1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.177 2003/04/19 20:47:41 www 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 so,
173: # automatically display it
174: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
175: my $depth = 1;
176: $iterator->next();
177: my $curRes = $iterator->next();
178: my $sequenceCount = 0;
179: my $sequenceId;
180: while ($depth > 0) {
181: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
182: if ($curRes == $iterator->END_MAP()) { $depth--; }
183:
184: if (ref($curRes) && $curRes->is_sequence()) {
185: $sequenceCount++;
186: $sequenceId = $curRes->map_pc();
187: }
188:
189: $curRes = $iterator->next();
190: }
191:
192: if ($sequenceCount == 1) {
193: # The automatic iterator creation in the render call
194: # will pick this up.
195: $ENV{'form.filter'} = "$sequenceId";
196: }
197:
198: # renderer call
199: my $render = render({ 'cols' => [0,1,2,3],
200: 'url' => '/adm/navmaps',
201: 'navmap' => $navmap,
202: 'suppressNavmap' => 1,
203: 'r' => $r});
204:
205: $navmap->untieHashes();
206:
207: $r->print("</body></html>");
208: $r->rflush();
209:
210: return OK;
211: }
212:
213: # Convenience functions: Returns a string that adds or subtracts
214: # the second argument from the first hash, appropriate for the
215: # query string that determines which folders to recurse on
216: sub addToFilter {
217: my $hashIn = shift;
218: my $addition = shift;
219: my %hash = %$hashIn;
220: $hash{$addition} = 1;
221:
222: return join (",", keys(%hash));
223: }
224:
225: sub removeFromFilter {
226: my $hashIn = shift;
227: my $subtraction = shift;
228: my %hash = %$hashIn;
229:
230: delete $hash{$subtraction};
231: return join(",", keys(%hash));
232: }
233:
234: # Convenience function: Given a stack returned from getStack on the iterator,
235: # return the correct src() value.
236: # Later, this should add an anchor when we start putting anchors in pages.
237: sub getLinkForResource {
238: my $stack = shift;
239: my $res;
240:
241: # Check to see if there are any pages in the stack
242: foreach $res (@$stack) {
243: if (defined($res) && $res->is_page()) {
244: return $res->src();
245: }
246: }
247:
248: # Failing that, return the src of the last resource that is defined
249: # (when we first recurse on a map, it puts an undefined resource
250: # on the bottom because $self->{HERE} isn't defined yet, and we
251: # want the src for the map anyhow)
252: foreach (@$stack) {
253: if (defined($_)) { $res = $_; }
254: }
255:
256: return $res->src();
257: }
258:
259: # Convenience function: This seperates the logic of how to create
260: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
261: # etc.) into a seperate function. It takes a resource object as the
262: # first parameter, and the part number of the resource as the second.
263: # It's basically a big switch statement on the status of the resource.
264:
265: sub getDescription {
266: my $res = shift;
267: my $part = shift;
268: my $status = $res->status($part);
269:
270: if ($status == $res->NETWORK_FAILURE) { return ""; }
271: if ($status == $res->NOTHING_SET) {
272: return "Not currently assigned.";
273: }
274: if ($status == $res->OPEN_LATER) {
275: return "Open " . timeToHumanString($res->opendate($part));
276: }
277: if ($status == $res->OPEN) {
278: if ($res->duedate($part)) {
279: return "Due " . timeToHumanString($res->duedate($part));
280: } else {
281: return "Open, no due date";
282: }
283: }
284: if ($status == $res->PAST_DUE_ANSWER_LATER) {
285: return "Answer open " . timeToHumanString($res->answerdate($part));
286: }
287: if ($status == $res->PAST_DUE_NO_ANSWER) {
288: return "Was due " . timeToHumanString($res->duedate($part));
289: }
290: if ($status == $res->ANSWER_OPEN) {
291: return "Answer available";
292: }
293: if ($status == $res->EXCUSED) {
294: return "Excused by instructor";
295: }
296: if ($status == $res->ATTEMPTED) {
297: return "Not yet graded.";
298: }
299: if ($status == $res->TRIES_LEFT) {
300: my $tries = $res->tries($part);
301: my $maxtries = $res->maxtries($part);
302: my $triesString = "";
303: if ($tries && $maxtries) {
304: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
305: if ($maxtries > 1 && $maxtries - $tries == 1) {
306: $triesString = "<b>$triesString</b>";
307: }
308: }
309: if ($res->duedate()) {
310: return "Due " . timeToHumanString($res->duedate($part)) .
311: " $triesString";
312: } else {
313: return "No due date $triesString";
314: }
315: }
316: }
317:
318: # Convenience function, so others can use it: Is the problem due in less then
319: # 24 hours, and still can be done?
320:
321: sub dueInLessThen24Hours {
322: my $res = shift;
323: my $part = shift;
324: my $status = $res->status($part);
325:
326: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
327: $status == $res->TRIES_LEFT()) &&
328: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
329: $res->duedate() > time();
330: }
331:
332: # Convenience function, so others can use it: Is there only one try remaining for the
333: # part, with more then one try to begin with, not due yet and still can be done?
334: sub lastTry {
335: my $res = shift;
336: my $part = shift;
337:
338: my $tries = $res->tries($part);
339: my $maxtries = $res->maxtries($part);
340: return $tries && $maxtries && $maxtries > 1 &&
341: $maxtries - $tries == 1 && $res->duedate() &&
342: $res->duedate() > time();
343: }
344:
345: # This puts a human-readable name on the ENV variable.
346:
347: sub advancedUser {
348: return $ENV{'request.role.adv'};
349: }
350:
351:
352: # timeToHumanString takes a time number and converts it to a
353: # human-readable representation, meant to be used in the following
354: # manner:
355: # print "Due $timestring"
356: # print "Open $timestring"
357: # print "Answer available $timestring"
358: # Very, very, very, VERY English-only... goodness help a localizer on
359: # this func...
360: sub timeToHumanString {
361: my ($time) = @_;
362: # zero, '0' and blank are bad times
363: if (!$time) {
364: return 'never';
365: }
366:
367: my $now = time();
368:
369: my @time = localtime($time);
370: my @now = localtime($now);
371:
372: # Positive = future
373: my $delta = $time - $now;
374:
375: my $minute = 60;
376: my $hour = 60 * $minute;
377: my $day = 24 * $hour;
378: my $week = 7 * $day;
379: my $inPast = 0;
380:
381: # Logic in comments:
382: # Is it now? (extremely unlikely)
383: if ( $delta == 0 ) {
384: return "this instant";
385: }
386:
387: if ($delta < 0) {
388: $inPast = 1;
389: $delta = -$delta;
390: }
391:
392: if ( $delta > 0 ) {
393:
394: my $tense = $inPast ? " ago" : "";
395: my $prefix = $inPast ? "" : "in ";
396:
397: # Less then a minute
398: if ( $delta < $minute ) {
399: if ($delta == 1) { return "${prefix}1 second$tense"; }
400: return "$prefix$delta seconds$tense";
401: }
402:
403: # Less then an hour
404: if ( $delta < $hour ) {
405: # If so, use minutes
406: my $minutes = floor($delta / 60);
407: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
408: return "$prefix$minutes minutes$tense";
409: }
410:
411: # Is it less then 24 hours away? If so,
412: # display hours + minutes
413: if ( $delta < $hour * 24) {
414: my $hours = floor($delta / $hour);
415: my $minutes = floor(($delta % $hour) / $minute);
416: my $hourString = "$hours hours";
417: my $minuteString = ", $minutes minutes";
418: if ($hours == 1) {
419: $hourString = "1 hour";
420: }
421: if ($minutes == 1) {
422: $minuteString = ", 1 minute";
423: }
424: if ($minutes == 0) {
425: $minuteString = "";
426: }
427: return "$prefix$hourString$minuteString$tense";
428: }
429:
430: # Less then 5 days away, display day of the week and
431: # HH:MM
432: if ( $delta < $day * 5 ) {
433: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
434: $timeStr =~ s/12:00 am/midnight/;
435: $timeStr =~ s/12:00 pm/noon/;
436: return ($inPast ? "last " : "next ") .
437: $timeStr;
438: }
439:
440: # Is it this year?
441: if ( $time[5] == $now[5]) {
442: # Return on Month Day, HH:MM meridian
443: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
444: $timeStr =~ s/12:00 am/midnight/;
445: $timeStr =~ s/12:00 pm/noon/;
446: return $timeStr;
447: }
448:
449: # Not this year, so show the year
450: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
451: $timeStr =~ s/12:00 am/midnight/;
452: $timeStr =~ s/12:00 pm/noon/;
453: return $timeStr;
454: }
455: }
456:
457:
458: =pod
459:
460: =head1 NAME
461:
462: Apache::lonnavmap - Subroutines to handle and render the navigation maps
463:
464: =head1 SYNOPSIS
465:
466: The main handler generates the navigational listing for the course,
467: the other objects export this information in a usable fashion for
468: other modules
469:
470: =head1 Object: render
471:
472: The navmap renderer package provides a sophisticated rendering of the
473: standard navigation maps interface into HTML. The provided nav map
474: handler is actually just a glorified call to this.
475:
476: Because of the large number of parameters this function presents,
477: instead of passing it arguments as is normal, pass it in an anonymous
478: hash with the given options. This is because there is no obvious order
479: you may wish to override these in and a hash is easier to read and
480: understand then "undef, undef, undef, 1, undef, undef, renderButton,
481: undef, 0" when you mostly want default behaviors.
482:
483: The package provides a function called 'render', called as
484: Apache::lonnavmaps::renderer->render({}).
485:
486: =head2 Overview of Columns
487:
488: The renderer will build an HTML table for the navmap and return
489: it. The table is consists of several columns, and a row for each
490: resource (or possibly each part). You tell the renderer how many
491: columns to create and what to place in each column, optionally using
492: one or more of the preparent columns, and the renderer will assemble
493: the table.
494:
495: Any additional generally useful column types should be placed in the
496: renderer code here, so anybody can use it anywhere else. Any code
497: specific to the current application (such as the addition of <input>
498: elements in a column) should be placed in the code of the thing using
499: the renderer.
500:
501: At the core of the renderer is the array reference COLS (see Example
502: section below for how to pass this correctly). The COLS array will
503: consist of entries of one of two types of things: Either an integer
504: representing one of the pre-packaged column types, or a sub reference
505: that takes a resource reference, a part number, and a reference to the
506: argument hash passed to the renderer, and returns a string that will
507: be inserted into the HTML representation as it.
508:
509: The pre-packaged column names are refered to by constants in the
510: Apache::lonnavmaps::renderer namespace. The following currently exist:
511:
512: =over 4
513:
514: =item * B<resource>:
515:
516: The general info about the resource: Link, icon for the type, etc. The
517: first column in the standard nav map display. This column also accepts
518: the following parameter in the renderer hash:
519:
520: =over 4
521:
522: =item * B<resource_nolink>:
523:
524: If true, the resource will not be linked. Default: false, resource
525: will have links.
526:
527: =item * B<resource_part_count>:
528:
529: If true (default), the resource will show a part count if the full
530: part list is not displayed. If false, the resource will never show a
531: part count.
532:
533: =item * B<resource_no_folder_link>:
534:
535: If true, the resource's folder will not be clickable to open or close
536: it. Default is false. True implies printCloseAll is false, since you
537: can't close or open folders when this is on anyhow.
538:
539: =back
540:
541: =item B<communication_status>:
542:
543: Whether there is discussion on the resource, email for the user, or
544: (lumped in here) perl errors in the execution of the problem. This is
545: the second column in the main nav map.
546:
547: =item B<quick_status>:
548:
549: An icon for the status of a problem, with four possible states:
550: Correct, incorrect, open, or none (not open yet, not a problem). The
551: third column of the standard navmap.
552:
553: =item B<long_status>:
554:
555: A text readout of the details of the current status of the problem,
556: such as "Due in 22 hours". The fourth column of the standard navmap.
557:
558: =back
559:
560: If you add any others please be sure to document them here.
561:
562: An example of a column renderer that will show the ID number of a
563: resource, along with the part name if any:
564:
565: sub {
566: my ($resource, $part, $params) = @_;
567: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
568: return '<td>' . $resource->{ID} . '</td>';
569: }
570:
571: Note these functions are responsible for the TD tags, which allow them
572: to override vertical and horizontal alignment, etc.
573:
574: =head2 Parameters
575:
576: Most of these parameters are only useful if you are *not* using the
577: folder interface (i.e., the default first column), which is probably
578: the common case. If you are using this interface, then you should be
579: able to get away with just using 'cols' (to specify the columns
580: shown), 'url' (necessary for the folders to link to the current screen
581: correctly), and possibly 'queryString' if your app calls for it. In
582: that case, maintaining the state of the folders will be done
583: automatically.
584:
585: =over 4
586:
587: =item * B<iterator>:
588:
589: A reference to a fresh ::iterator to use from the navmaps. The
590: rendering will reflect the options passed to the iterator, so you can
591: use that to just render a certain part of the course, if you like. If
592: one is not passed, the renderer will attempt to construct one from
593: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
594: 'iterator_map' parameter if any.
595:
596: =item * B<iterator_map>:
597:
598: If you are letting the renderer do the iterator handling, you can
599: instruct the renderer to render only a particular map by passing it
600: the source of the map you want to process, like
601: '/res/103/jerf/navmap.course.sequence'.
602:
603: =item * B<navmap>:
604:
605: A reference to a navmap, used only if an iterator is not passed in. If
606: this is necessary to make an iterator but it is not passed in, a new
607: one will be constructed based on ENV info. This is useful to do basic
608: error checking before passing it off to render.
609:
610: =item * B<r>:
611:
612: The standard Apache response object. This must be passed to the
613: renderer or the course hash will be locked.
614:
615: =item * B<cols>:
616:
617: An array reference
618:
619: =item * B<showParts>:
620:
621: A flag. If yes (default), a line for the resource itself, and a line
622: for each part will be displayed. If not, only one line for each
623: resource will be displayed.
624:
625: =item * B<condenseParts>:
626:
627: A flag. If yes (default), if all parts of the problem have the same
628: status and that status is Nothing Set, Correct, or Network Failure,
629: then only one line will be displayed for that resource anyhow. If no,
630: all parts will always be displayed. If showParts is 0, this is
631: ignored.
632:
633: =item * B<jumpCount>:
634:
635: A string identifying the URL to place the anchor 'curloc' at. Default
636: to no anchor at all. It is the responsibility of the renderer user to
637: ensure that the #curloc is in the URL. By default, determined through
638: the use of the ENV{} 'jump' information, and should normally "just
639: work" correctly.
640:
641: =item * B<here>:
642:
643: A Symb identifying where to place the 'here' marker. Default empty,
644: which means no marker.
645:
646: =item * B<indentString>:
647:
648: A string identifying the indentation string to use. By default, this
649: is a 25 pixel whitespace image with no alt text.
650:
651: =item * B<queryString>:
652:
653: A string which will be prepended to the query string used when the
654: folders are opened or closed.
655:
656: =item * B<url>:
657:
658: The url the folders will link to, which should be the current
659: page. Required if the resource info column is shown.
660:
661: =item * B<currentJumpIndex>:
662:
663: Describes the currently-open row number to cause the browser to jump
664: to, because the user just opened that folder. By default, pulled from
665: the Jump information in the ENV{'form.*'}.
666:
667: =item * B<printKey>:
668:
669: If true, print the key that appears on the top of the standard
670: navmaps. Default is false.
671:
672: =item * B<printCloseAll>:
673:
674: If true, print the "Close all folders" or "open all folders"
675: links. Default is true.
676:
677: =item * B<filterFunc>:
678:
679: A function that takes the resource object as its only parameter and
680: returns a true or false value. If true, the resource is displayed. If
681: false, it is simply skipped in the display. By default, all resources
682: are shown.
683:
684: =item * B<suppressNavmaps>:
685:
686: If true, will not display Navigate Content resources. Default to
687: false.
688:
689: =back
690:
691: =head2 Additional Info
692:
693: In addition to the parameters you can pass to the renderer, which will
694: be passed through unchange to the column renderers, the renderer will
695: generate the following information which your renderer may find
696: useful:
697:
698: If you want to know how many rows were printed, the 'counter' element
699: of the hash passed into the render function will contain the
700: count. You may want to check whether any resources were printed at
701: all.
702:
703: =over 4
704:
705: =back
706:
707: =cut
708:
709: sub resource { return 0; }
710: sub communication_status { return 1; }
711: sub quick_status { return 2; }
712: sub long_status { return 3; }
713:
714: # Data for render_resource
715:
716: sub render_resource {
717: my ($resource, $part, $params) = @_;
718:
719: my $nonLinkedText = ''; # stuff after resource title not in link
720:
721: my $link = $params->{"resourceLink"};
722: my $src = $resource->src();
723: my $it = $params->{"iterator"};
724: my $filter = $it->{FILTER};
725:
726: my $title = $resource->compTitle();
727: if ($src =~ /^\/uploaded\//) {
728: $nonLinkedText=$title;
729: $title = '';
730: }
731: my $partLabel = "";
732: my $newBranchText = "";
733:
734: # If this is a new branch, label it so
735: if ($params->{'isNewBranch'}) {
736: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
737: }
738:
739: # links to open and close the folder
740: my $linkopen = "<a href='$link'>";
741: my $linkclose = "</a>";
742:
743: # Default icon: HTML page
744: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
745:
746: if ($resource->is_problem()) {
747: if ($part eq "" || $params->{'condensed'}) {
748: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
749: } else {
750: $icon = $params->{'indentString'};
751: }
752: }
753:
754: # Display the correct map icon to open or shut map
755: if ($resource->is_map()) {
756: my $mapId = $resource->map_pc();
757: my $nowOpen = !defined($filter->{$mapId});
758: if ($it->{CONDITION}) {
759: $nowOpen = !$nowOpen;
760: }
761:
762: if (!$params->{'resource_no_folder_link'}) {
763: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
764: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
765:
766: $linkopen = "<a href='" . $params->{'url'} . '?' .
767: $params->{'queryString'} . '&filter=';
768: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
769: addToFilter($filter, $mapId) :
770: removeFromFilter($filter, $mapId);
771: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
772: . $params->{'hereType'} . '&here=' .
773: &Apache::lonnet::escape($params->{'here'}) .
774: '&jump=' .
775: &Apache::lonnet::escape($resource->symb()) .
776: "&folderManip=1'>";
777: } else {
778: # Don't allow users to manipulate folder
779: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') .
780: '.nomanip.gif';
781: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
782:
783: $linkopen = "";
784: $linkclose = "";
785: }
786: }
787:
788: if ($resource->randomout()) {
789: $nonLinkedText .= ' <i>(hidden)</i> ';
790: }
791:
792: # We're done preparing and finally ready to start the rendering
793: my $result = "<td align='left' valign='center'>";
794:
795: my $indentLevel = $params->{'indentLevel'};
796: if ($newBranchText) { $indentLevel--; }
797:
798: # print indentation
799: for (my $i = 0; $i < $indentLevel; $i++) {
800: $result .= $params->{'indentString'};
801: }
802:
803: # Decide what to display
804: $result .= "$newBranchText$linkopen$icon$linkclose";
805:
806: my $curMarkerBegin = '';
807: my $curMarkerEnd = '';
808:
809: # Is this the current resource?
810: if (!$params->{'displayedHereMarker'} &&
811: $resource->symb() eq $params->{'here'} ) {
812: $curMarkerBegin = '<font color="red" size="+2">> </font>';
813: $curMarkerEnd = '<font color="red" size="+2"><</font>';
814: $params->{'displayedHereMarker'} = 1;
815: }
816:
817: if ($resource->is_problem() && $part ne "" &&
818: !$params->{'condensed'}) {
819: $partLabel = " (Part $part)";
820: $title = "";
821: }
822:
823: if ($params->{'condensed'} && $resource->countParts() > 1) {
824: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
825: }
826:
827: if (!$params->{'resource_nolink'}) {
828: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
829: } else {
830: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
831: }
832:
833: return $result;
834: }
835:
836: sub render_communication_status {
837: my ($resource, $part, $params) = @_;
838: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
839:
840: my $link = $params->{"resourceLink"};
841: my $linkopen = "<a href='$link'>";
842: my $linkclose = "</a>";
843:
844: if ($resource->hasDiscussion()) {
845: $discussionHTML = $linkopen .
846: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
847: $linkclose;
848: }
849:
850: if ($resource->getFeedback()) {
851: my $feedback = $resource->getFeedback();
852: foreach (split(/\,/, $feedback)) {
853: if ($_) {
854: $feedbackHTML .= ' <a href="/adm/email?display='
855: . &Apache::lonnet::escape($_) . '">'
856: . '<img src="/adm/lonMisc/feedback.gif" '
857: . 'border="0" /></a>';
858: }
859: }
860: }
861:
862: if ($resource->getErrors()) {
863: my $errors = $resource->getErrors();
864: foreach (split(/,/, $errors)) {
865: if ($_) {
866: $errorHTML .= ' <a href="/adm/email?display='
867: . &Apache::lonnet::escape($_) . '">'
868: . '<img src="/adm/lonMisc/bomb.gif" '
869: . 'border="0" /></a>';
870: }
871: }
872: }
873:
874: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
875:
876: }
877: sub render_quick_status {
878: my ($resource, $part, $params) = @_;
879: my $result = "";
880: my $firstDisplayed = !$params->{'condensed'} &&
881: $params->{'multipart'} && $part eq "0";
882:
883: my $link = $params->{"resourceLink"};
884: my $linkopen = "<a href='$link'>";
885: my $linkclose = "</a>";
886:
887: if ($resource->is_problem() &&
888: !$firstDisplayed) {
889: my $icon = $statusIconMap{$resource->status($part)};
890: my $alt = $iconAltTags{$icon};
891: if ($icon) {
892: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
893: } else {
894: $result .= "<td width='30'> </td>\n";
895: }
896: } else { # not problem, no icon
897: $result .= "<td width='30'> </td>\n";
898: }
899:
900: return $result;
901: }
902: sub render_long_status {
903: my ($resource, $part, $params) = @_;
904: my $result = "<td align='right' valign='center'>\n";
905: my $firstDisplayed = !$params->{'condensed'} &&
906: $params->{'multipart'} && $part eq "0";
907:
908: my $color;
909: if ($resource->is_problem()) {
910: $color = $colormap{$resource->status};
911:
912: if (dueInLessThen24Hours($resource, $part) ||
913: lastTry($resource, $part)) {
914: $color = $hurryUpColor;
915: }
916: }
917:
918: if ($resource->kind() eq "res" &&
919: $resource->is_problem() &&
920: !$firstDisplayed) {
921: if ($color) {$result .= "<font color=\"$color\"><b>"; }
922: $result .= getDescription($resource, $part);
923: if ($color) {$result .= "</b></font>"; }
924: }
925: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
926: $result .= '(randomly select ' . $resource->randompick() .')';
927: }
928:
929: $result .= " </td>\n";
930:
931: return $result;
932: }
933:
934: my @preparedColumns = (\&render_resource, \&render_communication_status,
935: \&render_quick_status, \&render_long_status);
936:
937: sub setDefault {
938: my ($val, $default) = @_;
939: if (!defined($val)) { return $default; }
940: return $val;
941: }
942:
943: sub render {
944: my $args = shift;
945: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
946: my $result = '';
947:
948: # Configure the renderer.
949: my $cols = $args->{'cols'};
950: if (!defined($cols)) {
951: # no columns, no nav maps.
952: return '';
953: }
954: my $mustCloseNavMap = 0;
955: my $navmap;
956: if (defined($args->{'navmap'})) {
957: $navmap = $args->{'navmap'};
958: }
959:
960: my $r = $args->{'r'};
961: my $queryString = $args->{'queryString'};
962: my $jump = $args->{'jump'};
963: my $here = $args->{'here'};
964: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
965: my $currentJumpDelta = 2; # change this to change how many resources are displayed
966: # before the current resource when using #current
967:
968: # If we were passed 'here' information, we are not rendering
969: # after a folder manipulation, and we were not passed an
970: # iterator, make sure we open the folders to show the "here"
971: # marker
972: my $filterHash = {};
973: # Figure out what we're not displaying
974: foreach (split(/\,/, $ENV{"form.filter"})) {
975: if ($_) {
976: $filterHash->{$_} = "1";
977: }
978: }
979:
980: my $condition = 0;
981: if ($ENV{'form.condition'}) {
982: $condition = 1;
983: }
984:
985: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
986: # Step 1: Check to see if we have a navmap
987: if (!defined($navmap)) {
988: $navmap = Apache::lonnavmaps::navmap->new(
989: $ENV{"request.course.fn"}.".db",
990: $ENV{"request.course.fn"}."_parms.db", 1, 1);
991: $mustCloseNavMap = 1;
992: }
993: $navmap->init();
994:
995: # Step two: Locate what kind of here marker is necessary
996: # Determine where the "here" marker is and where the screen jumps to.
997:
998: if ($ENV{'form.postsymb'}) {
999: $here = $jump = $ENV{'form.postsymb'};
1000: } elsif ($ENV{'form.postdata'}) {
1001: # couldn't find a symb, is there a URL?
1002: my $currenturl = $ENV{'form.postdata'};
1003: #$currenturl=~s/^http\:\/\///;
1004: #$currenturl=~s/^[^\/]+//;
1005:
1006: $here = $jump = &Apache::lonnet::symbread($currenturl);
1007: }
1008:
1009: # Step three: Ensure the folders are open
1010: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1011: my $depth = 1;
1012: $mapIterator->next(); # discard the first BEGIN_MAP
1013: my $curRes = $mapIterator->next();
1014: my $found = 0;
1015:
1016: # We only need to do this if we need to open the maps to show the
1017: # current position. This will change the counter so we can't count
1018: # for the jump marker with this loop.
1019: while ($depth > 0 && !$found) {
1020: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1021: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1022:
1023: if (ref($curRes) && $curRes->symb() eq $here) {
1024: my $mapStack = $mapIterator->getStack();
1025:
1026: # Ensure the parent maps are open
1027: for my $map (@{$mapStack}) {
1028: if ($condition) {
1029: undef $filterHash->{$map->map_pc()};
1030: } else {
1031: $filterHash->{$map->map_pc()} = 1;
1032: }
1033: }
1034: $found = 1;
1035: }
1036:
1037: $curRes = $mapIterator->next();
1038: }
1039: }
1040:
1041: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1042: # If this is a click on a folder or something, we want to preserve the "here"
1043: # from the querystring, and get the new "jump" marker
1044: $here = $ENV{'form.here'};
1045: $jump = $ENV{'form.jump'};
1046: }
1047:
1048: my $it = $args->{'iterator'};
1049: if (!defined($it)) {
1050: # Construct a default iterator based on $ENV{'form.'} information
1051:
1052: # Step 1: Check to see if we have a navmap
1053: if (!defined($navmap)) {
1054: $navmap = Apache::lonnavmaps::navmap->new($r,
1055: $ENV{"request.course.fn"}.".db",
1056: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1057: $mustCloseNavMap = 1;
1058: }
1059: # Paranoia: Make sure it's ready
1060: $navmap->init();
1061:
1062: # See if we're being passed a specific map
1063: if ($args->{'iterator_map'}) {
1064: my $map = $args->{'iterator_map'};
1065: $map = $navmap->getResourceByUrl($map);
1066: my $firstResource = $map->map_start();
1067: my $finishResource = $map->map_finish();
1068:
1069: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1070: } else {
1071: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1072: }
1073: }
1074:
1075: # (re-)Locate the jump point, if any
1076: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1077: my $depth = 1;
1078: $mapIterator->next();
1079: my $curRes = $mapIterator->next();
1080: my $foundJump = 0;
1081: my $counter = 0;
1082:
1083: while ($depth > 0 && !$foundJump) {
1084: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1085: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1086: if (ref($curRes)) { $counter++; }
1087:
1088: if (ref($curRes) && $jump eq $curRes->symb()) {
1089:
1090: # This is why we have to use the main iterator instead of the
1091: # potentially faster DFS: The count has to be the same, so
1092: # the order has to be the same, which DFS won't give us.
1093: $args->{'currentJumpIndex'} = $counter;
1094: $foundJump = 1;
1095: }
1096:
1097: $curRes = $mapIterator->next();
1098: }
1099:
1100: my $showParts = setDefault($args->{'showParts'}, 1);
1101: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1102: # keeps track of when the current resource is found,
1103: # so we can back up a few and put the anchor above the
1104: # current resource
1105: my $printKey = $args->{'printKey'};
1106: my $printCloseAll = $args->{'printCloseAll'};
1107: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1108: my $filterFunc = setDefault($args->{'filterFunc'},
1109: sub {return 1;});
1110:
1111: # Print key?
1112: if ($printKey) {
1113: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1114: my $date=localtime;
1115: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1116: if ($navmap->{LAST_CHECK}) {
1117: $result .=
1118: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1119: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1120: '</td><td align="center" valign="bottom"> '.
1121: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
1122: '</td>';
1123: } else {
1124: $result .= '<td align="center" valign="bottom"> '.
1125: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
1126: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
1127: '</td>';
1128: }
1129:
1130: $result .= '</tr></table>';
1131: }
1132:
1133: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1134: if ($condition) {
1135: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1136: "&here=" . Apache::lonnet::escape($here) .
1137: "\">Close All Folders</a>";
1138: } else {
1139: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1140: "&here=" . Apache::lonnet::escape($here) .
1141: "\">Open All Folders</a>";
1142: }
1143: $result .= "<br /><br />\n";
1144: }
1145:
1146: if ($r) {
1147: $r->print($result);
1148: $r->rflush();
1149: $result = "";
1150: }
1151: # End parameter setting
1152:
1153: # Data
1154: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1155: my $res = "Apache::lonnavmaps::resource";
1156: my %condenseStatuses =
1157: ( $res->NETWORK_FAILURE => 1,
1158: $res->NOTHING_SET => 1,
1159: $res->CORRECT => 1 );
1160: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1161:
1162: # Shared variables
1163: $args->{'counter'} = 0; # counts the rows
1164: $args->{'indentLevel'} = 0;
1165: $args->{'isNewBranch'} = 0;
1166: $args->{'condensed'} = 0;
1167: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1168: $args->{'displayedHereMarker'} = 0;
1169:
1170: my $displayedJumpMarker = 0;
1171: # Set up iteration.
1172: $depth = 1;
1173: $it->next(); # discard initial BEGIN_MAP
1174: $curRes = $it->next();
1175: my $now = time();
1176: my $in24Hours = $now + 24 * 60 * 60;
1177: my $rownum = 0;
1178:
1179: # export "here" marker information
1180: $args->{'here'} = $here;
1181:
1182: while ($depth > 0) {
1183: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1184: if ($curRes == $it->END_MAP()) { $depth--; }
1185:
1186: # Maintain indentation level.
1187: if ($curRes == $it->BEGIN_MAP() ||
1188: $curRes == $it->BEGIN_BRANCH() ) {
1189: $args->{'indentLevel'}++;
1190: }
1191: if ($curRes == $it->END_MAP() ||
1192: $curRes == $it->END_BRANCH() ) {
1193: $args->{'indentLevel'}--;
1194: }
1195: # Notice new branches
1196: if ($curRes == $it->BEGIN_BRANCH()) {
1197: $args->{'isNewBranch'} = 1;
1198: }
1199:
1200: # If this isn't an actual resource, continue on
1201: if (!ref($curRes)) {
1202: next;
1203: }
1204:
1205: $args->{'counter'}++;
1206:
1207: # If this has been filtered out, continue on
1208: if (!(&$filterFunc($curRes))) {
1209: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1210: next;
1211: }
1212:
1213: # If we're suppressing navmaps and this is a navmap, continue on
1214: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1215: next;
1216: }
1217:
1218: # Does it have multiple parts?
1219: $args->{'multipart'} = 0;
1220: $args->{'condensed'} = 0;
1221: my @parts;
1222:
1223: # Decide what parts to show.
1224: if ($curRes->is_problem() && $showParts) {
1225: @parts = @{$curRes->parts()};
1226: $args->{'multipart'} = scalar(@parts) > 1;
1227:
1228: if ($condenseParts) { # do the condensation
1229: if (!$curRes->opendate("0")) {
1230: @parts = ();
1231: $args->{'condensed'} = 1;
1232: }
1233: if (!$args->{'condensed'}) {
1234: # Decide whether to condense based on similarity
1235: my $status = $curRes->status($parts[1]);
1236: my $due = $curRes->duedate($parts[1]);
1237: my $open = $curRes->opendate($parts[1]);
1238: my $statusAllSame = 1;
1239: my $dueAllSame = 1;
1240: my $openAllSame = 1;
1241: for (my $i = 2; $i < scalar(@parts); $i++) {
1242: if ($curRes->status($parts[$i]) != $status){
1243: $statusAllSame = 0;
1244: }
1245: if ($curRes->duedate($parts[$i]) != $due ) {
1246: $dueAllSame = 0;
1247: }
1248: if ($curRes->opendate($parts[$i]) != $open) {
1249: $openAllSame = 0;
1250: }
1251: }
1252: # $*allSame is true if all the statuses were
1253: # the same. Now, if they are all the same and
1254: # match one of the statuses to condense, or they
1255: # are all open with the same due date, or they are
1256: # all OPEN_LATER with the same open date, display the
1257: # status of the first non-zero part (to get the 'correct'
1258: # status right, since 0 is never 'correct' or 'open').
1259: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1260: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1261: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1262: @parts = ();
1263: $args->{'condensed'} = 1;
1264: }
1265:
1266: }
1267: }
1268: }
1269:
1270: # If the multipart problem was condensed, "forget" it was multipart
1271: if (scalar(@parts) == 1) {
1272: $args->{'multipart'} = 0;
1273: }
1274:
1275: # Now, we've decided what parts to show. Loop through them and
1276: # show them.
1277: foreach my $part ('', @parts) {
1278: if ($part eq '0') {
1279: next;
1280: }
1281: $rownum ++;
1282: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1283:
1284: $result .= " <tr bgcolor='$backgroundColor'>\n";
1285:
1286: # Set up some data about the parts that the cols might want
1287: my $filter = $it->{FILTER};
1288: my $stack = $it->getStack();
1289: my $src = getLinkForResource($stack);
1290:
1291: my $srcHasQuestion = $src =~ /\?/;
1292: $args->{"resourceLink"} = $src.
1293: ($srcHasQuestion?'&':'?') .
1294: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1295:
1296: # Now, display each column.
1297: foreach my $col (@$cols) {
1298: my $colHTML = '';
1299: if (ref($col)) {
1300: $colHTML .= &$col($curRes, $part, $args);
1301: } else {
1302: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1303: }
1304:
1305: # If this is the first column and it's time to print
1306: # the anchor, do so
1307: if ($col == $cols->[0] &&
1308: $args->{'counter'} == $args->{'currentJumpIndex'} -
1309: $currentJumpDelta) {
1310: # Jam the anchor after the <td> tag;
1311: # necessary for valid HTML (which Mozilla requires)
1312: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1313: $displayedJumpMarker = 1;
1314: }
1315: $result .= $colHTML . "\n";
1316: }
1317: $result .= " </tr>\n";
1318: $args->{'isNewBranch'} = 0;
1319: }
1320:
1321: if ($r && $rownum % 20 == 0) {
1322: $r->print($result);
1323: $result = "";
1324: $r->rflush();
1325: }
1326: } continue {
1327: $curRes = $it->next();
1328: }
1329:
1330: # Print out the part that jumps to #curloc if it exists
1331: # delay needed because the browser is processing the jump before
1332: # it finishes rendering, so it goes to the wrong place!
1333: # onload might be better, but this routine has no access to that.
1334: # On mozilla, the 0-millisecond timeout seems to prevent this;
1335: # it's quite likely this might fix other browsers, too, and
1336: # certainly won't hurt anything.
1337: if ($displayedJumpMarker) {
1338: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1339: }
1340:
1341: $result .= "</table>";
1342:
1343: if ($r) {
1344: $r->print($result);
1345: $result = "";
1346: $r->rflush();
1347: }
1348:
1349: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1350:
1351: return $result;
1352: }
1353:
1354: 1;
1355:
1356: package Apache::lonnavmaps::navmap;
1357:
1358: =pod
1359:
1360: lonnavmaps provides functions and objects for dealing with the
1361: compiled course hashes generated when a user enters the course, the
1362: Apache handler for the "Navigation Map" button, and a flexible
1363: prepared renderer for navigation maps that are easy to use anywhere.
1364:
1365: =head1 Object: navmap
1366:
1367: Encapsulating the compiled nav map
1368:
1369: navmap is an object that encapsulates a compiled course map and
1370: provides a reasonable interface to it.
1371:
1372: Most notably it provides a way to navigate the map sensibly and a
1373: flexible iterator that makes it easy to write various renderers based
1374: on nav maps.
1375:
1376: You must obtain resource objects through the navmap object.
1377:
1378: =head2 Methods
1379:
1380: =over 4
1381:
1382: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
1383: genMailDiscussStatus):
1384:
1385: Binds a new navmap object to the compiled nav map hash and parm hash
1386: given as filenames. genCourseAndUserOptions is a flag saying whether
1387: the course options and user options hash should be generated. This is
1388: for when you are using the parameters of the resources that require
1389: them; see documentation in resource object
1390: documentation. genMailDiscussStatus causes the nav map to retreive
1391: information about the email and discussion status of
1392: resources. Returns the navmap object if this is successful, or
1393: B<undef> if not. You must check for undef; errors will occur when you
1394: try to use the other methods otherwise.
1395:
1396: =item * B<getIterator>(first, finish, filter, condition):
1397:
1398: See iterator documentation below.
1399:
1400: =cut
1401:
1402: use strict;
1403: use GDBM_File;
1404:
1405: sub new {
1406: # magic invocation to create a class instance
1407: my $proto = shift;
1408: my $class = ref($proto) || $proto;
1409: my $self = {};
1410:
1411: $self->{NAV_HASH_FILE} = shift;
1412: $self->{PARM_HASH_FILE} = shift;
1413: $self->{GENERATE_COURSE_USER_OPT} = shift;
1414: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1415:
1416: # Resource cache stores navmap resources as we reference them. We generate
1417: # them on-demand so we don't pay for creating resources unless we use them.
1418: $self->{RESOURCE_CACHE} = {};
1419:
1420: # Network failure flag, if we accessed the course or user opt and
1421: # failed
1422: $self->{NETWORK_FAILURE} = 0;
1423:
1424: # tie the nav hash
1425:
1426: my %navmaphash;
1427: my %parmhash;
1428: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1429: &GDBM_READER(), 0640))) {
1430: return undef;
1431: }
1432:
1433: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1434: &GDBM_READER(), 0640)))
1435: {
1436: untie %{$self->{PARM_HASH}};
1437: return undef;
1438: }
1439:
1440: $self->{NAV_HASH} = \%navmaphash;
1441: $self->{PARM_HASH} = \%parmhash;
1442: $self->{INITED} = 0;
1443:
1444: bless($self);
1445:
1446: return $self;
1447: }
1448:
1449: sub init {
1450: my $self = shift;
1451: if ($self->{INITED}) { return; }
1452:
1453: # If the course opt hash and the user opt hash should be generated,
1454: # generate them
1455: if ($self->{GENERATE_COURSE_USER_OPT}) {
1456: my $uname=$ENV{'user.name'};
1457: my $udom=$ENV{'user.domain'};
1458: my $uhome=$ENV{'user.home'};
1459: my $cid=$ENV{'request.course.id'};
1460: my $chome=$ENV{'course.'.$cid.'.home'};
1461: my ($cdom,$cnum)=split(/\_/,$cid);
1462:
1463: my $userprefix=$uname.'_'.$udom.'_';
1464:
1465: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1466: unless ($uhome eq 'no_host') {
1467: # ------------------------------------------------- Get coursedata (if present)
1468: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1469: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1470: ':resourcedata',$chome);
1471: if ($reply!~/^error\:/) {
1472: $courserdatas{$cid}=$reply;
1473: $courserdatas{$cid.'.last_cache'}=time;
1474: }
1475: # check to see if network failed
1476: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1477: {
1478: $self->{NETWORK_FAILURE} = 1;
1479: }
1480: }
1481: foreach (split(/\&/,$courserdatas{$cid})) {
1482: my ($name,$value)=split(/\=/,$_);
1483: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1484: &Apache::lonnet::unescape($value);
1485: }
1486: # --------------------------------------------------- Get userdata (if present)
1487: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1488: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1489: if ($reply!~/^error\:/) {
1490: $userrdatas{$uname.'___'.$udom}=$reply;
1491: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1492: }
1493: # check to see if network failed
1494: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1495: {
1496: $self->{NETWORK_FAILURE} = 1;
1497: }
1498: }
1499: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1500: my ($name,$value)=split(/\=/,$_);
1501: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1502: &Apache::lonnet::unescape($value);
1503: }
1504: $self->{COURSE_OPT} = \%courseopt;
1505: $self->{USER_OPT} = \%useropt;
1506: }
1507: }
1508:
1509: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1510: my $cid=$ENV{'request.course.id'};
1511: my ($cdom,$cnum)=split(/\_/,$cid);
1512:
1513: my %emailstatus = &Apache::lonnet::dump('email_status');
1514: my $logoutTime = $emailstatus{'logout'};
1515: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1516: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1517: $courseLeaveTime : $logoutTime);
1518: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1519: $cdom, $cnum);
1520: my %feedback=();
1521: my %error=();
1522: my $keys = &Apache::lonnet::reply('keys:'.
1523: $ENV{'user.domain'}.':'.
1524: $ENV{'user.name'}.':nohist_email',
1525: $ENV{'user.home'});
1526:
1527: foreach my $msgid (split(/\&/, $keys)) {
1528: $msgid=&Apache::lonnet::unescape($msgid);
1529: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1530: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1531: my ($what,$url)=($1,$2);
1532: my %status=
1533: &Apache::lonnet::get('email_status',[$msgid]);
1534: if ($status{$msgid}=~/^error\:/) {
1535: $status{$msgid}='';
1536: }
1537:
1538: if (($status{$msgid} eq 'new') ||
1539: (!$status{$msgid})) {
1540: if ($what eq 'Error') {
1541: $error{$url}.=','.$msgid;
1542: } else {
1543: $feedback{$url}.=','.$msgid;
1544: }
1545: }
1546: }
1547: }
1548:
1549: $self->{FEEDBACK} = \%feedback;
1550: $self->{ERROR_MSG} = \%error; # what is this? JB
1551: $self->{DISCUSSION_TIME} = \%discussiontime;
1552: $self->{EMAIL_STATUS} = \%emailstatus;
1553:
1554: }
1555:
1556: $self->{PARM_CACHE} = {};
1557: $self->{INITED} = 1;
1558: }
1559:
1560: # Internal function: Takes a key to look up in the nav hash and implements internal
1561: # memory caching of that key.
1562: sub navhash {
1563: my $self = shift; my $key = shift;
1564: return $self->{NAV_HASH}->{$key};
1565: }
1566:
1567: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1568: sub courseMapDefined {
1569: my $self = shift;
1570: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1571:
1572: my $firstres = $self->navhash("map_start_$uri");
1573: my $lastres = $self->navhash("map_finish_$uri");
1574: return $firstres && $lastres;
1575: }
1576:
1577: sub getIterator {
1578: my $self = shift;
1579: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1580: shift, undef, shift);
1581: return $iterator;
1582: }
1583:
1584: # unties the hash when done
1585: sub untieHashes {
1586: my $self = shift;
1587: untie %{$self->{NAV_HASH}};
1588: untie %{$self->{PARM_HASH}};
1589: }
1590:
1591: # Private method: Does the given resource (as a symb string) have
1592: # current discussion? Returns 0 if chat/mail data not extracted.
1593: sub hasDiscussion {
1594: my $self = shift;
1595: my $symb = shift;
1596: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1597:
1598: #return defined($self->{DISCUSSION_TIME}->{$symb});
1599: return $self->{DISCUSSION_TIME}->{$symb} >
1600: $self->{LAST_CHECK};
1601: }
1602:
1603: # Private method: Does the given resource (as a symb string) have
1604: # current feedback? Returns the string in the feedback hash, which
1605: # will be false if it does not exist.
1606: sub getFeedback {
1607: my $self = shift;
1608: my $symb = shift;
1609:
1610: if (!defined($self->{FEEDBACK})) { return ""; }
1611:
1612: return $self->{FEEDBACK}->{$symb};
1613: }
1614:
1615: # Private method: Get the errors for that resource (by source).
1616: sub getErrors {
1617: my $self = shift;
1618: my $src = shift;
1619:
1620: if (!defined($self->{ERROR_MSG})) { return ""; }
1621: return $self->{ERROR_MSG}->{$src};
1622: }
1623:
1624: =pod
1625:
1626: =item * B<getById>(id):
1627:
1628: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1629: object for that resource. This method, or other methods that use it
1630: (as in the resource object) is the only proper way to obtain a
1631: resource object.
1632:
1633: =cut
1634:
1635: # The strategy here is to cache the resource objects, and only construct them
1636: # as we use them. The real point is to prevent reading any more from the tied
1637: # hash then we have to, which should hopefully alleviate speed problems.
1638: # Caching is just an incidental detail I throw in because it makes sense.
1639:
1640: sub getById {
1641: my $self = shift;
1642: my $id = shift;
1643:
1644: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1645: {
1646: return $self->{RESOURCE_CACHE}->{$id};
1647: }
1648:
1649: # resource handles inserting itself into cache.
1650: # Not clear why the quotes are necessary, but as of this
1651: # writing it doesn't work without them.
1652: return "Apache::lonnavmaps::resource"->new($self, $id);
1653: }
1654:
1655: sub getBySymb {
1656: my $self = shift;
1657: my $symb = shift;
1658: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1659: my $map = $self->getResourceByUrl($mapUrl);
1660: return $self->getById($map->map_pc() . '.' . $id);
1661: }
1662:
1663: =pod
1664:
1665: =item * B<firstResource>():
1666:
1667: Returns a resource object reference corresponding to the first
1668: resource in the navmap.
1669:
1670: =cut
1671:
1672: sub firstResource {
1673: my $self = shift;
1674: my $firstResource = $self->navhash('map_start_' .
1675: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1676: return $self->getById($firstResource);
1677: }
1678:
1679: =pod
1680:
1681: =item * B<finishResource>():
1682:
1683: Returns a resource object reference corresponding to the last resource
1684: in the navmap.
1685:
1686: =cut
1687:
1688: sub finishResource {
1689: my $self = shift;
1690: my $firstResource = $self->navhash('map_finish_' .
1691: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1692: return $self->getById($firstResource);
1693: }
1694:
1695: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1696: # the actual lookup; parmval caches the results.
1697: sub parmval {
1698: my $self = shift;
1699: my ($what,$symb)=@_;
1700: my $hashkey = $what."|||".$symb;
1701:
1702: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1703: return $self->{PARM_CACHE}->{$hashkey};
1704: }
1705:
1706: my $result = $self->parmval_real($what, $symb);
1707: $self->{PARM_CACHE}->{$hashkey} = $result;
1708: return $result;
1709: }
1710:
1711: sub parmval_real {
1712: my $self = shift;
1713: my ($what,$symb) = @_;
1714:
1715: my $cid=$ENV{'request.course.id'};
1716: my $csec=$ENV{'request.course.sec'};
1717: my $uname=$ENV{'user.name'};
1718: my $udom=$ENV{'user.domain'};
1719:
1720: unless ($symb) { return ''; }
1721: my $result='';
1722:
1723: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1724:
1725: # ----------------------------------------------------- Cascading lookup scheme
1726: my $rwhat=$what;
1727: $what=~s/^parameter\_//;
1728: $what=~s/\_/\./;
1729:
1730: my $symbparm=$symb.'.'.$what;
1731: my $mapparm=$mapname.'___(all).'.$what;
1732: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1733:
1734: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1735: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1736: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1737:
1738: my $courselevel= $usercourseprefix.'.'.$what;
1739: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1740: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1741:
1742: my $useropt = $self->{USER_OPT};
1743: my $courseopt = $self->{COURSE_OPT};
1744: my $parmhash = $self->{PARM_HASH};
1745:
1746: # ---------------------------------------------------------- first, check user
1747: if ($uname and defined($useropt)) {
1748: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1749: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1750: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1751: }
1752:
1753: # ------------------------------------------------------- second, check course
1754: if ($csec and defined($courseopt)) {
1755: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1756: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1757: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1758: }
1759:
1760: if (defined($courseopt)) {
1761: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1762: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1763: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1764: }
1765:
1766: # ----------------------------------------------------- third, check map parms
1767:
1768: my $thisparm=$$parmhash{$symbparm};
1769: if (defined($thisparm)) { return $thisparm; }
1770:
1771: # ----------------------------------------------------- fourth , check default
1772:
1773: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1774: if (defined($default)) { return $default}
1775:
1776: # --------------------------------------------------- fifth , cascade up parts
1777:
1778: my ($space,@qualifier)=split(/\./,$rwhat);
1779: my $qualifier=join('.',@qualifier);
1780: unless ($space eq '0') {
1781: my @parts=split(/_/,$space);
1782: my $id=pop(@parts);
1783: my $part=join('_',@parts);
1784: if ($part eq '') { $part='0'; }
1785: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1786: if (defined($partgeneral)) { return $partgeneral; }
1787: }
1788: return '';
1789: }
1790:
1791: =pod
1792:
1793: =item * B<getResourceByUrl>(url):
1794:
1795: Retrieves a resource object by URL of the resource. If passed a
1796: resource object, it will simply return it, so it is safe to use this
1797: method in code like "$res = $navmap->getResourceByUrl($res)", if
1798: you're not sure if $res is already an object, or just a URL. If the
1799: resource appears multiple times in the course, only the first instance
1800: will be returned. As a result, this is probably useful only for maps.
1801:
1802: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
1803:
1804: The map is a specification of a map to retreive the resources from,
1805: either as a url or as an object. The filterFunc is a reference to a
1806: function that takes a resource object as its one argument and returns
1807: true if the resource should be included, or false if it should not
1808: be. If recursive is true, the map will be recursively examined,
1809: otherwise it will not be. If bailout is true, the function will return
1810: as soon as it finds a resource, if false it will finish. By default,
1811: the map is the top-level map of the course, filterFunc is a function
1812: that always returns 1, recursive is true, bailout is false. The
1813: resources will be returned in a list containing the resource objects
1814: for the corresponding resources, with B<no structure information> in
1815: the list; regardless of branching, recursion, etc., it will be a flat
1816: list.
1817:
1818: Thus, this is suitable for cases where you don't want the structure,
1819: just a list of all resources. It is also suitable for finding out how
1820: many resources match a given description; for this use, if all you
1821: want to know is if I<any> resources match the description, the bailout
1822: parameter will allow you to avoid potentially expensive enumeration of
1823: all matching resources.
1824:
1825: =item * B<hasResources>(map, filterFunc, recursive):
1826:
1827: Convience method for
1828:
1829: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
1830:
1831: which will tell whether the map has resources matching the description
1832: in the filter function.
1833:
1834: =cut
1835:
1836: sub getResourceByUrl {
1837: my $self = shift;
1838: my $resUrl = shift;
1839:
1840: if (ref($resUrl)) { return $resUrl; }
1841:
1842: $resUrl = &Apache::lonnet::clutter($resUrl);
1843: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1844: if ($resId =~ /,/) {
1845: $resId = (split (/,/, $resId))[0];
1846: }
1847: if (!$resId) { return ''; }
1848: return $self->getById($resId);
1849: }
1850:
1851: sub retrieveResources {
1852: my $self = shift;
1853: my $map = shift;
1854: my $filterFunc = shift;
1855: if (!defined ($filterFunc)) {
1856: $filterFunc = sub {return 1;};
1857: }
1858: my $recursive = shift;
1859: if (!defined($recursive)) { $recursive = 1; }
1860: my $bailout = shift;
1861: if (!defined($bailout)) { $bailout = 0; }
1862:
1863: # Create the necessary iterator.
1864: if (!ref($map)) { # assume it's a url of a map.
1865: $map = $self->getResourceByUrl($map);
1866: }
1867:
1868: # Check the map's validity.
1869: if (!$map || !$map->is_map()) {
1870: # Oh, to throw an exception.... how I'd love that!
1871: return ();
1872: }
1873:
1874: # Get an iterator.
1875: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1876: !$recursive);
1877:
1878: my @resources = ();
1879:
1880: # Run down the iterator and collect the resources.
1881: my $depth = 1;
1882: $it->next();
1883: my $curRes = $it->next();
1884:
1885: while ($depth > 0) {
1886: if ($curRes == $it->BEGIN_MAP()) {
1887: $depth++;
1888: }
1889: if ($curRes == $it->END_MAP()) {
1890: $depth--;
1891: }
1892:
1893: if (ref($curRes)) {
1894: if (!&$filterFunc($curRes)) {
1895: next;
1896: }
1897:
1898: push @resources, $curRes;
1899:
1900: if ($bailout) {
1901: return @resources;
1902: }
1903: }
1904:
1905: $curRes = $it->next();
1906: }
1907:
1908: return @resources;
1909: }
1910:
1911: sub hasResource {
1912: my $self = shift;
1913: my $map = shift;
1914: my $filterFunc = shift;
1915: my $recursive = shift;
1916:
1917: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1918: }
1919:
1920: 1;
1921:
1922: package Apache::lonnavmaps::iterator;
1923:
1924: =pod
1925:
1926: =back
1927:
1928: =head1 Object: navmap Iterator
1929:
1930: An I<iterator> encapsulates the logic required to traverse a data
1931: structure. navmap uses an iterator to traverse the course map
1932: according to the criteria you wish to use.
1933:
1934: To obtain an iterator, call the B<getIterator>() function of a
1935: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
1936: directly.) This will return a reference to the iterator:
1937:
1938: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1939:
1940: To get the next thing from the iterator, call B<next>:
1941:
1942: C<my $nextThing = $resourceIterator-E<gt>next()>
1943:
1944: getIterator behaves as follows:
1945:
1946: =over 4
1947:
1948: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
1949:
1950: All parameters are optional. firstResource is a resource reference
1951: corresponding to where the iterator should start. It defaults to
1952: navmap->firstResource() for the corresponding nav map. finishResource
1953: corresponds to where you want the iterator to end, defaulting to
1954: navmap->finishResource(). filterHash is a hash used as a set
1955: containing strings representing the resource IDs, defaulting to
1956: empty. Condition is a 1 or 0 that sets what to do with the filter
1957: hash: If a 0, then only resource that exist IN the filterHash will be
1958: recursed on. If it is a 1, only resources NOT in the filterHash will
1959: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
1960: false (default), the iterator will only return the first level of map
1961: that is not just a single, 'redirecting' map. If true, the iterator
1962: will return all information, starting with the top-level map,
1963: regardless of content. returnTopMap, if true (default false), will
1964: cause the iterator to return the top-level map object (resource 0.0)
1965: before anything else.
1966:
1967: Thus, by default, only top-level resources will be shown. Change the
1968: condition to a 1 without changing the hash, and all resources will be
1969: shown. Changing the condition to 1 and including some values in the
1970: hash will allow you to selectively suppress parts of the navmap, while
1971: leaving it on 0 and adding things to the hash will allow you to
1972: selectively add parts of the nav map. See the handler code for
1973: examples.
1974:
1975: The iterator will return either a reference to a resource object, or a
1976: token representing something in the map, such as the beginning of a
1977: new branch. The possible tokens are:
1978:
1979: =over 4
1980:
1981: =item * BEGIN_MAP:
1982:
1983: A new map is being recursed into. This is returned I<after> the map
1984: resource itself is returned.
1985:
1986: =item * END_MAP:
1987:
1988: The map is now done.
1989:
1990: =item * BEGIN_BRANCH:
1991:
1992: A branch is now starting. The next resource returned will be the first
1993: in that branch.
1994:
1995: =item * END_BRANCH:
1996:
1997: The branch is now done.
1998:
1999: =back
2000:
2001: The tokens are retreivable via methods on the iterator object, i.e.,
2002: $iterator->END_MAP.
2003:
2004: Maps can contain empty resources. The iterator will automatically skip
2005: over such resources, but will still treat the structure
2006: correctly. Thus, a complicated map with several branches, but
2007: consisting entirely of empty resources except for one beginning or
2008: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2009: but only one resource will be returned.
2010:
2011: =back
2012:
2013: =cut
2014:
2015: # Here are the tokens for the iterator:
2016:
2017: sub BEGIN_MAP { return 1; } # begining of a new map
2018: sub END_MAP { return 2; } # end of the map
2019: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2020: sub END_BRANCH { return 4; } # end of a branch
2021: sub FORWARD { return 1; } # go forward
2022: sub BACKWARD { return 2; }
2023:
2024: sub min {
2025: (my $a, my $b) = @_;
2026: if ($a < $b) { return $a; } else { return $b; }
2027: }
2028:
2029: # In the CVS repository, documentation of this algorithm is included
2030: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
2031: # will reference the same location in the text as the part of the
2032: # algorithm is running through.
2033:
2034: sub new {
2035: # magic invocation to create a class instance
2036: my $proto = shift;
2037: my $class = ref($proto) || $proto;
2038: my $self = {};
2039:
2040: $self->{NAV_MAP} = shift;
2041: return undef unless ($self->{NAV_MAP});
2042:
2043: # Handle the parameters
2044: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2045: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2046:
2047: # If the given resources are just the ID of the resource, get the
2048: # objects
2049: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2050: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2051: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2052: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2053:
2054: $self->{FILTER} = shift;
2055:
2056: # A hash, used as a set, of resource already seen
2057: $self->{ALREADY_SEEN} = shift;
2058: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2059: $self->{CONDITION} = shift;
2060:
2061: # Do we want to automatically follow "redirection" maps?
2062: $self->{FORCE_TOP} = shift;
2063:
2064: # Do we want to return the top-level map object (resource 0.0)?
2065: $self->{RETURN_0} = shift;
2066: # have we done that yet?
2067: $self->{HAVE_RETURNED_0} = 0;
2068:
2069: # Now, we need to pre-process the map, by walking forward and backward
2070: # over the parts of the map we're going to look at.
2071:
2072: # The processing steps are exactly the same, except for a few small
2073: # changes, so I bundle those up in the following list of two elements:
2074: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2075: # first_resource).
2076: # This prevents writing nearly-identical code twice.
2077: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2078: 'FIRST_RESOURCE'],
2079: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2080: 'FINISH_RESOURCE'] );
2081:
2082: my $maxDepth = 0; # tracks max depth
2083:
2084: # If there is only one resource in this map, and it's a map, we
2085: # want to remember that, so the user can ask for the first map
2086: # that isn't just a redirector.
2087: my $resource; my $resourceCount = 0;
2088:
2089: # **1**
2090:
2091: foreach my $pass (@iterations) {
2092: my $direction = $pass->[0];
2093: my $valName = $pass->[1];
2094: my $nextResourceMethod = $pass->[2];
2095: my $firstResourceName = $pass->[3];
2096:
2097: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2098: $self->{FIRST_RESOURCE},
2099: $self->{FINISH_RESOURCE},
2100: {}, undef, 0, $direction);
2101:
2102: # prime the recursion
2103: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2104: my $depth = 0;
2105: $iterator->next();
2106: my $curRes = $iterator->next();
2107: while ($depth > -1) {
2108: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2109: if ($curRes == $iterator->END_MAP()) { $depth--; }
2110:
2111: if (ref($curRes)) {
2112: # If there's only one resource, this will save it
2113: # we have to filter empty resources from consideration here,
2114: # or even "empty", redirecting maps have two (start & finish)
2115: # or three (start, finish, plus redirector)
2116: if($direction == FORWARD && $curRes->src()) {
2117: $resource = $curRes; $resourceCount++;
2118: }
2119: my $resultingVal = $curRes->{DATA}->{$valName};
2120: my $nextResources = $curRes->$nextResourceMethod();
2121: my $nextCount = scalar(@{$nextResources});
2122:
2123: if ($nextCount == 1) { # **3**
2124: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2125: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2126: }
2127:
2128: if ($nextCount > 1) { # **4**
2129: foreach my $res (@{$nextResources}) {
2130: my $current = $res->{DATA}->{$valName} || 999999999;
2131: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2132: }
2133: }
2134: }
2135:
2136: # Assign the final val (**2**)
2137: if (ref($curRes) && $direction == BACKWARD()) {
2138: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2139: $curRes->{DATA}->{BOT_UP_VAL});
2140:
2141: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2142: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2143: }
2144: $curRes = $iterator->next();
2145: }
2146: }
2147:
2148: # Check: Was this only one resource, a map?
2149: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2150: my $firstResource = $resource->map_start();
2151: my $finishResource = $resource->map_finish();
2152: return
2153: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2154: $finishResource, $self->{FILTER},
2155: $self->{ALREADY_SEEN},
2156: $self->{CONDITION}, 0);
2157:
2158: }
2159:
2160: # Set up some bookkeeping information.
2161: $self->{CURRENT_DEPTH} = 0;
2162: $self->{MAX_DEPTH} = $maxDepth;
2163: $self->{STACK} = [];
2164: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2165:
2166: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2167: push @{$self->{STACK}}, [];
2168: }
2169:
2170: # Prime the recursion w/ the first resource **5**
2171: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2172: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2173:
2174: bless ($self);
2175:
2176: return $self;
2177: }
2178:
2179: sub next {
2180: my $self = shift;
2181:
2182: # If we want to return the top-level map object, and haven't yet,
2183: # do so.
2184: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2185: $self->{HAVE_RETURNED_0} = 1;
2186: return $self->{NAV_MAP}->getById('0.0');
2187: }
2188:
2189: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2190: # grab the next from the recursive iterator
2191: my $next = $self->{RECURSIVE_ITERATOR}->next();
2192:
2193: # is it a begin or end map? If so, update the depth
2194: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2195: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2196:
2197: # Are we back at depth 0? If so, stop recursing
2198: if ($self->{RECURSIVE_DEPTH} == 0) {
2199: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2200: }
2201:
2202: return $next;
2203: }
2204:
2205: if (defined($self->{FORCE_NEXT})) {
2206: my $tmp = $self->{FORCE_NEXT};
2207: $self->{FORCE_NEXT} = undef;
2208: return $tmp;
2209: }
2210:
2211: # Have we not yet begun? If not, return BEGIN_MAP and
2212: # remember we've started.
2213: if ( !$self->{STARTED} ) {
2214: $self->{STARTED} = 1;
2215: return $self->BEGIN_MAP();
2216: }
2217:
2218: # Here's the guts of the iterator.
2219:
2220: # Find the next resource, if any.
2221: my $found = 0;
2222: my $i = $self->{MAX_DEPTH};
2223: my $newDepth;
2224: my $here;
2225: while ( $i >= 0 && !$found ) {
2226: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2227: $here = pop @{$self->{STACK}->[$i]}; # **7**
2228: $found = 1;
2229: $newDepth = $i;
2230: }
2231: $i--;
2232: }
2233:
2234: # If we still didn't find anything, we're done.
2235: if ( !$found ) {
2236: # We need to get back down to the correct branch depth
2237: if ( $self->{CURRENT_DEPTH} > 0 ) {
2238: $self->{CURRENT_DEPTH}--;
2239: return END_BRANCH();
2240: } else {
2241: return END_MAP();
2242: }
2243: }
2244:
2245: # If this is not a resource, it must be an END_BRANCH marker we want
2246: # to return directly.
2247: if (!ref($here)) { # **8**
2248: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2249: $self->{CURRENT_DEPTH}--;
2250: return $here;
2251: }
2252: }
2253:
2254: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2255: $self->{HERE} = $here;
2256:
2257: # Get to the right level
2258: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2259: push @{$self->{STACK}->[$newDepth]}, $here;
2260: $self->{CURRENT_DEPTH}--;
2261: return END_BRANCH();
2262: }
2263: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2264: push @{$self->{STACK}->[$newDepth]}, $here;
2265: $self->{CURRENT_DEPTH}++;
2266: return BEGIN_BRANCH();
2267: }
2268:
2269: # If we made it here, we have the next resource, and we're at the
2270: # right branch level. So let's examine the resource for where
2271: # we can get to from here.
2272:
2273: # So we need to look at all the resources we can get to from here,
2274: # categorize them if we haven't seen them, remember if we have a new
2275: my $nextUnfiltered = $here->getNext();
2276: my $maxDepthAdded = -1;
2277:
2278: for (@$nextUnfiltered) {
2279: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2280: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2281: push @{$self->{STACK}->[$depth]}, $_;
2282: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2283: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2284: }
2285: }
2286:
2287: # Is this the end of a branch? If so, all of the resources examined above
2288: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2289: # marker onto the stack so we don't forget.
2290: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2291: # BC branch and gets to C, it will see F as the only next resource, but it's
2292: # one level lower. Thus, this is the end of the branch, since there are no
2293: # more resources added to this level or above.
2294: # We don't do this if the examined resource is the finish resource,
2295: # because the condition given above is true, but the "END_MAP" will
2296: # take care of things and we should already be at depth 0.
2297: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2298: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2299: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2300: }
2301:
2302: # That ends the main iterator logic. Now, do we want to recurse
2303: # down this map (if this resource is a map)?
2304: if ($self->{HERE}->is_map() &&
2305: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2306: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2307: my $firstResource = $self->{HERE}->map_start();
2308: my $finishResource = $self->{HERE}->map_finish();
2309:
2310: $self->{RECURSIVE_ITERATOR} =
2311: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2312: $finishResource, $self->{FILTER},
2313: $self->{ALREADY_SEEN}, $self->{CONDITION});
2314: }
2315:
2316: # If this is a blank resource, don't actually return it.
2317: # Should you ever find you need it, make sure to add an option to the code
2318: # that you can use; other things depend on this behavior.
2319: my $browsePriv = $self->{HERE}->browsePriv();
2320: if (!$self->{HERE}->src() ||
2321: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2322: return $self->next();
2323: }
2324:
2325: return $self->{HERE};
2326:
2327: }
2328:
2329: =pod
2330:
2331: The other method available on the iterator is B<getStack>, which
2332: returns an array populated with the current 'stack' of maps, as
2333: references to the resource objects. Example: This is useful when
2334: making the navigation map, as we need to check whether we are under a
2335: page map to see if we need to link directly to the resource, or to the
2336: page. The first elements in the array will correspond to the top of
2337: the stack (most inclusive map).
2338:
2339: =cut
2340:
2341: sub getStack {
2342: my $self=shift;
2343:
2344: my @stack;
2345:
2346: $self->populateStack(\@stack);
2347:
2348: return \@stack;
2349: }
2350:
2351: # Private method: Calls the iterators recursively to populate the stack.
2352: sub populateStack {
2353: my $self=shift;
2354: my $stack = shift;
2355:
2356: push @$stack, $self->{HERE} if ($self->{HERE});
2357:
2358: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2359: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2360: }
2361: }
2362:
2363: 1;
2364:
2365: package Apache::lonnavmaps::DFSiterator;
2366:
2367: # Not documented in the perldoc: This is a simple iterator that just walks
2368: # through the nav map and presents the resources in a depth-first search
2369: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2370: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2371: # useful for pre-processing of some kind, and is in fact used by the main
2372: # iterator that way, but that's about it.
2373: # One could imagine merging this into the init routine of the main iterator,
2374: # but this might as well be left seperate, since it is possible some other
2375: # use might be found for it. - Jeremy
2376:
2377: # Unlike the main iterator, this DOES return all resources, even blank ones.
2378: # The main iterator needs them to correctly preprocess the map.
2379:
2380: sub BEGIN_MAP { return 1; } # begining of a new map
2381: sub END_MAP { return 2; } # end of the map
2382: sub FORWARD { return 1; } # go forward
2383: sub BACKWARD { return 2; }
2384:
2385: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2386: # filter hash ref (or undef), already seen hash or undef, condition
2387: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2388: sub new {
2389: # magic invocation to create a class instance
2390: my $proto = shift;
2391: my $class = ref($proto) || $proto;
2392: my $self = {};
2393:
2394: $self->{NAV_MAP} = shift;
2395: return undef unless ($self->{NAV_MAP});
2396:
2397: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2398: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2399:
2400: # If the given resources are just the ID of the resource, get the
2401: # objects
2402: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2403: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2404: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2405: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2406:
2407: $self->{FILTER} = shift;
2408:
2409: # A hash, used as a set, of resource already seen
2410: $self->{ALREADY_SEEN} = shift;
2411: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2412: $self->{CONDITION} = shift;
2413: $self->{DIRECTION} = shift || FORWARD();
2414:
2415: # Flag: Have we started yet?
2416: $self->{STARTED} = 0;
2417:
2418: # Should we continue calling the recursive iterator, if any?
2419: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2420: # The recursive iterator, if any
2421: $self->{RECURSIVE_ITERATOR} = undef;
2422: # Are we recursing on a map, or a branch?
2423: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2424: # And the count of how deep it is, so that this iterator can keep track of
2425: # when to pick back up again.
2426: $self->{RECURSIVE_DEPTH} = 0;
2427:
2428: # For keeping track of our branches, we maintain our own stack
2429: $self->{STACK} = [];
2430:
2431: # Start with the first resource
2432: if ($self->{DIRECTION} == FORWARD) {
2433: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2434: } else {
2435: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2436: }
2437:
2438: bless($self);
2439: return $self;
2440: }
2441:
2442: sub next {
2443: my $self = shift;
2444:
2445: # Are we using a recursive iterator? If so, pull from that and
2446: # watch the depth; we want to resume our level at the correct time.
2447: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2448: # grab the next from the recursive iterator
2449: my $next = $self->{RECURSIVE_ITERATOR}->next();
2450:
2451: # is it a begin or end map? Update depth if so
2452: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2453: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2454:
2455: # Are we back at depth 0? If so, stop recursing.
2456: if ($self->{RECURSIVE_DEPTH} == 0) {
2457: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2458: }
2459:
2460: return $next;
2461: }
2462:
2463: # Is there a current resource to grab? If not, then return
2464: # END_MAP, which will end the iterator.
2465: if (scalar(@{$self->{STACK}}) == 0) {
2466: return $self->END_MAP();
2467: }
2468:
2469: # Have we not yet begun? If not, return BEGIN_MAP and
2470: # remember that we've started.
2471: if ( !$self->{STARTED} ) {
2472: $self->{STARTED} = 1;
2473: return $self->BEGIN_MAP;
2474: }
2475:
2476: # Get the next resource in the branch
2477: $self->{HERE} = pop @{$self->{STACK}};
2478:
2479: # remember that we've seen this, so we don't return it again later
2480: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2481:
2482: # Get the next possible resources
2483: my $nextUnfiltered;
2484: if ($self->{DIRECTION} == FORWARD()) {
2485: $nextUnfiltered = $self->{HERE}->getNext();
2486: } else {
2487: $nextUnfiltered = $self->{HERE}->getPrevious();
2488: }
2489: my $next = [];
2490:
2491: # filter the next possibilities to remove things we've
2492: # already seen.
2493: foreach (@$nextUnfiltered) {
2494: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2495: push @$next, $_;
2496: }
2497: }
2498:
2499: while (@$next) {
2500: # copy the next possibilities over to the stack
2501: push @{$self->{STACK}}, shift @$next;
2502: }
2503:
2504: # If this is a map and we want to recurse down it... (not filtered out)
2505: if ($self->{HERE}->is_map() &&
2506: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2507: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2508: my $firstResource = $self->{HERE}->map_start();
2509: my $finishResource = $self->{HERE}->map_finish();
2510:
2511: $self->{RECURSIVE_ITERATOR} =
2512: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2513: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2514: $self->{CONDITION}, $self->{DIRECTION});
2515: }
2516:
2517: return $self->{HERE};
2518: }
2519:
2520: 1;
2521:
2522: package Apache::lonnavmaps::resource;
2523:
2524: use Apache::lonnet;
2525:
2526: =pod
2527:
2528: =head1 Object: resource
2529:
2530: A resource object encapsulates a resource in a resource map, allowing
2531: easy manipulation of the resource, querying the properties of the
2532: resource (including user properties), and represents a reference that
2533: can be used as the canonical representation of the resource by
2534: lonnavmap clients like renderers.
2535:
2536: A resource only makes sense in the context of a navmap, as some of the
2537: data is stored in the navmap object.
2538:
2539: You will probably never need to instantiate this object directly. Use
2540: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2541: starting resource.
2542:
2543: =head2 Public Members
2544:
2545: resource objects have a hash called DATA ($resourceRef->{DATA}) that
2546: you can store whatever you want in. This allows you to easily do
2547: two-pass algorithms without worrying about managing your own
2548: resource->data hash.
2549:
2550: =head2 Methods
2551:
2552: =over 4
2553:
2554: =item * B<new>($navmapRef, $idString):
2555:
2556: The first arg is a reference to the parent navmap object. The second
2557: is the idString of the resource itself. Very rarely, if ever, called
2558: directly. Use the nav map->getByID() method.
2559:
2560: =back
2561:
2562: =cut
2563:
2564: sub new {
2565: # magic invocation to create a class instance
2566: my $proto = shift;
2567: my $class = ref($proto) || $proto;
2568: my $self = {};
2569:
2570: $self->{NAV_MAP} = shift;
2571: $self->{ID} = shift;
2572:
2573: # Store this new resource in the parent nav map's cache.
2574: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
2575: $self->{RESOURCE_ERROR} = 0;
2576:
2577: # A hash that can be used by two-pass algorithms to store data
2578: # about this resource in. Not used by the resource object
2579: # directly.
2580: $self->{DATA} = {};
2581:
2582: bless($self);
2583:
2584: return $self;
2585: }
2586:
2587: # private function: simplify the NAV_HASH lookups we keep doing
2588: # pass the name, and to automatically append my ID, pass a true val on the
2589: # second param
2590: sub navHash {
2591: my $self = shift;
2592: my $param = shift;
2593: my $id = shift;
2594: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
2595: }
2596:
2597: =pod
2598:
2599: B<Metadata Retreival>
2600:
2601: These are methods that help you retrieve metadata about the resource:
2602: Method names are based on the fields in the compiled course
2603: representation.
2604:
2605: =over 4
2606:
2607: =item * B<compTitle>:
2608:
2609: Returns a "composite title", that is equal to $res->title() if the
2610: resource has a title, and is otherwise the last part of the URL (e.g.,
2611: "problem.problem").
2612:
2613: =item * B<ext>:
2614:
2615: Returns true if the resource is external.
2616:
2617: =item * B<goesto>:
2618:
2619: Returns the "goesto" value from the compiled nav map. (It is likely
2620: you want to use B<getNext> instead.)
2621:
2622: =item * B<kind>:
2623:
2624: Returns the kind of the resource from the compiled nav map.
2625:
2626: =item * B<randomout>:
2627:
2628: Returns true if this resource was chosen to NOT be shown to the user
2629: by the random map selection feature. In other words, this is usually
2630: false.
2631:
2632: =item * B<randompick>:
2633:
2634: Returns true for a map if the randompick feature is being used on the
2635: map. (?)
2636:
2637: =item * B<src>:
2638:
2639: Returns the source for the resource.
2640:
2641: =item * B<symb>:
2642:
2643: Returns the symb for the resource.
2644:
2645: =item * B<title>:
2646:
2647: Returns the title of the resource.
2648:
2649: =item * B<to>:
2650:
2651: Returns the "to" value from the compiled nav map. (It is likely you
2652: want to use B<getNext> instead.)
2653:
2654: =back
2655:
2656: =cut
2657:
2658: # These info functions can be used directly, as they don't return
2659: # resource information.
2660: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
2661: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
2662: sub from { my $self=shift; return $self->navHash("from_", 1); }
2663: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2664: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
2665: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2666: sub randompick {
2667: my $self = shift;
2668: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2669: '.0.parameter_randompick'};
2670: }
2671: sub src {
2672: my $self=shift;
2673: return $self->navHash("src_", 1);
2674: }
2675: sub symb {
2676: my $self=shift;
2677: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2678: my $symbSrc = &Apache::lonnet::declutter($self->src());
2679: return &Apache::lonnet::declutter(
2680: $self->navHash('map_id_'.$first))
2681: . '___' . $second . '___' . $symbSrc;
2682: }
2683: sub title { my $self=shift; return $self->navHash("title_", 1); }
2684: sub to { my $self=shift; return $self->navHash("to_", 1); }
2685: sub compTitle {
2686: my $self = shift;
2687: my $title = $self->title();
2688: $title=~s/\&colon\;/\:/gs;
2689: if (!$title) {
2690: $title = $self->src();
2691: $title = substr($title, rindex($title, '/') + 1);
2692: }
2693: return $title;
2694: }
2695: =pod
2696:
2697: B<Predicate Testing the Resource>
2698:
2699: These methods are shortcuts to deciding if a given resource has a given property.
2700:
2701: =over 4
2702:
2703: =item * B<is_map>:
2704:
2705: Returns true if the resource is a map type.
2706:
2707: =item * B<is_problem>:
2708:
2709: Returns true if the resource is a problem type, false
2710: otherwise. (Looks at the extension on the src field; might need more
2711: to work correctly.)
2712:
2713: =item * B<is_page>:
2714:
2715: Returns true if the resource is a page.
2716:
2717: =item * B<is_sequence>:
2718:
2719: Returns true if the resource is a sequence.
2720:
2721: =back
2722:
2723: =cut
2724:
2725:
2726: sub is_html {
2727: my $self=shift;
2728: my $src = $self->src();
2729: return ($src =~ /html$/);
2730: }
2731: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2732: sub is_page {
2733: my $self=shift;
2734: my $src = $self->src();
2735: return ($src =~ /page$/);
2736: }
2737: sub is_problem {
2738: my $self=shift;
2739: my $src = $self->src();
2740: return ($src =~ /problem$/);
2741: }
2742: sub is_sequence {
2743: my $self=shift;
2744: my $src = $self->src();
2745: return ($src =~ /sequence$/);
2746: }
2747:
2748: # Private method: Shells out to the parmval in the nav map, handler parts.
2749: sub parmval {
2750: my $self = shift;
2751: my $what = shift;
2752: my $part = shift || "0";
2753: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2754: }
2755:
2756: =pod
2757:
2758: B<Map Methods>
2759:
2760: These methods are useful for getting information about the map
2761: properties of the resource, if the resource is a map (B<is_map>).
2762:
2763: =over 4
2764:
2765: =item * B<map_finish>:
2766:
2767: Returns a reference to a resource object corresponding to the finish
2768: resource of the map.
2769:
2770: =item * B<map_pc>:
2771:
2772: Returns the pc value of the map, which is the first number that
2773: appears in the resource ID of the resources in the map, and is the
2774: number that appears around the middle of the symbs of the resources in
2775: that map.
2776:
2777: =item * B<map_start>:
2778:
2779: Returns a reference to a resource object corresponding to the start
2780: resource of the map.
2781:
2782: =item * B<map_type>:
2783:
2784: Returns a string with the type of the map in it.
2785:
2786: =back
2787:
2788: =cut
2789:
2790: sub map_finish {
2791: my $self = shift;
2792: my $src = $self->src();
2793: $src = Apache::lonnet::clutter($src);
2794: my $res = $self->navHash("map_finish_$src", 0);
2795: $res = $self->{NAV_MAP}->getById($res);
2796: return $res;
2797: }
2798: sub map_pc {
2799: my $self = shift;
2800: my $src = $self->src();
2801: return $self->navHash("map_pc_$src", 0);
2802: }
2803: sub map_start {
2804: my $self = shift;
2805: my $src = $self->src();
2806: $src = Apache::lonnet::clutter($src);
2807: my $res = $self->navHash("map_start_$src", 0);
2808: $res = $self->{NAV_MAP}->getById($res);
2809: return $res;
2810: }
2811: sub map_type {
2812: my $self = shift;
2813: my $pc = $self->map_pc();
2814: return $self->navHash("map_type_$pc", 0);
2815: }
2816:
2817:
2818:
2819: #####
2820: # Property queries
2821: #####
2822:
2823: # These functions will be responsible for returning the CORRECT
2824: # VALUE for the parameter, no matter what. So while they may look
2825: # like direct calls to parmval, they can be more then that.
2826: # So, for instance, the duedate function should use the "duedatetype"
2827: # information, rather then the resource object user.
2828:
2829: =pod
2830:
2831: =head2 Resource Parameters
2832:
2833: In order to use the resource parameters correctly, the nav map must
2834: have been instantiated with genCourseAndUserOptions set to true, so
2835: the courseopt and useropt is read correctly. Then, you can call these
2836: functions to get the relevant parameters for the resource. Each
2837: function defaults to part "0", but can be directed to another part by
2838: passing the part as the parameter.
2839:
2840: These methods are responsible for getting the parameter correct, not
2841: merely reflecting the contents of the GDBM hashes. As we move towards
2842: dates relative to other dates, these methods should be updated to
2843: reflect that. (Then, anybody using these methods will not have to update
2844: their code.)
2845:
2846: =over 4
2847:
2848: =item * B<acc>:
2849:
2850: Get the Client IP/Name Access Control information.
2851:
2852: =item * B<answerdate>:
2853:
2854: Get the answer-reveal date for the problem.
2855:
2856: =item * B<duedate>:
2857:
2858: Get the due date for the problem.
2859:
2860: =item * B<tries>:
2861:
2862: Get the number of tries the student has used on the problem.
2863:
2864: =item * B<maxtries>:
2865:
2866: Get the number of max tries allowed.
2867:
2868: =item * B<opendate>:
2869:
2870: Get the open date for the problem.
2871:
2872: =item * B<sig>:
2873:
2874: Get the significant figures setting.
2875:
2876: =item * B<tol>:
2877:
2878: Get the tolerance for the problem.
2879:
2880: =item * B<tries>:
2881:
2882: Get the number of tries the user has already used on the problem.
2883:
2884: =item * B<type>:
2885:
2886: Get the question type for the problem.
2887:
2888: =item * B<weight>:
2889:
2890: Get the weight for the problem.
2891:
2892: =back
2893:
2894: =cut
2895:
2896: sub acc {
2897: (my $self, my $part) = @_;
2898: return $self->parmval("acc", $part);
2899: }
2900: sub answerdate {
2901: (my $self, my $part) = @_;
2902: # Handle intervals
2903: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2904: return $self->duedate($part) +
2905: $self->parmval("answerdate", $part);
2906: }
2907: return $self->parmval("answerdate", $part);
2908: }
2909: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
2910: sub duedate {
2911: (my $self, my $part) = @_;
2912: return $self->parmval("duedate", $part);
2913: }
2914: sub maxtries {
2915: (my $self, my $part) = @_;
2916: return $self->parmval("maxtries", $part);
2917: }
2918: sub opendate {
2919: (my $self, my $part) = @_;
2920: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2921: return $self->duedate($part) -
2922: $self->parmval("opendate", $part);
2923: }
2924: return $self->parmval("opendate");
2925: }
2926: sub sig {
2927: (my $self, my $part) = @_;
2928: return $self->parmval("sig", $part);
2929: }
2930: sub tol {
2931: (my $self, my $part) = @_;
2932: return $self->parmval("tol", $part);
2933: }
2934: sub tries {
2935: my $self = shift;
2936: my $tries = $self->queryRestoreHash('tries', shift);
2937: if (!defined($tries)) { return '0';}
2938: return $tries;
2939: }
2940: sub type {
2941: (my $self, my $part) = @_;
2942: return $self->parmval("type", $part);
2943: }
2944: sub weight {
2945: my $self = shift; my $part = shift;
2946: return $self->parmval("weight", $part);
2947: }
2948:
2949: # Multiple things need this
2950: sub getReturnHash {
2951: my $self = shift;
2952:
2953: if (!defined($self->{RETURN_HASH})) {
2954: my %tmpHash = &Apache::lonnet::restore($self->symb());
2955: $self->{RETURN_HASH} = \%tmpHash;
2956: }
2957: }
2958:
2959: ######
2960: # Status queries
2961: ######
2962:
2963: # These methods query the status of problems.
2964:
2965: # If we need to count parts, this function determines the number of
2966: # parts from the metadata. When called, it returns a reference to a list
2967: # of strings corresponding to the parts. (Thus, using it in a scalar context
2968: # tells you how many parts you have in the problem:
2969: # $partcount = scalar($resource->countParts());
2970: # Don't use $self->{PARTS} directly because you don't know if it's been
2971: # computed yet.
2972:
2973: =pod
2974:
2975: =head2 Resource misc
2976:
2977: Misc. functions for the resource.
2978:
2979: =over 4
2980:
2981: =item * B<hasDiscussion>:
2982:
2983: Returns a false value if there has been discussion since the user last
2984: logged in, true if there has. Always returns false if the discussion
2985: data was not extracted when the nav map was constructed.
2986:
2987: =item * B<getFeedback>:
2988:
2989: Gets the feedback for the resource and returns the raw feedback string
2990: for the resource, or the null string if there is no feedback or the
2991: email data was not extracted when the nav map was constructed. Usually
2992: used like this:
2993:
2994: for (split(/\,/, $res->getFeedback())) {
2995: my $link = &Apache::lonnet::escape($_);
2996: ...
2997:
2998: and use the link as appropriate.
2999:
3000: =cut
3001:
3002: sub hasDiscussion {
3003: my $self = shift;
3004: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3005: }
3006:
3007: sub getFeedback {
3008: my $self = shift;
3009: my $source = $self->src();
3010: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3011: return $self->{NAV_MAP}->getFeedback($source);
3012: }
3013:
3014: sub getErrors {
3015: my $self = shift;
3016: my $source = $self->src();
3017: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3018: return $self->{NAV_MAP}->getErrors($source);
3019: }
3020:
3021: =pod
3022:
3023: =item * B<parts>():
3024:
3025: Returns a list reference containing sorted strings corresponding to
3026: each part of the problem. To count the number of parts, use the list
3027: in a scalar context, and subtract one if greater than two. (One part
3028: problems have a part 0. Multi-parts have a part 0, plus a part for
3029: each part. Filtering part 0 if you want it is up to you.)
3030:
3031: =item * B<countParts>():
3032:
3033: Returns the number of parts of the problem a student can answer. Thus,
3034: for single part problems, returns 1. For multipart, it returns the
3035: number of parts in the problem, not including psuedo-part 0. Thus,
3036: B<parts> may return an array with fewer parts in it then countParts
3037: might lead you to believe.
3038:
3039: =back
3040:
3041: =cut
3042:
3043: sub parts {
3044: my $self = shift;
3045:
3046: if ($self->ext) { return ['0']; }
3047:
3048: $self->extractParts();
3049: return $self->{PARTS};
3050: }
3051:
3052: sub countParts {
3053: my $self = shift;
3054:
3055: my $parts = $self->parts();
3056: my $delta = 0;
3057: for my $part (@$parts) {
3058: if ($part eq '0') { $delta--; }
3059: }
3060:
3061: if ($self->{RESOURCE_ERROR}) {
3062: return 0;
3063: }
3064:
3065: return scalar(@{$parts}) + $delta;
3066: }
3067:
3068: # Private function: Extracts the parts information and saves it
3069: sub extractParts {
3070: my $self = shift;
3071:
3072: return if (defined($self->{PARTS}));
3073: return if ($self->ext);
3074:
3075: $self->{PARTS} = [];
3076:
3077: # Retrieve part count, if this is a problem
3078: if ($self->is_problem()) {
3079: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3080: if (!$metadata) {
3081: $self->{RESOURCE_ERROR} = 1;
3082: $self->{PARTS} = [];
3083: return;
3084: }
3085: foreach (split(/\,/,$metadata)) {
3086: if ($_ =~ /^part_(.*)$/) {
3087: my $part = $1;
3088: # check to see if part is turned off.
3089: if (! Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3090: push @{$self->{PARTS}}, $1;
3091: }
3092: }
3093: }
3094:
3095:
3096: my @sortedParts = sort @{$self->{PARTS}};
3097: $self->{PARTS} = \@sortedParts;
3098: }
3099:
3100: return;
3101: }
3102:
3103: =pod
3104:
3105: =head2 Resource Status
3106:
3107: Problem resources have status information, reflecting their various
3108: dates and completion statuses.
3109:
3110: There are two aspects to the status: the date-related information and
3111: the completion information.
3112:
3113: Idiomatic usage of these two methods would probably look something
3114: like
3115:
3116: foreach ($resource->parts()) {
3117: my $dateStatus = $resource->getDateStatus($_);
3118: my $completionStatus = $resource->getCompletionStatus($_);
3119:
3120: or
3121:
3122: my $status = $resource->status($_);
3123:
3124: ... use it here ...
3125: }
3126:
3127: Which you use depends on exactly what you are looking for. The
3128: status() function has been optimized for the nav maps display and may
3129: not precisely match what you need elsewhere.
3130:
3131: The symbolic constants shown below can be accessed through the
3132: resource object: C<$res->OPEN>.
3133:
3134: =over 4
3135:
3136: =item * B<getDateStatus>($part):
3137:
3138: ($part defaults to 0). A convenience function that returns a symbolic
3139: constant telling you about the date status of the part. The possible
3140: return values are:
3141:
3142: =back
3143:
3144: B<Date Codes>
3145:
3146: =over 4
3147:
3148: =item * B<OPEN_LATER>:
3149:
3150: The problem will be opened later.
3151:
3152: =item * B<OPEN>:
3153:
3154: Open and not yet due.
3155:
3156:
3157: =item * B<PAST_DUE_ANSWER_LATER>:
3158:
3159: The due date has passed, but the answer date has not yet arrived.
3160:
3161: =item * B<PAST_DUE_NO_ANSWER>:
3162:
3163: The due date has passed and there is no answer opening date set.
3164:
3165: =item * B<ANSWER_OPEN>:
3166:
3167: The answer date is here.
3168:
3169: =item * B<NETWORK_FAILURE>:
3170:
3171: The information is unknown due to network failure.
3172:
3173: =back
3174:
3175: =cut
3176:
3177: # Apparently the compiler optimizes these into constants automatically
3178: sub OPEN_LATER { return 0; }
3179: sub OPEN { return 1; }
3180: sub PAST_DUE_NO_ANSWER { return 2; }
3181: sub PAST_DUE_ANSWER_LATER { return 3; }
3182: sub ANSWER_OPEN { return 4; }
3183: sub NOTHING_SET { return 5; }
3184: sub NETWORK_FAILURE { return 100; }
3185:
3186: # getDateStatus gets the date status for a given problem part.
3187: # Because answer date, due date, and open date are fully independent
3188: # (i.e., it is perfectly possible to *only* have an answer date),
3189: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3190: # (past, future, none given). This function handles this with a decision
3191: # tree. Read the comments to follow the decision tree.
3192:
3193: sub getDateStatus {
3194: my $self = shift;
3195: my $part = shift;
3196: $part = "0" if (!defined($part));
3197:
3198: # Always return network failure if there was one.
3199: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3200:
3201: my $now = time();
3202:
3203: my $open = $self->opendate($part);
3204: my $due = $self->duedate($part);
3205: my $answer = $self->answerdate($part);
3206:
3207: if (!$open && !$due && !$answer) {
3208: # no data on the problem at all
3209: # should this be the same as "open later"? think multipart.
3210: return $self->NOTHING_SET;
3211: }
3212: if (!$open || $now < $open) {return $self->OPEN_LATER}
3213: if (!$due || $now < $due) {return $self->OPEN}
3214: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3215: if ($answer) { return $self->ANSWER_OPEN; }
3216: return PAST_DUE_NO_ANSWER;
3217: }
3218:
3219: =pod
3220:
3221: B<>
3222:
3223: =over 4
3224:
3225: =item * B<getCompletionStatus>($part):
3226:
3227: ($part defaults to 0.) A convenience function that returns a symbolic
3228: constant telling you about the completion status of the part, with the
3229: following possible results:
3230:
3231: =back
3232:
3233: B<Completion Codes>
3234:
3235: =over 4
3236:
3237: =item * B<NOT_ATTEMPTED>:
3238:
3239: Has not been attempted at all.
3240:
3241: =item * B<INCORRECT>:
3242:
3243: Attempted, but wrong by student.
3244:
3245: =item * B<INCORRECT_BY_OVERRIDE>:
3246:
3247: Attempted, but wrong by instructor override.
3248:
3249: =item * B<CORRECT>:
3250:
3251: Correct or correct by instructor.
3252:
3253: =item * B<CORRECT_BY_OVERRIDE>:
3254:
3255: Correct by instructor override.
3256:
3257: =item * B<EXCUSED>:
3258:
3259: Excused. Not yet implemented.
3260:
3261: =item * B<NETWORK_FAILURE>:
3262:
3263: Information not available due to network failure.
3264:
3265: =item * B<ATTEMPTED>:
3266:
3267: Attempted, and not yet graded.
3268:
3269: =back
3270:
3271: =cut
3272:
3273: sub NOT_ATTEMPTED { return 10; }
3274: sub INCORRECT { return 11; }
3275: sub INCORRECT_BY_OVERRIDE { return 12; }
3276: sub CORRECT { return 13; }
3277: sub CORRECT_BY_OVERRIDE { return 14; }
3278: sub EXCUSED { return 15; }
3279: sub ATTEMPTED { return 16; }
3280:
3281: sub getCompletionStatus {
3282: my $self = shift;
3283: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3284:
3285: my $status = $self->queryRestoreHash('solved', shift);
3286:
3287: # Left as seperate if statements in case we ever do more with this
3288: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3289: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3290: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3291: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3292: if ($status eq 'excused') {return $self->EXCUSED; }
3293: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3294: return $self->NOT_ATTEMPTED;
3295: }
3296:
3297: sub queryRestoreHash {
3298: my $self = shift;
3299: my $hashentry = shift;
3300: my $part = shift;
3301: $part = "0" if (!defined($part));
3302: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3303:
3304: $self->getReturnHash();
3305:
3306: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3307: }
3308:
3309: =pod
3310:
3311: B<Composite Status>
3312:
3313: Along with directly returning the date or completion status, the
3314: resource object includes a convenience function B<status>() that will
3315: combine the two status tidbits into one composite status that can
3316: represent the status of the resource as a whole. The precise logic is
3317: documented in the comments of the status method. The following results
3318: may be returned, all available as methods on the resource object
3319: ($res->NETWORK_FAILURE):
3320:
3321: =over 4
3322:
3323: =item * B<NETWORK_FAILURE>:
3324:
3325: The network has failed and the information is not available.
3326:
3327: =item * B<NOTHING_SET>:
3328:
3329: No dates have been set for this problem (part) at all. (Because only
3330: certain parts of a multi-part problem may be assigned, this can not be
3331: collapsed into "open later", as we do not know a given part will EVER
3332: be opened. For single part, this is the same as "OPEN_LATER".)
3333:
3334: =item * B<CORRECT>:
3335:
3336: For any reason at all, the part is considered correct.
3337:
3338: =item * B<EXCUSED>:
3339:
3340: For any reason at all, the problem is excused.
3341:
3342: =item * B<PAST_DUE_NO_ANSWER>:
3343:
3344: The problem is past due, not considered correct, and no answer date is
3345: set.
3346:
3347: =item * B<PAST_DUE_ANSWER_LATER>:
3348:
3349: The problem is past due, not considered correct, and an answer date in
3350: the future is set.
3351:
3352: =item * B<ANSWER_OPEN>:
3353:
3354: The problem is past due, not correct, and the answer is now available.
3355:
3356: =item * B<OPEN_LATER>:
3357:
3358: The problem is not yet open.
3359:
3360: =item * B<TRIES_LEFT>:
3361:
3362: The problem is open, has been tried, is not correct, but there are
3363: tries left.
3364:
3365: =item * B<INCORRECT>:
3366:
3367: The problem is open, and all tries have been used without getting the
3368: correct answer.
3369:
3370: =item * B<OPEN>:
3371:
3372: The item is open and not yet tried.
3373:
3374: =item * B<ATTEMPTED>:
3375:
3376: The problem has been attempted.
3377:
3378: =back
3379:
3380: =cut
3381:
3382: sub TRIES_LEFT { return 10; }
3383:
3384: sub status {
3385: my $self = shift;
3386: my $part = shift;
3387: if (!defined($part)) { $part = "0"; }
3388: my $completionStatus = $self->getCompletionStatus($part);
3389: my $dateStatus = $self->getDateStatus($part);
3390:
3391: # What we have is a two-dimensional matrix with 4 entries on one
3392: # dimension and 5 entries on the other, which we want to colorize,
3393: # plus network failure and "no date data at all".
3394:
3395: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3396:
3397: # There are a few whole rows we can dispose of:
3398: if ($completionStatus == CORRECT ||
3399: $completionStatus == CORRECT_BY_OVERRIDE ) {
3400: return CORRECT;
3401: }
3402:
3403: if ($completionStatus == ATTEMPTED) {
3404: return ATTEMPTED;
3405: }
3406:
3407: # If it's EXCUSED, then return that no matter what
3408: if ($completionStatus == EXCUSED) {
3409: return EXCUSED;
3410: }
3411:
3412: if ($dateStatus == NOTHING_SET) {
3413: return NOTHING_SET;
3414: }
3415:
3416: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3417: # by 4 matrix (date statuses).
3418:
3419: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
3420: $dateStatus == PAST_DUE_NO_ANSWER ) {
3421: return $dateStatus;
3422: }
3423:
3424: if ($dateStatus == ANSWER_OPEN) {
3425: return ANSWER_OPEN;
3426: }
3427:
3428: # Now: (incorrect, incorrect_override, not_attempted) x
3429: # (open_later), (open)
3430:
3431: if ($dateStatus == OPEN_LATER) {
3432: return OPEN_LATER;
3433: }
3434:
3435: # If it's WRONG...
3436: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
3437: # and there are TRIES LEFT:
3438: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
3439: return TRIES_LEFT;
3440: }
3441: return INCORRECT; # otherwise, return orange; student can't fix this
3442: }
3443:
3444: # Otherwise, it's untried and open
3445: return OPEN;
3446: }
3447:
3448: =pod
3449:
3450: =head2 Resource/Nav Map Navigation
3451:
3452: =over 4
3453:
3454: =item * B<getNext>():
3455:
3456: Retreive an array of the possible next resources after this
3457: one. Always returns an array, even in the one- or zero-element case.
3458:
3459: =item * B<getPrevious>():
3460:
3461: Retreive an array of the possible previous resources from this
3462: one. Always returns an array, even in the one- or zero-element case.
3463:
3464: =cut
3465:
3466: sub getNext {
3467: my $self = shift;
3468: my @branches;
3469: my $to = $self->to();
3470: foreach my $branch ( split(/,/, $to) ) {
3471: my $choice = $self->{NAV_MAP}->getById($branch);
3472: my $next = $choice->goesto();
3473: $next = $self->{NAV_MAP}->getById($next);
3474:
3475: push @branches, $next;
3476: }
3477: return \@branches;
3478: }
3479:
3480: sub getPrevious {
3481: my $self = shift;
3482: my @branches;
3483: my $from = $self->from();
3484: foreach my $branch ( split /,/, $from) {
3485: my $choice = $self->{NAV_MAP}->getById($branch);
3486: my $prev = $choice->comesfrom();
3487: $prev = $self->{NAV_MAP}->getById($prev);
3488:
3489: push @branches, $prev;
3490: }
3491: return \@branches;
3492: }
3493:
3494: sub browsePriv {
3495: my $self = shift;
3496: if (defined($self->{BROWSE_PRIV})) {
3497: return $self->{BROWSE_PRIV};
3498: }
3499:
3500: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
3501: }
3502:
3503: =pod
3504:
3505: =back
3506:
3507: =cut
3508:
3509: 1;
3510:
3511: __END__
3512:
3513:
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