVersion>(url):
2697:
2698: Retrieves version infomation for a url. Returns the version (a number, or
2699: the string "mostrecent") for resources which have version information in
2700: the big hash.
2701:
2702: =cut
2703:
2704:
2705: sub getResourceByUrl {
2706: my $self = shift;
2707: my $resUrl = shift;
2708: my $multiple = shift;
2709:
2710: if (ref($resUrl)) { return $resUrl; }
2711:
2712: $resUrl = &Apache::lonnet::clutter($resUrl);
2713: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2714: if (!$resId) { return ''; }
2715: if ($multiple) {
2716: my @resources = ();
2717: my @resIds = split (/,/, $resId);
2718: foreach my $id (@resIds) {
2719: my $resourceId = $self->getById($id);
2720: if ($resourceId) {
2721: push(@resources,$resourceId);
2722: }
2723: }
2724: return @resources;
2725: } else {
2726: if ($resId =~ /,/) {
2727: $resId = (split (/,/, $resId))[0];
2728: }
2729: return $self->getById($resId);
2730: }
2731: }
2732:
2733: sub retrieveResources {
2734: my $self = shift;
2735: my $map = shift;
2736: my $filterFunc = shift;
2737: if (!defined ($filterFunc)) {
2738: $filterFunc = sub {return 1;};
2739: }
2740: my $recursive = shift;
2741: if (!defined($recursive)) { $recursive = 1; }
2742: my $bailout = shift;
2743: if (!defined($bailout)) { $bailout = 0; }
2744: my $showall = shift;
2745: # Create the necessary iterator.
2746: if (!ref($map)) { # assume it's a url of a map.
2747: $map = $self->getResourceByUrl($map);
2748: }
2749:
2750: # If nothing was passed, assume top-level map
2751: if (!$map) {
2752: $map = $self->getById('0.0');
2753: }
2754:
2755: # Check the map's validity.
2756: if (!$map->is_map()) {
2757: # Oh, to throw an exception.... how I'd love that!
2758: return ();
2759: }
2760:
2761: # Get an iterator.
2762: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2763: undef, $recursive, $showall);
2764:
2765: my @resources = ();
2766:
2767: if (&$filterFunc($map)) {
2768: push(@resources, $map);
2769: }
2770:
2771: # Run down the iterator and collect the resources.
2772: my $curRes;
2773:
2774: while ($curRes = $it->next()) {
2775: if (ref($curRes)) {
2776: if (!&$filterFunc($curRes)) {
2777: next;
2778: }
2779:
2780: push(@resources, $curRes);
2781:
2782: if ($bailout) {
2783: return @resources;
2784: }
2785: }
2786:
2787: }
2788:
2789: return @resources;
2790: }
2791:
2792: sub hasResource {
2793: my $self = shift;
2794: my $map = shift;
2795: my $filterFunc = shift;
2796: my $recursive = shift;
2797: my $showall = shift;
2798:
2799: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1, $showall)) > 0;
2800: }
2801:
2802: sub usedVersion {
2803: my $self = shift;
2804: my $linkurl = shift;
2805: return $self->navhash("version_$linkurl");
2806: }
2807:
2808: 1;
2809:
2810: package Apache::lonnavmaps::iterator;
2811: use Scalar::Util qw(weaken);
2812: use Apache::lonnet;
2813:
2814: =pod
2815:
2816: =back
2817:
2818: =head1 Object: navmap Iterator
2819:
2820: An I<iterator> encapsulates the logic required to traverse a data
2821: structure. navmap uses an iterator to traverse the course map
2822: according to the criteria you wish to use.
2823:
2824: To obtain an iterator, call the B<getIterator>() function of a
2825: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2826: directly.) This will return a reference to the iterator:
2827:
2828: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2829:
2830: To get the next thing from the iterator, call B<next>:
2831:
2832: C<my $nextThing = $resourceIterator-E<gt>next()>
2833:
2834: getIterator behaves as follows:
2835:
2836: =over 4
2837:
2838: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2839:
2840: All parameters are optional. firstResource is a resource reference
2841: corresponding to where the iterator should start. It defaults to
2842: navmap->firstResource() for the corresponding nav map. finishResource
2843: corresponds to where you want the iterator to end, defaulting to
2844: navmap->finishResource(). filterHash is a hash used as a set
2845: containing strings representing the resource IDs, defaulting to
2846: empty. Condition is a 1 or 0 that sets what to do with the filter
2847: hash: If a 0, then only resources that exist IN the filterHash will be
2848: recursed on. If it is a 1, only resources NOT in the filterHash will
2849: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2850: false (default), the iterator will only return the first level of map
2851: that is not just a single, 'redirecting' map. If true, the iterator
2852: will return all information, starting with the top-level map,
2853: regardless of content. returnTopMap, if true (default false), will
2854: cause the iterator to return the top-level map object (resource 0.0)
2855: before anything else.
2856:
2857: Thus, by default, only top-level resources will be shown. Change the
2858: condition to a 1 without changing the hash, and all resources will be
2859: shown. Changing the condition to 1 and including some values in the
2860: hash will allow you to selectively suppress parts of the navmap, while
2861: leaving it on 0 and adding things to the hash will allow you to
2862: selectively add parts of the nav map. See the handler code for
2863: examples.
2864:
2865: The iterator will return either a reference to a resource object, or a
2866: token representing something in the map, such as the beginning of a
2867: new branch. The possible tokens are:
2868:
2869: =over 4
2870:
2871: =item * B<END_ITERATOR>:
2872:
2873: The iterator has returned all that it's going to. Further calls to the
2874: iterator will just produce more of these. This is a "false" value, and
2875: is the only false value the iterator which will be returned, so it can
2876: be used as a loop sentinel.
2877:
2878: =item * B<BEGIN_MAP>:
2879:
2880: A new map is being recursed into. This is returned I<after> the map
2881: resource itself is returned.
2882:
2883: =item * B<END_MAP>:
2884:
2885: The map is now done.
2886:
2887: =item * B<BEGIN_BRANCH>:
2888:
2889: A branch is now starting. The next resource returned will be the first
2890: in that branch.
2891:
2892: =item * B<END_BRANCH>:
2893:
2894: The branch is now done.
2895:
2896: =back
2897:
2898: The tokens are retreivable via methods on the iterator object, i.e.,
2899: $iterator->END_MAP.
2900:
2901: Maps can contain empty resources. The iterator will automatically skip
2902: over such resources, but will still treat the structure
2903: correctly. Thus, a complicated map with several branches, but
2904: consisting entirely of empty resources except for one beginning or
2905: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2906: but only one resource will be returned.
2907:
2908: =back
2909:
2910: =head2 Normal Usage
2911:
2912: Normal usage of the iterator object is to do the following:
2913:
2914: my $it = $navmap->getIterator([your params here]);
2915: my $curRes;
2916: while ($curRes = $it->next()) {
2917: [your logic here]
2918: }
2919:
2920: Note that inside of the loop, it's frequently useful to check if
2921: "$curRes" is a reference or not with the reference function; only
2922: resource objects will be references, and any non-references will
2923: be the tokens described above.
2924:
2925: Also note there is some old code floating around that trys to track
2926: the depth of the iterator to see when it's done; do not copy that
2927: code. It is difficult to get right and harder to understand than
2928: this. They should be migrated to this new style.
2929:
2930: =cut
2931:
2932: # Here are the tokens for the iterator:
2933:
2934: sub END_ITERATOR { return 0; }
2935: sub BEGIN_MAP { return 1; } # begining of a new map
2936: sub END_MAP { return 2; } # end of the map
2937: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2938: sub END_BRANCH { return 4; } # end of a branch
2939: sub FORWARD { return 1; } # go forward
2940: sub BACKWARD { return 2; }
2941:
2942: sub min {
2943: (my $a, my $b) = @_;
2944: if ($a < $b) { return $a; } else { return $b; }
2945: }
2946:
2947: sub new {
2948: # magic invocation to create a class instance
2949: my $proto = shift;
2950: my $class = ref($proto) || $proto;
2951: my $self = {};
2952:
2953: weaken($self->{NAV_MAP} = shift);
2954: return undef unless ($self->{NAV_MAP});
2955:
2956: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
2957: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
2958:
2959: # Handle the parameters
2960: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2961: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2962:
2963: # If the given resources are just the ID of the resource, get the
2964: # objects
2965: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2966: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2967: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2968: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2969:
2970: $self->{FILTER} = shift;
2971:
2972: # A hash, used as a set, of resource already seen
2973: $self->{ALREADY_SEEN} = shift;
2974: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2975: $self->{CONDITION} = shift;
2976:
2977: # Do we want to automatically follow "redirection" maps?
2978: $self->{FORCE_TOP} = shift;
2979:
2980: # Do we want to return the top-level map object (resource 0.0)?
2981: $self->{RETURN_0} = shift;
2982: # have we done that yet?
2983: $self->{HAVE_RETURNED_0} = 0;
2984:
2985: # Now, we need to pre-process the map, by walking forward and backward
2986: # over the parts of the map we're going to look at.
2987:
2988: # The processing steps are exactly the same, except for a few small
2989: # changes, so I bundle those up in the following list of two elements:
2990: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2991: # first_resource).
2992: # This prevents writing nearly-identical code twice.
2993: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2994: 'FIRST_RESOURCE'],
2995: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2996: 'FINISH_RESOURCE'] );
2997:
2998: my $maxDepth = 0; # tracks max depth
2999:
3000: # If there is only one resource in this map, and it's a map, we
3001: # want to remember that, so the user can ask for the first map
3002: # that isn't just a redirector.
3003: my $resource; my $resourceCount = 0;
3004:
3005: # Documentation on this algorithm can be found in the CVS repository at
3006: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
3007: # in that file.
3008: # **1**
3009:
3010: foreach my $pass (@iterations) {
3011: my $direction = $pass->[0];
3012: my $valName = $pass->[1];
3013: my $nextResourceMethod = $pass->[2];
3014: my $firstResourceName = $pass->[3];
3015:
3016: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
3017: $self->{FIRST_RESOURCE},
3018: $self->{FINISH_RESOURCE},
3019: {}, undef, 0, $direction);
3020:
3021: # prime the recursion
3022: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
3023: $iterator->next();
3024: my $curRes = $iterator->next();
3025: my $depth = 1;
3026: while ($depth > 0) {
3027: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
3028: if ($curRes == $iterator->END_MAP()) { $depth--; }
3029:
3030: if (ref($curRes)) {
3031: # If there's only one resource, this will save it
3032: # we have to filter empty resources from consideration here,
3033: # or even "empty", redirecting maps have two (start & finish)
3034: # or three (start, finish, plus redirector)
3035: if($direction == FORWARD && $curRes->src()) {
3036: $resource = $curRes; $resourceCount++;
3037: }
3038: my $resultingVal = $curRes->{DATA}->{$valName};
3039: my $nextResources = $curRes->$nextResourceMethod();
3040: my $nextCount = scalar(@{$nextResources});
3041:
3042: if ($nextCount == 1) { # **3**
3043: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
3044: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
3045: }
3046:
3047: if ($nextCount > 1) { # **4**
3048: foreach my $res (@{$nextResources}) {
3049: my $current = $res->{DATA}->{$valName} || 999999999;
3050: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
3051: }
3052: }
3053: }
3054:
3055: # Assign the final val (**2**)
3056: if (ref($curRes) && $direction == BACKWARD()) {
3057: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
3058: $curRes->{DATA}->{BOT_UP_VAL});
3059:
3060: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
3061: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
3062: }
3063:
3064: $curRes = $iterator->next();
3065: }
3066: }
3067:
3068: # Check: Was this only one resource, a map?
3069: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
3070: my $firstResource = $resource->map_start();
3071: my $finishResource = $resource->map_finish();
3072: my $result;
3073: my $rdump = Data::Dumper->new([$result]);
3074: $result = Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3075: $finishResource, $self->{FILTER},
3076: $self->{ALREADY_SEEN},
3077: $self->{CONDITION},
3078: $self->{FORCE_TOP});
3079: return $result;
3080:
3081:
3082: }
3083:
3084: # Set up some bookkeeping information.
3085: $self->{CURRENT_DEPTH} = 0;
3086: $self->{MAX_DEPTH} = $maxDepth;
3087: $self->{STACK} = [];
3088: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3089: $self->{FINISHED} = 0; # When true, the iterator has finished
3090:
3091: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
3092: push @{$self->{STACK}}, [];
3093: }
3094:
3095: # Prime the recursion w/ the first resource **5**
3096: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
3097: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
3098:
3099: bless ($self);
3100: my $selfDump = Data::Dumper->new([$self]);
3101:
3102: return $self;
3103: }
3104:
3105: sub next {
3106: my $self = shift;
3107: my $closeAllPages=shift;
3108: if ($self->{FINISHED}) {
3109: return END_ITERATOR();
3110: }
3111:
3112: # If we want to return the top-level map object, and haven't yet,
3113: # do so.
3114: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
3115: $self->{HAVE_RETURNED_0} = 1;
3116: my $nextTopLevel = $self->{NAV_MAP}->getById('0.0');
3117:
3118: return $self->{NAV_MAP}->getById('0.0');
3119: }
3120: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0_BEGIN_MAP}) {
3121: $self->{HAVE_RETURNED_0_BEGIN_MAP} = 1;
3122: return $self->BEGIN_MAP();
3123: }
3124:
3125: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3126: # grab the next from the recursive iterator
3127: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
3128:
3129: # is it a begin or end map? If so, update the depth
3130: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3131: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3132:
3133: # Are we back at depth 0? If so, stop recursing
3134: if ($self->{RECURSIVE_DEPTH} == 0) {
3135: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3136: }
3137: return $next;
3138: }
3139:
3140: if (defined($self->{FORCE_NEXT})) {
3141: my $tmp = $self->{FORCE_NEXT};
3142: $self->{FORCE_NEXT} = undef;
3143:
3144: return $tmp;
3145: }
3146:
3147: # Have we not yet begun? If not, return BEGIN_MAP and
3148: # remember we've started.
3149: if ( !$self->{STARTED} ) {
3150: $self->{STARTED} = 1;
3151: return $self->BEGIN_MAP();
3152: }
3153:
3154: # Here's the guts of the iterator.
3155:
3156: # Find the next resource, if any.
3157: my $found = 0;
3158: my $i = $self->{MAX_DEPTH};
3159: my $newDepth;
3160: my $here;
3161: while ( $i >= 0 && !$found ) {
3162: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
3163: $here = pop @{$self->{STACK}->[$i]}; # **7**
3164: $found = 1;
3165: $newDepth = $i;
3166: }
3167: $i--;
3168: }
3169:
3170: # If we still didn't find anything, we're done.
3171: if ( !$found ) {
3172: # We need to get back down to the correct branch depth
3173: if ( $self->{CURRENT_DEPTH} > 0 ) {
3174: $self->{CURRENT_DEPTH}--;
3175: return END_BRANCH();
3176: } else {
3177: $self->{FINISHED} = 1;
3178: return END_MAP();
3179: }
3180: }
3181:
3182: # If this is not a resource, it must be an END_BRANCH marker we want
3183: # to return directly.
3184: if (!ref($here)) { # **8**
3185: if ($here == END_BRANCH()) { # paranoia, in case of later extension
3186: $self->{CURRENT_DEPTH}--;
3187: return $here;
3188: }
3189: }
3190:
3191: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
3192: $self->{HERE} = $here;
3193:
3194: # Get to the right level
3195: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
3196: push @{$self->{STACK}->[$newDepth]}, $here;
3197: $self->{CURRENT_DEPTH}--;
3198: return END_BRANCH();
3199: }
3200: if ( $self->{CURRENT_DEPTH} < $newDepth) {
3201: push @{$self->{STACK}->[$newDepth]}, $here;
3202: $self->{CURRENT_DEPTH}++;
3203: return BEGIN_BRANCH();
3204: }
3205:
3206: # If we made it here, we have the next resource, and we're at the
3207: # right branch level. So let's examine the resource for where
3208: # we can get to from here.
3209:
3210: # So we need to look at all the resources we can get to from here,
3211: # categorize them if we haven't seen them, remember if we have a new
3212: my $nextUnfiltered = $here->getNext();
3213:
3214:
3215: my $maxDepthAdded = -1;
3216:
3217: for (@$nextUnfiltered) {
3218: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3219: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3220: push @{$self->{STACK}->[$depth]}, $_;
3221: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3222: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3223: }
3224: }
3225:
3226: # Is this the end of a branch? If so, all of the resources examined above
3227: # led to lower levels than the one we are currently at, so we push a END_BRANCH
3228: # marker onto the stack so we don't forget.
3229: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3230: # BC branch and gets to C, it will see F as the only next resource, but it's
3231: # one level lower. Thus, this is the end of the branch, since there are no
3232: # more resources added to this level or above.
3233: # We don't do this if the examined resource is the finish resource,
3234: # because the condition given above is true, but the "END_MAP" will
3235: # take care of things and we should already be at depth 0.
3236: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3237: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3238: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3239: }
3240:
3241: # That ends the main iterator logic. Now, do we want to recurse
3242: # down this map (if this resource is a map)?
3243: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3244: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3245: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3246: my $firstResource = $self->{HERE}->map_start();
3247: my $finishResource = $self->{HERE}->map_finish();
3248: $self->{RECURSIVE_ITERATOR} =
3249: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3250: $finishResource, $self->{FILTER},
3251: $self->{ALREADY_SEEN},
3252: $self->{CONDITION},
3253: $self->{FORCE_TOP});
3254: }
3255:
3256: # If this is a blank resource, don't actually return it.
3257: # Should you ever find you need it, make sure to add an option to the code
3258: # that you can use; other things depend on this behavior.
3259: my $browsePriv = $self->{HERE}->browsePriv();
3260: if (!$self->{HERE}->src() ||
3261: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3262: return $self->next($closeAllPages);
3263: }
3264:
3265: my $hereResource = $self->{HERE};
3266:
3267: return $self->{HERE};
3268:
3269: }
3270:
3271: =pod
3272:
3273: The other method available on the iterator is B<getStack>, which
3274: returns an array populated with the current 'stack' of maps, as
3275: references to the resource objects. Example: This is useful when
3276: making the navigation map, as we need to check whether we are under a
3277: page map to see if we need to link directly to the resource, or to the
3278: page. The first elements in the array will correspond to the top of
3279: the stack (most inclusive map).
3280:
3281: =cut
3282:
3283: sub getStack {
3284: my $self=shift;
3285:
3286: my @stack;
3287:
3288: $self->populateStack(\@stack);
3289:
3290: return \@stack;
3291: }
3292:
3293: # Private method: Calls the iterators recursively to populate the stack.
3294: sub populateStack {
3295: my $self=shift;
3296: my $stack = shift;
3297:
3298: push @$stack, $self->{HERE} if ($self->{HERE});
3299:
3300: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3301: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3302: }
3303: }
3304:
3305: 1;
3306:
3307: package Apache::lonnavmaps::DFSiterator;
3308: use Scalar::Util qw(weaken);
3309: use Apache::lonnet;
3310:
3311: # Not documented in the perldoc: This is a simple iterator that just walks
3312: # through the nav map and presents the resources in a depth-first search
3313: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3314: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3315: # useful for pre-processing of some kind, and is in fact used by the main
3316: # iterator that way, but that's about it.
3317: # One could imagine merging this into the init routine of the main iterator,
3318: # but this might as well be left separate, since it is possible some other
3319: # use might be found for it. - Jeremy
3320:
3321: # Unlike the main iterator, this DOES return all resources, even blank ones.
3322: # The main iterator needs them to correctly preprocess the map.
3323:
3324: sub BEGIN_MAP { return 1; } # begining of a new map
3325: sub END_MAP { return 2; } # end of the map
3326: sub FORWARD { return 1; } # go forward
3327: sub BACKWARD { return 2; }
3328:
3329: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3330: # filter hash ref (or undef), already seen hash or undef, condition
3331: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3332: sub new {
3333: # magic invocation to create a class instance
3334: my $proto = shift;
3335: my $class = ref($proto) || $proto;
3336: my $self = {};
3337:
3338: weaken($self->{NAV_MAP} = shift);
3339: return undef unless ($self->{NAV_MAP});
3340:
3341: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3342: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3343:
3344: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3345: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3346:
3347: # If the given resources are just the ID of the resource, get the
3348: # objects
3349: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3350: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3351: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3352: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3353:
3354: $self->{FILTER} = shift;
3355:
3356: # A hash, used as a set, of resource already seen
3357: $self->{ALREADY_SEEN} = shift;
3358: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3359: $self->{CONDITION} = shift;
3360: $self->{DIRECTION} = shift || FORWARD();
3361:
3362: # Flag: Have we started yet?
3363: $self->{STARTED} = 0;
3364:
3365: # Should we continue calling the recursive iterator, if any?
3366: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3367: # The recursive iterator, if any
3368: $self->{RECURSIVE_ITERATOR} = undef;
3369: # Are we recursing on a map, or a branch?
3370: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3371: # And the count of how deep it is, so that this iterator can keep track of
3372: # when to pick back up again.
3373: $self->{RECURSIVE_DEPTH} = 0;
3374:
3375: # For keeping track of our branches, we maintain our own stack
3376: $self->{STACK} = [];
3377:
3378: # Start with the first resource
3379: if ($self->{DIRECTION} == FORWARD) {
3380: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3381: } else {
3382: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3383: }
3384:
3385: bless($self);
3386: return $self;
3387: }
3388:
3389: sub next {
3390: my $self = shift;
3391:
3392: # Are we using a recursive iterator? If so, pull from that and
3393: # watch the depth; we want to resume our level at the correct time.
3394: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3395: # grab the next from the recursive iterator
3396: my $next = $self->{RECURSIVE_ITERATOR}->next();
3397:
3398: # is it a begin or end map? Update depth if so
3399: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3400: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3401:
3402: # Are we back at depth 0? If so, stop recursing.
3403: if ($self->{RECURSIVE_DEPTH} == 0) {
3404: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3405: }
3406:
3407: return $next;
3408: }
3409:
3410: # Is there a current resource to grab? If not, then return
3411: # END_MAP, which will end the iterator.
3412: if (scalar(@{$self->{STACK}}) == 0) {
3413: return $self->END_MAP();
3414: }
3415:
3416: # Have we not yet begun? If not, return BEGIN_MAP and
3417: # remember that we've started.
3418: if ( !$self->{STARTED} ) {
3419: $self->{STARTED} = 1;
3420: return $self->BEGIN_MAP;
3421: }
3422:
3423: # Get the next resource in the branch
3424: $self->{HERE} = pop @{$self->{STACK}};
3425:
3426: # remember that we've seen this, so we don't return it again later
3427: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3428:
3429: # Get the next possible resources
3430: my $nextUnfiltered;
3431: if ($self->{DIRECTION} == FORWARD()) {
3432: $nextUnfiltered = $self->{HERE}->getNext();
3433:
3434: } else {
3435: $nextUnfiltered = $self->{HERE}->getPrevious();
3436: }
3437: my $next = [];
3438:
3439: # filter the next possibilities to remove things we've
3440: # already seen.
3441: foreach my $item (@$nextUnfiltered) {
3442: if (!defined($self->{ALREADY_SEEN}->{$item->{ID}})) {
3443: push @$next, $item;
3444: }
3445: }
3446:
3447: while (@$next) {
3448: # copy the next possibilities over to the stack
3449: push @{$self->{STACK}}, shift @$next;
3450: }
3451:
3452: # If this is a map and we want to recurse down it... (not filtered out)
3453: if ($self->{HERE}->is_map() &&
3454: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3455: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3456: my $firstResource = $self->{HERE}->map_start();
3457: my $finishResource = $self->{HERE}->map_finish();
3458:
3459: $self->{RECURSIVE_ITERATOR} =
3460: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3461: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3462: $self->{CONDITION}, $self->{DIRECTION});
3463: }
3464:
3465: return $self->{HERE};
3466: }
3467:
3468: # Identical to the full iterator methods of the same name. Hate to copy/paste
3469: # but I also hate to "inherit" either iterator from the other.
3470:
3471: sub getStack {
3472: my $self=shift;
3473:
3474: my @stack;
3475:
3476: $self->populateStack(\@stack);
3477:
3478: return \@stack;
3479: }
3480:
3481: # Private method: Calls the iterators recursively to populate the stack.
3482: sub populateStack {
3483: my $self=shift;
3484: my $stack = shift;
3485:
3486: push @$stack, $self->{HERE} if ($self->{HERE});
3487:
3488: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3489: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3490: }
3491: }
3492:
3493: 1;
3494:
3495: package Apache::lonnavmaps::resource;
3496: use Scalar::Util qw(weaken);
3497: use Apache::lonnet;
3498:
3499: =pod
3500:
3501: =head1 Object: resource
3502:
3503: X<resource, navmap object>
3504: A resource object encapsulates a resource in a resource map, allowing
3505: easy manipulation of the resource, querying the properties of the
3506: resource (including user properties), and represents a reference that
3507: can be used as the canonical representation of the resource by
3508: lonnavmap clients like renderers.
3509:
3510: A resource only makes sense in the context of a navmap, as some of the
3511: data is stored in the navmap object.
3512:
3513: You will probably never need to instantiate this object directly. Use
3514: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3515: starting resource.
3516:
3517: Resource objects respect the parameter_hiddenparts, which suppresses
3518: various parts according to the wishes of the map author. As of this
3519: writing, there is no way to override this parameter, and suppressed
3520: parts will never be returned, nor will their response types or ids be
3521: stored.
3522:
3523: =head2 Overview
3524:
3525: A B<Resource> is the most granular type of object in LON-CAPA that can
3526: be included in a course. It can either be a particular resource, like
3527: an HTML page, external resource, problem, etc., or it can be a
3528: container sequence, such as a "page" or a "map".
3529:
3530: To see a sequence from the user's point of view, please see the
3531: B<Creating a Course: Maps and Sequences> chapter of the Author's
3532: Manual.
3533:
3534: A Resource Object, once obtained from a navmap object via a B<getBy*>
3535: method of the navmap, or from an iterator, allows you to query
3536: information about that resource.
3537:
3538: Generally, you do not ever want to create a resource object yourself,
3539: so creation has been left undocumented. Always retrieve resources
3540: from navmap objects.
3541:
3542: =head3 Identifying Resources
3543:
3544: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3545: unique to that resource for a given course. X<resource ID, in big hash>
3546: The Resource ID has the form #.#, where the first number is the same
3547: for every resource in a map, and the second is unique. For instance,
3548: for a course laid out like this:
3549:
3550: * Problem 1
3551: * Map
3552: * Resource 2
3553: * Resource 3
3554:
3555: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3556: C<Resource 3> will share a first number. The second number may end up
3557: re-used between the two groups.
3558:
3559: The resource ID is only used in the big hash, but can be used in the
3560: context of a course to identify a resource easily. (For instance, the
3561: printing system uses it to record which resources from a sequence you
3562: wish to print.)
3563:
3564: X<symb> X<resource, symb>
3565: All resources also have B<symb>s, which uniquely identify a resource
3566: in a course. Many internal LON-CAPA functions expect a symb. A symb
3567: carries along with it the URL of the resource, and the map it appears
3568: in. Symbs are much larger than resource IDs.
3569:
3570: =cut
3571:
3572: sub new {
3573: # magic invocation to create a class instance
3574: my $proto = shift;
3575: my $class = ref($proto) || $proto;
3576: my $self = {};
3577:
3578: weaken($self->{NAV_MAP} = shift);
3579: $self->{ID} = shift;
3580:
3581: $self->{USERNAME} = $self->{NAV_MAP}->{USERNAME};
3582: $self->{DOMAIN} = $self->{NAV_MAP}->{DOMAIN};
3583:
3584: # Store this new resource in the parent nav map's cache.
3585: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3586: $self->{RESOURCE_ERROR} = 0;
3587:
3588: # A hash that can be used by two-pass algorithms to store data
3589: # about this resource in. Not used by the resource object
3590: # directly.
3591: $self->{DATA} = {};
3592:
3593: bless($self);
3594:
3595: return $self;
3596: }
3597:
3598: # private function: simplify the NAV_HASH lookups we keep doing
3599: # pass the name, and to automatically append my ID, pass a true val on the
3600: # second param
3601: sub navHash {
3602: my $self = shift;
3603: my $param = shift;
3604: my $id = shift;
3605: my $arg = $param . ($id?$self->{ID}:"");
3606: if (ref($self) && ref($self->{NAV_MAP}) && defined($arg)) {
3607: return $self->{NAV_MAP}->navhash($arg);
3608: }
3609: return;
3610: }
3611:
3612: =pod
3613:
3614: =head2 Methods
3615:
3616: Once you have a resource object, here's what you can do with it:
3617:
3618: =head3 Attribute Retrieval
3619:
3620: Every resource has certain attributes that can be retrieved and used:
3621:
3622: =over 4
3623:
3624: =item * B<ID>: Every resource has an ID that is unique for that
3625: resource in the course it is in. The ID is actually in the hash
3626: representing the resource, so for a resource object $res, obtain
3627: it via C<$res->{ID}).
3628:
3629: =item * B<compTitle>:
3630:
3631: Returns a "composite title", that is equal to $res->title() if the
3632: resource has a title, and is otherwise the last part of the URL (e.g.,
3633: "problem.problem").
3634:
3635: =item * B<ext>:
3636:
3637: Returns true if the resource is external.
3638:
3639: =item * B<kind>:
3640:
3641: Returns the kind of the resource from the compiled nav map.
3642:
3643: =item * B<randomout>:
3644:
3645: Returns true if this resource was chosen to NOT be shown to the user
3646: by the random map selection feature. In other words, this is usually
3647: false.
3648:
3649: =item * B<randompick>:
3650:
3651: Returns the number of randomly picked items for a map if the randompick
3652: feature is being used on the map.
3653:
3654: =item * B<randomorder>:
3655:
3656: Returns true for a map if the randomorder feature is being used on the
3657: map.
3658:
3659: =item * B<src>:
3660:
3661: Returns the source for the resource.
3662:
3663: =item * B<symb>:
3664:
3665: Returns the symb for the resource.
3666:
3667: =item * B<title>:
3668:
3669: Returns the title of the resource.
3670:
3671: =back
3672:
3673: =cut
3674:
3675: # These info functions can be used directly, as they don't return
3676: # resource information.
3677: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3678: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3679: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3680: sub from { my $self=shift; return $self->navHash("from_", 1); }
3681: # considered private and undocumented
3682: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3683: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3684: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3685: sub randompick {
3686: my $self = shift;
3687: my $randompick = $self->parmval('randompick');
3688: return $randompick;
3689: }
3690: sub randomorder {
3691: my $self = shift;
3692: my $randomorder = $self->parmval('randomorder');
3693: return ($randomorder =~ /^yes$/i);
3694: }
3695: sub link {
3696: my $self=shift;
3697: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3698: return $self->src;
3699: }
3700: sub src {
3701: my $self=shift;
3702: return $self->navHash("src_", 1);
3703: }
3704: sub shown_symb {
3705: my $self=shift;
3706: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3707: return $self->symb();
3708: }
3709: sub id {
3710: my $self=shift;
3711: return $self->{ID};
3712: }
3713: sub enclosing_map_src {
3714: my $self=shift;
3715: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3716: return $self->navHash('map_id_'.$first);
3717: }
3718: sub symb {
3719: my $self=shift;
3720: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3721: my $symbSrc = &Apache::lonnet::declutter($self->src());
3722: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3723: . '___' . $second . '___' . $symbSrc;
3724: return &Apache::lonnet::symbclean($symb);
3725: }
3726: sub wrap_symb {
3727: my $self = shift;
3728: return $self->{NAV_MAP}->wrap_symb($self->symb());
3729: }
3730: sub title {
3731: my $self=shift;
3732: if ($self->{ID} eq '0.0') {
3733: # If this is the top-level map, return the title of the course
3734: # since this map can not be titled otherwise.
3735: return $env{'course.'.$env{'request.course.id'}.'.description'};
3736: }
3737: return $self->navHash("title_", 1); }
3738: # considered private and undocumented
3739: sub to { my $self=shift; return $self->navHash("to_", 1); }
3740: sub condition {
3741: my $self=shift;
3742: my $undercond=$self->navHash("undercond_", 1);
3743: if (!defined($undercond)) { return 1; };
3744: my $condid=$self->navHash("condid_$undercond");
3745: if (!defined($condid)) { return 1; };
3746: my $condition=&Apache::lonnet::directcondval($condid);
3747: return $condition;
3748: }
3749: sub condval {
3750: my $self=shift;
3751: my ($pathname,$filename) =
3752: &Apache::lonnet::split_uri_for_cond($self->src());
3753:
3754: my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
3755: /\&\Q$filename\E\:([\d\|]+)\&/);
3756: if ($match) {
3757: return &Apache::lonnet::condval($1);
3758: }
3759: return 0;
3760: }
3761: sub compTitle {
3762: my $self = shift;
3763: my $title = $self->title();
3764: $title=~s/\&colon\;/\:/gs;
3765: if (!$title) {
3766: $title = $self->src();
3767: $title = substr($title, rindex($title, '/') + 1);
3768: }
3769: return $title;
3770: }
3771:
3772: =pod
3773:
3774: B<Predicate Testing the Resource>
3775:
3776: These methods are shortcuts to deciding if a given resource has a given property.
3777:
3778: =over 4
3779:
3780: =item * B<is_map>:
3781:
3782: Returns true if the resource is a map type.
3783:
3784: =item * B<is_problem>:
3785:
3786: Returns true if the resource is a problem type, false
3787: otherwise. (Looks at the extension on the src field; might need more
3788: to work correctly.)
3789:
3790: =item * B<is_page>:
3791:
3792: Returns true if the resource is a page.
3793:
3794: =item * B<is_sequence>:
3795:
3796: Returns true if the resource is a sequence.
3797:
3798: =back
3799:
3800: =cut
3801:
3802: sub hasResource {
3803: my $self = shift;
3804: return $self->{NAV_MAP}->hasResource(@_);
3805: }
3806:
3807: sub retrieveResources {
3808: my $self = shift;
3809: return $self->{NAV_MAP}->retrieveResources(@_);
3810: }
3811:
3812: sub is_exam {
3813: my ($self,$part) = @_;
3814: my $type = $self->parmval('type',$part);
3815: if ($type eq 'exam') {
3816: return 1;
3817: }
3818: if ($self->src() =~ /\.(exam)$/) {
3819: return 1;
3820: }
3821: return 0;
3822: }
3823: sub is_html {
3824: my $self=shift;
3825: my $src = $self->src();
3826: return ($src =~ /html$/);
3827: }
3828: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3829: sub is_page {
3830: my $self=shift;
3831: my $src = $self->src();
3832: return $self->navHash("is_map_", 1) &&
3833: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3834: }
3835: sub is_practice {
3836: my $self=shift;
3837: my ($part) = @_;
3838: my $type = $self->parmval('type',$part);
3839: if ($type eq 'practice') {
3840: return 1;
3841: }
3842: return 0;
3843: }
3844: sub is_problem {
3845: my $self=shift;
3846: my $src = $self->src();
3847: if ($src =~ /$LONCAPA::assess_re/) {
3848: return !($self->is_practice());
3849: }
3850: return 0;
3851: }
3852: #
3853: # The has below is the set of status that are considered 'incomplete'
3854: #
3855: my %incomplete_hash =
3856: (
3857: TRIES_LEFT() => 1,
3858: OPEN() => 1,
3859: ATTEMPTED() => 1
3860:
3861: );
3862: #
3863: # Return tru if a problem is incomplete... for now incomplete means that
3864: # any part of the problem is incomplete.
3865: # Note that if the resources is not a problem, 0 is returned.
3866: #
3867: sub is_incomplete {
3868: my $self = shift;
3869: if ($self->is_problem()) {
3870: foreach my $part (@{$self->parts()}) {
3871: if (exists($incomplete_hash{$self->status($part)})) {
3872: return 1;
3873: }
3874: }
3875: }
3876: return 0;
3877:
3878: }
3879: sub is_raw_problem {
3880: my $self=shift;
3881: my $src = $self->src();
3882: if ($src =~ /$LONCAPA::assess_re/) {
3883: return 1;
3884: }
3885: return 0;
3886: }
3887:
3888: sub contains_problem {
3889: my $self=shift;
3890: if ($self->is_page()) {
3891: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3892: return $hasProblem;
3893: }
3894: return 0;
3895: }
3896: sub map_contains_problem {
3897: my $self=shift;
3898: if ($self->is_map()) {
3899: my $has_problem=
3900: $self->hasResource($self,sub { $_[0]->is_problem() },1);
3901: return $has_problem;
3902: }
3903: return 0;
3904: }
3905: sub is_sequence {
3906: my $self=shift;
3907: return $self->navHash("is_map_", 1) &&
3908: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3909: }
3910: sub is_survey {
3911: my $self = shift();
3912: my $part = shift();
3913: my $type = $self->parmval('type',$part);
3914: if (($type eq 'survey') || ($type eq 'surveycred')) {
3915: return 1;
3916: }
3917: if ($self->src() =~ /\.(survey)$/) {
3918: return 1;
3919: }
3920: return 0;
3921: }
3922: sub is_anonsurvey {
3923: my $self = shift();
3924: my $part = shift();
3925: my $type = $self->parmval('type',$part);
3926: if (($type eq 'anonsurvey') || ($type eq 'anonsurveycred')) {
3927: return 1;
3928: }
3929: return 0;
3930: }
3931: sub is_task {
3932: my $self=shift;
3933: my $src = $self->src();
3934: return ($src =~ /\.(task)$/)
3935: }
3936:
3937: sub is_empty_sequence {
3938: my $self=shift;
3939: my $src = $self->src();
3940: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3941: }
3942:
3943: # Private method: Shells out to the parmval in the nav map, handler parts.
3944: sub parmval {
3945: my $self = shift;
3946: my $what = shift;
3947: my $part = shift;
3948: if (!defined($part)) {
3949: $part = '0';
3950: }
3951: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3952: }
3953:
3954: =pod
3955:
3956: B<Map Methods>
3957:
3958: These methods are useful for getting information about the map
3959: properties of the resource, if the resource is a map (B<is_map>).
3960:
3961: =over 4
3962:
3963: =item * B<map_finish>:
3964:
3965: Returns a reference to a resource object corresponding to the finish
3966: resource of the map.
3967:
3968: =item * B<map_pc>:
3969:
3970: Returns the pc value of the map, which is the first number that
3971: appears in the resource ID of the resources in the map, and is the
3972: number that appears around the middle of the symbs of the resources in
3973: that map.
3974:
3975: =item * B<map_start>:
3976:
3977: Returns a reference to a resource object corresponding to the start
3978: resource of the map.
3979:
3980: =item * B<map_type>:
3981:
3982: Returns a string with the type of the map in it.
3983:
3984: =item *B<map_hierarchy>:
3985:
3986: Returns a string with a comma-separated ordered list of map_pc IDs
3987: for the hierarchy of maps containing a map, with the top level
3988: map first, then descending to deeper levels, with the enclosing map last.
3989:
3990: =back
3991:
3992: =cut
3993:
3994: sub map_finish {
3995: my $self = shift;
3996: my $src = $self->src();
3997: $src = &Apache::lonnet::clutter($src);
3998: my $res = $self->navHash("map_finish_$src", 0);
3999: $res = $self->{NAV_MAP}->getById($res);
4000: return $res;
4001: }
4002: sub map_pc {
4003: my $self = shift;
4004: my $src = $self->src();
4005: return $self->navHash("map_pc_$src", 0);
4006: }
4007: sub map_start {
4008: my $self = shift;
4009: my $src = $self->src();
4010: $src = &Apache::lonnet::clutter($src);
4011: my $res = $self->navHash("map_start_$src", 0);
4012: $res = $self->{NAV_MAP}->getById($res);
4013: return $res;
4014: }
4015: sub map_type {
4016: my $self = shift;
4017: my $pc = $self->map_pc();
4018: return $self->navHash("map_type_$pc", 0);
4019: }
4020: sub map_hierarchy {
4021: my $self = shift;
4022: my $pc = $self->map_pc();
4023: return $self->navHash("map_hierarchy_$pc", 0);
4024: }
4025:
4026: #####
4027: # Property queries
4028: #####
4029:
4030: # These functions will be responsible for returning the CORRECT
4031: # VALUE for the parameter, no matter what. So while they may look
4032: # like direct calls to parmval, they can be more than that.
4033: # So, for instance, the duedate function should use the "duedatetype"
4034: # information, rather than the resource object user.
4035:
4036: =pod
4037:
4038: =head2 Resource Parameters
4039:
4040: In order to use the resource parameters correctly, the nav map must
4041: have been instantiated with genCourseAndUserOptions set to true, so
4042: the courseopt and useropt is read correctly. Then, you can call these
4043: functions to get the relevant parameters for the resource. Each
4044: function defaults to part "0", but can be directed to another part by
4045: passing the part as the parameter.
4046:
4047: These methods are responsible for getting the parameter correct, not
4048: merely reflecting the contents of the GDBM hashes. As we move towards
4049: dates relative to other dates, these methods should be updated to
4050: reflect that. (Then, anybody using these methods will not have to update
4051: their code.)
4052:
4053: =over 4
4054:
4055: =item * B<printable>
4056:
4057: returns true if the current date is such that the
4058: specified resource part is printable.
4059:
4060: =item * B<resprintable>
4061:
4062: Returns true if all parts in the resource are printable making the
4063: entire resource printable.
4064:
4065: =item * B<acc>
4066:
4067: Get the Client IP/Name Access Control information.
4068:
4069: =item * B<answerdate>:
4070:
4071: Get the answer-reveal date for the problem.
4072:
4073: =item * B<awarded>:
4074:
4075: Gets the awarded value for the problem part. Requires genUserData set to
4076: true when the navmap object was created.
4077:
4078: =item * B<duedate>:
4079:
4080: Get the due date for the problem.
4081:
4082: =item * B<tries>:
4083:
4084: Get the number of tries the student has used on the problem.
4085:
4086: =item * B<maxtries>:
4087:
4088: Get the number of max tries allowed.
4089:
4090: =item * B<opendate>:
4091:
4092: Get the open date for the problem.
4093:
4094: =item * B<sig>:
4095:
4096: Get the significant figures setting.
4097:
4098: =item * B<tol>:
4099:
4100: Get the tolerance for the problem.
4101:
4102: =item * B<tries>:
4103:
4104: Get the number of tries the user has already used on the problem.
4105:
4106: =item * B<type>:
4107:
4108: Get the question type for the problem.
4109:
4110: =item * B<weight>:
4111:
4112: Get the weight for the problem.
4113:
4114: =back
4115:
4116: =cut
4117:
4118: sub printable {
4119:
4120: my ($self, $part) = @_;
4121:
4122: # Get the print open/close dates for the resource.
4123:
4124: my $start = $self->parmval("prinstartdate", $part);
4125: my $end = $self->parmval("printenddate", $part);
4126:
4127: # The following cases apply:
4128: # - No dates set: Printable.
4129: # - Start date set but no end date: Printable if now >= start date.
4130: # - End date set but no start date: Printable if now <= end date.
4131: # - both defined: printable if start <= now <= end
4132: #
4133: my $now = time();
4134:
4135: my $startok = 1;
4136: my $endok = 1;
4137:
4138: if ((defined $start) && ($start ne '')) {
4139: $startok = $start <= $now;
4140: }
4141: if ((defined $end) && ($end != '')) {
4142: $endok = $end >= $now;
4143: }
4144: return $startok && $endok;
4145: }
4146:
4147: sub resprintable {
4148: my $self = shift;
4149:
4150: # get parts...or realize there are no parts.
4151:
4152: my $partsref = $self->parts();
4153: my @parts = @$partsref;
4154:
4155: if ((!defined(@parts)) || (scalar(@parts) == 0)) {
4156: return $self->printable(0);
4157: } else {
4158: foreach my $part (@parts) {
4159: if (!$self->printable($part)) {
4160: return 0;
4161: }
4162: }
4163: return 1;
4164: }
4165: }
4166:
4167: sub acc {
4168: (my $self, my $part) = @_;
4169: my $acc = $self->parmval("acc", $part);
4170: return $acc;
4171: }
4172: sub answerdate {
4173: (my $self, my $part) = @_;
4174: # Handle intervals
4175: my $answerdatetype = $self->parmval("answerdate.type", $part);
4176: my $answerdate = $self->parmval("answerdate", $part);
4177: my $duedate = $self->parmval("duedate", $part);
4178: if ($answerdatetype eq 'date_interval') {
4179: $answerdate = $duedate + $answerdate;
4180: }
4181: return $answerdate;
4182: }
4183: sub awarded {
4184: my $self = shift; my $part = shift;
4185: $self->{NAV_MAP}->get_user_data();
4186: if (!defined($part)) { $part = '0'; }
4187: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
4188: }
4189: sub taskversion {
4190: my $self = shift; my $part = shift;
4191: $self->{NAV_MAP}->get_user_data();
4192: if (!defined($part)) { $part = '0'; }
4193: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.version'};
4194: }
4195: sub taskstatus {
4196: my $self = shift; my $part = shift;
4197: $self->{NAV_MAP}->get_user_data();
4198: if (!defined($part)) { $part = '0'; }
4199: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
4200: }
4201: sub solved {
4202: my $self = shift; my $part = shift;
4203: $self->{NAV_MAP}->get_user_data();
4204: if (!defined($part)) { $part = '0'; }
4205: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.solved'};
4206: }
4207: sub checkedin {
4208: my $self = shift; my $part = shift;
4209: $self->{NAV_MAP}->get_user_data();
4210: if (!defined($part)) { $part = '0'; }
4211: if ($self->is_task()) {
4212: my $version = $self->taskversion($part);
4213: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
4214: } else {
4215: return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
4216: }
4217: }
4218: # this should work exactly like the copy in lonhomework.pm
4219: # Why is there a copy in lonhomework? Why not centralized?
4220: #
4221: # TODO: Centralize duedate.
4222: #
4223:
4224: sub duedate {
4225: (my $self, my $part) = @_;
4226: my $date;
4227: my @interval=$self->parmval("interval", $part);
4228: my $due_date=$self->parmval("duedate", $part);
4229: if ($interval[0] =~ /\d+/) {
4230: my $first_access=&Apache::lonnet::get_first_access($interval[1],
4231: $self->symb);
4232: if (defined($first_access)) {
4233: my $interval = $first_access+$interval[0];
4234: $date = (!$due_date || $interval < $due_date) ? $interval
4235: : $due_date;
4236: } else {
4237: $date = $due_date;
4238: }
4239: } else {
4240: $date = $due_date;
4241: }
4242: return $date;
4243: }
4244: sub handgrade {
4245: (my $self, my $part) = @_;
4246: my @response_ids = $self->responseIds($part);
4247: if (@response_ids) {
4248: foreach my $response_id (@response_ids) {
4249: my $handgrade = $self->parmval("handgrade",$part.'_'.$response_id);
4250: if (lc($handgrade) eq 'yes') {
4251: return 'yes';
4252: }
4253: }
4254: }
4255: my $handgrade = $self->parmval("handgrade", $part);
4256: return $handgrade;
4257: }
4258: sub maxtries {
4259: (my $self, my $part) = @_;
4260: my $maxtries = $self->parmval("maxtries", $part);
4261: return $maxtries;
4262: }
4263: sub opendate {
4264: (my $self, my $part) = @_;
4265: my $opendatetype = $self->parmval("opendate.type", $part);
4266: my $opendate = $self->parmval("opendate", $part);
4267: if ($opendatetype eq 'date_interval') {
4268: my $duedate = $self->duedate($part);
4269: $opendate = $duedate - $opendate;
4270: }
4271: return $opendate;
4272: }
4273: sub problemstatus {
4274: (my $self, my $part) = @_;
4275: my $problemstatus = $self->parmval("problemstatus", $part);
4276: return lc($problemstatus);
4277: }
4278: sub sig {
4279: (my $self, my $part) = @_;
4280: my $sig = $self->parmval("sig", $part);
4281: return $sig;
4282: }
4283: sub tol {
4284: (my $self, my $part) = @_;
4285: my $tol = $self->parmval("tol", $part);
4286: return $tol;
4287: }
4288: sub tries {
4289: my $self = shift;
4290: my $tries = $self->queryRestoreHash('tries', shift);
4291: if (!defined($tries)) { return '0';}
4292: return $tries;
4293: }
4294: sub type {
4295: (my $self, my $part) = @_;
4296: my $type = $self->parmval("type", $part);
4297: return $type;
4298: }
4299: sub weight {
4300: my $self = shift; my $part = shift;
4301: if (!defined($part)) { $part = '0'; }
4302: my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
4303: $self->symb(), $self->{DOMAIN},
4304: $self->{USERNAME},
4305: $env{'request.course.sec'});
4306: return $weight;
4307: }
4308: sub part_display {
4309: my $self= shift(); my $partID = shift();
4310: if (! defined($partID)) { $partID = '0'; }
4311: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
4312: $self->symb);
4313: if (! defined($display) || $display eq '') {
4314: $display = $partID;
4315: }
4316: return $display;
4317: }
4318: sub slot_control {
4319: my $self=shift(); my $part = shift();
4320: if (!defined($part)) { $part = '0'; }
4321: my $useslots = $self->parmval("useslots", $part);
4322: my $availablestudent = $self->parmval("availablestudent", $part);
4323: my $available = $self->parmval("available", $part);
4324: return ($useslots,$availablestudent,$available);
4325: }
4326:
4327: # Multiple things need this
4328: sub getReturnHash {
4329: my $self = shift;
4330:
4331: if (!defined($self->{RETURN_HASH})) {
4332: my %tmpHash = &Apache::lonnet::restore($self->symb(),undef,$self->{DOMAIN},$self->{USERNAME});
4333: $self->{RETURN_HASH} = \%tmpHash;
4334: }
4335: }
4336:
4337: ######
4338: # Status queries
4339: ######
4340:
4341: # These methods query the status of problems.
4342:
4343: # If we need to count parts, this function determines the number of
4344: # parts from the metadata. When called, it returns a reference to a list
4345: # of strings corresponding to the parts. (Thus, using it in a scalar context
4346: # tells you how many parts you have in the problem:
4347: # $partcount = scalar($resource->countParts());
4348: # Don't use $self->{PARTS} directly because you don't know if it's been
4349: # computed yet.
4350:
4351: =pod
4352:
4353: =head2 Resource misc
4354:
4355: Misc. functions for the resource.
4356:
4357: =over 4
4358:
4359: =item * B<hasDiscussion>:
4360:
4361: Returns a false value if there has been discussion since the user last
4362: logged in, true if there has. Always returns false if the discussion
4363: data was not extracted when the nav map was constructed.
4364:
4365: =item * B<last_post_time>:
4366:
4367: Returns a false value if there hasn't been discussion otherwise returns
4368: unix timestamp of last time a discussion posting (or edit) was made.
4369:
4370: =item * B<discussion_info>:
4371:
4372: optional argument is a filter (currently can be 'unread');
4373: returns in scalar context the count of the number of discussion postings.
4374:
4375: returns in list context both the count of postings and a hash ref
4376: containing information about the postings (subject, id, timestamp) in a hash.
4377:
4378: 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.
4379:
4380: =item * B<getFeedback>:
4381:
4382: Gets the feedback for the resource and returns the raw feedback string
4383: for the resource, or the null string if there is no feedback or the
4384: email data was not extracted when the nav map was constructed. Usually
4385: used like this:
4386:
4387: for my $url (split(/\,/, $res->getFeedback())) {
4388: my $link = &escape($url);
4389: ...
4390:
4391: and use the link as appropriate.
4392:
4393: =cut
4394:
4395: sub hasDiscussion {
4396: my $self = shift;
4397: return $self->{NAV_MAP}->hasDiscussion($self->symb());
4398: }
4399:
4400: sub last_post_time {
4401: my $self = shift;
4402: return $self->{NAV_MAP}->last_post_time($self->symb());
4403: }
4404:
4405: sub discussion_info {
4406: my ($self,$filter) = @_;
4407: return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
4408: }
4409:
4410: sub getFeedback {
4411: my $self = shift;
4412: my $source = $self->src();
4413: my $symb = $self->symb();
4414: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4415: return $self->{NAV_MAP}->getFeedback($symb,$source);
4416: }
4417:
4418: sub getErrors {
4419: my $self = shift;
4420: my $source = $self->src();
4421: my $symb = $self->symb();
4422: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
4423: return $self->{NAV_MAP}->getErrors($symb,$source);
4424: }
4425:
4426: =pod
4427:
4428: =item * B<parts>():
4429:
4430: Returns a list reference containing sorted strings corresponding to
4431: each part of the problem. Single part problems have only a part '0'.
4432: Multipart problems do not return their part '0', since they typically
4433: do not really matter.
4434:
4435: =item * B<countParts>():
4436:
4437: Returns the number of parts of the problem a student can answer. Thus,
4438: for single part problems, returns 1. For multipart, it returns the
4439: number of parts in the problem, not including psuedo-part 0.
4440:
4441: =item * B<countResponses>():
4442:
4443: Returns the total number of responses in the problem a student can answer.
4444:
4445: =item * B<responseTypes>():
4446:
4447: Returns a hash whose keys are the response types. The values are the number
4448: of times each response type is used. This is for the I<entire> problem, not
4449: just a single part.
4450:
4451: =item * B<multipart>():
4452:
4453: Returns true if the problem is multipart, false otherwise. Use this instead
4454: of countParts if all you want is multipart/not multipart.
4455:
4456: =item * B<responseType>($part):
4457:
4458: Returns the response type of the part, without the word "response" on the
4459: end. Example return values: 'string', 'essay', 'numeric', etc.
4460:
4461: =item * B<responseIds>($part):
4462:
4463: Retreives the response IDs for the given part as an array reference containing
4464: strings naming the response IDs. This may be empty.
4465:
4466: =back
4467:
4468: =cut
4469:
4470: sub parts {
4471: my $self = shift;
4472:
4473: if ($self->ext) { return []; }
4474:
4475: $self->extractParts();
4476: return $self->{PARTS};
4477: }
4478:
4479: sub countParts {
4480: my $self = shift;
4481:
4482: my $parts = $self->parts();
4483:
4484: # If I left this here, then it's not necessary.
4485: #my $delta = 0;
4486: #for my $part (@$parts) {
4487: # if ($part eq '0') { $delta--; }
4488: #}
4489:
4490: if ($self->{RESOURCE_ERROR}) {
4491: return 0;
4492: }
4493:
4494: return scalar(@{$parts}); # + $delta;
4495: }
4496:
4497: sub countResponses {
4498: my $self = shift;
4499: my $count;
4500: foreach my $part (@{$self->parts()}) {
4501: $count+= scalar($self->responseIds($part));
4502: }
4503: return $count;
4504: }
4505:
4506: sub responseTypes {
4507: my $self = shift;
4508: my %responses;
4509: foreach my $part (@{$self->parts()}) {
4510: foreach my $responsetype ($self->responseType($part)) {
4511: $responses{$responsetype}++ if (defined($responsetype));
4512: }
4513: }
4514: return %responses;
4515: }
4516:
4517: sub multipart {
4518: my $self = shift;
4519: return $self->countParts() > 1;
4520: }
4521:
4522: sub singlepart {
4523: my $self = shift;
4524: return $self->countParts() == 1;
4525: }
4526:
4527: sub responseType {
4528: my $self = shift;
4529: my $part = shift;
4530:
4531: $self->extractParts();
4532: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4533: return @{$self->{RESPONSE_TYPES}->{$part}};
4534: } else {
4535: return undef;
4536: }
4537: }
4538:
4539: sub responseIds {
4540: my $self = shift;
4541: my $part = shift;
4542:
4543: $self->extractParts();
4544: if (defined($self->{RESPONSE_IDS}->{$part})) {
4545: return @{$self->{RESPONSE_IDS}->{$part}};
4546: } else {
4547: return undef;
4548: }
4549: }
4550:
4551: # Private function: Extracts the parts information, both part names and
4552: # part types, and saves it.
4553: sub extractParts {
4554: my $self = shift;
4555:
4556: return if (defined($self->{PARTS}));
4557: return if ($self->ext);
4558:
4559: $self->{PARTS} = [];
4560:
4561: my %parts;
4562:
4563: # Retrieve part count, if this is a problem
4564: if ($self->is_problem()) {
4565: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4566: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4567:
4568: if ($partorder) {
4569: my @parts;
4570: for my $part (split (/,/,$partorder)) {
4571: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4572: push @parts, $part;
4573: $parts{$part} = 1;
4574: }
4575: }
4576: $self->{PARTS} = \@parts;
4577: } else {
4578: if (!$metadata) {
4579: $self->{RESOURCE_ERROR} = 1;
4580: $self->{PARTS} = [];
4581: $self->{PART_TYPE} = {};
4582: return;
4583: }
4584: foreach my $entry (split(/\,/,$metadata)) {
4585: if ($entry =~ /^(?:part|Task)_(.*)$/) {
4586: my $part = $1;
4587: # This floods the logs if it blows up
4588: if (defined($parts{$part})) {
4589: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4590: }
4591:
4592: # check to see if part is turned off.
4593:
4594: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4595: $parts{$part} = 1;
4596: }
4597: }
4598: }
4599: my @sortedParts = sort keys %parts;
4600: $self->{PARTS} = \@sortedParts;
4601: }
4602:
4603:
4604: # These hashes probably do not need names that end with "Hash"....
4605: my %responseIdHash;
4606: my %responseTypeHash;
4607:
4608:
4609: # Init the responseIdHash
4610: foreach my $part (@{$self->{PARTS}}) {
4611: $responseIdHash{$part} = [];
4612: }
4613:
4614: # Now, the unfortunate thing about this is that parts, part name, and
4615: # response id are delimited by underscores, but both the part
4616: # name and response id can themselves have underscores in them.
4617: # So we have to use our knowlege of part names to figure out
4618: # where the part names begin and end, and even then, it is possible
4619: # to construct ambiguous situations.
4620: foreach my $data (split /,/, $metadata) {
4621: if ($data =~ /^([a-zA-Z]+)response_(.*)/
4622: || $data =~ /^(Task)_(.*)/) {
4623: my $responseType = $1;
4624: my $partStuff = $2;
4625: my $partIdSoFar = '';
4626: my @partChunks = split /_/, $partStuff;
4627: my $i = 0;
4628: for ($i = 0; $i < scalar(@partChunks); $i++) {
4629: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4630: $partIdSoFar .= $partChunks[$i];
4631: if ($parts{$partIdSoFar}) {
4632: my @otherChunks = @partChunks[$i+1..$#partChunks];
4633: my $responseId = join('_', @otherChunks);
4634: if ($self->is_task()) {
4635: push(@{$responseIdHash{$partIdSoFar}},
4636: $partIdSoFar);
4637: } else {
4638: push(@{$responseIdHash{$partIdSoFar}},
4639: $responseId);
4640: }
4641: push(@{$responseTypeHash{$partIdSoFar}},
4642: $responseType);
4643: }
4644: }
4645: }
4646: }
4647: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4648: #
4649: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4650: if ($resorder) {
4651: my @resorder=split(/,/,$resorder);
4652: foreach my $part (keys(%responseIdHash)) {
4653: my $i=0;
4654: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4655: my @neworder;
4656: foreach my $possibleid (@resorder) {
4657: if (exists($resids{$possibleid})) {
4658: push(@neworder,$resids{$possibleid});
4659: }
4660: }
4661: my @ids;
4662: my @type;
4663: foreach my $element (@neworder) {
4664: push (@ids,$responseIdHash{$part}->[$element]);
4665: push (@type,$responseTypeHash{$part}->[$element]);
4666: }
4667: $responseIdHash{$part}=\@ids;
4668: $responseTypeHash{$part}=\@type;
4669: }
4670: }
4671: $self->{RESPONSE_IDS} = \%responseIdHash;
4672: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4673: }
4674:
4675: return;
4676: }
4677:
4678: =pod
4679:
4680: =head2 Resource Status
4681:
4682: Problem resources have status information, reflecting their various
4683: dates and completion statuses.
4684:
4685: There are two aspects to the status: the date-related information and
4686: the completion information.
4687:
4688: Idiomatic usage of these two methods would probably look something
4689: like
4690:
4691: foreach my $part ($resource->parts()) {
4692: my $dateStatus = $resource->getDateStatus($part);
4693: my $completionStatus = $resource->getCompletionStatus($part);
4694:
4695: or
4696:
4697: my $status = $resource->status($part);
4698:
4699: ... use it here ...
4700: }
4701:
4702: Which you use depends on exactly what you are looking for. The
4703: status() function has been optimized for the nav maps display and may
4704: not precisely match what you need elsewhere.
4705:
4706: The symbolic constants shown below can be accessed through the
4707: resource object: C<$res->OPEN>.
4708:
4709: =over 4
4710:
4711: =item * B<getDateStatus>($part):
4712:
4713: ($part defaults to 0). A convenience function that returns a symbolic
4714: constant telling you about the date status of the part. The possible
4715: return values are:
4716:
4717: =back
4718:
4719: B<Date Codes>
4720:
4721: =over 4
4722:
4723: =item * B<OPEN_LATER>:
4724:
4725: The problem will be opened later.
4726:
4727: =item * B<OPEN>:
4728:
4729: Open and not yet due.
4730:
4731:
4732: =item * B<PAST_DUE_ANSWER_LATER>:
4733:
4734: The due date has passed, but the answer date has not yet arrived.
4735:
4736: =item * B<PAST_DUE_NO_ANSWER>:
4737:
4738: The due date has passed and there is no answer opening date set.
4739:
4740: =item * B<ANSWER_OPEN>:
4741:
4742: The answer date is here.
4743:
4744: =item * B<NETWORK_FAILURE>:
4745:
4746: The information is unknown due to network failure.
4747:
4748: =back
4749:
4750: =cut
4751:
4752: # Apparently the compiler optimizes these into constants automatically
4753: sub OPEN_LATER { return 0; }
4754: sub OPEN { return 1; }
4755: sub PAST_DUE_NO_ANSWER { return 2; }
4756: sub PAST_DUE_ANSWER_LATER { return 3; }
4757: sub ANSWER_OPEN { return 4; }
4758: sub NOTHING_SET { return 5; }
4759: sub NETWORK_FAILURE { return 100; }
4760:
4761: # getDateStatus gets the date status for a given problem part.
4762: # Because answer date, due date, and open date are fully independent
4763: # (i.e., it is perfectly possible to *only* have an answer date),
4764: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4765: # (past, future, none given). This function handles this with a decision
4766: # tree. Read the comments to follow the decision tree.
4767:
4768: sub getDateStatus {
4769: my $self = shift;
4770: my $part = shift;
4771: $part = "0" if (!defined($part));
4772:
4773: # Always return network failure if there was one.
4774: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4775:
4776: my $now = time();
4777:
4778: my $open = $self->opendate($part);
4779: my $due = $self->duedate($part);
4780: my $answer = $self->answerdate($part);
4781:
4782: if (!$open && !$due && !$answer) {
4783: # no data on the problem at all
4784: # should this be the same as "open later"? think multipart.
4785: return $self->NOTHING_SET;
4786: }
4787: if (!$open || $now < $open) {return $self->OPEN_LATER}
4788: if (!$due || $now < $due) {return $self->OPEN}
4789: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4790: if ($answer) { return $self->ANSWER_OPEN; }
4791: return PAST_DUE_NO_ANSWER;
4792: }
4793:
4794: =pod
4795:
4796: B<>
4797:
4798: =over 4
4799:
4800: =item * B<getCompletionStatus>($part):
4801:
4802: ($part defaults to 0.) A convenience function that returns a symbolic
4803: constant telling you about the completion status of the part, with the
4804: following possible results:
4805:
4806: =back
4807:
4808: B<Completion Codes>
4809:
4810: =over 4
4811:
4812: =item * B<NOT_ATTEMPTED>:
4813:
4814: Has not been attempted at all.
4815:
4816: =item * B<INCORRECT>:
4817:
4818: Attempted, but wrong by student.
4819:
4820: =item * B<INCORRECT_BY_OVERRIDE>:
4821:
4822: Attempted, but wrong by instructor override.
4823:
4824: =item * B<CORRECT>:
4825:
4826: Correct or correct by instructor.
4827:
4828: =item * B<CORRECT_BY_OVERRIDE>:
4829:
4830: Correct by instructor override.
4831:
4832: =item * B<EXCUSED>:
4833:
4834: Excused. Not yet implemented.
4835:
4836: =item * B<NETWORK_FAILURE>:
4837:
4838: Information not available due to network failure.
4839:
4840: =item * B<ATTEMPTED>:
4841:
4842: Attempted, and not yet graded.
4843:
4844: =item * B<CREDIT_ATTEMPTED>:
4845:
4846: Attempted, and credit received for attempt (survey and anonymous survey only).
4847:
4848: =back
4849:
4850: =cut
4851:
4852: sub NOT_ATTEMPTED { return 10; }
4853: sub INCORRECT { return 11; }
4854: sub INCORRECT_BY_OVERRIDE { return 12; }
4855: sub CORRECT { return 13; }
4856: sub CORRECT_BY_OVERRIDE { return 14; }
4857: sub EXCUSED { return 15; }
4858: sub ATTEMPTED { return 16; }
4859: sub CREDIT_ATTEMPTED { return 17; }
4860:
4861: sub getCompletionStatus {
4862: my $self = shift;
4863: my $part = shift;
4864: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4865:
4866: my $status = $self->queryRestoreHash('solved', $part);
4867:
4868: # Left as separate if statements in case we ever do more with this
4869: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4870: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4871: if ($status eq 'correct_by_override') {
4872: return $self->CORRECT_BY_OVERRIDE;
4873: }
4874: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4875: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4876: if ($status eq 'excused') {return $self->EXCUSED; }
4877: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4878: if ($status eq 'credit_attempted') {
4879: if ($self->is_anonsurvey($part) || $self->is_survey($part)) {
4880: return $self->CREDIT_ATTEMPTED;
4881: } else {
4882: return $self->ATTEMPTED;
4883: }
4884: }
4885: return $self->NOT_ATTEMPTED;
4886: }
4887:
4888: sub queryRestoreHash {
4889: my $self = shift;
4890: my $hashentry = shift;
4891: my $part = shift;
4892: $part = "0" if (!defined($part) || $part eq '');
4893: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4894:
4895: $self->getReturnHash();
4896:
4897: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4898: }
4899:
4900: =pod
4901:
4902: B<Composite Status>
4903:
4904: Along with directly returning the date or completion status, the
4905: resource object includes a convenience function B<status>() that will
4906: combine the two status tidbits into one composite status that can
4907: represent the status of the resource as a whole. This method represents
4908: the concept of the thing we want to display to the user on the nav maps
4909: screen, which is a combination of completion and open status. The precise logic is
4910: documented in the comments of the status method. The following results
4911: may be returned, all available as methods on the resource object
4912: ($res->NETWORK_FAILURE): In addition to the return values that match
4913: the date or completion status, this function can return "ANSWER_SUBMITTED"
4914: if that problemstatus parameter value is set to No, suppressing the
4915: incorrect/correct feedback.
4916:
4917: =over 4
4918:
4919: =item * B<NETWORK_FAILURE>:
4920:
4921: The network has failed and the information is not available.
4922:
4923: =item * B<NOTHING_SET>:
4924:
4925: No dates have been set for this problem (part) at all. (Because only
4926: certain parts of a multi-part problem may be assigned, this can not be
4927: collapsed into "open later", as we do not know a given part will EVER
4928: be opened. For single part, this is the same as "OPEN_LATER".)
4929:
4930: =item * B<CORRECT>:
4931:
4932: For any reason at all, the part is considered correct.
4933:
4934: =item * B<EXCUSED>:
4935:
4936: For any reason at all, the problem is excused.
4937:
4938: =item * B<PAST_DUE_NO_ANSWER>:
4939:
4940: The problem is past due, not considered correct, and no answer date is
4941: set.
4942:
4943: =item * B<PAST_DUE_ANSWER_LATER>:
4944:
4945: The problem is past due, not considered correct, and an answer date in
4946: the future is set.
4947:
4948: =item * B<ANSWER_OPEN>:
4949:
4950: The problem is past due, not correct, and the answer is now available.
4951:
4952: =item * B<OPEN_LATER>:
4953:
4954: The problem is not yet open.
4955:
4956: =item * B<TRIES_LEFT>:
4957:
4958: The problem is open, has been tried, is not correct, but there are
4959: tries left.
4960:
4961: =item * B<INCORRECT>:
4962:
4963: The problem is open, and all tries have been used without getting the
4964: correct answer.
4965:
4966: =item * B<OPEN>:
4967:
4968: The item is open and not yet tried.
4969:
4970: =item * B<ATTEMPTED>:
4971:
4972: The problem has been attempted.
4973:
4974: =item * B<CREDIT_ATTEMPTED>:
4975:
4976: The problem has been attempted, and credit given for the attempt (survey and anonymous survey only).
4977:
4978: =item * B<ANSWER_SUBMITTED>:
4979:
4980: An answer has been submitted, but the student should not see it.
4981:
4982: =back
4983:
4984: =cut
4985:
4986: sub TRIES_LEFT { return 20; }
4987: sub ANSWER_SUBMITTED { return 21; }
4988: sub PARTIALLY_CORRECT { return 22; }
4989:
4990: sub RESERVED_LATER { return 30; }
4991: sub RESERVED { return 31; }
4992: sub RESERVED_LOCATION { return 32; }
4993: sub RESERVABLE { return 33; }
4994: sub RESERVABLE_LATER { return 34; }
4995: sub NOTRESERVABLE { return 35; }
4996: sub NOT_IN_A_SLOT { return 36; }
4997: sub NEEDS_CHECKIN { return 37; }
4998: sub WAITING_FOR_GRADE { return 38; }
4999: sub UNKNOWN { return 39; }
5000:
5001: sub status {
5002: my $self = shift;
5003: my $part = shift;
5004: if (!defined($part)) { $part = "0"; }
5005: my $completionStatus = $self->getCompletionStatus($part);
5006: my $dateStatus = $self->getDateStatus($part);
5007:
5008: # What we have is a two-dimensional matrix with 4 entries on one
5009: # dimension and 5 entries on the other, which we want to colorize,
5010: # plus network failure and "no date data at all".
5011:
5012: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
5013: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
5014:
5015: my $suppressFeedback = 0;
5016: if (($self->problemstatus($part) eq 'no') ||
5017: ($self->problemstatus($part) eq 'no_feedback_ever')) {
5018: $suppressFeedback = 1;
5019: }
5020: # If there's an answer date and we're past it, don't
5021: # suppress the feedback; student should know
5022: if ($self->duedate($part) && $self->duedate($part) < time() &&
5023: $self->answerdate($part) && $self->answerdate($part) < time()) {
5024: $suppressFeedback = 0;
5025: }
5026:
5027: # There are a few whole rows we can dispose of:
5028: if ($completionStatus == CORRECT ||
5029: $completionStatus == CORRECT_BY_OVERRIDE ) {
5030: if ( $suppressFeedback ) { return ANSWER_SUBMITTED }
5031: my $awarded=$self->awarded($part);
5032: if ($awarded < 1 && $awarded > 0) {
5033: return PARTIALLY_CORRECT;
5034: } elsif ($awarded<1) {
5035: return INCORRECT;
5036: }
5037: return CORRECT;
5038: }
5039:
5040: # If it's WRONG... and not open
5041: if ( ($completionStatus == INCORRECT ||
5042: $completionStatus == INCORRECT_BY_OVERRIDE)
5043: && (!$self->opendate($part) || $self->opendate($part) > time()) ) {
5044: return INCORRECT;
5045: }
5046:
5047: if ($completionStatus == ATTEMPTED) {
5048: return ATTEMPTED;
5049: }
5050:
5051: if ($completionStatus == CREDIT_ATTEMPTED) {
5052: return CREDIT_ATTEMPTED;
5053: }
5054:
5055: # If it's EXCUSED, then return that no matter what
5056: if ($completionStatus == EXCUSED) {
5057: return EXCUSED;
5058: }
5059:
5060: if ($dateStatus == NOTHING_SET) {
5061: return NOTHING_SET;
5062: }
5063:
5064: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
5065: # by 4 matrix (date statuses).
5066:
5067: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
5068: $dateStatus == PAST_DUE_NO_ANSWER ) {
5069: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
5070: }
5071:
5072: if ($dateStatus == ANSWER_OPEN) {
5073: return ANSWER_OPEN;
5074: }
5075:
5076: # Now: (incorrect, incorrect_override, not_attempted) x
5077: # (open_later), (open)
5078:
5079: if ($dateStatus == OPEN_LATER) {
5080: return OPEN_LATER;
5081: }
5082:
5083: # If it's WRONG...
5084: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
5085: # and there are TRIES LEFT:
5086: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
5087: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
5088: }
5089: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
5090: }
5091:
5092: # Otherwise, it's untried and open
5093: return OPEN;
5094: }
5095:
5096: sub check_for_slot {
5097: my $self = shift;
5098: my $part = shift;
5099: my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
5100: if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
5101: my @slots = (split(/:/,$availablestudent),split(/:/,$available));
5102: my $cid=$env{'request.course.id'};
5103: my $cdom=$env{'course.'.$cid.'.domain'};
5104: my $cnum=$env{'course.'.$cid.'.num'};
5105: my $now = time;
5106: if (@slots > 0) {
5107: my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
5108: if (&Apache::lonnet::error(%slots)) {
5109: return (UNKNOWN);
5110: }
5111: my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots);
5112: my ($checkedin,$checkedinslot);
5113: foreach my $slot_name (@sorted_slots) {
5114: next if (!defined($slots{$slot_name}) ||
5115: !ref($slots{$slot_name}));
5116: my $end = $slots{$slot_name}->{'endtime'};
5117: my $start = $slots{$slot_name}->{'starttime'};
5118: my $ip = $slots{$slot_name}->{'ip'};
5119: if ($self->simpleStatus() == OPEN) {
5120: my $startreserve = $slots{$slot_name}->{'startreserve'};
5121: my @proctors;
5122: if ($slots{$slot_name}->{'proctor'} ne '') {
5123: @proctors = split(',',$slots{$slot_name}->{'proctor'});
5124: }
5125: if ($end > $now) {
5126: ($checkedin,$checkedinslot) = $self->checkedin();
5127: if ($startreserve < $now) {
5128: if ($start > $now) {
5129: return (RESERVED_LATER,$start,$slot_name);
5130: } else {
5131: if ($ip ne '') {
5132: if (!&Apache::loncommon::check_ip_acc($ip)) {
5133: return (RESERVED_LOCATION,$ip,$slot_name);
5134: }
5135: }
5136: if (@proctors > 0) {
5137: unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
5138: ($checkedinslot eq $slot_name)) {
5139: return (NEEDS_CHECKIN,undef,$slot_name);
5140: }
5141: }
5142: return (RESERVED,$end,$slot_name);
5143: }
5144: } else {
5145: if ($start > $now) {
5146: return (RESERVABLE,$startreserve,$slot_name);
5147: }
5148: }
5149: }
5150: }
5151: }
5152: my ($is_correct,$got_grade);
5153: if ($self->is_task()) {
5154: my $taskstatus = $self->taskstatus();
5155: $is_correct = (($taskstatus eq 'pass') ||
5156: ($self->solved() =~ /^correct_/));
5157: $got_grade = ($taskstatus =~ /^(?:pass|fail)$/);
5158: } else {
5159: $got_grade = 1;
5160: $is_correct = ($self->solved() =~ /^correct_/);
5161: }
5162: ($checkedin,$checkedinslot) = $self->checkedin();
5163: if ($checkedin) {
5164: if (!$got_grade) {
5165: return (WAITING_FOR_GRADE);
5166: } elsif ($is_correct) {
5167: return (CORRECT);
5168: }
5169: }
5170: return(NOT_IN_A_SLOT);
5171: } else {
5172: if (!$future_slots_checked) {
5173: $future_slots = &get_future_slots($cdom,$cnum,$now);
5174: $future_slots_checked = 1;
5175: }
5176: if ($future_slots) {
5177: return(NOT_IN_A_SLOT);
5178: }
5179: return(NOTRESERVABLE);
5180: }
5181: }
5182: return;
5183: }
5184:
5185: sub get_future_slots {
5186: my ($cdom,$cnum,$now) = @_;
5187: my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
5188: my $future_slots = 0;
5189: foreach my $slot (keys(%slots)) {
5190: if (($slots{$slot}->{'starttime'} > $now) &&
5191: ($slots{$slot}->{'endtime'} > $now)) {
5192: $future_slots ++;
5193: }
5194: }
5195: return $future_slots;
5196: }
5197:
5198: sub CLOSED { return 23; }
5199: sub ERROR { return 24; }
5200:
5201: =pod
5202:
5203: B<Simple Status>
5204:
5205: Convenience method B<simpleStatus> provides a "simple status" for the resource.
5206: "Simple status" corresponds to "which icon is shown on the
5207: Navmaps". There are six "simple" statuses:
5208:
5209: =over 4
5210:
5211: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
5212:
5213: =item * B<OPEN>: The problem is open and unattempted.
5214:
5215: =item * B<CORRECT>: The problem is correct for any reason.
5216:
5217: =item * B<INCORRECT>: The problem is incorrect and can still be
5218: completed successfully.
5219:
5220: =item * B<ATTEMPTED>: The problem has been attempted, but the student
5221: does not know if they are correct. (The ellipsis icon.)
5222:
5223: =item * B<ERROR>: There is an error retrieving information about this
5224: problem.
5225:
5226: =back
5227:
5228: =cut
5229:
5230: # This hash maps the composite status to this simple status, and
5231: # can be used directly, if you like
5232: my %compositeToSimple =
5233: (
5234: NETWORK_FAILURE() => ERROR,
5235: NOTHING_SET() => CLOSED,
5236: CORRECT() => CORRECT,
5237: PARTIALLY_CORRECT() => PARTIALLY_CORRECT,
5238: EXCUSED() => CORRECT,
5239: PAST_DUE_NO_ANSWER() => INCORRECT,
5240: PAST_DUE_ANSWER_LATER() => INCORRECT,
5241: ANSWER_OPEN() => INCORRECT,
5242: OPEN_LATER() => CLOSED,
5243: TRIES_LEFT() => OPEN,
5244: INCORRECT() => INCORRECT,
5245: OPEN() => OPEN,
5246: ATTEMPTED() => ATTEMPTED,
5247: CREDIT_ATTEMPTED() => CORRECT,
5248: ANSWER_SUBMITTED() => ATTEMPTED
5249: );
5250:
5251: sub simpleStatus {
5252: my $self = shift;
5253: my $part = shift;
5254: my $status = $self->status($part);
5255: return $compositeToSimple{$status};
5256: }
5257:
5258: =pod
5259:
5260: B<simpleStatusCount> will return an array reference containing, in
5261: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
5262: and ERROR parts the given problem has.
5263:
5264: =cut
5265:
5266: # This maps the status to the slot we want to increment
5267: my %statusToSlotMap =
5268: (
5269: OPEN() => 0,
5270: CLOSED() => 1,
5271: CORRECT() => 2,
5272: INCORRECT() => 3,
5273: ATTEMPTED() => 4,
5274: ERROR() => 5
5275: );
5276:
5277: sub statusToSlot { return $statusToSlotMap{shift()}; }
5278:
5279: sub simpleStatusCount {
5280: my $self = shift;
5281:
5282: my @counts = (0, 0, 0, 0, 0, 0, 0);
5283: foreach my $part (@{$self->parts()}) {
5284: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
5285: }
5286:
5287: return \@counts;
5288: }
5289:
5290: =pod
5291:
5292: B<Completable>
5293:
5294: The completable method represents the concept of I<whether the student can
5295: currently do the problem>. If the student can do the problem, which means
5296: that it is open, there are tries left, and if the problem is manually graded
5297: or the grade is suppressed via problemstatus, the student has not tried it
5298: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
5299: either the student has tried it and there is no feedback, or that for
5300: some reason it is no longer completable (not open yet, successfully completed,
5301: out of tries, etc.). As an example, this is used as the filter for the
5302: "Uncompleted Homework" option for the nav maps.
5303:
5304: If this does not quite meet your needs, do not fiddle with it (unless you are
5305: fixing it to better match the student's conception of "completable" because
5306: it's broken somehow)... make a new method.
5307:
5308: =cut
5309:
5310: sub completable {
5311: my $self = shift;
5312: if (!$self->is_problem()) { return 0; }
5313: my $partCount = $self->countParts();
5314:
5315: foreach my $part (@{$self->parts()}) {
5316: if ($part eq '0' && $partCount != 1) { next; }
5317: my $status = $self->status($part);
5318: # "If any of the parts are open, or have tries left (implies open),
5319: # and it is not "attempted" (manually graded problem), it is
5320: # not "complete"
5321: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
5322: $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
5323: $status == ANSWER_SUBMITTED() ) {
5324: # did this part already, as well as we can
5325: next;
5326: }
5327: if ($status == OPEN() || $status == TRIES_LEFT()) {
5328: return 1;
5329: }
5330: }
5331:
5332: # If all the parts were complete, so was this problem.
5333: return 0;
5334: }
5335:
5336: =pod
5337:
5338: =head2 Resource/Nav Map Navigation
5339:
5340: =over 4
5341:
5342: =item * B<getNext>():
5343:
5344: Retreive an array of the possible next resources after this
5345: one. Always returns an array, even in the one- or zero-element case.
5346:
5347: =item * B<getPrevious>():
5348:
5349: Retreive an array of the possible previous resources from this
5350: one. Always returns an array, even in the one- or zero-element case.
5351:
5352: =cut
5353:
5354: sub getNext {
5355: my $self = shift;
5356: my @branches;
5357: my $to = $self->to();
5358: foreach my $branch ( split(/,/, $to) ) {
5359: my $choice = $self->{NAV_MAP}->getById($branch);
5360: #if (!$choice->condition()) { next; }
5361: my $next = $choice->goesto();
5362: $next = $self->{NAV_MAP}->getById($next);
5363:
5364: push @branches, $next;
5365: }
5366: return \@branches;
5367: }
5368:
5369: sub getPrevious {
5370: my $self = shift;
5371: my @branches;
5372: my $from = $self->from();
5373: foreach my $branch ( split /,/, $from) {
5374: my $choice = $self->{NAV_MAP}->getById($branch);
5375: my $prev = $choice->comesfrom();
5376: $prev = $self->{NAV_MAP}->getById($prev);
5377:
5378: push @branches, $prev;
5379: }
5380: return \@branches;
5381: }
5382:
5383: sub browsePriv {
5384: my $self = shift;
5385: if (defined($self->{BROWSE_PRIV})) {
5386: return $self->{BROWSE_PRIV};
5387: }
5388:
5389: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
5390: $self->symb());
5391: }
5392:
5393: =pod
5394:
5395: =back
5396:
5397: =cut
5398:
5399: 1;
5400:
5401: __END__
5402:
5403:
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