1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.179 2003/04/22 18:38:47 bowersj2 Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # (Page Handler
29: #
30: # (TeX Content Handler
31: #
32: # 05/29/00,05/30 Gerd Kortemeyer)
33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
35: #
36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
37: # YEAR=2002
38: # 1/1 Gerd Kortemeyer
39: # Oct-Nov Jeremy Bowers
40: # YEAR=2003
41: # Jeremy Bowers ... lots of days
42:
43: package Apache::lonnavmaps;
44:
45: use strict;
46: use Apache::Constants qw(:common :http);
47: use Apache::loncommon();
48: use Apache::lonmenu();
49: use POSIX qw (floor strftime);
50:
51: # symbolic constants
52: sub SYMB { return 1; }
53: sub URL { return 2; }
54: sub NOTHING { return 3; }
55:
56: # Some data
57:
58: my $resObj = "Apache::lonnavmaps::resource";
59:
60: # Keep these mappings in sync with lonquickgrades, which uses the colors
61: # instead of the icons.
62: my %statusIconMap =
63: ( $resObj->NETWORK_FAILURE => '',
64: $resObj->NOTHING_SET => '',
65: $resObj->CORRECT => 'navmap.correct.gif',
66: $resObj->EXCUSED => 'navmap.correct.gif',
67: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
68: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
69: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
70: $resObj->OPEN_LATER => '',
71: $resObj->TRIES_LEFT => 'navmap.open.gif',
72: $resObj->INCORRECT => 'navmap.wrong.gif',
73: $resObj->OPEN => 'navmap.open.gif',
74: $resObj->ATTEMPTED => 'navmap.open.gif' );
75:
76: my %iconAltTags =
77: ( 'navmap.correct.gif' => 'Correct',
78: 'navmap.wrong.gif' => 'Incorrect',
79: 'navmap.open.gif' => 'Open' );
80:
81: # Defines a status->color mapping, null string means don't color
82: my %colormap =
83: ( $resObj->NETWORK_FAILURE => '',
84: $resObj->CORRECT => '',
85: $resObj->EXCUSED => '#3333FF',
86: $resObj->PAST_DUE_ANSWER_LATER => '',
87: $resObj->PAST_DUE_NO_ANSWER => '',
88: $resObj->ANSWER_OPEN => '#006600',
89: $resObj->OPEN_LATER => '',
90: $resObj->TRIES_LEFT => '',
91: $resObj->INCORRECT => '',
92: $resObj->OPEN => '',
93: $resObj->NOTHING_SET => '' );
94: # And a special case in the nav map; what to do when the assignment
95: # is not yet done and due in less then 24 hours
96: my $hurryUpColor = "#FF0000";
97:
98: sub handler {
99: my $r = shift;
100: real_handler($r);
101: }
102:
103: sub real_handler {
104: my $r = shift;
105:
106: # Handle header-only request
107: if ($r->header_only) {
108: if ($ENV{'browser.mathml'}) {
109: $r->content_type('text/xml');
110: } else {
111: $r->content_type('text/html');
112: }
113: $r->send_http_header;
114: return OK;
115: }
116:
117: # Send header, don't cache this page
118: if ($ENV{'browser.mathml'}) {
119: $r->content_type('text/xml');
120: } else {
121: $r->content_type('text/html');
122: }
123: &Apache::loncommon::no_cache($r);
124: $r->send_http_header;
125:
126: # Create the nav map
127: my $navmap = Apache::lonnavmaps::navmap->new(
128: $ENV{"request.course.fn"}.".db",
129: $ENV{"request.course.fn"}."_parms.db", 1, 1);
130:
131:
132: if (!defined($navmap)) {
133: my $requrl = $r->uri;
134: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
135: return HTTP_NOT_ACCEPTABLE;
136: }
137:
138: $r->print("<html><head>\n");
139: $r->print("<title>Navigate Course Contents</title>");
140: # ------------------------------------------------------------ Get query string
141: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
142:
143: # ----------------------------------------------------- Force menu registration
144: my $addentries='';
145: if ($ENV{'form.register'}) {
146: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
147: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
148: $r->print(&Apache::lonmenu::registerurl(1));
149: }
150:
151: # Header
152: $r->print('</head>'.
153: &Apache::loncommon::bodytag('Navigate Course Contents','',
154: $addentries,'','',$ENV{'form.register'}));
155: $r->print('<script>window.focus();</script>');
156:
157: $r->rflush();
158:
159: # Now that we've displayed some stuff to the user, init the navmap
160: $navmap->init();
161:
162: $r->print('<br> ');
163: $r->rflush();
164:
165: # Check that it's defined
166: if (!($navmap->courseMapDefined())) {
167: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
168: '</body></html>');
169: return OK;
170: }
171:
172: # See if there's only one map in the top-level, if we don't
173: # already have a filter... if so, automatically display it
174: if ($ENV{QUERY_STRING} !~ /filter/) {
175: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
176: my $depth = 1;
177: $iterator->next();
178: my $curRes = $iterator->next();
179: my $sequenceCount = 0;
180: my $sequenceId;
181: while ($depth > 0) {
182: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
183: if ($curRes == $iterator->END_MAP()) { $depth--; }
184:
185: if (ref($curRes) && $curRes->is_sequence()) {
186: $sequenceCount++;
187: $sequenceId = $curRes->map_pc();
188: }
189:
190: $curRes = $iterator->next();
191: }
192:
193: if ($sequenceCount == 1) {
194: # The automatic iterator creation in the render call
195: # will pick this up. We know the condition because
196: # the defined($ENV{'form.filter'}) also ensures this
197: # is a fresh call.
198: $ENV{'form.filter'} = "$sequenceId";
199: }
200: }
201:
202: # renderer call
203: my $render = render({ 'cols' => [0,1,2,3],
204: 'url' => '/adm/navmaps',
205: 'navmap' => $navmap,
206: 'suppressNavmap' => 1,
207: 'r' => $r});
208:
209: $navmap->untieHashes();
210:
211: $r->print("</body></html>");
212: $r->rflush();
213:
214: return OK;
215: }
216:
217: # Convenience functions: Returns a string that adds or subtracts
218: # the second argument from the first hash, appropriate for the
219: # query string that determines which folders to recurse on
220: sub addToFilter {
221: my $hashIn = shift;
222: my $addition = shift;
223: my %hash = %$hashIn;
224: $hash{$addition} = 1;
225:
226: return join (",", keys(%hash));
227: }
228:
229: sub removeFromFilter {
230: my $hashIn = shift;
231: my $subtraction = shift;
232: my %hash = %$hashIn;
233:
234: delete $hash{$subtraction};
235: return join(",", keys(%hash));
236: }
237:
238: # Convenience function: Given a stack returned from getStack on the iterator,
239: # return the correct src() value.
240: # Later, this should add an anchor when we start putting anchors in pages.
241: sub getLinkForResource {
242: my $stack = shift;
243: my $res;
244:
245: # Check to see if there are any pages in the stack
246: foreach $res (@$stack) {
247: if (defined($res) && $res->is_page()) {
248: return $res->src();
249: }
250: }
251:
252: # Failing that, return the src of the last resource that is defined
253: # (when we first recurse on a map, it puts an undefined resource
254: # on the bottom because $self->{HERE} isn't defined yet, and we
255: # want the src for the map anyhow)
256: foreach (@$stack) {
257: if (defined($_)) { $res = $_; }
258: }
259:
260: return $res->src();
261: }
262:
263: # Convenience function: This seperates the logic of how to create
264: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
265: # etc.) into a seperate function. It takes a resource object as the
266: # first parameter, and the part number of the resource as the second.
267: # It's basically a big switch statement on the status of the resource.
268:
269: sub getDescription {
270: my $res = shift;
271: my $part = shift;
272: my $status = $res->status($part);
273:
274: if ($status == $res->NETWORK_FAILURE) { return ""; }
275: if ($status == $res->NOTHING_SET) {
276: return "Not currently assigned.";
277: }
278: if ($status == $res->OPEN_LATER) {
279: return "Open " . timeToHumanString($res->opendate($part));
280: }
281: if ($status == $res->OPEN) {
282: if ($res->duedate($part)) {
283: return "Due " . timeToHumanString($res->duedate($part));
284: } else {
285: return "Open, no due date";
286: }
287: }
288: if ($status == $res->PAST_DUE_ANSWER_LATER) {
289: return "Answer open " . timeToHumanString($res->answerdate($part));
290: }
291: if ($status == $res->PAST_DUE_NO_ANSWER) {
292: return "Was due " . timeToHumanString($res->duedate($part));
293: }
294: if ($status == $res->ANSWER_OPEN) {
295: return "Answer available";
296: }
297: if ($status == $res->EXCUSED) {
298: return "Excused by instructor";
299: }
300: if ($status == $res->ATTEMPTED) {
301: return "Not yet graded.";
302: }
303: if ($status == $res->TRIES_LEFT) {
304: my $tries = $res->tries($part);
305: my $maxtries = $res->maxtries($part);
306: my $triesString = "";
307: if ($tries && $maxtries) {
308: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
309: if ($maxtries > 1 && $maxtries - $tries == 1) {
310: $triesString = "<b>$triesString</b>";
311: }
312: }
313: if ($res->duedate()) {
314: return "Due " . timeToHumanString($res->duedate($part)) .
315: " $triesString";
316: } else {
317: return "No due date $triesString";
318: }
319: }
320: }
321:
322: # Convenience function, so others can use it: Is the problem due in less then
323: # 24 hours, and still can be done?
324:
325: sub dueInLessThen24Hours {
326: my $res = shift;
327: my $part = shift;
328: my $status = $res->status($part);
329:
330: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
331: $status == $res->TRIES_LEFT()) &&
332: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
333: $res->duedate() > time();
334: }
335:
336: # Convenience function, so others can use it: Is there only one try remaining for the
337: # part, with more then one try to begin with, not due yet and still can be done?
338: sub lastTry {
339: my $res = shift;
340: my $part = shift;
341:
342: my $tries = $res->tries($part);
343: my $maxtries = $res->maxtries($part);
344: return $tries && $maxtries && $maxtries > 1 &&
345: $maxtries - $tries == 1 && $res->duedate() &&
346: $res->duedate() > time();
347: }
348:
349: # This puts a human-readable name on the ENV variable.
350:
351: sub advancedUser {
352: return $ENV{'request.role.adv'};
353: }
354:
355:
356: # timeToHumanString takes a time number and converts it to a
357: # human-readable representation, meant to be used in the following
358: # manner:
359: # print "Due $timestring"
360: # print "Open $timestring"
361: # print "Answer available $timestring"
362: # Very, very, very, VERY English-only... goodness help a localizer on
363: # this func...
364: sub timeToHumanString {
365: my ($time) = @_;
366: # zero, '0' and blank are bad times
367: if (!$time) {
368: return 'never';
369: }
370:
371: my $now = time();
372:
373: my @time = localtime($time);
374: my @now = localtime($now);
375:
376: # Positive = future
377: my $delta = $time - $now;
378:
379: my $minute = 60;
380: my $hour = 60 * $minute;
381: my $day = 24 * $hour;
382: my $week = 7 * $day;
383: my $inPast = 0;
384:
385: # Logic in comments:
386: # Is it now? (extremely unlikely)
387: if ( $delta == 0 ) {
388: return "this instant";
389: }
390:
391: if ($delta < 0) {
392: $inPast = 1;
393: $delta = -$delta;
394: }
395:
396: if ( $delta > 0 ) {
397:
398: my $tense = $inPast ? " ago" : "";
399: my $prefix = $inPast ? "" : "in ";
400:
401: # Less then a minute
402: if ( $delta < $minute ) {
403: if ($delta == 1) { return "${prefix}1 second$tense"; }
404: return "$prefix$delta seconds$tense";
405: }
406:
407: # Less then an hour
408: if ( $delta < $hour ) {
409: # If so, use minutes
410: my $minutes = floor($delta / 60);
411: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
412: return "$prefix$minutes minutes$tense";
413: }
414:
415: # Is it less then 24 hours away? If so,
416: # display hours + minutes
417: if ( $delta < $hour * 24) {
418: my $hours = floor($delta / $hour);
419: my $minutes = floor(($delta % $hour) / $minute);
420: my $hourString = "$hours hours";
421: my $minuteString = ", $minutes minutes";
422: if ($hours == 1) {
423: $hourString = "1 hour";
424: }
425: if ($minutes == 1) {
426: $minuteString = ", 1 minute";
427: }
428: if ($minutes == 0) {
429: $minuteString = "";
430: }
431: return "$prefix$hourString$minuteString$tense";
432: }
433:
434: # Less then 5 days away, display day of the week and
435: # HH:MM
436: if ( $delta < $day * 5 ) {
437: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
438: $timeStr =~ s/12:00 am/midnight/;
439: $timeStr =~ s/12:00 pm/noon/;
440: return ($inPast ? "last " : "next ") .
441: $timeStr;
442: }
443:
444: # Is it this year?
445: if ( $time[5] == $now[5]) {
446: # Return on Month Day, HH:MM meridian
447: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
448: $timeStr =~ s/12:00 am/midnight/;
449: $timeStr =~ s/12:00 pm/noon/;
450: return $timeStr;
451: }
452:
453: # Not this year, so show the year
454: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
455: $timeStr =~ s/12:00 am/midnight/;
456: $timeStr =~ s/12:00 pm/noon/;
457: return $timeStr;
458: }
459: }
460:
461:
462: =pod
463:
464: =head1 NAME
465:
466: Apache::lonnavmap - Subroutines to handle and render the navigation maps
467:
468: =head1 SYNOPSIS
469:
470: The main handler generates the navigational listing for the course,
471: the other objects export this information in a usable fashion for
472: other modules
473:
474: =head1 Object: render
475:
476: The navmap renderer package provides a sophisticated rendering of the
477: standard navigation maps interface into HTML. The provided nav map
478: handler is actually just a glorified call to this.
479:
480: Because of the large number of parameters this function presents,
481: instead of passing it arguments as is normal, pass it in an anonymous
482: hash with the given options. This is because there is no obvious order
483: you may wish to override these in and a hash is easier to read and
484: understand then "undef, undef, undef, 1, undef, undef, renderButton,
485: undef, 0" when you mostly want default behaviors.
486:
487: The package provides a function called 'render', called as
488: Apache::lonnavmaps::renderer->render({}).
489:
490: =head2 Overview of Columns
491:
492: The renderer will build an HTML table for the navmap and return
493: it. The table is consists of several columns, and a row for each
494: resource (or possibly each part). You tell the renderer how many
495: columns to create and what to place in each column, optionally using
496: one or more of the preparent columns, and the renderer will assemble
497: the table.
498:
499: Any additional generally useful column types should be placed in the
500: renderer code here, so anybody can use it anywhere else. Any code
501: specific to the current application (such as the addition of <input>
502: elements in a column) should be placed in the code of the thing using
503: the renderer.
504:
505: At the core of the renderer is the array reference COLS (see Example
506: section below for how to pass this correctly). The COLS array will
507: consist of entries of one of two types of things: Either an integer
508: representing one of the pre-packaged column types, or a sub reference
509: that takes a resource reference, a part number, and a reference to the
510: argument hash passed to the renderer, and returns a string that will
511: be inserted into the HTML representation as it.
512:
513: The pre-packaged column names are refered to by constants in the
514: Apache::lonnavmaps::renderer namespace. The following currently exist:
515:
516: =over 4
517:
518: =item * B<resource>:
519:
520: The general info about the resource: Link, icon for the type, etc. The
521: first column in the standard nav map display. This column also accepts
522: the following parameter in the renderer hash:
523:
524: =over 4
525:
526: =item * B<resource_nolink>:
527:
528: If true, the resource will not be linked. Default: false, resource
529: will have links.
530:
531: =item * B<resource_part_count>:
532:
533: If true (default), the resource will show a part count if the full
534: part list is not displayed. If false, the resource will never show a
535: part count.
536:
537: =item * B<resource_no_folder_link>:
538:
539: If true, the resource's folder will not be clickable to open or close
540: it. Default is false. True implies printCloseAll is false, since you
541: can't close or open folders when this is on anyhow.
542:
543: =back
544:
545: =item B<communication_status>:
546:
547: Whether there is discussion on the resource, email for the user, or
548: (lumped in here) perl errors in the execution of the problem. This is
549: the second column in the main nav map.
550:
551: =item B<quick_status>:
552:
553: An icon for the status of a problem, with four possible states:
554: Correct, incorrect, open, or none (not open yet, not a problem). The
555: third column of the standard navmap.
556:
557: =item B<long_status>:
558:
559: A text readout of the details of the current status of the problem,
560: such as "Due in 22 hours". The fourth column of the standard navmap.
561:
562: =back
563:
564: If you add any others please be sure to document them here.
565:
566: An example of a column renderer that will show the ID number of a
567: resource, along with the part name if any:
568:
569: sub {
570: my ($resource, $part, $params) = @_;
571: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
572: return '<td>' . $resource->{ID} . '</td>';
573: }
574:
575: Note these functions are responsible for the TD tags, which allow them
576: to override vertical and horizontal alignment, etc.
577:
578: =head2 Parameters
579:
580: Most of these parameters are only useful if you are *not* using the
581: folder interface (i.e., the default first column), which is probably
582: the common case. If you are using this interface, then you should be
583: able to get away with just using 'cols' (to specify the columns
584: shown), 'url' (necessary for the folders to link to the current screen
585: correctly), and possibly 'queryString' if your app calls for it. In
586: that case, maintaining the state of the folders will be done
587: automatically.
588:
589: =over 4
590:
591: =item * B<iterator>:
592:
593: A reference to a fresh ::iterator to use from the navmaps. The
594: rendering will reflect the options passed to the iterator, so you can
595: use that to just render a certain part of the course, if you like. If
596: one is not passed, the renderer will attempt to construct one from
597: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
598: 'iterator_map' parameter if any.
599:
600: =item * B<iterator_map>:
601:
602: If you are letting the renderer do the iterator handling, you can
603: instruct the renderer to render only a particular map by passing it
604: the source of the map you want to process, like
605: '/res/103/jerf/navmap.course.sequence'.
606:
607: =item * B<navmap>:
608:
609: A reference to a navmap, used only if an iterator is not passed in. If
610: this is necessary to make an iterator but it is not passed in, a new
611: one will be constructed based on ENV info. This is useful to do basic
612: error checking before passing it off to render.
613:
614: =item * B<r>:
615:
616: The standard Apache response object. This must be passed to the
617: renderer or the course hash will be locked.
618:
619: =item * B<cols>:
620:
621: An array reference
622:
623: =item * B<showParts>:
624:
625: A flag. If yes (default), a line for the resource itself, and a line
626: for each part will be displayed. If not, only one line for each
627: resource will be displayed.
628:
629: =item * B<condenseParts>:
630:
631: A flag. If yes (default), if all parts of the problem have the same
632: status and that status is Nothing Set, Correct, or Network Failure,
633: then only one line will be displayed for that resource anyhow. If no,
634: all parts will always be displayed. If showParts is 0, this is
635: ignored.
636:
637: =item * B<jumpCount>:
638:
639: A string identifying the URL to place the anchor 'curloc' at. Default
640: to no anchor at all. It is the responsibility of the renderer user to
641: ensure that the #curloc is in the URL. By default, determined through
642: the use of the ENV{} 'jump' information, and should normally "just
643: work" correctly.
644:
645: =item * B<here>:
646:
647: A Symb identifying where to place the 'here' marker. Default empty,
648: which means no marker.
649:
650: =item * B<indentString>:
651:
652: A string identifying the indentation string to use. By default, this
653: is a 25 pixel whitespace image with no alt text.
654:
655: =item * B<queryString>:
656:
657: A string which will be prepended to the query string used when the
658: folders are opened or closed.
659:
660: =item * B<url>:
661:
662: The url the folders will link to, which should be the current
663: page. Required if the resource info column is shown.
664:
665: =item * B<currentJumpIndex>:
666:
667: Describes the currently-open row number to cause the browser to jump
668: to, because the user just opened that folder. By default, pulled from
669: the Jump information in the ENV{'form.*'}.
670:
671: =item * B<printKey>:
672:
673: If true, print the key that appears on the top of the standard
674: navmaps. Default is false.
675:
676: =item * B<printCloseAll>:
677:
678: If true, print the "Close all folders" or "open all folders"
679: links. Default is true.
680:
681: =item * B<filterFunc>:
682:
683: A function that takes the resource object as its only parameter and
684: returns a true or false value. If true, the resource is displayed. If
685: false, it is simply skipped in the display. By default, all resources
686: are shown.
687:
688: =item * B<suppressNavmaps>:
689:
690: If true, will not display Navigate Content resources. Default to
691: false.
692:
693: =back
694:
695: =head2 Additional Info
696:
697: In addition to the parameters you can pass to the renderer, which will
698: be passed through unchange to the column renderers, the renderer will
699: generate the following information which your renderer may find
700: useful:
701:
702: If you want to know how many rows were printed, the 'counter' element
703: of the hash passed into the render function will contain the
704: count. You may want to check whether any resources were printed at
705: all.
706:
707: =over 4
708:
709: =back
710:
711: =cut
712:
713: sub resource { return 0; }
714: sub communication_status { return 1; }
715: sub quick_status { return 2; }
716: sub long_status { return 3; }
717:
718: # Data for render_resource
719:
720: sub render_resource {
721: my ($resource, $part, $params) = @_;
722:
723: my $nonLinkedText = ''; # stuff after resource title not in link
724:
725: my $link = $params->{"resourceLink"};
726: my $src = $resource->src();
727: my $it = $params->{"iterator"};
728: my $filter = $it->{FILTER};
729:
730: my $title = $resource->compTitle();
731: if ($src =~ /^\/uploaded\//) {
732: $nonLinkedText=$title;
733: $title = '';
734: }
735: my $partLabel = "";
736: my $newBranchText = "";
737:
738: # If this is a new branch, label it so
739: if ($params->{'isNewBranch'}) {
740: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
741: }
742:
743: # links to open and close the folder
744: my $linkopen = "<a href='$link'>";
745: my $linkclose = "</a>";
746:
747: # Default icon: HTML page
748: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
749:
750: if ($resource->is_problem()) {
751: if ($part eq "" || $params->{'condensed'}) {
752: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
753: } else {
754: $icon = $params->{'indentString'};
755: }
756: }
757:
758: # Display the correct map icon to open or shut map
759: if ($resource->is_map()) {
760: my $mapId = $resource->map_pc();
761: my $nowOpen = !defined($filter->{$mapId});
762: if ($it->{CONDITION}) {
763: $nowOpen = !$nowOpen;
764: }
765:
766: if (!$params->{'resource_no_folder_link'}) {
767: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
768: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
769:
770: $linkopen = "<a href='" . $params->{'url'} . '?' .
771: $params->{'queryString'} . '&filter=';
772: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
773: addToFilter($filter, $mapId) :
774: removeFromFilter($filter, $mapId);
775: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
776: . $params->{'hereType'} . '&here=' .
777: &Apache::lonnet::escape($params->{'here'}) .
778: '&jump=' .
779: &Apache::lonnet::escape($resource->symb()) .
780: "&folderManip=1'>";
781: } else {
782: # Don't allow users to manipulate folder
783: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') .
784: '.nomanip.gif';
785: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
786:
787: $linkopen = "";
788: $linkclose = "";
789: }
790: }
791:
792: if ($resource->randomout()) {
793: $nonLinkedText .= ' <i>(hidden)</i> ';
794: }
795:
796: # We're done preparing and finally ready to start the rendering
797: my $result = "<td align='left' valign='center'>";
798:
799: my $indentLevel = $params->{'indentLevel'};
800: if ($newBranchText) { $indentLevel--; }
801:
802: # print indentation
803: for (my $i = 0; $i < $indentLevel; $i++) {
804: $result .= $params->{'indentString'};
805: }
806:
807: # Decide what to display
808: $result .= "$newBranchText$linkopen$icon$linkclose";
809:
810: my $curMarkerBegin = '';
811: my $curMarkerEnd = '';
812:
813: # Is this the current resource?
814: if (!$params->{'displayedHereMarker'} &&
815: $resource->symb() eq $params->{'here'} ) {
816: $curMarkerBegin = '<font color="red" size="+2">> </font>';
817: $curMarkerEnd = '<font color="red" size="+2"><</font>';
818: $params->{'displayedHereMarker'} = 1;
819: }
820:
821: if ($resource->is_problem() && $part ne "" &&
822: !$params->{'condensed'}) {
823: $partLabel = " (Part $part)";
824: $title = "";
825: }
826:
827: if ($params->{'condensed'} && $resource->countParts() > 1) {
828: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
829: }
830:
831: if (!$params->{'resource_nolink'}) {
832: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
833: } else {
834: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
835: }
836:
837: return $result;
838: }
839:
840: sub render_communication_status {
841: my ($resource, $part, $params) = @_;
842: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
843:
844: my $link = $params->{"resourceLink"};
845: my $linkopen = "<a href='$link'>";
846: my $linkclose = "</a>";
847:
848: if ($resource->hasDiscussion()) {
849: $discussionHTML = $linkopen .
850: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
851: $linkclose;
852: }
853:
854: if ($resource->getFeedback()) {
855: my $feedback = $resource->getFeedback();
856: foreach (split(/\,/, $feedback)) {
857: if ($_) {
858: $feedbackHTML .= ' <a href="/adm/email?display='
859: . &Apache::lonnet::escape($_) . '">'
860: . '<img src="/adm/lonMisc/feedback.gif" '
861: . 'border="0" /></a>';
862: }
863: }
864: }
865:
866: if ($resource->getErrors()) {
867: my $errors = $resource->getErrors();
868: foreach (split(/,/, $errors)) {
869: if ($_) {
870: $errorHTML .= ' <a href="/adm/email?display='
871: . &Apache::lonnet::escape($_) . '">'
872: . '<img src="/adm/lonMisc/bomb.gif" '
873: . 'border="0" /></a>';
874: }
875: }
876: }
877:
878: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
879:
880: }
881: sub render_quick_status {
882: my ($resource, $part, $params) = @_;
883: my $result = "";
884: my $firstDisplayed = !$params->{'condensed'} &&
885: $params->{'multipart'} && $part eq "0";
886:
887: my $link = $params->{"resourceLink"};
888: my $linkopen = "<a href='$link'>";
889: my $linkclose = "</a>";
890:
891: if ($resource->is_problem() &&
892: !$firstDisplayed) {
893: my $icon = $statusIconMap{$resource->status($part)};
894: my $alt = $iconAltTags{$icon};
895: if ($icon) {
896: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
897: } else {
898: $result .= "<td width='30'> </td>\n";
899: }
900: } else { # not problem, no icon
901: $result .= "<td width='30'> </td>\n";
902: }
903:
904: return $result;
905: }
906: sub render_long_status {
907: my ($resource, $part, $params) = @_;
908: my $result = "<td align='right' valign='center'>\n";
909: my $firstDisplayed = !$params->{'condensed'} &&
910: $params->{'multipart'} && $part eq "0";
911:
912: my $color;
913: if ($resource->is_problem()) {
914: $color = $colormap{$resource->status};
915:
916: if (dueInLessThen24Hours($resource, $part) ||
917: lastTry($resource, $part)) {
918: $color = $hurryUpColor;
919: }
920: }
921:
922: if ($resource->kind() eq "res" &&
923: $resource->is_problem() &&
924: !$firstDisplayed) {
925: if ($color) {$result .= "<font color=\"$color\"><b>"; }
926: $result .= getDescription($resource, $part);
927: if ($color) {$result .= "</b></font>"; }
928: }
929: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
930: $result .= '(randomly select ' . $resource->randompick() .')';
931: }
932:
933: $result .= " </td>\n";
934:
935: return $result;
936: }
937:
938: my @preparedColumns = (\&render_resource, \&render_communication_status,
939: \&render_quick_status, \&render_long_status);
940:
941: sub setDefault {
942: my ($val, $default) = @_;
943: if (!defined($val)) { return $default; }
944: return $val;
945: }
946:
947: sub render {
948: my $args = shift;
949: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
950: my $result = '';
951:
952: # Configure the renderer.
953: my $cols = $args->{'cols'};
954: if (!defined($cols)) {
955: # no columns, no nav maps.
956: return '';
957: }
958: my $mustCloseNavMap = 0;
959: my $navmap;
960: if (defined($args->{'navmap'})) {
961: $navmap = $args->{'navmap'};
962: }
963:
964: my $r = $args->{'r'};
965: my $queryString = $args->{'queryString'};
966: my $jump = $args->{'jump'};
967: my $here = $args->{'here'};
968: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
969: my $currentJumpDelta = 2; # change this to change how many resources are displayed
970: # before the current resource when using #current
971:
972: # If we were passed 'here' information, we are not rendering
973: # after a folder manipulation, and we were not passed an
974: # iterator, make sure we open the folders to show the "here"
975: # marker
976: my $filterHash = {};
977: # Figure out what we're not displaying
978: foreach (split(/\,/, $ENV{"form.filter"})) {
979: if ($_) {
980: $filterHash->{$_} = "1";
981: }
982: }
983:
984: my $condition = 0;
985: if ($ENV{'form.condition'}) {
986: $condition = 1;
987: }
988:
989: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
990: # Step 1: Check to see if we have a navmap
991: if (!defined($navmap)) {
992: $navmap = Apache::lonnavmaps::navmap->new(
993: $ENV{"request.course.fn"}.".db",
994: $ENV{"request.course.fn"}."_parms.db", 1, 1);
995: $mustCloseNavMap = 1;
996: }
997: $navmap->init();
998:
999: # Step two: Locate what kind of here marker is necessary
1000: # Determine where the "here" marker is and where the screen jumps to.
1001:
1002: if ($ENV{'form.postsymb'}) {
1003: $here = $jump = $ENV{'form.postsymb'};
1004: } elsif ($ENV{'form.postdata'}) {
1005: # couldn't find a symb, is there a URL?
1006: my $currenturl = $ENV{'form.postdata'};
1007: #$currenturl=~s/^http\:\/\///;
1008: #$currenturl=~s/^[^\/]+//;
1009:
1010: $here = $jump = &Apache::lonnet::symbread($currenturl);
1011: }
1012:
1013: # Step three: Ensure the folders are open
1014: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1015: my $depth = 1;
1016: $mapIterator->next(); # discard the first BEGIN_MAP
1017: my $curRes = $mapIterator->next();
1018: my $found = 0;
1019:
1020: # We only need to do this if we need to open the maps to show the
1021: # current position. This will change the counter so we can't count
1022: # for the jump marker with this loop.
1023: while ($depth > 0 && !$found) {
1024: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1025: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1026:
1027: if (ref($curRes) && $curRes->symb() eq $here) {
1028: my $mapStack = $mapIterator->getStack();
1029:
1030: # Ensure the parent maps are open
1031: for my $map (@{$mapStack}) {
1032: if ($condition) {
1033: undef $filterHash->{$map->map_pc()};
1034: } else {
1035: $filterHash->{$map->map_pc()} = 1;
1036: }
1037: }
1038: $found = 1;
1039: }
1040:
1041: $curRes = $mapIterator->next();
1042: }
1043: }
1044:
1045: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1046: # If this is a click on a folder or something, we want to preserve the "here"
1047: # from the querystring, and get the new "jump" marker
1048: $here = $ENV{'form.here'};
1049: $jump = $ENV{'form.jump'};
1050: }
1051:
1052: my $it = $args->{'iterator'};
1053: if (!defined($it)) {
1054: # Construct a default iterator based on $ENV{'form.'} information
1055:
1056: # Step 1: Check to see if we have a navmap
1057: if (!defined($navmap)) {
1058: $navmap = Apache::lonnavmaps::navmap->new($r,
1059: $ENV{"request.course.fn"}.".db",
1060: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1061: $mustCloseNavMap = 1;
1062: }
1063: # Paranoia: Make sure it's ready
1064: $navmap->init();
1065:
1066: # See if we're being passed a specific map
1067: if ($args->{'iterator_map'}) {
1068: my $map = $args->{'iterator_map'};
1069: $map = $navmap->getResourceByUrl($map);
1070: my $firstResource = $map->map_start();
1071: my $finishResource = $map->map_finish();
1072:
1073: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1074: } else {
1075: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1076: }
1077: }
1078:
1079: # (re-)Locate the jump point, if any
1080: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1081: my $depth = 1;
1082: $mapIterator->next();
1083: my $curRes = $mapIterator->next();
1084: my $foundJump = 0;
1085: my $counter = 0;
1086:
1087: while ($depth > 0 && !$foundJump) {
1088: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1089: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1090: if (ref($curRes)) { $counter++; }
1091:
1092: if (ref($curRes) && $jump eq $curRes->symb()) {
1093:
1094: # This is why we have to use the main iterator instead of the
1095: # potentially faster DFS: The count has to be the same, so
1096: # the order has to be the same, which DFS won't give us.
1097: $args->{'currentJumpIndex'} = $counter;
1098: $foundJump = 1;
1099: }
1100:
1101: $curRes = $mapIterator->next();
1102: }
1103:
1104: my $showParts = setDefault($args->{'showParts'}, 1);
1105: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1106: # keeps track of when the current resource is found,
1107: # so we can back up a few and put the anchor above the
1108: # current resource
1109: my $printKey = $args->{'printKey'};
1110: my $printCloseAll = $args->{'printCloseAll'};
1111: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1112: my $filterFunc = setDefault($args->{'filterFunc'},
1113: sub {return 1;});
1114:
1115: # Print key?
1116: if ($printKey) {
1117: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1118: my $date=localtime;
1119: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1120: if ($navmap->{LAST_CHECK}) {
1121: $result .=
1122: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1123: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1124: '</td><td align="center" valign="bottom"> '.
1125: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
1126: '</td>';
1127: } else {
1128: $result .= '<td align="center" valign="bottom"> '.
1129: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
1130: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
1131: '</td>';
1132: }
1133:
1134: $result .= '</tr></table>';
1135: }
1136:
1137: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1138: if ($condition) {
1139: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1140: "&here=" . Apache::lonnet::escape($here) .
1141: "\">Close All Folders</a>";
1142: } else {
1143: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1144: "&here=" . Apache::lonnet::escape($here) .
1145: "\">Open All Folders</a>";
1146: }
1147: $result .= "<br /><br />\n";
1148: }
1149:
1150: if ($r) {
1151: $r->print($result);
1152: $r->rflush();
1153: $result = "";
1154: }
1155: # End parameter setting
1156:
1157: # Data
1158: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1159: my $res = "Apache::lonnavmaps::resource";
1160: my %condenseStatuses =
1161: ( $res->NETWORK_FAILURE => 1,
1162: $res->NOTHING_SET => 1,
1163: $res->CORRECT => 1 );
1164: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1165:
1166: # Shared variables
1167: $args->{'counter'} = 0; # counts the rows
1168: $args->{'indentLevel'} = 0;
1169: $args->{'isNewBranch'} = 0;
1170: $args->{'condensed'} = 0;
1171: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1172: $args->{'displayedHereMarker'} = 0;
1173:
1174: my $displayedJumpMarker = 0;
1175: # Set up iteration.
1176: $depth = 1;
1177: $it->next(); # discard initial BEGIN_MAP
1178: $curRes = $it->next();
1179: my $now = time();
1180: my $in24Hours = $now + 24 * 60 * 60;
1181: my $rownum = 0;
1182:
1183: # export "here" marker information
1184: $args->{'here'} = $here;
1185:
1186: while ($depth > 0) {
1187: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1188: if ($curRes == $it->END_MAP()) { $depth--; }
1189:
1190: # Maintain indentation level.
1191: if ($curRes == $it->BEGIN_MAP() ||
1192: $curRes == $it->BEGIN_BRANCH() ) {
1193: $args->{'indentLevel'}++;
1194: }
1195: if ($curRes == $it->END_MAP() ||
1196: $curRes == $it->END_BRANCH() ) {
1197: $args->{'indentLevel'}--;
1198: }
1199: # Notice new branches
1200: if ($curRes == $it->BEGIN_BRANCH()) {
1201: $args->{'isNewBranch'} = 1;
1202: }
1203:
1204: # If this isn't an actual resource, continue on
1205: if (!ref($curRes)) {
1206: next;
1207: }
1208:
1209: $args->{'counter'}++;
1210:
1211: # If this has been filtered out, continue on
1212: if (!(&$filterFunc($curRes))) {
1213: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1214: next;
1215: }
1216:
1217: # If we're suppressing navmaps and this is a navmap, continue on
1218: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1219: next;
1220: }
1221:
1222: # Does it have multiple parts?
1223: $args->{'multipart'} = 0;
1224: $args->{'condensed'} = 0;
1225: my @parts;
1226:
1227: # Decide what parts to show.
1228: if ($curRes->is_problem() && $showParts) {
1229: $curRes->parts();
1230: $curRes->parts();
1231: @parts = @{$curRes->parts()};
1232: $args->{'multipart'} = scalar(@parts) > 1;
1233:
1234: if ($condenseParts) { # do the condensation
1235: if (!$curRes->opendate("0")) {
1236: @parts = ();
1237: $args->{'condensed'} = 1;
1238: }
1239: if (!$args->{'condensed'}) {
1240: # Decide whether to condense based on similarity
1241: my $status = $curRes->status($parts[1]);
1242: my $due = $curRes->duedate($parts[1]);
1243: my $open = $curRes->opendate($parts[1]);
1244: my $statusAllSame = 1;
1245: my $dueAllSame = 1;
1246: my $openAllSame = 1;
1247: for (my $i = 2; $i < scalar(@parts); $i++) {
1248: if ($curRes->status($parts[$i]) != $status){
1249: $statusAllSame = 0;
1250: }
1251: if ($curRes->duedate($parts[$i]) != $due ) {
1252: $dueAllSame = 0;
1253: }
1254: if ($curRes->opendate($parts[$i]) != $open) {
1255: $openAllSame = 0;
1256: }
1257: }
1258: # $*allSame is true if all the statuses were
1259: # the same. Now, if they are all the same and
1260: # match one of the statuses to condense, or they
1261: # are all open with the same due date, or they are
1262: # all OPEN_LATER with the same open date, display the
1263: # status of the first non-zero part (to get the 'correct'
1264: # status right, since 0 is never 'correct' or 'open').
1265: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1266: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1267: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1268: @parts = ();
1269: $args->{'condensed'} = 1;
1270: }
1271:
1272: }
1273: }
1274: }
1275:
1276: # If the multipart problem was condensed, "forget" it was multipart
1277: if (scalar(@parts) == 1) {
1278: $args->{'multipart'} = 0;
1279: }
1280:
1281: # Now, we've decided what parts to show. Loop through them and
1282: # show them.
1283: foreach my $part ('', @parts) {
1284: if ($part eq '0') {
1285: next;
1286: }
1287: $rownum ++;
1288: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1289:
1290: $result .= " <tr bgcolor='$backgroundColor'>\n";
1291:
1292: # Set up some data about the parts that the cols might want
1293: my $filter = $it->{FILTER};
1294: my $stack = $it->getStack();
1295: my $src = getLinkForResource($stack);
1296:
1297: my $srcHasQuestion = $src =~ /\?/;
1298: $args->{"resourceLink"} = $src.
1299: ($srcHasQuestion?'&':'?') .
1300: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1301:
1302: # Now, display each column.
1303: foreach my $col (@$cols) {
1304: my $colHTML = '';
1305: if (ref($col)) {
1306: $colHTML .= &$col($curRes, $part, $args);
1307: } else {
1308: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1309: }
1310:
1311: # If this is the first column and it's time to print
1312: # the anchor, do so
1313: if ($col == $cols->[0] &&
1314: $args->{'counter'} == $args->{'currentJumpIndex'} -
1315: $currentJumpDelta) {
1316: # Jam the anchor after the <td> tag;
1317: # necessary for valid HTML (which Mozilla requires)
1318: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1319: $displayedJumpMarker = 1;
1320: }
1321: $result .= $colHTML . "\n";
1322: }
1323: $result .= " </tr>\n";
1324: $args->{'isNewBranch'} = 0;
1325: }
1326:
1327: if ($r && $rownum % 20 == 0) {
1328: $r->print($result);
1329: $result = "";
1330: $r->rflush();
1331: }
1332: } continue {
1333: $curRes = $it->next();
1334: }
1335:
1336: # Print out the part that jumps to #curloc if it exists
1337: # delay needed because the browser is processing the jump before
1338: # it finishes rendering, so it goes to the wrong place!
1339: # onload might be better, but this routine has no access to that.
1340: # On mozilla, the 0-millisecond timeout seems to prevent this;
1341: # it's quite likely this might fix other browsers, too, and
1342: # certainly won't hurt anything.
1343: if ($displayedJumpMarker) {
1344: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1345: }
1346:
1347: $result .= "</table>";
1348:
1349: if ($r) {
1350: $r->print($result);
1351: $result = "";
1352: $r->rflush();
1353: }
1354:
1355: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1356:
1357: return $result;
1358: }
1359:
1360: 1;
1361:
1362: package Apache::lonnavmaps::navmap;
1363:
1364: =pod
1365:
1366: lonnavmaps provides functions and objects for dealing with the
1367: compiled course hashes generated when a user enters the course, the
1368: Apache handler for the "Navigation Map" button, and a flexible
1369: prepared renderer for navigation maps that are easy to use anywhere.
1370:
1371: =head1 Object: navmap
1372:
1373: Encapsulating the compiled nav map
1374:
1375: navmap is an object that encapsulates a compiled course map and
1376: provides a reasonable interface to it.
1377:
1378: Most notably it provides a way to navigate the map sensibly and a
1379: flexible iterator that makes it easy to write various renderers based
1380: on nav maps.
1381:
1382: You must obtain resource objects through the navmap object.
1383:
1384: =head2 Methods
1385:
1386: =over 4
1387:
1388: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
1389: genMailDiscussStatus):
1390:
1391: Binds a new navmap object to the compiled nav map hash and parm hash
1392: given as filenames. genCourseAndUserOptions is a flag saying whether
1393: the course options and user options hash should be generated. This is
1394: for when you are using the parameters of the resources that require
1395: them; see documentation in resource object
1396: documentation. genMailDiscussStatus causes the nav map to retreive
1397: information about the email and discussion status of
1398: resources. Returns the navmap object if this is successful, or
1399: B<undef> if not. You must check for undef; errors will occur when you
1400: try to use the other methods otherwise.
1401:
1402: =item * B<getIterator>(first, finish, filter, condition):
1403:
1404: See iterator documentation below.
1405:
1406: =cut
1407:
1408: use strict;
1409: use GDBM_File;
1410:
1411: sub new {
1412: # magic invocation to create a class instance
1413: my $proto = shift;
1414: my $class = ref($proto) || $proto;
1415: my $self = {};
1416:
1417: $self->{NAV_HASH_FILE} = shift;
1418: $self->{PARM_HASH_FILE} = shift;
1419: $self->{GENERATE_COURSE_USER_OPT} = shift;
1420: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1421:
1422: # Resource cache stores navmap resources as we reference them. We generate
1423: # them on-demand so we don't pay for creating resources unless we use them.
1424: $self->{RESOURCE_CACHE} = {};
1425:
1426: # Network failure flag, if we accessed the course or user opt and
1427: # failed
1428: $self->{NETWORK_FAILURE} = 0;
1429:
1430: # tie the nav hash
1431:
1432: my %navmaphash;
1433: my %parmhash;
1434: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1435: &GDBM_READER(), 0640))) {
1436: return undef;
1437: }
1438:
1439: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1440: &GDBM_READER(), 0640)))
1441: {
1442: untie %{$self->{PARM_HASH}};
1443: return undef;
1444: }
1445:
1446: $self->{NAV_HASH} = \%navmaphash;
1447: $self->{PARM_HASH} = \%parmhash;
1448: $self->{INITED} = 0;
1449:
1450: bless($self);
1451:
1452: return $self;
1453: }
1454:
1455: sub init {
1456: my $self = shift;
1457: if ($self->{INITED}) { return; }
1458:
1459: # If the course opt hash and the user opt hash should be generated,
1460: # generate them
1461: if ($self->{GENERATE_COURSE_USER_OPT}) {
1462: my $uname=$ENV{'user.name'};
1463: my $udom=$ENV{'user.domain'};
1464: my $uhome=$ENV{'user.home'};
1465: my $cid=$ENV{'request.course.id'};
1466: my $chome=$ENV{'course.'.$cid.'.home'};
1467: my ($cdom,$cnum)=split(/\_/,$cid);
1468:
1469: my $userprefix=$uname.'_'.$udom.'_';
1470:
1471: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1472: unless ($uhome eq 'no_host') {
1473: # ------------------------------------------------- Get coursedata (if present)
1474: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1475: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1476: ':resourcedata',$chome);
1477: if ($reply!~/^error\:/) {
1478: $courserdatas{$cid}=$reply;
1479: $courserdatas{$cid.'.last_cache'}=time;
1480: }
1481: # check to see if network failed
1482: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1483: {
1484: $self->{NETWORK_FAILURE} = 1;
1485: }
1486: }
1487: foreach (split(/\&/,$courserdatas{$cid})) {
1488: my ($name,$value)=split(/\=/,$_);
1489: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1490: &Apache::lonnet::unescape($value);
1491: }
1492: # --------------------------------------------------- Get userdata (if present)
1493: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1494: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1495: if ($reply!~/^error\:/) {
1496: $userrdatas{$uname.'___'.$udom}=$reply;
1497: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1498: }
1499: # check to see if network failed
1500: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1501: {
1502: $self->{NETWORK_FAILURE} = 1;
1503: }
1504: }
1505: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1506: my ($name,$value)=split(/\=/,$_);
1507: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1508: &Apache::lonnet::unescape($value);
1509: }
1510: $self->{COURSE_OPT} = \%courseopt;
1511: $self->{USER_OPT} = \%useropt;
1512: }
1513: }
1514:
1515: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1516: my $cid=$ENV{'request.course.id'};
1517: my ($cdom,$cnum)=split(/\_/,$cid);
1518:
1519: my %emailstatus = &Apache::lonnet::dump('email_status');
1520: my $logoutTime = $emailstatus{'logout'};
1521: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1522: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1523: $courseLeaveTime : $logoutTime);
1524: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1525: $cdom, $cnum);
1526: my %feedback=();
1527: my %error=();
1528: my $keys = &Apache::lonnet::reply('keys:'.
1529: $ENV{'user.domain'}.':'.
1530: $ENV{'user.name'}.':nohist_email',
1531: $ENV{'user.home'});
1532:
1533: foreach my $msgid (split(/\&/, $keys)) {
1534: $msgid=&Apache::lonnet::unescape($msgid);
1535: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1536: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1537: my ($what,$url)=($1,$2);
1538: my %status=
1539: &Apache::lonnet::get('email_status',[$msgid]);
1540: if ($status{$msgid}=~/^error\:/) {
1541: $status{$msgid}='';
1542: }
1543:
1544: if (($status{$msgid} eq 'new') ||
1545: (!$status{$msgid})) {
1546: if ($what eq 'Error') {
1547: $error{$url}.=','.$msgid;
1548: } else {
1549: $feedback{$url}.=','.$msgid;
1550: }
1551: }
1552: }
1553: }
1554:
1555: $self->{FEEDBACK} = \%feedback;
1556: $self->{ERROR_MSG} = \%error; # what is this? JB
1557: $self->{DISCUSSION_TIME} = \%discussiontime;
1558: $self->{EMAIL_STATUS} = \%emailstatus;
1559:
1560: }
1561:
1562: $self->{PARM_CACHE} = {};
1563: $self->{INITED} = 1;
1564: }
1565:
1566: # Internal function: Takes a key to look up in the nav hash and implements internal
1567: # memory caching of that key.
1568: sub navhash {
1569: my $self = shift; my $key = shift;
1570: return $self->{NAV_HASH}->{$key};
1571: }
1572:
1573: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1574: sub courseMapDefined {
1575: my $self = shift;
1576: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1577:
1578: my $firstres = $self->navhash("map_start_$uri");
1579: my $lastres = $self->navhash("map_finish_$uri");
1580: return $firstres && $lastres;
1581: }
1582:
1583: sub getIterator {
1584: my $self = shift;
1585: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1586: shift, undef, shift);
1587: return $iterator;
1588: }
1589:
1590: # unties the hash when done
1591: sub untieHashes {
1592: my $self = shift;
1593: untie %{$self->{NAV_HASH}};
1594: untie %{$self->{PARM_HASH}};
1595: }
1596:
1597: # Private method: Does the given resource (as a symb string) have
1598: # current discussion? Returns 0 if chat/mail data not extracted.
1599: sub hasDiscussion {
1600: my $self = shift;
1601: my $symb = shift;
1602: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1603:
1604: #return defined($self->{DISCUSSION_TIME}->{$symb});
1605: return $self->{DISCUSSION_TIME}->{$symb} >
1606: $self->{LAST_CHECK};
1607: }
1608:
1609: # Private method: Does the given resource (as a symb string) have
1610: # current feedback? Returns the string in the feedback hash, which
1611: # will be false if it does not exist.
1612: sub getFeedback {
1613: my $self = shift;
1614: my $symb = shift;
1615:
1616: if (!defined($self->{FEEDBACK})) { return ""; }
1617:
1618: return $self->{FEEDBACK}->{$symb};
1619: }
1620:
1621: # Private method: Get the errors for that resource (by source).
1622: sub getErrors {
1623: my $self = shift;
1624: my $src = shift;
1625:
1626: if (!defined($self->{ERROR_MSG})) { return ""; }
1627: return $self->{ERROR_MSG}->{$src};
1628: }
1629:
1630: =pod
1631:
1632: =item * B<getById>(id):
1633:
1634: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1635: object for that resource. This method, or other methods that use it
1636: (as in the resource object) is the only proper way to obtain a
1637: resource object.
1638:
1639: =cut
1640:
1641: # The strategy here is to cache the resource objects, and only construct them
1642: # as we use them. The real point is to prevent reading any more from the tied
1643: # hash then we have to, which should hopefully alleviate speed problems.
1644: # Caching is just an incidental detail I throw in because it makes sense.
1645:
1646: sub getById {
1647: my $self = shift;
1648: my $id = shift;
1649:
1650: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1651: {
1652: return $self->{RESOURCE_CACHE}->{$id};
1653: }
1654:
1655: # resource handles inserting itself into cache.
1656: # Not clear why the quotes are necessary, but as of this
1657: # writing it doesn't work without them.
1658: return "Apache::lonnavmaps::resource"->new($self, $id);
1659: }
1660:
1661: sub getBySymb {
1662: my $self = shift;
1663: my $symb = shift;
1664: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1665: my $map = $self->getResourceByUrl($mapUrl);
1666: return $self->getById($map->map_pc() . '.' . $id);
1667: }
1668:
1669: =pod
1670:
1671: =item * B<firstResource>():
1672:
1673: Returns a resource object reference corresponding to the first
1674: resource in the navmap.
1675:
1676: =cut
1677:
1678: sub firstResource {
1679: my $self = shift;
1680: my $firstResource = $self->navhash('map_start_' .
1681: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1682: return $self->getById($firstResource);
1683: }
1684:
1685: =pod
1686:
1687: =item * B<finishResource>():
1688:
1689: Returns a resource object reference corresponding to the last resource
1690: in the navmap.
1691:
1692: =cut
1693:
1694: sub finishResource {
1695: my $self = shift;
1696: my $firstResource = $self->navhash('map_finish_' .
1697: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1698: return $self->getById($firstResource);
1699: }
1700:
1701: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1702: # the actual lookup; parmval caches the results.
1703: sub parmval {
1704: my $self = shift;
1705: my ($what,$symb)=@_;
1706: my $hashkey = $what."|||".$symb;
1707:
1708: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1709: return $self->{PARM_CACHE}->{$hashkey};
1710: }
1711:
1712: my $result = $self->parmval_real($what, $symb);
1713: $self->{PARM_CACHE}->{$hashkey} = $result;
1714: return $result;
1715: }
1716:
1717: sub parmval_real {
1718: my $self = shift;
1719: my ($what,$symb) = @_;
1720:
1721: my $cid=$ENV{'request.course.id'};
1722: my $csec=$ENV{'request.course.sec'};
1723: my $uname=$ENV{'user.name'};
1724: my $udom=$ENV{'user.domain'};
1725:
1726: unless ($symb) { return ''; }
1727: my $result='';
1728:
1729: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1730:
1731: # ----------------------------------------------------- Cascading lookup scheme
1732: my $rwhat=$what;
1733: $what=~s/^parameter\_//;
1734: $what=~s/\_/\./;
1735:
1736: my $symbparm=$symb.'.'.$what;
1737: my $mapparm=$mapname.'___(all).'.$what;
1738: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1739:
1740: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1741: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1742: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1743:
1744: my $courselevel= $usercourseprefix.'.'.$what;
1745: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1746: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1747:
1748: my $useropt = $self->{USER_OPT};
1749: my $courseopt = $self->{COURSE_OPT};
1750: my $parmhash = $self->{PARM_HASH};
1751:
1752: # ---------------------------------------------------------- first, check user
1753: if ($uname and defined($useropt)) {
1754: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1755: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1756: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1757: }
1758:
1759: # ------------------------------------------------------- second, check course
1760: if ($csec and defined($courseopt)) {
1761: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1762: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1763: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1764: }
1765:
1766: if (defined($courseopt)) {
1767: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1768: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1769: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1770: }
1771:
1772: # ----------------------------------------------------- third, check map parms
1773:
1774: my $thisparm=$$parmhash{$symbparm};
1775: if (defined($thisparm)) { return $thisparm; }
1776:
1777: # ----------------------------------------------------- fourth , check default
1778:
1779: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1780: if (defined($default)) { return $default}
1781:
1782: # --------------------------------------------------- fifth , cascade up parts
1783:
1784: my ($space,@qualifier)=split(/\./,$rwhat);
1785: my $qualifier=join('.',@qualifier);
1786: unless ($space eq '0') {
1787: my @parts=split(/_/,$space);
1788: my $id=pop(@parts);
1789: my $part=join('_',@parts);
1790: if ($part eq '') { $part='0'; }
1791: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1792: if (defined($partgeneral)) { return $partgeneral; }
1793: }
1794: return '';
1795: }
1796:
1797: =pod
1798:
1799: =item * B<getResourceByUrl>(url):
1800:
1801: Retrieves a resource object by URL of the resource. If passed a
1802: resource object, it will simply return it, so it is safe to use this
1803: method in code like "$res = $navmap->getResourceByUrl($res)", if
1804: you're not sure if $res is already an object, or just a URL. If the
1805: resource appears multiple times in the course, only the first instance
1806: will be returned. As a result, this is probably useful only for maps.
1807:
1808: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
1809:
1810: The map is a specification of a map to retreive the resources from,
1811: either as a url or as an object. The filterFunc is a reference to a
1812: function that takes a resource object as its one argument and returns
1813: true if the resource should be included, or false if it should not
1814: be. If recursive is true, the map will be recursively examined,
1815: otherwise it will not be. If bailout is true, the function will return
1816: as soon as it finds a resource, if false it will finish. By default,
1817: the map is the top-level map of the course, filterFunc is a function
1818: that always returns 1, recursive is true, bailout is false. The
1819: resources will be returned in a list containing the resource objects
1820: for the corresponding resources, with B<no structure information> in
1821: the list; regardless of branching, recursion, etc., it will be a flat
1822: list.
1823:
1824: Thus, this is suitable for cases where you don't want the structure,
1825: just a list of all resources. It is also suitable for finding out how
1826: many resources match a given description; for this use, if all you
1827: want to know is if I<any> resources match the description, the bailout
1828: parameter will allow you to avoid potentially expensive enumeration of
1829: all matching resources.
1830:
1831: =item * B<hasResources>(map, filterFunc, recursive):
1832:
1833: Convience method for
1834:
1835: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
1836:
1837: which will tell whether the map has resources matching the description
1838: in the filter function.
1839:
1840: =cut
1841:
1842: sub getResourceByUrl {
1843: my $self = shift;
1844: my $resUrl = shift;
1845:
1846: if (ref($resUrl)) { return $resUrl; }
1847:
1848: $resUrl = &Apache::lonnet::clutter($resUrl);
1849: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1850: if ($resId =~ /,/) {
1851: $resId = (split (/,/, $resId))[0];
1852: }
1853: if (!$resId) { return ''; }
1854: return $self->getById($resId);
1855: }
1856:
1857: sub retrieveResources {
1858: my $self = shift;
1859: my $map = shift;
1860: my $filterFunc = shift;
1861: if (!defined ($filterFunc)) {
1862: $filterFunc = sub {return 1;};
1863: }
1864: my $recursive = shift;
1865: if (!defined($recursive)) { $recursive = 1; }
1866: my $bailout = shift;
1867: if (!defined($bailout)) { $bailout = 0; }
1868:
1869: # Create the necessary iterator.
1870: if (!ref($map)) { # assume it's a url of a map.
1871: $map = $self->getResourceByUrl($map);
1872: }
1873:
1874: # Check the map's validity.
1875: if (!$map || !$map->is_map()) {
1876: # Oh, to throw an exception.... how I'd love that!
1877: return ();
1878: }
1879:
1880: # Get an iterator.
1881: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1882: !$recursive);
1883:
1884: my @resources = ();
1885:
1886: # Run down the iterator and collect the resources.
1887: my $depth = 1;
1888: $it->next();
1889: my $curRes = $it->next();
1890:
1891: while ($depth > 0) {
1892: if ($curRes == $it->BEGIN_MAP()) {
1893: $depth++;
1894: }
1895: if ($curRes == $it->END_MAP()) {
1896: $depth--;
1897: }
1898:
1899: if (ref($curRes)) {
1900: if (!&$filterFunc($curRes)) {
1901: next;
1902: }
1903:
1904: push @resources, $curRes;
1905:
1906: if ($bailout) {
1907: return @resources;
1908: }
1909: }
1910:
1911: $curRes = $it->next();
1912: }
1913:
1914: return @resources;
1915: }
1916:
1917: sub hasResource {
1918: my $self = shift;
1919: my $map = shift;
1920: my $filterFunc = shift;
1921: my $recursive = shift;
1922:
1923: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1924: }
1925:
1926: 1;
1927:
1928: package Apache::lonnavmaps::iterator;
1929:
1930: =pod
1931:
1932: =back
1933:
1934: =head1 Object: navmap Iterator
1935:
1936: An I<iterator> encapsulates the logic required to traverse a data
1937: structure. navmap uses an iterator to traverse the course map
1938: according to the criteria you wish to use.
1939:
1940: To obtain an iterator, call the B<getIterator>() function of a
1941: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
1942: directly.) This will return a reference to the iterator:
1943:
1944: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1945:
1946: To get the next thing from the iterator, call B<next>:
1947:
1948: C<my $nextThing = $resourceIterator-E<gt>next()>
1949:
1950: getIterator behaves as follows:
1951:
1952: =over 4
1953:
1954: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
1955:
1956: All parameters are optional. firstResource is a resource reference
1957: corresponding to where the iterator should start. It defaults to
1958: navmap->firstResource() for the corresponding nav map. finishResource
1959: corresponds to where you want the iterator to end, defaulting to
1960: navmap->finishResource(). filterHash is a hash used as a set
1961: containing strings representing the resource IDs, defaulting to
1962: empty. Condition is a 1 or 0 that sets what to do with the filter
1963: hash: If a 0, then only resource that exist IN the filterHash will be
1964: recursed on. If it is a 1, only resources NOT in the filterHash will
1965: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
1966: false (default), the iterator will only return the first level of map
1967: that is not just a single, 'redirecting' map. If true, the iterator
1968: will return all information, starting with the top-level map,
1969: regardless of content. returnTopMap, if true (default false), will
1970: cause the iterator to return the top-level map object (resource 0.0)
1971: before anything else.
1972:
1973: Thus, by default, only top-level resources will be shown. Change the
1974: condition to a 1 without changing the hash, and all resources will be
1975: shown. Changing the condition to 1 and including some values in the
1976: hash will allow you to selectively suppress parts of the navmap, while
1977: leaving it on 0 and adding things to the hash will allow you to
1978: selectively add parts of the nav map. See the handler code for
1979: examples.
1980:
1981: The iterator will return either a reference to a resource object, or a
1982: token representing something in the map, such as the beginning of a
1983: new branch. The possible tokens are:
1984:
1985: =over 4
1986:
1987: =item * BEGIN_MAP:
1988:
1989: A new map is being recursed into. This is returned I<after> the map
1990: resource itself is returned.
1991:
1992: =item * END_MAP:
1993:
1994: The map is now done.
1995:
1996: =item * BEGIN_BRANCH:
1997:
1998: A branch is now starting. The next resource returned will be the first
1999: in that branch.
2000:
2001: =item * END_BRANCH:
2002:
2003: The branch is now done.
2004:
2005: =back
2006:
2007: The tokens are retreivable via methods on the iterator object, i.e.,
2008: $iterator->END_MAP.
2009:
2010: Maps can contain empty resources. The iterator will automatically skip
2011: over such resources, but will still treat the structure
2012: correctly. Thus, a complicated map with several branches, but
2013: consisting entirely of empty resources except for one beginning or
2014: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2015: but only one resource will be returned.
2016:
2017: =back
2018:
2019: =cut
2020:
2021: # Here are the tokens for the iterator:
2022:
2023: sub BEGIN_MAP { return 1; } # begining of a new map
2024: sub END_MAP { return 2; } # end of the map
2025: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2026: sub END_BRANCH { return 4; } # end of a branch
2027: sub FORWARD { return 1; } # go forward
2028: sub BACKWARD { return 2; }
2029:
2030: sub min {
2031: (my $a, my $b) = @_;
2032: if ($a < $b) { return $a; } else { return $b; }
2033: }
2034:
2035: # In the CVS repository, documentation of this algorithm is included
2036: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
2037: # will reference the same location in the text as the part of the
2038: # algorithm is running through.
2039:
2040: sub new {
2041: # magic invocation to create a class instance
2042: my $proto = shift;
2043: my $class = ref($proto) || $proto;
2044: my $self = {};
2045:
2046: $self->{NAV_MAP} = shift;
2047: return undef unless ($self->{NAV_MAP});
2048:
2049: # Handle the parameters
2050: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2051: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2052:
2053: # If the given resources are just the ID of the resource, get the
2054: # objects
2055: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2056: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2057: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2058: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2059:
2060: $self->{FILTER} = shift;
2061:
2062: # A hash, used as a set, of resource already seen
2063: $self->{ALREADY_SEEN} = shift;
2064: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2065: $self->{CONDITION} = shift;
2066:
2067: # Do we want to automatically follow "redirection" maps?
2068: $self->{FORCE_TOP} = shift;
2069:
2070: # Do we want to return the top-level map object (resource 0.0)?
2071: $self->{RETURN_0} = shift;
2072: # have we done that yet?
2073: $self->{HAVE_RETURNED_0} = 0;
2074:
2075: # Now, we need to pre-process the map, by walking forward and backward
2076: # over the parts of the map we're going to look at.
2077:
2078: # The processing steps are exactly the same, except for a few small
2079: # changes, so I bundle those up in the following list of two elements:
2080: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2081: # first_resource).
2082: # This prevents writing nearly-identical code twice.
2083: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2084: 'FIRST_RESOURCE'],
2085: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2086: 'FINISH_RESOURCE'] );
2087:
2088: my $maxDepth = 0; # tracks max depth
2089:
2090: # If there is only one resource in this map, and it's a map, we
2091: # want to remember that, so the user can ask for the first map
2092: # that isn't just a redirector.
2093: my $resource; my $resourceCount = 0;
2094:
2095: # **1**
2096:
2097: foreach my $pass (@iterations) {
2098: my $direction = $pass->[0];
2099: my $valName = $pass->[1];
2100: my $nextResourceMethod = $pass->[2];
2101: my $firstResourceName = $pass->[3];
2102:
2103: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2104: $self->{FIRST_RESOURCE},
2105: $self->{FINISH_RESOURCE},
2106: {}, undef, 0, $direction);
2107:
2108: # prime the recursion
2109: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2110: my $depth = 0;
2111: $iterator->next();
2112: my $curRes = $iterator->next();
2113: while ($depth > -1) {
2114: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2115: if ($curRes == $iterator->END_MAP()) { $depth--; }
2116:
2117: if (ref($curRes)) {
2118: # If there's only one resource, this will save it
2119: # we have to filter empty resources from consideration here,
2120: # or even "empty", redirecting maps have two (start & finish)
2121: # or three (start, finish, plus redirector)
2122: if($direction == FORWARD && $curRes->src()) {
2123: $resource = $curRes; $resourceCount++;
2124: }
2125: my $resultingVal = $curRes->{DATA}->{$valName};
2126: my $nextResources = $curRes->$nextResourceMethod();
2127: my $nextCount = scalar(@{$nextResources});
2128:
2129: if ($nextCount == 1) { # **3**
2130: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2131: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2132: }
2133:
2134: if ($nextCount > 1) { # **4**
2135: foreach my $res (@{$nextResources}) {
2136: my $current = $res->{DATA}->{$valName} || 999999999;
2137: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2138: }
2139: }
2140: }
2141:
2142: # Assign the final val (**2**)
2143: if (ref($curRes) && $direction == BACKWARD()) {
2144: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2145: $curRes->{DATA}->{BOT_UP_VAL});
2146:
2147: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2148: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2149: }
2150: $curRes = $iterator->next();
2151: }
2152: }
2153:
2154: # Check: Was this only one resource, a map?
2155: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2156: my $firstResource = $resource->map_start();
2157: my $finishResource = $resource->map_finish();
2158: return
2159: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2160: $finishResource, $self->{FILTER},
2161: $self->{ALREADY_SEEN},
2162: $self->{CONDITION}, 0);
2163:
2164: }
2165:
2166: # Set up some bookkeeping information.
2167: $self->{CURRENT_DEPTH} = 0;
2168: $self->{MAX_DEPTH} = $maxDepth;
2169: $self->{STACK} = [];
2170: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2171:
2172: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2173: push @{$self->{STACK}}, [];
2174: }
2175:
2176: # Prime the recursion w/ the first resource **5**
2177: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2178: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2179:
2180: bless ($self);
2181:
2182: return $self;
2183: }
2184:
2185: sub next {
2186: my $self = shift;
2187:
2188: # If we want to return the top-level map object, and haven't yet,
2189: # do so.
2190: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2191: $self->{HAVE_RETURNED_0} = 1;
2192: return $self->{NAV_MAP}->getById('0.0');
2193: }
2194:
2195: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2196: # grab the next from the recursive iterator
2197: my $next = $self->{RECURSIVE_ITERATOR}->next();
2198:
2199: # is it a begin or end map? If so, update the depth
2200: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2201: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2202:
2203: # Are we back at depth 0? If so, stop recursing
2204: if ($self->{RECURSIVE_DEPTH} == 0) {
2205: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2206: }
2207:
2208: return $next;
2209: }
2210:
2211: if (defined($self->{FORCE_NEXT})) {
2212: my $tmp = $self->{FORCE_NEXT};
2213: $self->{FORCE_NEXT} = undef;
2214: return $tmp;
2215: }
2216:
2217: # Have we not yet begun? If not, return BEGIN_MAP and
2218: # remember we've started.
2219: if ( !$self->{STARTED} ) {
2220: $self->{STARTED} = 1;
2221: return $self->BEGIN_MAP();
2222: }
2223:
2224: # Here's the guts of the iterator.
2225:
2226: # Find the next resource, if any.
2227: my $found = 0;
2228: my $i = $self->{MAX_DEPTH};
2229: my $newDepth;
2230: my $here;
2231: while ( $i >= 0 && !$found ) {
2232: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2233: $here = pop @{$self->{STACK}->[$i]}; # **7**
2234: $found = 1;
2235: $newDepth = $i;
2236: }
2237: $i--;
2238: }
2239:
2240: # If we still didn't find anything, we're done.
2241: if ( !$found ) {
2242: # We need to get back down to the correct branch depth
2243: if ( $self->{CURRENT_DEPTH} > 0 ) {
2244: $self->{CURRENT_DEPTH}--;
2245: return END_BRANCH();
2246: } else {
2247: return END_MAP();
2248: }
2249: }
2250:
2251: # If this is not a resource, it must be an END_BRANCH marker we want
2252: # to return directly.
2253: if (!ref($here)) { # **8**
2254: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2255: $self->{CURRENT_DEPTH}--;
2256: return $here;
2257: }
2258: }
2259:
2260: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2261: $self->{HERE} = $here;
2262:
2263: # Get to the right level
2264: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2265: push @{$self->{STACK}->[$newDepth]}, $here;
2266: $self->{CURRENT_DEPTH}--;
2267: return END_BRANCH();
2268: }
2269: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2270: push @{$self->{STACK}->[$newDepth]}, $here;
2271: $self->{CURRENT_DEPTH}++;
2272: return BEGIN_BRANCH();
2273: }
2274:
2275: # If we made it here, we have the next resource, and we're at the
2276: # right branch level. So let's examine the resource for where
2277: # we can get to from here.
2278:
2279: # So we need to look at all the resources we can get to from here,
2280: # categorize them if we haven't seen them, remember if we have a new
2281: my $nextUnfiltered = $here->getNext();
2282: my $maxDepthAdded = -1;
2283:
2284: for (@$nextUnfiltered) {
2285: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2286: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2287: push @{$self->{STACK}->[$depth]}, $_;
2288: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2289: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2290: }
2291: }
2292:
2293: # Is this the end of a branch? If so, all of the resources examined above
2294: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2295: # marker onto the stack so we don't forget.
2296: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2297: # BC branch and gets to C, it will see F as the only next resource, but it's
2298: # one level lower. Thus, this is the end of the branch, since there are no
2299: # more resources added to this level or above.
2300: # We don't do this if the examined resource is the finish resource,
2301: # because the condition given above is true, but the "END_MAP" will
2302: # take care of things and we should already be at depth 0.
2303: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2304: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2305: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2306: }
2307:
2308: # That ends the main iterator logic. Now, do we want to recurse
2309: # down this map (if this resource is a map)?
2310: if ($self->{HERE}->is_map() &&
2311: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2312: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2313: my $firstResource = $self->{HERE}->map_start();
2314: my $finishResource = $self->{HERE}->map_finish();
2315:
2316: $self->{RECURSIVE_ITERATOR} =
2317: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2318: $finishResource, $self->{FILTER},
2319: $self->{ALREADY_SEEN}, $self->{CONDITION});
2320: }
2321:
2322: # If this is a blank resource, don't actually return it.
2323: # Should you ever find you need it, make sure to add an option to the code
2324: # that you can use; other things depend on this behavior.
2325: my $browsePriv = $self->{HERE}->browsePriv();
2326: if (!$self->{HERE}->src() ||
2327: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2328: return $self->next();
2329: }
2330:
2331: return $self->{HERE};
2332:
2333: }
2334:
2335: =pod
2336:
2337: The other method available on the iterator is B<getStack>, which
2338: returns an array populated with the current 'stack' of maps, as
2339: references to the resource objects. Example: This is useful when
2340: making the navigation map, as we need to check whether we are under a
2341: page map to see if we need to link directly to the resource, or to the
2342: page. The first elements in the array will correspond to the top of
2343: the stack (most inclusive map).
2344:
2345: =cut
2346:
2347: sub getStack {
2348: my $self=shift;
2349:
2350: my @stack;
2351:
2352: $self->populateStack(\@stack);
2353:
2354: return \@stack;
2355: }
2356:
2357: # Private method: Calls the iterators recursively to populate the stack.
2358: sub populateStack {
2359: my $self=shift;
2360: my $stack = shift;
2361:
2362: push @$stack, $self->{HERE} if ($self->{HERE});
2363:
2364: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2365: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2366: }
2367: }
2368:
2369: 1;
2370:
2371: package Apache::lonnavmaps::DFSiterator;
2372:
2373: # Not documented in the perldoc: This is a simple iterator that just walks
2374: # through the nav map and presents the resources in a depth-first search
2375: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2376: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2377: # useful for pre-processing of some kind, and is in fact used by the main
2378: # iterator that way, but that's about it.
2379: # One could imagine merging this into the init routine of the main iterator,
2380: # but this might as well be left seperate, since it is possible some other
2381: # use might be found for it. - Jeremy
2382:
2383: # Unlike the main iterator, this DOES return all resources, even blank ones.
2384: # The main iterator needs them to correctly preprocess the map.
2385:
2386: sub BEGIN_MAP { return 1; } # begining of a new map
2387: sub END_MAP { return 2; } # end of the map
2388: sub FORWARD { return 1; } # go forward
2389: sub BACKWARD { return 2; }
2390:
2391: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2392: # filter hash ref (or undef), already seen hash or undef, condition
2393: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2394: sub new {
2395: # magic invocation to create a class instance
2396: my $proto = shift;
2397: my $class = ref($proto) || $proto;
2398: my $self = {};
2399:
2400: $self->{NAV_MAP} = shift;
2401: return undef unless ($self->{NAV_MAP});
2402:
2403: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2404: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2405:
2406: # If the given resources are just the ID of the resource, get the
2407: # objects
2408: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2409: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2410: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2411: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2412:
2413: $self->{FILTER} = shift;
2414:
2415: # A hash, used as a set, of resource already seen
2416: $self->{ALREADY_SEEN} = shift;
2417: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2418: $self->{CONDITION} = shift;
2419: $self->{DIRECTION} = shift || FORWARD();
2420:
2421: # Flag: Have we started yet?
2422: $self->{STARTED} = 0;
2423:
2424: # Should we continue calling the recursive iterator, if any?
2425: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2426: # The recursive iterator, if any
2427: $self->{RECURSIVE_ITERATOR} = undef;
2428: # Are we recursing on a map, or a branch?
2429: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2430: # And the count of how deep it is, so that this iterator can keep track of
2431: # when to pick back up again.
2432: $self->{RECURSIVE_DEPTH} = 0;
2433:
2434: # For keeping track of our branches, we maintain our own stack
2435: $self->{STACK} = [];
2436:
2437: # Start with the first resource
2438: if ($self->{DIRECTION} == FORWARD) {
2439: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2440: } else {
2441: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2442: }
2443:
2444: bless($self);
2445: return $self;
2446: }
2447:
2448: sub next {
2449: my $self = shift;
2450:
2451: # Are we using a recursive iterator? If so, pull from that and
2452: # watch the depth; we want to resume our level at the correct time.
2453: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2454: # grab the next from the recursive iterator
2455: my $next = $self->{RECURSIVE_ITERATOR}->next();
2456:
2457: # is it a begin or end map? Update depth if so
2458: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2459: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2460:
2461: # Are we back at depth 0? If so, stop recursing.
2462: if ($self->{RECURSIVE_DEPTH} == 0) {
2463: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2464: }
2465:
2466: return $next;
2467: }
2468:
2469: # Is there a current resource to grab? If not, then return
2470: # END_MAP, which will end the iterator.
2471: if (scalar(@{$self->{STACK}}) == 0) {
2472: return $self->END_MAP();
2473: }
2474:
2475: # Have we not yet begun? If not, return BEGIN_MAP and
2476: # remember that we've started.
2477: if ( !$self->{STARTED} ) {
2478: $self->{STARTED} = 1;
2479: return $self->BEGIN_MAP;
2480: }
2481:
2482: # Get the next resource in the branch
2483: $self->{HERE} = pop @{$self->{STACK}};
2484:
2485: # remember that we've seen this, so we don't return it again later
2486: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2487:
2488: # Get the next possible resources
2489: my $nextUnfiltered;
2490: if ($self->{DIRECTION} == FORWARD()) {
2491: $nextUnfiltered = $self->{HERE}->getNext();
2492: } else {
2493: $nextUnfiltered = $self->{HERE}->getPrevious();
2494: }
2495: my $next = [];
2496:
2497: # filter the next possibilities to remove things we've
2498: # already seen.
2499: foreach (@$nextUnfiltered) {
2500: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2501: push @$next, $_;
2502: }
2503: }
2504:
2505: while (@$next) {
2506: # copy the next possibilities over to the stack
2507: push @{$self->{STACK}}, shift @$next;
2508: }
2509:
2510: # If this is a map and we want to recurse down it... (not filtered out)
2511: if ($self->{HERE}->is_map() &&
2512: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2513: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2514: my $firstResource = $self->{HERE}->map_start();
2515: my $finishResource = $self->{HERE}->map_finish();
2516:
2517: $self->{RECURSIVE_ITERATOR} =
2518: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2519: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2520: $self->{CONDITION}, $self->{DIRECTION});
2521: }
2522:
2523: return $self->{HERE};
2524: }
2525:
2526: 1;
2527:
2528: package Apache::lonnavmaps::resource;
2529:
2530: use Apache::lonnet;
2531:
2532: =pod
2533:
2534: =head1 Object: resource
2535:
2536: A resource object encapsulates a resource in a resource map, allowing
2537: easy manipulation of the resource, querying the properties of the
2538: resource (including user properties), and represents a reference that
2539: can be used as the canonical representation of the resource by
2540: lonnavmap clients like renderers.
2541:
2542: A resource only makes sense in the context of a navmap, as some of the
2543: data is stored in the navmap object.
2544:
2545: You will probably never need to instantiate this object directly. Use
2546: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2547: starting resource.
2548:
2549: =head2 Public Members
2550:
2551: resource objects have a hash called DATA ($resourceRef->{DATA}) that
2552: you can store whatever you want in. This allows you to easily do
2553: two-pass algorithms without worrying about managing your own
2554: resource->data hash.
2555:
2556: =head2 Methods
2557:
2558: =over 4
2559:
2560: =item * B<new>($navmapRef, $idString):
2561:
2562: The first arg is a reference to the parent navmap object. The second
2563: is the idString of the resource itself. Very rarely, if ever, called
2564: directly. Use the nav map->getByID() method.
2565:
2566: =back
2567:
2568: =cut
2569:
2570: sub new {
2571: # magic invocation to create a class instance
2572: my $proto = shift;
2573: my $class = ref($proto) || $proto;
2574: my $self = {};
2575:
2576: $self->{NAV_MAP} = shift;
2577: $self->{ID} = shift;
2578:
2579: # Store this new resource in the parent nav map's cache.
2580: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
2581: $self->{RESOURCE_ERROR} = 0;
2582:
2583: # A hash that can be used by two-pass algorithms to store data
2584: # about this resource in. Not used by the resource object
2585: # directly.
2586: $self->{DATA} = {};
2587:
2588: bless($self);
2589:
2590: return $self;
2591: }
2592:
2593: # private function: simplify the NAV_HASH lookups we keep doing
2594: # pass the name, and to automatically append my ID, pass a true val on the
2595: # second param
2596: sub navHash {
2597: my $self = shift;
2598: my $param = shift;
2599: my $id = shift;
2600: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
2601: }
2602:
2603: =pod
2604:
2605: B<Metadata Retreival>
2606:
2607: These are methods that help you retrieve metadata about the resource:
2608: Method names are based on the fields in the compiled course
2609: representation.
2610:
2611: =over 4
2612:
2613: =item * B<compTitle>:
2614:
2615: Returns a "composite title", that is equal to $res->title() if the
2616: resource has a title, and is otherwise the last part of the URL (e.g.,
2617: "problem.problem").
2618:
2619: =item * B<ext>:
2620:
2621: Returns true if the resource is external.
2622:
2623: =item * B<goesto>:
2624:
2625: Returns the "goesto" value from the compiled nav map. (It is likely
2626: you want to use B<getNext> instead.)
2627:
2628: =item * B<kind>:
2629:
2630: Returns the kind of the resource from the compiled nav map.
2631:
2632: =item * B<randomout>:
2633:
2634: Returns true if this resource was chosen to NOT be shown to the user
2635: by the random map selection feature. In other words, this is usually
2636: false.
2637:
2638: =item * B<randompick>:
2639:
2640: Returns true for a map if the randompick feature is being used on the
2641: map. (?)
2642:
2643: =item * B<src>:
2644:
2645: Returns the source for the resource.
2646:
2647: =item * B<symb>:
2648:
2649: Returns the symb for the resource.
2650:
2651: =item * B<title>:
2652:
2653: Returns the title of the resource.
2654:
2655: =item * B<to>:
2656:
2657: Returns the "to" value from the compiled nav map. (It is likely you
2658: want to use B<getNext> instead.)
2659:
2660: =back
2661:
2662: =cut
2663:
2664: # These info functions can be used directly, as they don't return
2665: # resource information.
2666: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
2667: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
2668: sub from { my $self=shift; return $self->navHash("from_", 1); }
2669: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2670: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
2671: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2672: sub randompick {
2673: my $self = shift;
2674: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2675: '.0.parameter_randompick'};
2676: }
2677: sub src {
2678: my $self=shift;
2679: return $self->navHash("src_", 1);
2680: }
2681: sub symb {
2682: my $self=shift;
2683: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2684: my $symbSrc = &Apache::lonnet::declutter($self->src());
2685: return &Apache::lonnet::declutter(
2686: $self->navHash('map_id_'.$first))
2687: . '___' . $second . '___' . $symbSrc;
2688: }
2689: sub title { my $self=shift; return $self->navHash("title_", 1); }
2690: sub to { my $self=shift; return $self->navHash("to_", 1); }
2691: sub compTitle {
2692: my $self = shift;
2693: my $title = $self->title();
2694: $title=~s/\&colon\;/\:/gs;
2695: if (!$title) {
2696: $title = $self->src();
2697: $title = substr($title, rindex($title, '/') + 1);
2698: }
2699: return $title;
2700: }
2701: =pod
2702:
2703: B<Predicate Testing the Resource>
2704:
2705: These methods are shortcuts to deciding if a given resource has a given property.
2706:
2707: =over 4
2708:
2709: =item * B<is_map>:
2710:
2711: Returns true if the resource is a map type.
2712:
2713: =item * B<is_problem>:
2714:
2715: Returns true if the resource is a problem type, false
2716: otherwise. (Looks at the extension on the src field; might need more
2717: to work correctly.)
2718:
2719: =item * B<is_page>:
2720:
2721: Returns true if the resource is a page.
2722:
2723: =item * B<is_sequence>:
2724:
2725: Returns true if the resource is a sequence.
2726:
2727: =back
2728:
2729: =cut
2730:
2731:
2732: sub is_html {
2733: my $self=shift;
2734: my $src = $self->src();
2735: return ($src =~ /html$/);
2736: }
2737: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2738: sub is_page {
2739: my $self=shift;
2740: my $src = $self->src();
2741: return ($src =~ /page$/);
2742: }
2743: sub is_problem {
2744: my $self=shift;
2745: my $src = $self->src();
2746: return ($src =~ /problem$/);
2747: }
2748: sub is_sequence {
2749: my $self=shift;
2750: my $src = $self->src();
2751: return ($src =~ /sequence$/);
2752: }
2753:
2754: # Private method: Shells out to the parmval in the nav map, handler parts.
2755: sub parmval {
2756: my $self = shift;
2757: my $what = shift;
2758: my $part = shift || "0";
2759: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2760: }
2761:
2762: =pod
2763:
2764: B<Map Methods>
2765:
2766: These methods are useful for getting information about the map
2767: properties of the resource, if the resource is a map (B<is_map>).
2768:
2769: =over 4
2770:
2771: =item * B<map_finish>:
2772:
2773: Returns a reference to a resource object corresponding to the finish
2774: resource of the map.
2775:
2776: =item * B<map_pc>:
2777:
2778: Returns the pc value of the map, which is the first number that
2779: appears in the resource ID of the resources in the map, and is the
2780: number that appears around the middle of the symbs of the resources in
2781: that map.
2782:
2783: =item * B<map_start>:
2784:
2785: Returns a reference to a resource object corresponding to the start
2786: resource of the map.
2787:
2788: =item * B<map_type>:
2789:
2790: Returns a string with the type of the map in it.
2791:
2792: =back
2793:
2794: =cut
2795:
2796: sub map_finish {
2797: my $self = shift;
2798: my $src = $self->src();
2799: $src = Apache::lonnet::clutter($src);
2800: my $res = $self->navHash("map_finish_$src", 0);
2801: $res = $self->{NAV_MAP}->getById($res);
2802: return $res;
2803: }
2804: sub map_pc {
2805: my $self = shift;
2806: my $src = $self->src();
2807: return $self->navHash("map_pc_$src", 0);
2808: }
2809: sub map_start {
2810: my $self = shift;
2811: my $src = $self->src();
2812: $src = Apache::lonnet::clutter($src);
2813: my $res = $self->navHash("map_start_$src", 0);
2814: $res = $self->{NAV_MAP}->getById($res);
2815: return $res;
2816: }
2817: sub map_type {
2818: my $self = shift;
2819: my $pc = $self->map_pc();
2820: return $self->navHash("map_type_$pc", 0);
2821: }
2822:
2823:
2824:
2825: #####
2826: # Property queries
2827: #####
2828:
2829: # These functions will be responsible for returning the CORRECT
2830: # VALUE for the parameter, no matter what. So while they may look
2831: # like direct calls to parmval, they can be more then that.
2832: # So, for instance, the duedate function should use the "duedatetype"
2833: # information, rather then the resource object user.
2834:
2835: =pod
2836:
2837: =head2 Resource Parameters
2838:
2839: In order to use the resource parameters correctly, the nav map must
2840: have been instantiated with genCourseAndUserOptions set to true, so
2841: the courseopt and useropt is read correctly. Then, you can call these
2842: functions to get the relevant parameters for the resource. Each
2843: function defaults to part "0", but can be directed to another part by
2844: passing the part as the parameter.
2845:
2846: These methods are responsible for getting the parameter correct, not
2847: merely reflecting the contents of the GDBM hashes. As we move towards
2848: dates relative to other dates, these methods should be updated to
2849: reflect that. (Then, anybody using these methods will not have to update
2850: their code.)
2851:
2852: =over 4
2853:
2854: =item * B<acc>:
2855:
2856: Get the Client IP/Name Access Control information.
2857:
2858: =item * B<answerdate>:
2859:
2860: Get the answer-reveal date for the problem.
2861:
2862: =item * B<duedate>:
2863:
2864: Get the due date for the problem.
2865:
2866: =item * B<tries>:
2867:
2868: Get the number of tries the student has used on the problem.
2869:
2870: =item * B<maxtries>:
2871:
2872: Get the number of max tries allowed.
2873:
2874: =item * B<opendate>:
2875:
2876: Get the open date for the problem.
2877:
2878: =item * B<sig>:
2879:
2880: Get the significant figures setting.
2881:
2882: =item * B<tol>:
2883:
2884: Get the tolerance for the problem.
2885:
2886: =item * B<tries>:
2887:
2888: Get the number of tries the user has already used on the problem.
2889:
2890: =item * B<type>:
2891:
2892: Get the question type for the problem.
2893:
2894: =item * B<weight>:
2895:
2896: Get the weight for the problem.
2897:
2898: =back
2899:
2900: =cut
2901:
2902: sub acc {
2903: (my $self, my $part) = @_;
2904: return $self->parmval("acc", $part);
2905: }
2906: sub answerdate {
2907: (my $self, my $part) = @_;
2908: # Handle intervals
2909: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2910: return $self->duedate($part) +
2911: $self->parmval("answerdate", $part);
2912: }
2913: return $self->parmval("answerdate", $part);
2914: }
2915: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
2916: sub duedate {
2917: (my $self, my $part) = @_;
2918: return $self->parmval("duedate", $part);
2919: }
2920: sub maxtries {
2921: (my $self, my $part) = @_;
2922: return $self->parmval("maxtries", $part);
2923: }
2924: sub opendate {
2925: (my $self, my $part) = @_;
2926: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2927: return $self->duedate($part) -
2928: $self->parmval("opendate", $part);
2929: }
2930: return $self->parmval("opendate");
2931: }
2932: sub sig {
2933: (my $self, my $part) = @_;
2934: return $self->parmval("sig", $part);
2935: }
2936: sub tol {
2937: (my $self, my $part) = @_;
2938: return $self->parmval("tol", $part);
2939: }
2940: sub tries {
2941: my $self = shift;
2942: my $tries = $self->queryRestoreHash('tries', shift);
2943: if (!defined($tries)) { return '0';}
2944: return $tries;
2945: }
2946: sub type {
2947: (my $self, my $part) = @_;
2948: return $self->parmval("type", $part);
2949: }
2950: sub weight {
2951: my $self = shift; my $part = shift;
2952: return $self->parmval("weight", $part);
2953: }
2954:
2955: # Multiple things need this
2956: sub getReturnHash {
2957: my $self = shift;
2958:
2959: if (!defined($self->{RETURN_HASH})) {
2960: my %tmpHash = &Apache::lonnet::restore($self->symb());
2961: $self->{RETURN_HASH} = \%tmpHash;
2962: }
2963: }
2964:
2965: ######
2966: # Status queries
2967: ######
2968:
2969: # These methods query the status of problems.
2970:
2971: # If we need to count parts, this function determines the number of
2972: # parts from the metadata. When called, it returns a reference to a list
2973: # of strings corresponding to the parts. (Thus, using it in a scalar context
2974: # tells you how many parts you have in the problem:
2975: # $partcount = scalar($resource->countParts());
2976: # Don't use $self->{PARTS} directly because you don't know if it's been
2977: # computed yet.
2978:
2979: =pod
2980:
2981: =head2 Resource misc
2982:
2983: Misc. functions for the resource.
2984:
2985: =over 4
2986:
2987: =item * B<hasDiscussion>:
2988:
2989: Returns a false value if there has been discussion since the user last
2990: logged in, true if there has. Always returns false if the discussion
2991: data was not extracted when the nav map was constructed.
2992:
2993: =item * B<getFeedback>:
2994:
2995: Gets the feedback for the resource and returns the raw feedback string
2996: for the resource, or the null string if there is no feedback or the
2997: email data was not extracted when the nav map was constructed. Usually
2998: used like this:
2999:
3000: for (split(/\,/, $res->getFeedback())) {
3001: my $link = &Apache::lonnet::escape($_);
3002: ...
3003:
3004: and use the link as appropriate.
3005:
3006: =cut
3007:
3008: sub hasDiscussion {
3009: my $self = shift;
3010: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3011: }
3012:
3013: sub getFeedback {
3014: my $self = shift;
3015: my $source = $self->src();
3016: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3017: return $self->{NAV_MAP}->getFeedback($source);
3018: }
3019:
3020: sub getErrors {
3021: my $self = shift;
3022: my $source = $self->src();
3023: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3024: return $self->{NAV_MAP}->getErrors($source);
3025: }
3026:
3027: =pod
3028:
3029: =item * B<parts>():
3030:
3031: Returns a list reference containing sorted strings corresponding to
3032: each part of the problem. To count the number of parts, use the list
3033: in a scalar context, and subtract one if greater than two. (One part
3034: problems have a part 0. Multi-parts have a part 0, plus a part for
3035: each part. Filtering part 0 if you want it is up to you.)
3036:
3037: =item * B<countParts>():
3038:
3039: Returns the number of parts of the problem a student can answer. Thus,
3040: for single part problems, returns 1. For multipart, it returns the
3041: number of parts in the problem, not including psuedo-part 0. Thus,
3042: B<parts> may return an array with fewer parts in it then countParts
3043: might lead you to believe.
3044:
3045: =back
3046:
3047: =cut
3048:
3049: sub parts {
3050: my $self = shift;
3051:
3052: if ($self->ext) { return ['0']; }
3053:
3054: $self->extractParts();
3055: return $self->{PARTS};
3056: }
3057:
3058: sub countParts {
3059: my $self = shift;
3060:
3061: my $parts = $self->parts();
3062: my $delta = 0;
3063: for my $part (@$parts) {
3064: if ($part eq '0') { $delta--; }
3065: }
3066:
3067: if ($self->{RESOURCE_ERROR}) {
3068: return 0;
3069: }
3070:
3071: return scalar(@{$parts}) + $delta;
3072: }
3073:
3074: # Private function: Extracts the parts information and saves it
3075: sub extractParts {
3076: my $self = shift;
3077:
3078: return if (defined($self->{PARTS}));
3079: return if ($self->ext);
3080:
3081: $self->{PARTS} = [];
3082:
3083: # Retrieve part count, if this is a problem
3084: if ($self->is_problem()) {
3085: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3086: if (!$metadata) {
3087: $self->{RESOURCE_ERROR} = 1;
3088: $self->{PARTS} = [];
3089: return;
3090: }
3091: foreach (split(/\,/,$metadata)) {
3092: if ($_ =~ /^part_(.*)$/) {
3093: my $part = $1;
3094: # check to see if part is turned off.
3095: if (! Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3096: push @{$self->{PARTS}}, $1;
3097: }
3098: }
3099: }
3100:
3101:
3102: my @sortedParts = sort @{$self->{PARTS}};
3103: $self->{PARTS} = \@sortedParts;
3104: }
3105:
3106: return;
3107: }
3108:
3109: =pod
3110:
3111: =head2 Resource Status
3112:
3113: Problem resources have status information, reflecting their various
3114: dates and completion statuses.
3115:
3116: There are two aspects to the status: the date-related information and
3117: the completion information.
3118:
3119: Idiomatic usage of these two methods would probably look something
3120: like
3121:
3122: foreach ($resource->parts()) {
3123: my $dateStatus = $resource->getDateStatus($_);
3124: my $completionStatus = $resource->getCompletionStatus($_);
3125:
3126: or
3127:
3128: my $status = $resource->status($_);
3129:
3130: ... use it here ...
3131: }
3132:
3133: Which you use depends on exactly what you are looking for. The
3134: status() function has been optimized for the nav maps display and may
3135: not precisely match what you need elsewhere.
3136:
3137: The symbolic constants shown below can be accessed through the
3138: resource object: C<$res->OPEN>.
3139:
3140: =over 4
3141:
3142: =item * B<getDateStatus>($part):
3143:
3144: ($part defaults to 0). A convenience function that returns a symbolic
3145: constant telling you about the date status of the part. The possible
3146: return values are:
3147:
3148: =back
3149:
3150: B<Date Codes>
3151:
3152: =over 4
3153:
3154: =item * B<OPEN_LATER>:
3155:
3156: The problem will be opened later.
3157:
3158: =item * B<OPEN>:
3159:
3160: Open and not yet due.
3161:
3162:
3163: =item * B<PAST_DUE_ANSWER_LATER>:
3164:
3165: The due date has passed, but the answer date has not yet arrived.
3166:
3167: =item * B<PAST_DUE_NO_ANSWER>:
3168:
3169: The due date has passed and there is no answer opening date set.
3170:
3171: =item * B<ANSWER_OPEN>:
3172:
3173: The answer date is here.
3174:
3175: =item * B<NETWORK_FAILURE>:
3176:
3177: The information is unknown due to network failure.
3178:
3179: =back
3180:
3181: =cut
3182:
3183: # Apparently the compiler optimizes these into constants automatically
3184: sub OPEN_LATER { return 0; }
3185: sub OPEN { return 1; }
3186: sub PAST_DUE_NO_ANSWER { return 2; }
3187: sub PAST_DUE_ANSWER_LATER { return 3; }
3188: sub ANSWER_OPEN { return 4; }
3189: sub NOTHING_SET { return 5; }
3190: sub NETWORK_FAILURE { return 100; }
3191:
3192: # getDateStatus gets the date status for a given problem part.
3193: # Because answer date, due date, and open date are fully independent
3194: # (i.e., it is perfectly possible to *only* have an answer date),
3195: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3196: # (past, future, none given). This function handles this with a decision
3197: # tree. Read the comments to follow the decision tree.
3198:
3199: sub getDateStatus {
3200: my $self = shift;
3201: my $part = shift;
3202: $part = "0" if (!defined($part));
3203:
3204: # Always return network failure if there was one.
3205: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3206:
3207: my $now = time();
3208:
3209: my $open = $self->opendate($part);
3210: my $due = $self->duedate($part);
3211: my $answer = $self->answerdate($part);
3212:
3213: if (!$open && !$due && !$answer) {
3214: # no data on the problem at all
3215: # should this be the same as "open later"? think multipart.
3216: return $self->NOTHING_SET;
3217: }
3218: if (!$open || $now < $open) {return $self->OPEN_LATER}
3219: if (!$due || $now < $due) {return $self->OPEN}
3220: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3221: if ($answer) { return $self->ANSWER_OPEN; }
3222: return PAST_DUE_NO_ANSWER;
3223: }
3224:
3225: =pod
3226:
3227: B<>
3228:
3229: =over 4
3230:
3231: =item * B<getCompletionStatus>($part):
3232:
3233: ($part defaults to 0.) A convenience function that returns a symbolic
3234: constant telling you about the completion status of the part, with the
3235: following possible results:
3236:
3237: =back
3238:
3239: B<Completion Codes>
3240:
3241: =over 4
3242:
3243: =item * B<NOT_ATTEMPTED>:
3244:
3245: Has not been attempted at all.
3246:
3247: =item * B<INCORRECT>:
3248:
3249: Attempted, but wrong by student.
3250:
3251: =item * B<INCORRECT_BY_OVERRIDE>:
3252:
3253: Attempted, but wrong by instructor override.
3254:
3255: =item * B<CORRECT>:
3256:
3257: Correct or correct by instructor.
3258:
3259: =item * B<CORRECT_BY_OVERRIDE>:
3260:
3261: Correct by instructor override.
3262:
3263: =item * B<EXCUSED>:
3264:
3265: Excused. Not yet implemented.
3266:
3267: =item * B<NETWORK_FAILURE>:
3268:
3269: Information not available due to network failure.
3270:
3271: =item * B<ATTEMPTED>:
3272:
3273: Attempted, and not yet graded.
3274:
3275: =back
3276:
3277: =cut
3278:
3279: sub NOT_ATTEMPTED { return 10; }
3280: sub INCORRECT { return 11; }
3281: sub INCORRECT_BY_OVERRIDE { return 12; }
3282: sub CORRECT { return 13; }
3283: sub CORRECT_BY_OVERRIDE { return 14; }
3284: sub EXCUSED { return 15; }
3285: sub ATTEMPTED { return 16; }
3286:
3287: sub getCompletionStatus {
3288: my $self = shift;
3289: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3290:
3291: my $status = $self->queryRestoreHash('solved', shift);
3292:
3293: # Left as seperate if statements in case we ever do more with this
3294: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3295: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3296: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3297: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3298: if ($status eq 'excused') {return $self->EXCUSED; }
3299: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3300: return $self->NOT_ATTEMPTED;
3301: }
3302:
3303: sub queryRestoreHash {
3304: my $self = shift;
3305: my $hashentry = shift;
3306: my $part = shift;
3307: $part = "0" if (!defined($part));
3308: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3309:
3310: $self->getReturnHash();
3311:
3312: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3313: }
3314:
3315: =pod
3316:
3317: B<Composite Status>
3318:
3319: Along with directly returning the date or completion status, the
3320: resource object includes a convenience function B<status>() that will
3321: combine the two status tidbits into one composite status that can
3322: represent the status of the resource as a whole. The precise logic is
3323: documented in the comments of the status method. The following results
3324: may be returned, all available as methods on the resource object
3325: ($res->NETWORK_FAILURE):
3326:
3327: =over 4
3328:
3329: =item * B<NETWORK_FAILURE>:
3330:
3331: The network has failed and the information is not available.
3332:
3333: =item * B<NOTHING_SET>:
3334:
3335: No dates have been set for this problem (part) at all. (Because only
3336: certain parts of a multi-part problem may be assigned, this can not be
3337: collapsed into "open later", as we do not know a given part will EVER
3338: be opened. For single part, this is the same as "OPEN_LATER".)
3339:
3340: =item * B<CORRECT>:
3341:
3342: For any reason at all, the part is considered correct.
3343:
3344: =item * B<EXCUSED>:
3345:
3346: For any reason at all, the problem is excused.
3347:
3348: =item * B<PAST_DUE_NO_ANSWER>:
3349:
3350: The problem is past due, not considered correct, and no answer date is
3351: set.
3352:
3353: =item * B<PAST_DUE_ANSWER_LATER>:
3354:
3355: The problem is past due, not considered correct, and an answer date in
3356: the future is set.
3357:
3358: =item * B<ANSWER_OPEN>:
3359:
3360: The problem is past due, not correct, and the answer is now available.
3361:
3362: =item * B<OPEN_LATER>:
3363:
3364: The problem is not yet open.
3365:
3366: =item * B<TRIES_LEFT>:
3367:
3368: The problem is open, has been tried, is not correct, but there are
3369: tries left.
3370:
3371: =item * B<INCORRECT>:
3372:
3373: The problem is open, and all tries have been used without getting the
3374: correct answer.
3375:
3376: =item * B<OPEN>:
3377:
3378: The item is open and not yet tried.
3379:
3380: =item * B<ATTEMPTED>:
3381:
3382: The problem has been attempted.
3383:
3384: =back
3385:
3386: =cut
3387:
3388: sub TRIES_LEFT { return 10; }
3389:
3390: sub status {
3391: my $self = shift;
3392: my $part = shift;
3393: if (!defined($part)) { $part = "0"; }
3394: my $completionStatus = $self->getCompletionStatus($part);
3395: my $dateStatus = $self->getDateStatus($part);
3396:
3397: # What we have is a two-dimensional matrix with 4 entries on one
3398: # dimension and 5 entries on the other, which we want to colorize,
3399: # plus network failure and "no date data at all".
3400:
3401: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3402:
3403: # There are a few whole rows we can dispose of:
3404: if ($completionStatus == CORRECT ||
3405: $completionStatus == CORRECT_BY_OVERRIDE ) {
3406: return CORRECT;
3407: }
3408:
3409: if ($completionStatus == ATTEMPTED) {
3410: return ATTEMPTED;
3411: }
3412:
3413: # If it's EXCUSED, then return that no matter what
3414: if ($completionStatus == EXCUSED) {
3415: return EXCUSED;
3416: }
3417:
3418: if ($dateStatus == NOTHING_SET) {
3419: return NOTHING_SET;
3420: }
3421:
3422: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3423: # by 4 matrix (date statuses).
3424:
3425: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
3426: $dateStatus == PAST_DUE_NO_ANSWER ) {
3427: return $dateStatus;
3428: }
3429:
3430: if ($dateStatus == ANSWER_OPEN) {
3431: return ANSWER_OPEN;
3432: }
3433:
3434: # Now: (incorrect, incorrect_override, not_attempted) x
3435: # (open_later), (open)
3436:
3437: if ($dateStatus == OPEN_LATER) {
3438: return OPEN_LATER;
3439: }
3440:
3441: # If it's WRONG...
3442: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
3443: # and there are TRIES LEFT:
3444: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
3445: return TRIES_LEFT;
3446: }
3447: return INCORRECT; # otherwise, return orange; student can't fix this
3448: }
3449:
3450: # Otherwise, it's untried and open
3451: return OPEN;
3452: }
3453:
3454: =pod
3455:
3456: =head2 Resource/Nav Map Navigation
3457:
3458: =over 4
3459:
3460: =item * B<getNext>():
3461:
3462: Retreive an array of the possible next resources after this
3463: one. Always returns an array, even in the one- or zero-element case.
3464:
3465: =item * B<getPrevious>():
3466:
3467: Retreive an array of the possible previous resources from this
3468: one. Always returns an array, even in the one- or zero-element case.
3469:
3470: =cut
3471:
3472: sub getNext {
3473: my $self = shift;
3474: my @branches;
3475: my $to = $self->to();
3476: foreach my $branch ( split(/,/, $to) ) {
3477: my $choice = $self->{NAV_MAP}->getById($branch);
3478: my $next = $choice->goesto();
3479: $next = $self->{NAV_MAP}->getById($next);
3480:
3481: push @branches, $next;
3482: }
3483: return \@branches;
3484: }
3485:
3486: sub getPrevious {
3487: my $self = shift;
3488: my @branches;
3489: my $from = $self->from();
3490: foreach my $branch ( split /,/, $from) {
3491: my $choice = $self->{NAV_MAP}->getById($branch);
3492: my $prev = $choice->comesfrom();
3493: $prev = $self->{NAV_MAP}->getById($prev);
3494:
3495: push @branches, $prev;
3496: }
3497: return \@branches;
3498: }
3499:
3500: sub browsePriv {
3501: my $self = shift;
3502: if (defined($self->{BROWSE_PRIV})) {
3503: return $self->{BROWSE_PRIV};
3504: }
3505:
3506: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
3507: }
3508:
3509: =pod
3510:
3511: =back
3512:
3513: =cut
3514:
3515: 1;
3516:
3517: __END__
3518:
3519:
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