1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.305 2004/11/11 22:47:55 albertel 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: ###
29:
30: package Apache::lonnavmaps;
31:
32: use strict;
33: use Apache::Constants qw(:common :http);
34: use Apache::loncommon();
35: use Apache::lonmenu();
36: use Apache::lonenc();
37: use Apache::lonlocal;
38: use POSIX qw (floor strftime);
39: use Data::Dumper; # for debugging, not always
40:
41: # symbolic constants
42: sub SYMB { return 1; }
43: sub URL { return 2; }
44: sub NOTHING { return 3; }
45:
46: # Some data
47:
48: my $resObj = "Apache::lonnavmaps::resource";
49:
50: # Keep these mappings in sync with lonquickgrades, which uses the colors
51: # instead of the icons.
52: my %statusIconMap =
53: (
54: $resObj->CLOSED => '',
55: $resObj->OPEN => 'navmap.open.gif',
56: $resObj->CORRECT => 'navmap.correct.gif',
57: $resObj->INCORRECT => 'navmap.wrong.gif',
58: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
59: $resObj->ERROR => ''
60: );
61:
62: my %iconAltTags =
63: ( 'navmap.correct.gif' => 'Correct',
64: 'navmap.wrong.gif' => 'Incorrect',
65: 'navmap.open.gif' => 'Open' );
66:
67: # Defines a status->color mapping, null string means don't color
68: my %colormap =
69: ( $resObj->NETWORK_FAILURE => '',
70: $resObj->CORRECT => '',
71: $resObj->EXCUSED => '#3333FF',
72: $resObj->PAST_DUE_ANSWER_LATER => '',
73: $resObj->PAST_DUE_NO_ANSWER => '',
74: $resObj->ANSWER_OPEN => '#006600',
75: $resObj->OPEN_LATER => '',
76: $resObj->TRIES_LEFT => '',
77: $resObj->INCORRECT => '',
78: $resObj->OPEN => '',
79: $resObj->NOTHING_SET => '',
80: $resObj->ATTEMPTED => '',
81: $resObj->ANSWER_SUBMITTED => ''
82: );
83: # And a special case in the nav map; what to do when the assignment
84: # is not yet done and due in less then 24 hours
85: my $hurryUpColor = "#FF0000";
86:
87: sub launch_win {
88: my ($mode,$script,$toplinkitems)=@_;
89: my $result;
90: if ($script ne 'no') {
91: $result.='<script type="text/javascript">';
92: }
93: $result.='function launch_navmapwin() {
94: newWindow=open(\'/adm/navmaps?launchExternal\',\'loncapanav\',\'width=400,height=600,scrollbars=1\');
95: }';
96: if ($mode eq 'now') {
97: $result.="\nlaunch_navmapwin();\n";
98: }
99: if ($script ne 'no') {
100: $result.='</script>';
101: }
102: if ($mode eq 'link') {
103: &add_linkitem($toplinkitems,'launchnav','launch_navmapwin()',
104: "Launch navigation window");
105: }
106: return $result;
107: }
108:
109: sub close {
110: if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
111: return(<<ENDCLOSE);
112: <script type="text/javascript">
113: window.status='Accessing Nav Control';
114: menu=window.open("/adm/rat/empty.html","loncapanav",
115: "height=600,width=400,scrollbars=1");
116: window.status='Closing Nav Control';
117: menu.close();
118: window.status='Done.';
119: </script>
120: ENDCLOSE
121: }
122:
123: sub update {
124: if ($ENV{'environment.remotenavmap'} ne 'on') { return ''; }
125: if (!$ENV{'request.course.id'}) { return ''; }
126: if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; }
127: return(<<ENDUPDATE);
128: <form name="navform"></form>
129: <script type="text/javascript">
130: this.document.navform.action='/adm/navmaps#curloc';
131: this.document.navform.target='loncapanav';
132: this.document.navform.submit();
133: </script>
134: ENDUPDATE
135: }
136:
137: sub handler {
138: my $r = shift;
139: real_handler($r);
140: }
141:
142: sub real_handler {
143: my $r = shift;
144:
145: # Handle header-only request
146: if ($r->header_only) {
147: if ($ENV{'browser.mathml'}) {
148: &Apache::loncommon::content_type($r,'text/xml');
149: } else {
150: &Apache::loncommon::content_type($r,'text/html');
151: }
152: $r->send_http_header;
153: return OK;
154: }
155:
156: # Send header, don't cache this page
157: if ($ENV{'browser.mathml'}) {
158: &Apache::loncommon::content_type($r,'text/xml');
159: } else {
160: &Apache::loncommon::content_type($r,'text/html');
161: }
162: &Apache::loncommon::no_cache($r);
163: $r->send_http_header;
164:
165: my %toplinkitems=();
166:
167: if ($ENV{QUERY_STRING} eq 'collapseExternal') {
168: &Apache::lonnet::put('environment',{'remotenavmap' => 'off'});
169: &Apache::lonnet::appenv('environment.remotenavmap' => 'off');
170: my $menu=&Apache::lonmenu::reopenmenu();
171: my $navstatus=&Apache::lonmenu::get_nav_status();
172: if ($menu) {
173: $menu=(<<MENU)
174: swmenu=$menu
175: swmenu.clearTimeout(swmenu.menucltim);
176: $navstatus
177: MENU
178: } else {
179: my $nothing = &Apache::lonhtmlcommon::javascript_nothing();
180: my $mainwindow='window.open('.$nothing.',"loncapaclient","",false);';
181: $menu=(<<MENU)
182: swmenu=$mainwindow
183: $navstatus
184: MENU
185: }
186: $r->print(<<"ENDSUBM");
187: <html>
188: <head>
189: <script type="text/javascript">
190: function submitthis() {
191: $menu
192: self.close();
193: }
194:
195: </script>
196: </head>
197: <body bgcolor="#FFFFFF" onLoad="submitthis()"></body>
198: </html>
199: ENDSUBM
200: return;
201: }
202: if ($ENV{QUERY_STRING} eq 'launchExternal') {
203: &Apache::lonnet::put('environment',{'remotenavmap' => 'on'});
204: &Apache::lonnet::appenv('environment.remotenavmap' => 'on');
205: }
206:
207: # Create the nav map
208: my $navmap = Apache::lonnavmaps::navmap->new();
209:
210: if (!defined($navmap)) {
211: my $requrl = $r->uri;
212: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
213: return HTTP_NOT_ACCEPTABLE;
214: }
215:
216: $r->print("<html><head>\n");
217: $r->print("<title>".&mt('Navigate Course Contents')."</title>");
218: # ------------------------------------------------------------ Get query string
219: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register','sort','showOnlyHomework']);
220:
221: # ----------------------------------------------------- Force menu registration
222: my $addentries='';
223: my $more_unload;
224: my $body_only='';
225: if ($ENV{'environment.remotenavmap'} eq 'on') {
226: $r->print('<script type="text/javascript">
227: function collapse() {
228: this.document.location="/adm/navmaps?collapseExternal";
229: }
230: </script>');
231: # FIXME need to be smarter to only catch window close events
232: # $more_unload="collapse()"
233: $body_only=1;
234: }
235: if ($ENV{'form.register'}) {
236: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
237: '" onUnload="'.&Apache::lonmenu::unloadevents().';'.
238: $more_unload.'"';
239: $r->print(&Apache::lonmenu::registerurl(1));
240: } else {
241: $addentries=' onUnload="'.$more_unload.'"';
242: }
243:
244: # Header
245: $r->print('</head>'.
246: &Apache::loncommon::bodytag('Navigate Course Contents','',
247: $addentries,$body_only,'',
248: $ENV{'form.register'}));
249: $r->print('<script>window.focus();</script>');
250:
251: $r->rflush();
252:
253: # Check that it's defined
254: if (!($navmap->courseMapDefined())) {
255: $r->print(&Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT'));
256: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
257: '</body></html>');
258: return OK;
259: }
260:
261: # See if there's only one map in the top-level, if we don't
262: # already have a filter... if so, automatically display it
263: # (older code; should use retrieveResources)
264: if ($ENV{QUERY_STRING} !~ /filter/) {
265: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
266: my $curRes;
267: my $sequenceCount = 0;
268: my $sequenceId;
269: while ($curRes = $iterator->next()) {
270: if (ref($curRes) && $curRes->is_sequence()) {
271: $sequenceCount++;
272: $sequenceId = $curRes->map_pc();
273: }
274: }
275:
276: if ($sequenceCount == 1) {
277: # The automatic iterator creation in the render call
278: # will pick this up. We know the condition because
279: # the defined($ENV{'form.filter'}) also ensures this
280: # is a fresh call.
281: $ENV{'form.filter'} = "$sequenceId";
282: }
283: }
284:
285: if ($ENV{QUERY_STRING} eq 'launchExternal') {
286: $r->print('
287: <form name="returnwin" action="/adm/flip?postdata=return%3a"
288: method="post" target="loncapaclient">
289: </form>');
290: $r->print('
291: <script type="text/javascript">
292: this.document.returnwin.submit();
293: </script>');
294: }
295:
296: if ($ENV{'environment.remotenavmap'} ne 'on') {
297: $r->print(&launch_win('link','yes',\%toplinkitems));
298: }
299: if ($ENV{'environment.remotenavmap'} eq 'on') {
300: &add_linkitem(\%toplinkitems,'closenav','collapse()',
301: "Close navigation window");
302: }
303:
304: my $jumpToFirstHomework = 0;
305: # Check to see if the student is jumping to next open, do-able problem
306: if ($ENV{QUERY_STRING} =~ /^jumpToFirstHomework/) {
307: $jumpToFirstHomework = 1;
308: # Find the next homework problem that they can do.
309: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
310: my $curRes;
311: my $foundDoableProblem = 0;
312: my $problemRes;
313:
314: while (($curRes = $iterator->next()) && !$foundDoableProblem) {
315: if (ref($curRes) && $curRes->is_problem()) {
316: my $status = $curRes->status();
317: if ($curRes->completable()) {
318: $problemRes = $curRes;
319: $foundDoableProblem = 1;
320:
321: # Pop open all previous maps
322: my $stack = $iterator->getStack();
323: pop @$stack; # last resource in the stack is the problem
324: # itself, which we don't need in the map stack
325: my @mapPcs = map {$_->map_pc()} @$stack;
326: $ENV{'form.filter'} = join(',', @mapPcs);
327:
328: # Mark as both "here" and "jump"
329: $ENV{'form.postsymb'} = $curRes->symb();
330: }
331: }
332: }
333:
334: # If we found no problems, print a note to that effect.
335: if (!$foundDoableProblem) {
336: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
337: }
338: } else {
339: &add_linkitem(\%toplinkitems,'firsthomework',
340: 'location.href="navmaps?jumpToFirstHomework"',
341: "Show Me My First Homework Problem");
342: }
343:
344: my $suppressEmptySequences = 0;
345: my $filterFunc = undef;
346: my $resource_no_folder_link = 0;
347:
348: # Display only due homework.
349: my $showOnlyHomework = 0;
350: if ($ENV{'form.showOnlyHomework'} eq "1") {
351: $showOnlyHomework = 1;
352: $suppressEmptySequences = 1;
353: $filterFunc = sub { my $res = shift;
354: return $res->completable() || $res->is_map();
355: };
356: &add_linkitem(\%toplinkitems,'everything',
357: 'location.href="navmaps?sort='.$ENV{'form.sort'}.'"',
358: "Show Everything");
359: $r->print("<p><font size='+2'>".&mt("Uncompleted Homework")."</font></p>");
360: $ENV{'form.filter'} = '';
361: $ENV{'form.condition'} = 1;
362: $resource_no_folder_link = 1;
363: } else {
364: &add_linkitem(\%toplinkitems,'uncompleted',
365: 'location.href="navmaps?sort='.$ENV{'form.sort'}.
366: '&showOnlyHomework=1"',
367: "Show Only Uncompleted Homework");
368: }
369:
370: my %selected=($ENV{'form.sort'} => 'selected=on');
371: my $sort_html=("<form>
372: <nobr>
373: <input type=\"hidden\" name=\"showOnlyHomework\" value=\"".$ENV{'form.showOnlyHomework'}."\" />
374: <input type=\"submit\" value=\"".&mt('Sort by:')."\" />
375: <select name=\"sort\">
376: <option value=\"default\" $selected{'default'}>".&mt('Default')."</option>
377: <option value=\"title\" $selected{'title'} >".&mt('Title')."</option>
378: <option value=\"duedate\" $selected{'duedate'}>".&mt('Duedate')."</option>
379: <option value=\"discussion\" $selected{'discussion'}>".&mt('Has Discussion')."</option>
380: </select>
381: </nobr>
382: </form>");
383: # renderer call
384: my $renderArgs = { 'cols' => [0,1,2,3],
385: 'sort' => $ENV{'form.sort'},
386: 'url' => '/adm/navmaps',
387: 'navmap' => $navmap,
388: 'suppressNavmap' => 1,
389: 'suppressEmptySequences' => $suppressEmptySequences,
390: 'filterFunc' => $filterFunc,
391: 'resource_no_folder_link' => $resource_no_folder_link,
392: 'sort_html'=> $sort_html,
393: 'r' => $r,
394: 'caller' => 'navmapsdisplay',
395: 'linkitems' => \%toplinkitems};
396: my $render = render($renderArgs);
397:
398: # If no resources were printed, print a reassuring message so the
399: # user knows there was no error.
400: if ($renderArgs->{'counter'} == 0) {
401: if ($showOnlyHomework) {
402: $r->print("<p><font size='+1'>".&mt("All homework is currently completed").".</font></p>");
403: } else { # both jumpToFirstHomework and normal use the same: course must be empty
404: $r->print("<p><font size='+1'>This course is empty.</font></p>");
405: }
406: }
407:
408: $r->print("</body></html>");
409: $r->rflush();
410:
411: return OK;
412: }
413:
414: # Convenience functions: Returns a string that adds or subtracts
415: # the second argument from the first hash, appropriate for the
416: # query string that determines which folders to recurse on
417: sub addToFilter {
418: my $hashIn = shift;
419: my $addition = shift;
420: my %hash = %$hashIn;
421: $hash{$addition} = 1;
422:
423: return join (",", keys(%hash));
424: }
425:
426: sub removeFromFilter {
427: my $hashIn = shift;
428: my $subtraction = shift;
429: my %hash = %$hashIn;
430:
431: delete $hash{$subtraction};
432: return join(",", keys(%hash));
433: }
434:
435: # Convenience function: Given a stack returned from getStack on the iterator,
436: # return the correct src() value.
437: # Later, this should add an anchor when we start putting anchors in pages.
438: sub getLinkForResource {
439: my $stack = shift;
440: my $res;
441:
442: # Check to see if there are any pages in the stack
443: foreach $res (@$stack) {
444: if (defined($res)) {
445: if ($res->is_page()) {
446: return $res->link();
447: }
448: # in case folder was skipped over as "only sequence"
449: my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb());
450: if ($map=~/\.page$/) {
451: return &Apache::lonnet::clutter($map).'#'.
452: &Apache::lonnet::escape(&Apache::lonnet::declutter($src));
453: }
454: }
455: }
456:
457: # Failing that, return the src of the last resource that is defined
458: # (when we first recurse on a map, it puts an undefined resource
459: # on the bottom because $self->{HERE} isn't defined yet, and we
460: # want the src for the map anyhow)
461: foreach (@$stack) {
462: if (defined($_)) { $res = $_; }
463: }
464:
465: return $res->link();
466: }
467:
468: # Convenience function: This separates the logic of how to create
469: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
470: # etc.) into a separate function. It takes a resource object as the
471: # first parameter, and the part number of the resource as the second.
472: # It's basically a big switch statement on the status of the resource.
473:
474: sub getDescription {
475: my $res = shift;
476: my $part = shift;
477: my $status = $res->status($part);
478:
479: if ($status == $res->NETWORK_FAILURE) {
480: return &mt("Having technical difficulties; please check status later");
481: }
482: if ($status == $res->NOTHING_SET) {
483: return &mt("Not currently assigned.");
484: }
485: if ($status == $res->OPEN_LATER) {
486: return "Open " . timeToHumanString($res->opendate($part));
487: }
488: if ($status == $res->OPEN) {
489: if ($res->duedate($part)) {
490: return &mt("Due")." " .timeToHumanString($res->duedate($part));
491: } else {
492: return &mt("Open, no due date");
493: }
494: }
495: if ($status == $res->PAST_DUE_ANSWER_LATER) {
496: return &mt("Answer open")." " . timeToHumanString($res->answerdate($part));
497: }
498: if ($status == $res->PAST_DUE_NO_ANSWER) {
499: return &mt("Was due")." " . timeToHumanString($res->duedate($part));
500: }
501: if ($status == $res->ANSWER_OPEN) {
502: return &mt("Answer available");
503: }
504: if ($status == $res->EXCUSED) {
505: return &mt("Excused by instructor");
506: }
507: if ($status == $res->ATTEMPTED) {
508: return &mt("Answer submitted, not yet graded");
509: }
510: if ($status == $res->TRIES_LEFT) {
511: my $tries = $res->tries($part);
512: my $maxtries = $res->maxtries($part);
513: my $triesString = "";
514: if ($tries && $maxtries) {
515: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
516: if ($maxtries > 1 && $maxtries - $tries == 1) {
517: $triesString = "<b>$triesString</b>";
518: }
519: }
520: if ($res->duedate($part)) {
521: return &mt("Due")." " . timeToHumanString($res->duedate($part)) .
522: " $triesString";
523: } else {
524: return &mt("No due date")." $triesString";
525: }
526: }
527: if ($status == $res->ANSWER_SUBMITTED) {
528: return &mt('Answer submitted');
529: }
530: }
531:
532: # Convenience function, so others can use it: Is the problem due in less then
533: # 24 hours, and still can be done?
534:
535: sub dueInLessThan24Hours {
536: my $res = shift;
537: my $part = shift;
538: my $status = $res->status($part);
539:
540: return ($status == $res->OPEN() ||
541: $status == $res->TRIES_LEFT()) &&
542: $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) &&
543: $res->duedate($part) > time();
544: }
545:
546: # Convenience function, so others can use it: Is there only one try remaining for the
547: # part, with more then one try to begin with, not due yet and still can be done?
548: sub lastTry {
549: my $res = shift;
550: my $part = shift;
551:
552: my $tries = $res->tries($part);
553: my $maxtries = $res->maxtries($part);
554: return $tries && $maxtries && $maxtries > 1 &&
555: $maxtries - $tries == 1 && $res->duedate($part) &&
556: $res->duedate($part) > time();
557: }
558:
559: # This puts a human-readable name on the ENV variable.
560:
561: sub advancedUser {
562: return $ENV{'request.role.adv'};
563: }
564:
565:
566: # timeToHumanString takes a time number and converts it to a
567: # human-readable representation, meant to be used in the following
568: # manner:
569: # print "Due $timestring"
570: # print "Open $timestring"
571: # print "Answer available $timestring"
572: # Very, very, very, VERY English-only... goodness help a localizer on
573: # this func...
574: sub timeToHumanString {
575: my ($time) = @_;
576: # zero, '0' and blank are bad times
577: if (!$time) {
578: return &mt('never');
579: }
580: unless (&Apache::lonlocal::current_language()=~/^en/) {
581: return &Apache::lonlocal::locallocaltime($time);
582: }
583: my $now = time();
584:
585: my @time = localtime($time);
586: my @now = localtime($now);
587:
588: # Positive = future
589: my $delta = $time - $now;
590:
591: my $minute = 60;
592: my $hour = 60 * $minute;
593: my $day = 24 * $hour;
594: my $week = 7 * $day;
595: my $inPast = 0;
596:
597: # Logic in comments:
598: # Is it now? (extremely unlikely)
599: if ( $delta == 0 ) {
600: return "this instant";
601: }
602:
603: if ($delta < 0) {
604: $inPast = 1;
605: $delta = -$delta;
606: }
607:
608: if ( $delta > 0 ) {
609:
610: my $tense = $inPast ? " ago" : "";
611: my $prefix = $inPast ? "" : "in ";
612:
613: # Less then a minute
614: if ( $delta < $minute ) {
615: if ($delta == 1) { return "${prefix}1 second$tense"; }
616: return "$prefix$delta seconds$tense";
617: }
618:
619: # Less then an hour
620: if ( $delta < $hour ) {
621: # If so, use minutes
622: my $minutes = floor($delta / 60);
623: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
624: return "$prefix$minutes minutes$tense";
625: }
626:
627: # Is it less then 24 hours away? If so,
628: # display hours + minutes
629: if ( $delta < $hour * 24) {
630: my $hours = floor($delta / $hour);
631: my $minutes = floor(($delta % $hour) / $minute);
632: my $hourString = "$hours hours";
633: my $minuteString = ", $minutes minutes";
634: if ($hours == 1) {
635: $hourString = "1 hour";
636: }
637: if ($minutes == 1) {
638: $minuteString = ", 1 minute";
639: }
640: if ($minutes == 0) {
641: $minuteString = "";
642: }
643: return "$prefix$hourString$minuteString$tense";
644: }
645:
646: # Less then 5 days away, display day of the week and
647: # HH:MM
648: if ( $delta < $day * 5 ) {
649: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
650: $timeStr =~ s/12:00 am/00:00/;
651: $timeStr =~ s/12:00 pm/noon/;
652: return ($inPast ? "last " : "next ") .
653: $timeStr;
654: }
655:
656: # Is it this year?
657: if ( $time[5] == $now[5]) {
658: # Return on Month Day, HH:MM meridian
659: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
660: $timeStr =~ s/12:00 am/00:00/;
661: $timeStr =~ s/12:00 pm/noon/;
662: return $timeStr;
663: }
664:
665: # Not this year, so show the year
666: my $timeStr = strftime("on %A, %b %e %Y at %I:%M %P", localtime($time));
667: $timeStr =~ s/12:00 am/00:00/;
668: $timeStr =~ s/12:00 pm/noon/;
669: return $timeStr;
670: }
671: }
672:
673:
674: =pod
675:
676: =head1 NAME
677:
678: Apache::lonnavmap - Subroutines to handle and render the navigation
679: maps
680:
681: =head1 SYNOPSIS
682:
683: The main handler generates the navigational listing for the course,
684: the other objects export this information in a usable fashion for
685: other modules.
686:
687: =head1 OVERVIEW
688:
689: X<lonnavmaps, overview> When a user enters a course, LON-CAPA examines the
690: course structure and caches it in what is often referred to as the
691: "big hash" X<big hash>. You can see it if you are logged into
692: LON-CAPA, in a course, by going to /adm/test. (You may need to
693: tweak the /home/httpd/lonTabs/htpasswd file to view it.) The
694: content of the hash will be under the heading "Big Hash".
695:
696: Big Hash contains, among other things, how resources are related
697: to each other (next/previous), what resources are maps, which
698: resources are being chosen to not show to the student (for random
699: selection), and a lot of other things that can take a lot of time
700: to compute due to the amount of data that needs to be collected and
701: processed.
702:
703: Apache::lonnavmaps provides an object model for manipulating this
704: information in a higher-level fashion then directly manipulating
705: the hash. It also provides access to several auxilary functions
706: that aren't necessarily stored in the Big Hash, but are a per-
707: resource sort of value, like whether there is any feedback on
708: a given resource.
709:
710: Apache::lonnavmaps also abstracts away branching, and someday,
711: conditions, for the times where you don't really care about those
712: things.
713:
714: Apache::lonnavmaps also provides fairly powerful routines for
715: rendering navmaps, and last but not least, provides the navmaps
716: view for when the user clicks the NAV button.
717:
718: B<Note>: Apache::lonnavmaps I<only> works for the "currently
719: logged in user"; if you want things like "due dates for another
720: student" lonnavmaps can not directly retrieve information like
721: that. You need the EXT function. This module can still help,
722: because many things, such as the course structure, are constant
723: between users, and Apache::lonnavmaps can help by providing
724: symbs for the EXT call.
725:
726: The rest of this file will cover the provided rendering routines,
727: which can often be used without fiddling with the navmap object at
728: all, then documents the Apache::lonnavmaps::navmap object, which
729: is the key to accessing the Big Hash information, covers the use
730: of the Iterator (which provides the logic for traversing the
731: somewhat-complicated Big Hash data structure), documents the
732: Apache::lonnavmaps::Resource objects that are returned by
733:
734: =head1 Subroutine: render
735:
736: The navmap renderer package provides a sophisticated rendering of the
737: standard navigation maps interface into HTML. The provided nav map
738: handler is actually just a glorified call to this.
739:
740: Because of the large number of parameters this function accepts,
741: instead of passing it arguments as is normal, pass it in an anonymous
742: hash with the desired options.
743:
744: The package provides a function called 'render', called as
745: Apache::lonnavmaps::render({}).
746:
747: =head2 Overview of Columns
748:
749: The renderer will build an HTML table for the navmap and return
750: it. The table is consists of several columns, and a row for each
751: resource (or possibly each part). You tell the renderer how many
752: columns to create and what to place in each column, optionally using
753: one or more of the prepared columns, and the renderer will assemble
754: the table.
755:
756: Any additional generally useful column types should be placed in the
757: renderer code here, so anybody can use it anywhere else. Any code
758: specific to the current application (such as the addition of <input>
759: elements in a column) should be placed in the code of the thing using
760: the renderer.
761:
762: At the core of the renderer is the array reference COLS (see Example
763: section below for how to pass this correctly). The COLS array will
764: consist of entries of one of two types of things: Either an integer
765: representing one of the pre-packaged column types, or a sub reference
766: that takes a resource reference, a part number, and a reference to the
767: argument hash passed to the renderer, and returns a string that will
768: be inserted into the HTML representation as it.
769:
770: All other parameters are ways of either changing how the columns
771: are printing, or which rows are shown.
772:
773: The pre-packaged column names are refered to by constants in the
774: Apache::lonnavmaps namespace. The following currently exist:
775:
776: =over 4
777:
778: =item * B<Apache::lonnavmaps::resource>:
779:
780: The general info about the resource: Link, icon for the type, etc. The
781: first column in the standard nav map display. This column provides the
782: indentation effect seen in the B<NAV> screen. This column also accepts
783: the following parameters in the renderer hash:
784:
785: =over 4
786:
787: =item * B<resource_nolink>: default false
788:
789: If true, the resource will not be linked. By default, all non-folder
790: resources are linked.
791:
792: =item * B<resource_part_count>: default true
793:
794: If true, the resource will show a part count B<if> the full
795: part list is not displayed. (See "condense_parts" later.) If false,
796: the resource will never show a part count.
797:
798: =item * B<resource_no_folder_link>:
799:
800: If true, the resource's folder will not be clickable to open or close
801: it. Default is false. True implies printCloseAll is false, since you
802: can't close or open folders when this is on anyhow.
803:
804: =back
805:
806: =item * B<Apache::lonnavmaps::communication_status>:
807:
808: Whether there is discussion on the resource, email for the user, or
809: (lumped in here) perl errors in the execution of the problem. This is
810: the second column in the main nav map.
811:
812: =item * B<Apache::lonnavmaps::quick_status>:
813:
814: An icon for the status of a problem, with five possible states:
815: Correct, incorrect, open, awaiting grading (for a problem where the
816: computer's grade is suppressed, or the computer can't grade, like
817: essay problem), or none (not open yet, not a problem). The
818: third column of the standard navmap.
819:
820: =item * B<Apache::lonnavmaps::long_status>:
821:
822: A text readout of the details of the current status of the problem,
823: such as "Due in 22 hours". The fourth column of the standard navmap.
824:
825: =item * B<Apache::lonnavmaps::part_status_summary>:
826:
827: A text readout summarizing the status of the problem. If it is a
828: single part problem, will display "Correct", "Incorrect",
829: "Not yet open", "Open", "Attempted", or "Error". If there are
830: multiple parts, this will output a string that in HTML will show a
831: status of how many parts are in each status, in color coding, trying
832: to match the colors of the icons within reason.
833:
834: Note this only makes sense if you are I<not> showing parts. If
835: C<showParts> is true (see below), this column will not output
836: anything.
837:
838: =back
839:
840: If you add any others please be sure to document them here.
841:
842: An example of a column renderer that will show the ID number of a
843: resource, along with the part name if any:
844:
845: sub {
846: my ($resource, $part, $params) = @_;
847: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
848: return '<td>' . $resource->{ID} . '</td>';
849: }
850:
851: Note these functions are responsible for the TD tags, which allow them
852: to override vertical and horizontal alignment, etc.
853:
854: =head2 Parameters
855:
856: Minimally, you should be
857: able to get away with just using 'cols' (to specify the columns
858: shown), 'url' (necessary for the folders to link to the current screen
859: correctly), and possibly 'queryString' if your app calls for it. In
860: that case, maintaining the state of the folders will be done
861: automatically.
862:
863: =over 4
864:
865: =item * B<iterator>: default: constructs one from %ENV
866:
867: A reference to a fresh ::iterator to use from the navmaps. The
868: rendering will reflect the options passed to the iterator, so you can
869: use that to just render a certain part of the course, if you like. If
870: one is not passed, the renderer will attempt to construct one from
871: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
872: 'iterator_map' parameter if any.
873:
874: =item * B<iterator_map>: default: not used
875:
876: If you are letting the renderer do the iterator handling, you can
877: instruct the renderer to render only a particular map by passing it
878: the source of the map you want to process, like
879: '/res/103/jerf/navmap.course.sequence'.
880:
881: =item * B<navmap>: default: constructs one from %ENV
882:
883: A reference to a navmap, used only if an iterator is not passed in. If
884: this is necessary to make an iterator but it is not passed in, a new
885: one will be constructed based on ENV info. This is useful to do basic
886: error checking before passing it off to render.
887:
888: =item * B<r>: default: must be passed in
889:
890: The standard Apache response object. This must be passed to the
891: renderer or the course hash will be locked.
892:
893: =item * B<cols>: default: empty (useless)
894:
895: An array reference
896:
897: =item * B<showParts>:default true
898:
899: A flag. If true, a line for the resource itself, and a line
900: for each part will be displayed. If not, only one line for each
901: resource will be displayed.
902:
903: =item * B<condenseParts>: default true
904:
905: A flag. If true, if all parts of the problem have the same
906: status and that status is Nothing Set, Correct, or Network Failure,
907: then only one line will be displayed for that resource anyhow. If no,
908: all parts will always be displayed. If showParts is 0, this is
909: ignored.
910:
911: =item * B<jumpCount>: default: determined from %ENV
912:
913: A string identifying the URL to place the anchor 'curloc' at.
914: It is the responsibility of the renderer user to
915: ensure that the #curloc is in the URL. By default, determined through
916: the use of the ENV{} 'jump' information, and should normally "just
917: work" correctly.
918:
919: =item * B<here>: default: empty string
920:
921: A Symb identifying where to place the 'here' marker. The empty
922: string means no marker.
923:
924: =item * B<indentString>: default: 25 pixel whitespace image
925:
926: A string identifying the indentation string to use.
927:
928: =item * B<queryString>: default: empty
929:
930: A string which will be prepended to the query string used when the
931: folders are opened or closed. You can use this to pass
932: application-specific values.
933:
934: =item * B<url>: default: none
935:
936: The url the folders will link to, which should be the current
937: page. Required if the resource info column is shown, and you
938: are allowing the user to open and close folders.
939:
940: =item * B<currentJumpIndex>: default: no jumping
941:
942: Describes the currently-open row number to cause the browser to jump
943: to, because the user just opened that folder. By default, pulled from
944: the Jump information in the ENV{'form.*'}.
945:
946: =item * B<printKey>: default: false
947:
948: If true, print the key that appears on the top of the standard
949: navmaps.
950:
951: =item * B<printCloseAll>: default: true
952:
953: If true, print the "Close all folders" or "open all folders"
954: links.
955:
956: =item * B<filterFunc>: default: sub {return 1;} (accept everything)
957:
958: A function that takes the resource object as its only parameter and
959: returns a true or false value. If true, the resource is displayed. If
960: false, it is simply skipped in the display.
961:
962: =item * B<suppressEmptySequences>: default: false
963:
964: If you're using a filter function, and displaying sequences to orient
965: the user, then frequently some sequences will be empty. Setting this to
966: true will cause those sequences not to display, so as not to confuse the
967: user into thinking that if the sequence is there there should be things
968: under it; for example, see the "Show Uncompleted Homework" view on the
969: B<NAV> screen.
970:
971: =item * B<suppressNavmaps>: default: false
972:
973: If true, will not display Navigate Content resources.
974:
975: =back
976:
977: =head2 Additional Info
978:
979: In addition to the parameters you can pass to the renderer, which will
980: be passed through unchange to the column renderers, the renderer will
981: generate the following information which your renderer may find
982: useful:
983:
984: =over 4
985:
986: =item * B<counter>:
987:
988: Contains the number of rows printed. Useful after calling the render
989: function, as you can detect whether anything was printed at all.
990:
991: =item * B<isNewBranch>:
992:
993: Useful for renderers: If this resource is currently the first resource
994: of a new branch, this will be true. The Resource column (leftmost in the
995: navmaps screen) uses this to display the "new branch" icon
996:
997: =back
998:
999: =cut
1000:
1001: sub resource { return 0; }
1002: sub communication_status { return 1; }
1003: sub quick_status { return 2; }
1004: sub long_status { return 3; }
1005: sub part_status_summary { return 4; }
1006:
1007: sub render_resource {
1008: my ($resource, $part, $params) = @_;
1009:
1010: my $nonLinkedText = ''; # stuff after resource title not in link
1011:
1012: my $link = $params->{"resourceLink"};
1013: my $src = $resource->src();
1014: my $it = $params->{"iterator"};
1015: my $filter = $it->{FILTER};
1016:
1017: my $title = $resource->compTitle();
1018:
1019: my $partLabel = "";
1020: my $newBranchText = "";
1021: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonIcons");
1022: # If this is a new branch, label it so
1023: if ($params->{'isNewBranch'}) {
1024: $newBranchText = "<img src='$location/branch.gif' border='0' />";
1025: }
1026:
1027: # links to open and close the folder
1028: my $linkopen = "<a href='$link'>";
1029: my $linkclose = "</a>";
1030:
1031: # Default icon: unknown page
1032: my $icon = "<img src='$location/unknown.gif' alt='' border='0' />";
1033:
1034: if ($resource->is_problem()) {
1035: if ($part eq '0' || $params->{'condensed'}) {
1036: $icon ='<img src="'.$location.'/problem.gif" alt="" border="0" />';
1037: } else {
1038: $icon = $params->{'indentString'};
1039: }
1040: } else {
1041: $icon = "<img src='".&Apache::loncommon::lonhttpdurl(&Apache::loncommon::icon($resource->src))."' alt='' border='0' />";
1042: }
1043:
1044: # Display the correct map icon to open or shut map
1045: if ($resource->is_map()) {
1046: my $mapId = $resource->map_pc();
1047: my $nowOpen = !defined($filter->{$mapId});
1048: if ($it->{CONDITION}) {
1049: $nowOpen = !$nowOpen;
1050: }
1051:
1052: my $folderType = $resource->is_sequence() ? 'folder' : 'page';
1053:
1054: if (!$params->{'resource_no_folder_link'}) {
1055: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
1056: $icon = "<img src='$location/$icon' alt='' border='0' />";
1057:
1058: $linkopen = "<a href='" . $params->{'url'} . '?' .
1059: $params->{'queryString'} . '&filter=';
1060: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
1061: addToFilter($filter, $mapId) :
1062: removeFromFilter($filter, $mapId);
1063: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
1064: . $params->{'hereType'} . '&here=' .
1065: &Apache::lonnet::escape($params->{'here'}) .
1066: '&jump=' .
1067: &Apache::lonnet::escape($resource->symb()) .
1068: "&folderManip=1'>";
1069: } else {
1070: # Don't allow users to manipulate folder
1071: $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') .
1072: '.nomanip.gif';
1073: $icon = "<img src='$location/$icon' alt='' border='0' />";
1074:
1075: $linkopen = "";
1076: $linkclose = "";
1077: }
1078: }
1079:
1080: if ($resource->randomout()) {
1081: $nonLinkedText .= ' <i>(hidden)</i> ';
1082: }
1083:
1084: # We're done preparing and finally ready to start the rendering
1085: my $result = "<td align='left' valign='center'>";
1086:
1087: my $indentLevel = $params->{'indentLevel'};
1088: if ($newBranchText) { $indentLevel--; }
1089:
1090: # print indentation
1091: for (my $i = 0; $i < $indentLevel; $i++) {
1092: $result .= $params->{'indentString'};
1093: }
1094:
1095: # Decide what to display
1096: $result .= "$newBranchText$linkopen$icon$linkclose";
1097:
1098: my $curMarkerBegin = '';
1099: my $curMarkerEnd = '';
1100:
1101: # Is this the current resource?
1102: if (!$params->{'displayedHereMarker'} &&
1103: $resource->symb() eq $params->{'here'} ) {
1104: $curMarkerBegin = '<font color="red" size="+2">> </font>';
1105: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1106: $params->{'displayedHereMarker'} = 1;
1107: }
1108:
1109: if ($resource->is_problem() && $part ne '0' &&
1110: !$params->{'condensed'}) {
1111: my $displaypart=$resource->part_display($part);
1112: $partLabel = " (Part: $displaypart)";
1113: $link.='#'.&Apache::lonnet::escape($part);
1114: $title = "";
1115: }
1116:
1117: if ($params->{'condensed'} && $resource->countParts() > 1) {
1118: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1119: }
1120:
1121: my $target;
1122: if ($ENV{'environment.remotenavmap'} eq 'on') {
1123: $target=' target="loncapaclient" ';
1124: }
1125: if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
1126: $result .= " $curMarkerBegin<a $target href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
1127: } else {
1128: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
1129: }
1130:
1131: return $result;
1132: }
1133:
1134: sub render_communication_status {
1135: my ($resource, $part, $params) = @_;
1136: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
1137:
1138: my $link = $params->{"resourceLink"};
1139: my $linkopen = "<a href='$link'>";
1140: my $linkclose = "</a>";
1141: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1142: if ($resource->hasDiscussion()) {
1143: $discussionHTML = $linkopen .
1144: '<img border="0" src="'.$location.'/chat.gif" />' .
1145: $linkclose;
1146: }
1147:
1148: if ($resource->getFeedback()) {
1149: my $feedback = $resource->getFeedback();
1150: foreach (split(/\,/, $feedback)) {
1151: if ($_) {
1152: $feedbackHTML .= ' <a href="/adm/email?display='
1153: . &Apache::lonnet::escape($_) . '">'
1154: . '<img src="'.$location.'/feedback.gif" '
1155: . 'border="0" /></a>';
1156: }
1157: }
1158: }
1159:
1160: if ($resource->getErrors()) {
1161: my $errors = $resource->getErrors();
1162: my $errorcount = 0;
1163: foreach (split(/,/, $errors)) {
1164: last if ($errorcount>=10); # Only output 10 bombs maximum
1165: if ($_) {
1166: $errorcount++;
1167: $errorHTML .= ' <a href="/adm/email?display='
1168: . &Apache::lonnet::escape($_) . '">'
1169: . '<img src="'.$location.'/bomb.gif" '
1170: . 'border="0" /></a>';
1171: }
1172: }
1173: }
1174:
1175: if ($params->{'multipart'} && $part != '0') {
1176: $discussionHTML = $feedbackHTML = $errorHTML = '';
1177: }
1178:
1179: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
1180:
1181: }
1182: sub render_quick_status {
1183: my ($resource, $part, $params) = @_;
1184: my $result = "";
1185: my $firstDisplayed = !$params->{'condensed'} &&
1186: $params->{'multipart'} && $part eq "0";
1187:
1188: my $link = $params->{"resourceLink"};
1189: my $linkopen = "<a href='$link'>";
1190: my $linkclose = "</a>";
1191:
1192: if ($resource->is_problem() &&
1193: !$firstDisplayed) {
1194:
1195: my $icon = $statusIconMap{$resource->simpleStatus($part)};
1196: my $alt = $iconAltTags{$icon};
1197: if ($icon) {
1198: my $location=
1199: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/$icon");
1200: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='$location' border='0' alt='$alt' />$linkclose</td>\n";
1201: } else {
1202: $result .= "<td width='30'> </td>\n";
1203: }
1204: } else { # not problem, no icon
1205: $result .= "<td width='30'> </td>\n";
1206: }
1207:
1208: return $result;
1209: }
1210: sub render_long_status {
1211: my ($resource, $part, $params) = @_;
1212: my $result = "<td align='right' valign='center'>\n";
1213: my $firstDisplayed = !$params->{'condensed'} &&
1214: $params->{'multipart'} && $part eq "0";
1215:
1216: my $color;
1217: if ($resource->is_problem()) {
1218: $color = $colormap{$resource->status};
1219:
1220: if (dueInLessThan24Hours($resource, $part) ||
1221: lastTry($resource, $part)) {
1222: $color = $hurryUpColor;
1223: }
1224: }
1225:
1226: if ($resource->kind() eq "res" &&
1227: $resource->is_problem() &&
1228: !$firstDisplayed) {
1229: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1230: $result .= getDescription($resource, $part);
1231: if ($color) {$result .= "</b></font>"; }
1232: }
1233: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1234: $result .= '(randomly select ' . $resource->randompick() .')';
1235: }
1236:
1237: # Debugging code
1238: #$result .= " " . $resource->awarded($part) . '/' . $resource->weight($part) .
1239: # ' - Part: ' . $part;
1240:
1241: $result .= "</td>\n";
1242:
1243: return $result;
1244: }
1245:
1246: # Colors obtained by taking the icons, matching the colors, and
1247: # possibly reducing the Value (HSV) of the color, if it's too bright
1248: # for text, generally by one third or so.
1249: my %statusColors =
1250: (
1251: $resObj->CLOSED => '#000000',
1252: $resObj->OPEN => '#998b13',
1253: $resObj->CORRECT => '#26933f',
1254: $resObj->INCORRECT => '#c48207',
1255: $resObj->ATTEMPTED => '#a87510',
1256: $resObj->ERROR => '#000000'
1257: );
1258: my %statusStrings =
1259: (
1260: $resObj->CLOSED => 'Not yet open',
1261: $resObj->OPEN => 'Open',
1262: $resObj->CORRECT => 'Correct',
1263: $resObj->INCORRECT => 'Incorrect',
1264: $resObj->ATTEMPTED => 'Attempted',
1265: $resObj->ERROR => 'Network Error'
1266: );
1267: my @statuses = ($resObj->CORRECT, $resObj->ATTEMPTED, $resObj->INCORRECT, $resObj->OPEN, $resObj->CLOSED, $resObj->ERROR);
1268:
1269: use Data::Dumper;
1270: sub render_parts_summary_status {
1271: my ($resource, $part, $params) = @_;
1272: if (!$resource->is_problem() && !$resource->contains_problem) { return '<td></td>'; }
1273: if ($params->{showParts}) {
1274: return '<td></td>';
1275: }
1276:
1277: my $td = "<td align='right'>\n";
1278: my $endtd = "</td>\n";
1279: my @probs;
1280:
1281: if ($resource->contains_problem) {
1282: @probs=$resource->retrieveResources($resource,sub { $_[0]->is_problem() },1,0);
1283: } else {
1284: @probs=($resource);
1285: }
1286: my $return;
1287: my %overallstatus;
1288: my $totalParts;
1289: foreach my $resource (@probs) {
1290: # If there is a single part, just show the simple status
1291: if ($resource->singlepart()) {
1292: my $status = $resource->simpleStatus(${$resource->parts}[0]);
1293: $overallstatus{$status}++;
1294: $totalParts++;
1295: next;
1296: }
1297: # Now we can be sure the $part doesn't really matter.
1298: my $statusCount = $resource->simpleStatusCount();
1299: my @counts;
1300: foreach my $status (@statuses) {
1301: # decouple display order from the simpleStatusCount order
1302: my $slot = Apache::lonnavmaps::resource::statusToSlot($status);
1303: if ($statusCount->[$slot]) {
1304: $overallstatus{$status}+=$statusCount->[$slot];
1305: $totalParts+=$statusCount->[$slot];
1306: }
1307: }
1308: }
1309: $return.= $td . $totalParts . ' parts: ';
1310: foreach my $status (@statuses) {
1311: if ($overallstatus{$status}) {
1312: $return.="<font color='" . $statusColors{$status} .
1313: "'>" . $overallstatus{$status} . ' '
1314: . $statusStrings{$status} . "</font>";
1315: }
1316: }
1317: $return.= $endtd;
1318: return $return;
1319: }
1320:
1321: my @preparedColumns = (\&render_resource, \&render_communication_status,
1322: \&render_quick_status, \&render_long_status,
1323: \&render_parts_summary_status);
1324:
1325: sub setDefault {
1326: my ($val, $default) = @_;
1327: if (!defined($val)) { return $default; }
1328: return $val;
1329: }
1330:
1331: sub cmp_title {
1332: my ($atitle,$btitle) = (lc($_[0]->compTitle),lc($_[1]->compTitle));
1333: $atitle=~s/^\s*//;
1334: $btitle=~s/^\s*//;
1335: return $atitle cmp $btitle;
1336: }
1337:
1338: sub render {
1339: my $args = shift;
1340: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1341: my $result = '';
1342: # Configure the renderer.
1343: my $cols = $args->{'cols'};
1344: if (!defined($cols)) {
1345: # no columns, no nav maps.
1346: return '';
1347: }
1348: my $mustCloseNavMap = 0;
1349: my $navmap;
1350: if (defined($args->{'navmap'})) {
1351: $navmap = $args->{'navmap'};
1352: }
1353:
1354: my $r = $args->{'r'};
1355: my $queryString = $args->{'queryString'};
1356: my $jump = $args->{'jump'};
1357: my $here = $args->{'here'};
1358: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1359: my $closeAllPages = setDefault($args->{'closeAllPages'}, 0);
1360: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1361: # before the current resource when using #current
1362:
1363: # If we were passed 'here' information, we are not rendering
1364: # after a folder manipulation, and we were not passed an
1365: # iterator, make sure we open the folders to show the "here"
1366: # marker
1367: my $filterHash = {};
1368: # Figure out what we're not displaying
1369: foreach (split(/\,/, $ENV{"form.filter"})) {
1370: if ($_) {
1371: $filterHash->{$_} = "1";
1372: }
1373: }
1374:
1375: # Filter: Remember filter function and add our own filter: Refuse
1376: # to show hidden resources unless the user can see them.
1377: my $userCanSeeHidden = advancedUser();
1378: my $filterFunc = setDefault($args->{'filterFunc'},
1379: sub {return 1;});
1380: if (!$userCanSeeHidden) {
1381: # Without renaming the filterfunc, the server seems to go into
1382: # an infinite loop
1383: my $oldFilterFunc = $filterFunc;
1384: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1385: &$oldFilterFunc($res);};
1386: }
1387:
1388: my $condition = 0;
1389: if ($ENV{'form.condition'}) {
1390: $condition = 1;
1391: }
1392:
1393: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1394: # Step 1: Check to see if we have a navmap
1395: if (!defined($navmap)) {
1396: $navmap = Apache::lonnavmaps::navmap->new();
1397: $mustCloseNavMap = 1;
1398: }
1399:
1400: # Step two: Locate what kind of here marker is necessary
1401: # Determine where the "here" marker is and where the screen jumps to.
1402:
1403: if ($ENV{'form.postsymb'}) {
1404: $here = $jump = &Apache::lonnet::symbclean($ENV{'form.postsymb'});
1405: } elsif ($ENV{'form.postdata'}) {
1406: # couldn't find a symb, is there a URL?
1407: my $currenturl = $ENV{'form.postdata'};
1408: #$currenturl=~s/^http\:\/\///;
1409: #$currenturl=~s/^[^\/]+//;
1410:
1411: $here = $jump = &Apache::lonnet::symbread($currenturl);
1412: }
1413:
1414: # Step three: Ensure the folders are open
1415: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1416: my $curRes;
1417: my $found = 0;
1418:
1419: # We only need to do this if we need to open the maps to show the
1420: # current position. This will change the counter so we can't count
1421: # for the jump marker with this loop.
1422: while ($here && ($curRes = $mapIterator->next()) && !$found) {
1423: if (ref($curRes) && $curRes->symb() eq $here) {
1424: my $mapStack = $mapIterator->getStack();
1425:
1426: # Ensure the parent maps are open
1427: for my $map (@{$mapStack}) {
1428: if ($condition) {
1429: undef $filterHash->{$map->map_pc()};
1430: } else {
1431: $filterHash->{$map->map_pc()} = 1;
1432: }
1433: }
1434: $found = 1;
1435: }
1436: }
1437: }
1438:
1439: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1440: # If this is a click on a folder or something, we want to preserve the "here"
1441: # from the querystring, and get the new "jump" marker
1442: $here = $ENV{'form.here'};
1443: $jump = $ENV{'form.jump'};
1444: }
1445:
1446: my $it = $args->{'iterator'};
1447: if (!defined($it)) {
1448: # Construct a default iterator based on $ENV{'form.'} information
1449:
1450: # Step 1: Check to see if we have a navmap
1451: if (!defined($navmap)) {
1452: $navmap = Apache::lonnavmaps::navmap->new();
1453: $mustCloseNavMap = 1;
1454: }
1455:
1456: # See if we're being passed a specific map
1457: if ($args->{'iterator_map'}) {
1458: my $map = $args->{'iterator_map'};
1459: $map = $navmap->getResourceByUrl($map);
1460: my $firstResource = $map->map_start();
1461: my $finishResource = $map->map_finish();
1462:
1463: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1464: } else {
1465: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1466: }
1467: }
1468:
1469: # (re-)Locate the jump point, if any
1470: # Note this does not take filtering or hidden into account... need
1471: # to be fixed?
1472: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1473: my $curRes;
1474: my $foundJump = 0;
1475: my $counter = 0;
1476:
1477: while (($curRes = $mapIterator->next()) && !$foundJump) {
1478: if (ref($curRes)) { $counter++; }
1479:
1480: if (ref($curRes) && $jump eq $curRes->symb()) {
1481:
1482: # This is why we have to use the main iterator instead of the
1483: # potentially faster DFS: The count has to be the same, so
1484: # the order has to be the same, which DFS won't give us.
1485: $args->{'currentJumpIndex'} = $counter;
1486: $foundJump = 1;
1487: }
1488: }
1489:
1490: my $showParts = setDefault($args->{'showParts'}, 1);
1491: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1492: # keeps track of when the current resource is found,
1493: # so we can back up a few and put the anchor above the
1494: # current resource
1495: my $printKey = $args->{'printKey'};
1496: my $printCloseAll = $args->{'printCloseAll'};
1497: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1498:
1499: # Print key?
1500: if ($printKey) {
1501: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1502: my $date=localtime;
1503: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1504: my $location=&Apache::loncommon::lonhttpdurl("/adm/lonMisc");
1505: if ($navmap->{LAST_CHECK}) {
1506: $result .=
1507: '<img src="'.$location.'/chat.gif"> '.&mt('New discussion since').' '.
1508: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1509: '</td><td align="center" valign="bottom"> '.
1510: '<img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').'<p>'.
1511: '</td>';
1512: } else {
1513: $result .= '<td align="center" valign="bottom"> '.
1514: '<img src="'.$location.'/chat.gif"> '.&mt('Discussions').'</td><td align="center" valign="bottom">'.
1515: ' <img src="'.$location.'/feedback.gif"> '.&mt('New message (click to open)').
1516: '</td>';
1517: }
1518:
1519: $result .= '</tr></table>';
1520: }
1521:
1522: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1523: my ($link,$text);
1524: if ($condition) {
1525: $link='"navmaps?condition=0&filter=&'.$queryString.
1526: '&here='.&Apache::lonnet::escape($here).'"';
1527: $text='Close All Folders';
1528: } else {
1529: $link='"navmaps?condition=1&filter=&'.$queryString.
1530: '&here='.&Apache::lonnet::escape($here).'"';
1531: $text='Open All Folders';
1532: }
1533: if ($args->{'caller'} eq 'navmapsdisplay') {
1534: &add_linkitem($args->{'linkitems'},'changefolder',
1535: 'location.href='.$link,$text);
1536: } else {
1537: $result.='<a href='.$link.'>'.&mt($text).'</a>';
1538: }
1539: $result .= "\n";
1540: }
1541:
1542: # Check for any unread discussions in all resources.
1543: if ($args->{'caller'} eq 'navmapsdisplay') {
1544: &add_linkitem($args->{'linkitems'},'clearbubbles',
1545: 'document.clearbubbles.submit()',
1546: 'Mark all posts read');
1547: my $time=time;
1548: $result .= (<<END);
1549: <form name="clearbubbles" method="post" action="/adm/feedback">
1550: <input type="hidden" name="navurl" value="$ENV{'QUERY_STRING'}" />
1551: <input type="hidden" name="navtime" value="$time" />
1552: END
1553: if ($args->{'sort'} eq 'discussion') {
1554: my $totdisc = 0;
1555: my $haveDisc = '';
1556: my @allres=$navmap->retrieveResources();
1557: foreach my $resource (@allres) {
1558: if ($resource->hasDiscussion()) {
1559: my $ressymb;
1560: if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
1561: $ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
1562: } else {
1563: $ressymb = $resource->symb();
1564: }
1565: $haveDisc .= $ressymb.':';
1566: $totdisc ++;
1567: }
1568: }
1569: if ($totdisc > 0) {
1570: $haveDisc =~ s/:$//;
1571: $result .= (<<END);
1572: <input type="hidden" name="navmaps" value="$haveDisc" />
1573: </form>
1574: END
1575: }
1576: }
1577: $result.='</form>';
1578: }
1579:
1580: if ($args->{'caller'} eq 'navmapsdisplay') {
1581: $result .= '<table><tr><td>'.
1582: &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT').'</td>';
1583: if ($ENV{'environment.remotenavmap'} ne 'on') {
1584: $result .= '<td> </td>';
1585: } else {
1586: $result .= '</tr><tr>';
1587: }
1588: $result.=&show_linkitems($args->{'linkitems'});
1589: if ($args->{'sort_html'}) {
1590: if ($ENV{'environment.remotenavmap'} ne 'on') {
1591: $result.='<td> </td><td> </td><td> </td>'.
1592: '<td align="right">'.$args->{'sort_html'}.'</td></tr>';
1593: } else {
1594: $result.='</tr><tr><td align="left"><br />'.
1595: $args->{'sort_html'}.'</td></tr>';
1596: }
1597: }
1598: $result .= '</table>';
1599: } elsif ($args->{'sort_html'}) {
1600: $result.=$args->{'sort_html'};
1601: }
1602:
1603: $result .= "<br />\n";
1604: if ($r) {
1605: $r->print($result);
1606: $r->rflush();
1607: $result = "";
1608: }
1609: # End parameter setting
1610:
1611: # Data
1612: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1613: my $res = "Apache::lonnavmaps::resource";
1614: my %condenseStatuses =
1615: ( $res->NETWORK_FAILURE => 1,
1616: $res->NOTHING_SET => 1,
1617: $res->CORRECT => 1 );
1618: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1619:
1620: # Shared variables
1621: $args->{'counter'} = 0; # counts the rows
1622: $args->{'indentLevel'} = 0;
1623: $args->{'isNewBranch'} = 0;
1624: $args->{'condensed'} = 0;
1625: my $location=
1626: &Apache::loncommon::lonhttpdurl("/adm/lonIcons/whitespace1.gif");
1627: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' width='25' height='1' alt='' border='0' />");
1628: $args->{'displayedHereMarker'} = 0;
1629:
1630: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1631: # since structure actually doesn't matter, except what map has what resources.
1632: if ($args->{'suppressEmptySequences'}) {
1633: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1634: $it->{FIRST_RESOURCE},
1635: $it->{FINISH_RESOURCE},
1636: {}, undef, 1);
1637: my $depth = 0;
1638: $dfsit->next();
1639: my $curRes = $dfsit->next();
1640: while ($depth > -1) {
1641: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1642: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1643:
1644: if (ref($curRes)) {
1645: # Parallel pre-processing: Do sequences have non-filtered-out children?
1646: if ($curRes->is_map()) {
1647: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1648: # Sequences themselves do not count as visible children,
1649: # unless those sequences also have visible children.
1650: # This means if a sequence appears, there's a "promise"
1651: # that there's something under it if you open it, somewhere.
1652: } else {
1653: # Not a sequence: if it's filtered, ignore it, otherwise
1654: # rise up the stack and mark the sequences as having children
1655: if (&$filterFunc($curRes)) {
1656: for my $sequence (@{$dfsit->getStack()}) {
1657: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1658: }
1659: }
1660: }
1661: }
1662: } continue {
1663: $curRes = $dfsit->next();
1664: }
1665: }
1666:
1667: my $displayedJumpMarker = 0;
1668: # Set up iteration.
1669: my $now = time();
1670: my $in24Hours = $now + 24 * 60 * 60;
1671: my $rownum = 0;
1672:
1673: # export "here" marker information
1674: $args->{'here'} = $here;
1675:
1676: $args->{'indentLevel'} = -1; # first BEGIN_MAP takes this to 0
1677: my @resources;
1678: my $code='';# sub { !(shift->is_map();) };
1679: if ($args->{'sort'} eq 'title') {
1680: my $oldFilterFunc = $filterFunc;
1681: my $filterFunc=
1682: sub {
1683: my ($res)=@_;
1684: if ($res->is_map()) { return 0;}
1685: return &$oldFilterFunc($res);
1686: };
1687: @resources=$navmap->retrieveResources(undef,$filterFunc);
1688: @resources= sort { &cmp_title($a,$b) } @resources;
1689: } elsif ($args->{'sort'} eq 'duedate') {
1690: my $oldFilterFunc = $filterFunc;
1691: my $filterFunc=
1692: sub {
1693: my ($res)=@_;
1694: if (!$res->is_problem()) { return 0;}
1695: return &$oldFilterFunc($res);
1696: };
1697: @resources=$navmap->retrieveResources(undef,$filterFunc);
1698: @resources= sort {
1699: if ($a->duedate ne $b->duedate) {
1700: return $a->duedate cmp $b->duedate;
1701: }
1702: my $value=&cmp_title($a,$b);
1703: return $value;
1704: } @resources;
1705: } elsif ($args->{'sort'} eq 'discussion') {
1706: my $oldFilterFunc = $filterFunc;
1707: my $filterFunc=
1708: sub {
1709: my ($res)=@_;
1710: if (!$res->hasDiscussion() &&
1711: !$res->getFeedback() &&
1712: !$res->getErrors()) { return 0;}
1713: return &$oldFilterFunc($res);
1714: };
1715: @resources=$navmap->retrieveResources(undef,$filterFunc);
1716: @resources= sort { &cmp_title($a,$b) } @resources;
1717: } else {
1718: #unknow sort mechanism or default
1719: undef($args->{'sort'});
1720: }
1721:
1722:
1723: while (1) {
1724: if ($args->{'sort'}) {
1725: $curRes = shift(@resources);
1726: } else {
1727: $curRes = $it->next($closeAllPages);
1728: }
1729: if (!$curRes) { last; }
1730:
1731: # Maintain indentation level.
1732: if ($curRes == $it->BEGIN_MAP() ||
1733: $curRes == $it->BEGIN_BRANCH() ) {
1734: $args->{'indentLevel'}++;
1735: }
1736: if ($curRes == $it->END_MAP() ||
1737: $curRes == $it->END_BRANCH() ) {
1738: $args->{'indentLevel'}--;
1739: }
1740: # Notice new branches
1741: if ($curRes == $it->BEGIN_BRANCH()) {
1742: $args->{'isNewBranch'} = 1;
1743: }
1744:
1745: # If this isn't an actual resource, continue on
1746: if (!ref($curRes)) {
1747: next;
1748: }
1749:
1750: # If this has been filtered out, continue on
1751: if (!(&$filterFunc($curRes))) {
1752: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1753: next;
1754: }
1755:
1756: # If this is an empty sequence and we're filtering them, continue on
1757: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1758: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1759: next;
1760: }
1761:
1762: # If we're suppressing navmaps and this is a navmap, continue on
1763: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1764: next;
1765: }
1766:
1767: $args->{'counter'}++;
1768:
1769: # Does it have multiple parts?
1770: $args->{'multipart'} = 0;
1771: $args->{'condensed'} = 0;
1772: my @parts;
1773:
1774: # Decide what parts to show.
1775: if ($curRes->is_problem() && $showParts) {
1776: @parts = @{$curRes->parts()};
1777: $args->{'multipart'} = $curRes->multipart();
1778:
1779: if ($condenseParts) { # do the condensation
1780: if (!$curRes->opendate("0")) {
1781: @parts = ();
1782: $args->{'condensed'} = 1;
1783: }
1784: if (!$args->{'condensed'}) {
1785: # Decide whether to condense based on similarity
1786: my $status = $curRes->status($parts[0]);
1787: my $due = $curRes->duedate($parts[0]);
1788: my $open = $curRes->opendate($parts[0]);
1789: my $statusAllSame = 1;
1790: my $dueAllSame = 1;
1791: my $openAllSame = 1;
1792: for (my $i = 1; $i < scalar(@parts); $i++) {
1793: if ($curRes->status($parts[$i]) != $status){
1794: $statusAllSame = 0;
1795: }
1796: if ($curRes->duedate($parts[$i]) != $due ) {
1797: $dueAllSame = 0;
1798: }
1799: if ($curRes->opendate($parts[$i]) != $open) {
1800: $openAllSame = 0;
1801: }
1802: }
1803: # $*allSame is true if all the statuses were
1804: # the same. Now, if they are all the same and
1805: # match one of the statuses to condense, or they
1806: # are all open with the same due date, or they are
1807: # all OPEN_LATER with the same open date, display the
1808: # status of the first non-zero part (to get the 'correct'
1809: # status right, since 0 is never 'correct' or 'open').
1810: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1811: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1812: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1813: @parts = ($parts[0]);
1814: $args->{'condensed'} = 1;
1815: }
1816: }
1817: # Multipart problem with one part: always "condense" (happens
1818: # to match the desirable behavior)
1819: if ($curRes->countParts() == 1) {
1820: @parts = ($parts[0]);
1821: $args->{'condensed'} = 1;
1822: }
1823: }
1824: }
1825:
1826: # If the multipart problem was condensed, "forget" it was multipart
1827: if (scalar(@parts) == 1) {
1828: $args->{'multipart'} = 0;
1829: } else {
1830: # Add part 0 so we display it correctly.
1831: unshift @parts, '0';
1832: }
1833:
1834: # Now, we've decided what parts to show. Loop through them and
1835: # show them.
1836: foreach my $part (@parts) {
1837: $rownum ++;
1838: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1839:
1840: $result .= " <tr bgcolor='$backgroundColor'>\n";
1841:
1842: # Set up some data about the parts that the cols might want
1843: my $filter = $it->{FILTER};
1844: my $src;
1845: if ($args->{'sort'}) {
1846: $src = $curRes->src(); # FIXME this is wrong for .pages
1847: } else {
1848: my $stack = $it->getStack();
1849: $src=getLinkForResource($stack);
1850: }
1851: my $anchor='';
1852: if ($src=~s/(\#.*)$//) {
1853: $anchor=$1;
1854: }
1855: my $srcHasQuestion = $src =~ /\?/;
1856: $args->{"resourceLink"} = $src.
1857: ($srcHasQuestion?'&':'?') .
1858: 'symb=' . &Apache::lonnet::escape($curRes->shown_symb()).
1859: $anchor;
1860:
1861: # Now, display each column.
1862: foreach my $col (@$cols) {
1863: my $colHTML = '';
1864: if (ref($col)) {
1865: $colHTML .= &$col($curRes, $part, $args);
1866: } else {
1867: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1868: }
1869:
1870: # If this is the first column and it's time to print
1871: # the anchor, do so
1872: if ($col == $cols->[0] &&
1873: $args->{'counter'} == $args->{'currentJumpIndex'} -
1874: $currentJumpDelta) {
1875: # Jam the anchor after the <td> tag;
1876: # necessary for valid HTML (which Mozilla requires)
1877: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1878: $displayedJumpMarker = 1;
1879: }
1880: $result .= $colHTML . "\n";
1881: }
1882: $result .= " </tr>\n";
1883: $args->{'isNewBranch'} = 0;
1884: }
1885:
1886: if ($r && $rownum % 20 == 0) {
1887: $r->print($result);
1888: $result = "";
1889: $r->rflush();
1890: }
1891: } continue {
1892: if ($r) {
1893: # If we have the connection, make sure the user is still connected
1894: my $c = $r->connection;
1895: if ($c->aborted()) {
1896: # Who cares what we do, nobody will see it anyhow.
1897: return '';
1898: }
1899: }
1900: }
1901:
1902: # Print out the part that jumps to #curloc if it exists
1903: # delay needed because the browser is processing the jump before
1904: # it finishes rendering, so it goes to the wrong place!
1905: # onload might be better, but this routine has no access to that.
1906: # On mozilla, the 0-millisecond timeout seems to prevent this;
1907: # it's quite likely this might fix other browsers, too, and
1908: # certainly won't hurt anything.
1909: if ($displayedJumpMarker) {
1910: $result .= "
1911: <script>
1912: if (location.href.indexOf('#curloc')==-1) {
1913: setTimeout(\"location += '#curloc';\", 0)
1914: }
1915: </script>";
1916: }
1917:
1918: $result .= "</table>";
1919:
1920: if ($r) {
1921: $r->print($result);
1922: $result = "";
1923: $r->rflush();
1924: }
1925:
1926: return $result;
1927: }
1928:
1929: sub add_linkitem {
1930: my ($linkitems,$name,$cmd,$text)=@_;
1931: $$linkitems{$name}{'cmd'}=$cmd;
1932: $$linkitems{$name}{'text'}=&mt($text);
1933: }
1934:
1935: sub show_linkitems {
1936: my ($linkitems)=@_;
1937: my @linkorder = ("launchnav","closenav","firsthomework","everything",
1938: "uncompleted","changefolder","clearbubbles");
1939:
1940: my $result .= (<<ENDBLOCK);
1941: <td align="left">
1942: <script type="text/javascript">
1943: function changeNavDisplay () {
1944: var navchoice = document.linkitems.toplink[document.linkitems.toplink.selectedIndex].value;
1945: ENDBLOCK
1946: foreach my $link (@linkorder) {
1947: $result.= "if (navchoice == '$link') {".
1948: $linkitems->{$link}{'cmd'}."}\n";
1949: }
1950: $result.='}
1951: </script>
1952: <form name="linkitems" method="post">
1953: <nobr><select name="toplink">'."\n";
1954: foreach my $link (@linkorder) {
1955: if (defined($linkitems->{$link})) {
1956: if ($linkitems->{$link}{'text'} ne '') {
1957: $result .= ' <option value="'.$link.'">'.
1958: $linkitems->{$link}{'text'}."</option>\n";
1959: }
1960: }
1961: }
1962: $result .= '</select> <input type="button" name="chgnav"
1963: value="Go" onClick="javascript:changeNavDisplay()" />
1964: </nobr></form></td>'."\n";
1965:
1966: return $result;
1967: }
1968:
1969: 1;
1970:
1971: package Apache::lonnavmaps::navmap;
1972:
1973: =pod
1974:
1975: =head1 Object: Apache::lonnavmaps::navmap
1976:
1977: =head2 Overview
1978:
1979: The navmap object's job is to provide access to the resources
1980: in the course as Apache::lonnavmaps::resource objects, and to
1981: query and manage the relationship between those resource objects.
1982:
1983: Generally, you'll use the navmap object in one of three basic ways.
1984: In order of increasing complexity and power:
1985:
1986: =over 4
1987:
1988: =item * C<$navmap-E<gt>getByX>, where X is B<Id>, B<Symb>, B<Url> or B<MapPc>. This provides
1989: various ways to obtain resource objects, based on various identifiers.
1990: Use this when you want to request information about one object or
1991: a handful of resources you already know the identities of, from some
1992: other source. For more about Ids, Symbs, and MapPcs, see the
1993: Resource documentation. Note that Url should be a B<last resort>,
1994: not your first choice; it only works when there is only one
1995: instance of the resource in the course, which only applies to
1996: maps, and even that may change in the future.
1997:
1998: =item * C<my @resources = $navmap-E<gt>retrieveResources(args)>. This
1999: retrieves resources matching some criterion and returns them
2000: in a flat array, with no structure information. Use this when
2001: you are manipulating a series of resources, based on what map
2002: the are in, but do not care about branching, or exactly how
2003: the maps and resources are related. This is the most common case.
2004:
2005: =item * C<$it = $navmap-E<gt>getIterator(args)>. This allows you traverse
2006: the course's navmap in various ways without writing the traversal
2007: code yourself. See iterator documentation below. Use this when
2008: you need to know absolutely everything about the course, including
2009: branches and the precise relationship between maps and resources.
2010:
2011: =back
2012:
2013: =head2 Creation And Destruction
2014:
2015: To create a navmap object, use the following function:
2016:
2017: =over 4
2018:
2019: =item * B<Apache::lonnavmaps::navmap-E<gt>new>():
2020:
2021: Creates a new navmap object. Returns the navmap object if this is
2022: successful, or B<undef> if not.
2023:
2024: =back
2025:
2026: =head2 Methods
2027:
2028: =over 4
2029:
2030: =item * B<getIterator>(first, finish, filter, condition):
2031:
2032: See iterator documentation below.
2033:
2034: =cut
2035:
2036: use strict;
2037: use GDBM_File;
2038:
2039: sub new {
2040: # magic invocation to create a class instance
2041: my $proto = shift;
2042: my $class = ref($proto) || $proto;
2043: my $self = {};
2044:
2045: # Resource cache stores navmap resources as we reference them. We generate
2046: # them on-demand so we don't pay for creating resources unless we use them.
2047: $self->{RESOURCE_CACHE} = {};
2048:
2049: # Network failure flag, if we accessed the course or user opt and
2050: # failed
2051: $self->{NETWORK_FAILURE} = 0;
2052:
2053: # tie the nav hash
2054:
2055: my %navmaphash;
2056: my %parmhash;
2057: my $courseFn = $ENV{"request.course.fn"};
2058: if (!(tie(%navmaphash, 'GDBM_File', "${courseFn}.db",
2059: &GDBM_READER(), 0640))) {
2060: return undef;
2061: }
2062:
2063: if (!(tie(%parmhash, 'GDBM_File', "${courseFn}_parms.db",
2064: &GDBM_READER(), 0640)))
2065: {
2066: untie %{$self->{PARM_HASH}};
2067: return undef;
2068: }
2069:
2070: $self->{NAV_HASH} = \%navmaphash;
2071: $self->{PARM_HASH} = \%parmhash;
2072: $self->{PARM_CACHE} = {};
2073:
2074: bless($self);
2075:
2076: return $self;
2077: }
2078:
2079: sub generate_course_user_opt {
2080: my $self = shift;
2081: if ($self->{COURSE_USER_OPT_GENERATED}) { return; }
2082:
2083: my $uname=$ENV{'user.name'};
2084: my $udom=$ENV{'user.domain'};
2085: my $uhome=$ENV{'user.home'};
2086: my $cid=$ENV{'request.course.id'};
2087: my $chome=$ENV{'course.'.$cid.'.home'};
2088: my ($cdom,$cnum)=split(/\_/,$cid);
2089:
2090: my $userprefix=$uname.'_'.$udom.'_';
2091:
2092: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
2093: unless ($uhome eq 'no_host') {
2094: # ------------------------------------------------- Get coursedata (if present)
2095: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
2096: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
2097: ':resourcedata',$chome);
2098: # Check for network failure
2099: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
2100: $self->{NETWORK_FAILURE} = 1;
2101: } elsif ($reply!~/^error\:/) {
2102: $courserdatas{$cid}=$reply;
2103: $courserdatas{$cid.'.last_cache'}=time;
2104: }
2105: }
2106: foreach (split(/\&/,$courserdatas{$cid})) {
2107: my ($name,$value)=split(/\=/,$_);
2108: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
2109: &Apache::lonnet::unescape($value);
2110: }
2111: # --------------------------------------------------- Get userdata (if present)
2112: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
2113: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
2114: if ($reply!~/^error\:/) {
2115: $userrdatas{$uname.'___'.$udom}=$reply;
2116: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
2117: }
2118: # check to see if network failed
2119: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
2120: {
2121: $self->{NETWORK_FAILURE} = 1;
2122: }
2123: }
2124: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
2125: my ($name,$value)=split(/\=/,$_);
2126: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
2127: &Apache::lonnet::unescape($value);
2128: }
2129: $self->{COURSE_OPT} = \%courseopt;
2130: $self->{USER_OPT} = \%useropt;
2131: }
2132:
2133: $self->{COURSE_USER_OPT_GENERATED} = 1;
2134:
2135: return;
2136: }
2137:
2138: sub generate_email_discuss_status {
2139: my $self = shift;
2140: my $symb = shift;
2141: if ($self->{EMAIL_DISCUSS_GENERATED}) { return; }
2142:
2143: my $cid=$ENV{'request.course.id'};
2144: my ($cdom,$cnum)=split(/\_/,$cid);
2145:
2146: my %emailstatus = &Apache::lonnet::dump('email_status');
2147: my $logoutTime = $emailstatus{'logout'};
2148: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
2149: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
2150: $courseLeaveTime : $logoutTime);
2151: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
2152: $cdom, $cnum);
2153: my %lastread = &Apache::lonnet::dump('nohist_'.$cid.'_discuss',
2154: $ENV{'user.domain'},$ENV{'user.name'},'lastread');
2155: my %lastreadtime = ();
2156: foreach (keys %lastread) {
2157: my $key = $_;
2158: $key =~ s/_lastread$//;
2159: $lastreadtime{$key} = $lastread{$_};
2160: }
2161:
2162: my %feedback=();
2163: my %error=();
2164: my $keys = &Apache::lonnet::reply('keys:'.
2165: $ENV{'user.domain'}.':'.
2166: $ENV{'user.name'}.':nohist_email',
2167: $ENV{'user.home'});
2168:
2169: foreach my $msgid (split(/\&/, $keys)) {
2170: $msgid=&Apache::lonnet::unescape($msgid);
2171: if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
2172: my $plain=
2173: &Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
2174: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
2175: my ($what,$url)=($1,$2);
2176: if ($what eq 'Error') {
2177: $error{$url}.=','.$msgid;
2178: } else {
2179: $feedback{$url}.=','.$msgid;
2180: }
2181: }
2182: }
2183: }
2184:
2185: #url's of resources that have feedbacks
2186: $self->{FEEDBACK} = \%feedback;
2187: #or errors
2188: $self->{ERROR_MSG} = \%error;
2189: $self->{DISCUSSION_TIME} = \%discussiontime;
2190: $self->{EMAIL_STATUS} = \%emailstatus;
2191: $self->{LAST_READ} = \%lastreadtime;
2192:
2193: $self->{EMAIL_DISCUSS_GENERATED} = 1;
2194: }
2195:
2196: sub get_user_data {
2197: my $self = shift;
2198: if ($self->{RETRIEVED_USER_DATA}) { return; }
2199:
2200: # Retrieve performance data on problems
2201: my %student_data = Apache::lonnet::currentdump($ENV{'request.course.id'},
2202: $ENV{'user.domain'},
2203: $ENV{'user.name'});
2204: $self->{STUDENT_DATA} = \%student_data;
2205:
2206: $self->{RETRIEVED_USER_DATA} = 1;
2207: }
2208:
2209: # Internal function: Takes a key to look up in the nav hash and implements internal
2210: # memory caching of that key.
2211: sub navhash {
2212: my $self = shift; my $key = shift;
2213: return $self->{NAV_HASH}->{$key};
2214: }
2215:
2216: =pod
2217:
2218: =item * B<courseMapDefined>(): Returns true if the course map is defined,
2219: false otherwise. Undefined course maps indicate an error somewhere in
2220: LON-CAPA, and you will not be able to proceed with using the navmap.
2221: See the B<NAV> screen for an example of using this.
2222:
2223: =cut
2224:
2225: # Checks to see if coursemap is defined, matching test in old lonnavmaps
2226: sub courseMapDefined {
2227: my $self = shift;
2228: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
2229:
2230: my $firstres = $self->navhash("map_start_$uri");
2231: my $lastres = $self->navhash("map_finish_$uri");
2232: return $firstres && $lastres;
2233: }
2234:
2235: sub getIterator {
2236: my $self = shift;
2237: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
2238: shift, undef, shift);
2239: return $iterator;
2240: }
2241:
2242: # Private method: Does the given resource (as a symb string) have
2243: # current discussion? Returns 0 if chat/mail data not extracted.
2244: sub hasDiscussion {
2245: my $self = shift;
2246: my $symb = shift;
2247:
2248: $self->generate_email_discuss_status();
2249:
2250: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
2251:
2252: #return defined($self->{DISCUSSION_TIME}->{$symb});
2253:
2254: # backward compatibility (bulletin boards used to be 'wrapped')
2255: my $ressymb = $symb;
2256: if ($ressymb =~ m|adm/(\w+)/(\w+)/(\d+)/bulletinboard$|) {
2257: unless ($ressymb =~ m|adm/wrapper/adm|) {
2258: $ressymb = 'bulletin___'.$3.'___adm/wrapper/adm/'.$1.'/'.$2.'/'.$3.'/bulletinboard';
2259: }
2260: }
2261:
2262: if ( defined ( $self->{LAST_READ}->{$ressymb} ) ) {
2263: return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_READ}->{$ressymb};
2264: } else {
2265: # return $self->{DISCUSSION_TIME}->{$ressymb} > $self->{LAST_CHECK}; # v.1.1 behavior
2266: return $self->{DISCUSSION_TIME}->{$ressymb} > 0; # in 1.2 will display speech bubble icons for all items with posts until marked as read (even if read in v 1.1).
2267: }
2268: }
2269:
2270: # Private method: Does the given resource (as a symb string) have
2271: # current feedback? Returns the string in the feedback hash, which
2272: # will be false if it does not exist.
2273: sub getFeedback {
2274: my $self = shift;
2275: my $symb = shift;
2276:
2277: $self->generate_email_discuss_status();
2278:
2279: if (!defined($self->{FEEDBACK})) { return ""; }
2280:
2281: return $self->{FEEDBACK}->{$symb};
2282: }
2283:
2284: # Private method: Get the errors for that resource (by source).
2285: sub getErrors {
2286: my $self = shift;
2287: my $src = shift;
2288:
2289: $self->generate_email_discuss_status();
2290:
2291: if (!defined($self->{ERROR_MSG})) { return ""; }
2292: return $self->{ERROR_MSG}->{$src};
2293: }
2294:
2295: =pod
2296:
2297: =item * B<getById>(id):
2298:
2299: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
2300: object for that resource. This method, or other methods that use it
2301: (as in the resource object) is the only proper way to obtain a
2302: resource object.
2303:
2304: =item * B<getBySymb>(symb):
2305:
2306: Based on the symb of the resource, get a resource object for that
2307: resource. This is one of the proper ways to get a resource object.
2308:
2309: =item * B<getMapByMapPc>(map_pc):
2310:
2311: Based on the map_pc of the resource, get a resource object for
2312: the given map. This is one of the proper ways to get a resource object.
2313:
2314: =cut
2315:
2316: # The strategy here is to cache the resource objects, and only construct them
2317: # as we use them. The real point is to prevent reading any more from the tied
2318: # hash then we have to, which should hopefully alleviate speed problems.
2319:
2320: sub getById {
2321: my $self = shift;
2322: my $id = shift;
2323:
2324: if (defined ($self->{RESOURCE_CACHE}->{$id}))
2325: {
2326: return $self->{RESOURCE_CACHE}->{$id};
2327: }
2328:
2329: # resource handles inserting itself into cache.
2330: # Not clear why the quotes are necessary, but as of this
2331: # writing it doesn't work without them.
2332: return "Apache::lonnavmaps::resource"->new($self, $id);
2333: }
2334:
2335: sub getBySymb {
2336: my $self = shift;
2337: my $symb = shift;
2338:
2339: my ($mapUrl, $id, $filename) = &Apache::lonnet::decode_symb($symb);
2340: my $map = $self->getResourceByUrl($mapUrl);
2341: my $returnvalue = undef;
2342: if (ref($map)) {
2343: $returnvalue = $self->getById($map->map_pc() .'.'.$id);
2344: }
2345: return $returnvalue;
2346: }
2347:
2348: sub getByMapPc {
2349: my $self = shift;
2350: my $map_pc = shift;
2351: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
2352: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
2353: return $self->getById($map_id);
2354: }
2355:
2356: =pod
2357:
2358: =item * B<firstResource>():
2359:
2360: Returns a resource object reference corresponding to the first
2361: resource in the navmap.
2362:
2363: =cut
2364:
2365: sub firstResource {
2366: my $self = shift;
2367: my $firstResource = $self->navhash('map_start_' .
2368: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2369: return $self->getById($firstResource);
2370: }
2371:
2372: =pod
2373:
2374: =item * B<finishResource>():
2375:
2376: Returns a resource object reference corresponding to the last resource
2377: in the navmap.
2378:
2379: =cut
2380:
2381: sub finishResource {
2382: my $self = shift;
2383: my $firstResource = $self->navhash('map_finish_' .
2384: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
2385: return $self->getById($firstResource);
2386: }
2387:
2388: # Parmval reads the parm hash and cascades the lookups. parmval_real does
2389: # the actual lookup; parmval caches the results.
2390: sub parmval {
2391: my $self = shift;
2392: my ($what,$symb)=@_;
2393: my $hashkey = $what."|||".$symb;
2394:
2395: if (defined($self->{PARM_CACHE}->{$hashkey})) {
2396: return $self->{PARM_CACHE}->{$hashkey};
2397: }
2398:
2399: my $result = $self->parmval_real($what, $symb);
2400: $self->{PARM_CACHE}->{$hashkey} = $result;
2401: return $result;
2402: }
2403:
2404: sub parmval_real {
2405: my $self = shift;
2406: my ($what,$symb,$recurse) = @_;
2407:
2408: # Make sure the {USER_OPT} and {COURSE_OPT} hashes are populated
2409: $self->generate_course_user_opt();
2410:
2411: my $cid=$ENV{'request.course.id'};
2412: my $csec=$ENV{'request.course.sec'};
2413: my $uname=$ENV{'user.name'};
2414: my $udom=$ENV{'user.domain'};
2415:
2416: unless ($symb) { return ''; }
2417: my $result='';
2418:
2419: my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
2420:
2421: # ----------------------------------------------------- Cascading lookup scheme
2422: my $rwhat=$what;
2423: $what=~s/^parameter\_//;
2424: $what=~s/\_/\./;
2425:
2426: my $symbparm=$symb.'.'.$what;
2427: my $mapparm=$mapname.'___(all).'.$what;
2428: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
2429:
2430: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
2431: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
2432: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
2433:
2434: my $courselevel= $usercourseprefix.'.'.$what;
2435: my $courselevelr=$usercourseprefix.'.'.$symbparm;
2436: my $courselevelm=$usercourseprefix.'.'.$mapparm;
2437:
2438: my $useropt = $self->{USER_OPT};
2439: my $courseopt = $self->{COURSE_OPT};
2440: my $parmhash = $self->{PARM_HASH};
2441:
2442: # ---------------------------------------------------------- first, check user
2443: if ($uname and defined($useropt)) {
2444: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
2445: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
2446: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
2447: }
2448:
2449: # ------------------------------------------------------- second, check course
2450: if ($csec and defined($courseopt)) {
2451: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
2452: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
2453: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
2454: }
2455:
2456: if (defined($courseopt)) {
2457: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
2458: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
2459: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
2460: }
2461:
2462: # ----------------------------------------------------- third, check map parms
2463:
2464: my $thisparm=$$parmhash{$symbparm};
2465: if (defined($thisparm)) { return $thisparm; }
2466:
2467: # ----------------------------------------------------- fourth , check default
2468:
2469: my $meta_rwhat=$rwhat;
2470: $meta_rwhat=~s/\./_/g;
2471: my $default=&Apache::lonnet::metadata($fn,$meta_rwhat);
2472: if (defined($default)) { return $default}
2473: $default=&Apache::lonnet::metadata($fn,'parameter_'.$meta_rwhat);
2474: if (defined($default)) { return $default}
2475:
2476: # --------------------------------------------------- fifth , cascade up parts
2477:
2478: my ($space,@qualifier)=split(/\./,$rwhat);
2479: my $qualifier=join('.',@qualifier);
2480: unless ($space eq '0') {
2481: my @parts=split(/_/,$space);
2482: my $id=pop(@parts);
2483: my $part=join('_',@parts);
2484: if ($part eq '') { $part='0'; }
2485: my $partgeneral=$self->parmval($part.".$qualifier",$symb,1);
2486: if (defined($partgeneral)) { return $partgeneral; }
2487: }
2488: if ($recurse) { return undef; }
2489: my $pack_def=&Apache::lonnet::packages_tab_default($fn,'resource.'.$what);
2490: if (defined($pack_def)) { return $pack_def; }
2491: return '';
2492: }
2493:
2494: =pod
2495:
2496: =item * B<getResourceByUrl>(url):
2497:
2498: Retrieves a resource object by URL of the resource. If passed a
2499: resource object, it will simply return it, so it is safe to use this
2500: method in code like "$res = $navmap->getResourceByUrl($res)", if
2501: you're not sure if $res is already an object, or just a URL. If the
2502: resource appears multiple times in the course, only the first instance
2503: will be returned. As a result, this is probably useful only for maps.
2504:
2505: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
2506:
2507: The map is a specification of a map to retreive the resources from,
2508: either as a url or as an object. The filterFunc is a reference to a
2509: function that takes a resource object as its one argument and returns
2510: true if the resource should be included, or false if it should not
2511: be. If recursive is true, the map will be recursively examined,
2512: otherwise it will not be. If bailout is true, the function will return
2513: as soon as it finds a resource, if false it will finish. By default,
2514: the map is the top-level map of the course, filterFunc is a function
2515: that always returns 1, recursive is true, bailout is false. The
2516: resources will be returned in a list containing the resource objects
2517: for the corresponding resources, with B<no structure information> in
2518: the list; regardless of branching, recursion, etc., it will be a flat
2519: list.
2520:
2521: Thus, this is suitable for cases where you don't want the structure,
2522: just a list of all resources. It is also suitable for finding out how
2523: many resources match a given description; for this use, if all you
2524: want to know is if I<any> resources match the description, the bailout
2525: parameter will allow you to avoid potentially expensive enumeration of
2526: all matching resources.
2527:
2528: =item * B<hasResource>(map, filterFunc, recursive):
2529:
2530: Convience method for
2531:
2532: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2533:
2534: which will tell whether the map has resources matching the description
2535: in the filter function.
2536:
2537: =cut
2538:
2539:
2540: sub getResourceByUrl {
2541: my $self = shift;
2542: my $resUrl = shift;
2543:
2544: if (ref($resUrl)) { return $resUrl; }
2545:
2546: $resUrl = &Apache::lonnet::clutter($resUrl);
2547: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2548: if ($resId =~ /,/) {
2549: $resId = (split (/,/, $resId))[0];
2550: }
2551: if (!$resId) { return ''; }
2552: return $self->getById($resId);
2553: }
2554:
2555: sub retrieveResources {
2556: my $self = shift;
2557: my $map = shift;
2558: my $filterFunc = shift;
2559: if (!defined ($filterFunc)) {
2560: $filterFunc = sub {return 1;};
2561: }
2562: my $recursive = shift;
2563: if (!defined($recursive)) { $recursive = 1; }
2564: my $bailout = shift;
2565: if (!defined($bailout)) { $bailout = 0; }
2566:
2567: # Create the necessary iterator.
2568: if (!ref($map)) { # assume it's a url of a map.
2569: $map = $self->getResourceByUrl($map);
2570: }
2571:
2572: # If nothing was passed, assume top-level map
2573: if (!$map) {
2574: $map = $self->getById('0.0');
2575: }
2576:
2577: # Check the map's validity.
2578: if (!$map->is_map()) {
2579: # Oh, to throw an exception.... how I'd love that!
2580: return ();
2581: }
2582:
2583: # Get an iterator.
2584: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2585: undef, $recursive);
2586:
2587: my @resources = ();
2588:
2589: # Run down the iterator and collect the resources.
2590: my $curRes;
2591:
2592: while ($curRes = $it->next()) {
2593: if (ref($curRes)) {
2594: if (!&$filterFunc($curRes)) {
2595: next;
2596: }
2597:
2598: push @resources, $curRes;
2599:
2600: if ($bailout) {
2601: return @resources;
2602: }
2603: }
2604:
2605: }
2606:
2607: return @resources;
2608: }
2609:
2610: sub hasResource {
2611: my $self = shift;
2612: my $map = shift;
2613: my $filterFunc = shift;
2614: my $recursive = shift;
2615:
2616: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
2617: }
2618:
2619: 1;
2620:
2621: package Apache::lonnavmaps::iterator;
2622: use WeakRef;
2623: =pod
2624:
2625: =back
2626:
2627: =head1 Object: navmap Iterator
2628:
2629: An I<iterator> encapsulates the logic required to traverse a data
2630: structure. navmap uses an iterator to traverse the course map
2631: according to the criteria you wish to use.
2632:
2633: To obtain an iterator, call the B<getIterator>() function of a
2634: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2635: directly.) This will return a reference to the iterator:
2636:
2637: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2638:
2639: To get the next thing from the iterator, call B<next>:
2640:
2641: C<my $nextThing = $resourceIterator-E<gt>next()>
2642:
2643: getIterator behaves as follows:
2644:
2645: =over 4
2646:
2647: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2648:
2649: All parameters are optional. firstResource is a resource reference
2650: corresponding to where the iterator should start. It defaults to
2651: navmap->firstResource() for the corresponding nav map. finishResource
2652: corresponds to where you want the iterator to end, defaulting to
2653: navmap->finishResource(). filterHash is a hash used as a set
2654: containing strings representing the resource IDs, defaulting to
2655: empty. Condition is a 1 or 0 that sets what to do with the filter
2656: hash: If a 0, then only resources that exist IN the filterHash will be
2657: recursed on. If it is a 1, only resources NOT in the filterHash will
2658: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2659: false (default), the iterator will only return the first level of map
2660: that is not just a single, 'redirecting' map. If true, the iterator
2661: will return all information, starting with the top-level map,
2662: regardless of content. returnTopMap, if true (default false), will
2663: cause the iterator to return the top-level map object (resource 0.0)
2664: before anything else.
2665:
2666: Thus, by default, only top-level resources will be shown. Change the
2667: condition to a 1 without changing the hash, and all resources will be
2668: shown. Changing the condition to 1 and including some values in the
2669: hash will allow you to selectively suppress parts of the navmap, while
2670: leaving it on 0 and adding things to the hash will allow you to
2671: selectively add parts of the nav map. See the handler code for
2672: examples.
2673:
2674: The iterator will return either a reference to a resource object, or a
2675: token representing something in the map, such as the beginning of a
2676: new branch. The possible tokens are:
2677:
2678: =over 4
2679:
2680: =item * B<END_ITERATOR>:
2681:
2682: The iterator has returned all that it's going to. Further calls to the
2683: iterator will just produce more of these. This is a "false" value, and
2684: is the only false value the iterator which will be returned, so it can
2685: be used as a loop sentinel.
2686:
2687: =item * B<BEGIN_MAP>:
2688:
2689: A new map is being recursed into. This is returned I<after> the map
2690: resource itself is returned.
2691:
2692: =item * B<END_MAP>:
2693:
2694: The map is now done.
2695:
2696: =item * B<BEGIN_BRANCH>:
2697:
2698: A branch is now starting. The next resource returned will be the first
2699: in that branch.
2700:
2701: =item * B<END_BRANCH>:
2702:
2703: The branch is now done.
2704:
2705: =back
2706:
2707: The tokens are retreivable via methods on the iterator object, i.e.,
2708: $iterator->END_MAP.
2709:
2710: Maps can contain empty resources. The iterator will automatically skip
2711: over such resources, but will still treat the structure
2712: correctly. Thus, a complicated map with several branches, but
2713: consisting entirely of empty resources except for one beginning or
2714: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2715: but only one resource will be returned.
2716:
2717: =back
2718:
2719: =head2 Normal Usage
2720:
2721: Normal usage of the iterator object is to do the following:
2722:
2723: my $it = $navmap->getIterator([your params here]);
2724: my $curRes;
2725: while ($curRes = $it->next()) {
2726: [your logic here]
2727: }
2728:
2729: Note that inside of the loop, it's frequently useful to check if
2730: "$curRes" is a reference or not with the reference function; only
2731: resource objects will be references, and any non-references will
2732: be the tokens described above.
2733:
2734: Also note there is some old code floating around that trys to track
2735: the depth of the iterator to see when it's done; do not copy that
2736: code. It is difficult to get right and harder to understand then
2737: this. They should be migrated to this new style.
2738:
2739: =cut
2740:
2741: # Here are the tokens for the iterator:
2742:
2743: sub END_ITERATOR { return 0; }
2744: sub BEGIN_MAP { return 1; } # begining of a new map
2745: sub END_MAP { return 2; } # end of the map
2746: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2747: sub END_BRANCH { return 4; } # end of a branch
2748: sub FORWARD { return 1; } # go forward
2749: sub BACKWARD { return 2; }
2750:
2751: sub min {
2752: (my $a, my $b) = @_;
2753: if ($a < $b) { return $a; } else { return $b; }
2754: }
2755:
2756: sub new {
2757: # magic invocation to create a class instance
2758: my $proto = shift;
2759: my $class = ref($proto) || $proto;
2760: my $self = {};
2761:
2762: weaken($self->{NAV_MAP} = shift);
2763: return undef unless ($self->{NAV_MAP});
2764:
2765: # Handle the parameters
2766: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2767: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2768:
2769: # If the given resources are just the ID of the resource, get the
2770: # objects
2771: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2772: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2773: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2774: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2775:
2776: $self->{FILTER} = shift;
2777:
2778: # A hash, used as a set, of resource already seen
2779: $self->{ALREADY_SEEN} = shift;
2780: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2781: $self->{CONDITION} = shift;
2782:
2783: # Do we want to automatically follow "redirection" maps?
2784: $self->{FORCE_TOP} = shift;
2785:
2786: # Do we want to return the top-level map object (resource 0.0)?
2787: $self->{RETURN_0} = shift;
2788: # have we done that yet?
2789: $self->{HAVE_RETURNED_0} = 0;
2790:
2791: # Now, we need to pre-process the map, by walking forward and backward
2792: # over the parts of the map we're going to look at.
2793:
2794: # The processing steps are exactly the same, except for a few small
2795: # changes, so I bundle those up in the following list of two elements:
2796: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2797: # first_resource).
2798: # This prevents writing nearly-identical code twice.
2799: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2800: 'FIRST_RESOURCE'],
2801: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2802: 'FINISH_RESOURCE'] );
2803:
2804: my $maxDepth = 0; # tracks max depth
2805:
2806: # If there is only one resource in this map, and it's a map, we
2807: # want to remember that, so the user can ask for the first map
2808: # that isn't just a redirector.
2809: my $resource; my $resourceCount = 0;
2810:
2811: # Documentation on this algorithm can be found in the CVS repository at
2812: # /docs/lonnavdocs; these "**#**" markers correspond to documentation
2813: # in that file.
2814: # **1**
2815:
2816: foreach my $pass (@iterations) {
2817: my $direction = $pass->[0];
2818: my $valName = $pass->[1];
2819: my $nextResourceMethod = $pass->[2];
2820: my $firstResourceName = $pass->[3];
2821:
2822: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2823: $self->{FIRST_RESOURCE},
2824: $self->{FINISH_RESOURCE},
2825: {}, undef, 0, $direction);
2826:
2827: # prime the recursion
2828: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2829: $iterator->next();
2830: my $curRes = $iterator->next();
2831: my $depth = 1;
2832: while ($depth > 0) {
2833: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2834: if ($curRes == $iterator->END_MAP()) { $depth--; }
2835:
2836: if (ref($curRes)) {
2837: # If there's only one resource, this will save it
2838: # we have to filter empty resources from consideration here,
2839: # or even "empty", redirecting maps have two (start & finish)
2840: # or three (start, finish, plus redirector)
2841: if($direction == FORWARD && $curRes->src()) {
2842: $resource = $curRes; $resourceCount++;
2843: }
2844: my $resultingVal = $curRes->{DATA}->{$valName};
2845: my $nextResources = $curRes->$nextResourceMethod();
2846: my $nextCount = scalar(@{$nextResources});
2847:
2848: if ($nextCount == 1) { # **3**
2849: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2850: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2851: }
2852:
2853: if ($nextCount > 1) { # **4**
2854: foreach my $res (@{$nextResources}) {
2855: my $current = $res->{DATA}->{$valName} || 999999999;
2856: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2857: }
2858: }
2859: }
2860:
2861: # Assign the final val (**2**)
2862: if (ref($curRes) && $direction == BACKWARD()) {
2863: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2864: $curRes->{DATA}->{BOT_UP_VAL});
2865:
2866: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2867: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2868: }
2869:
2870: $curRes = $iterator->next();
2871: }
2872: }
2873:
2874: # Check: Was this only one resource, a map?
2875: if ($resourceCount == 1 && $resource->is_sequence() && !$self->{FORCE_TOP}) {
2876: my $firstResource = $resource->map_start();
2877: my $finishResource = $resource->map_finish();
2878: return
2879: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2880: $finishResource, $self->{FILTER},
2881: $self->{ALREADY_SEEN},
2882: $self->{CONDITION}, 0);
2883:
2884: }
2885:
2886: # Set up some bookkeeping information.
2887: $self->{CURRENT_DEPTH} = 0;
2888: $self->{MAX_DEPTH} = $maxDepth;
2889: $self->{STACK} = [];
2890: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2891: $self->{FINISHED} = 0; # When true, the iterator has finished
2892:
2893: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2894: push @{$self->{STACK}}, [];
2895: }
2896:
2897: # Prime the recursion w/ the first resource **5**
2898: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2899: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2900:
2901: bless ($self);
2902:
2903: return $self;
2904: }
2905:
2906: sub next {
2907: my $self = shift;
2908: my $closeAllPages=shift;
2909: if ($self->{FINISHED}) {
2910: return END_ITERATOR();
2911: }
2912:
2913: # If we want to return the top-level map object, and haven't yet,
2914: # do so.
2915: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2916: $self->{HAVE_RETURNED_0} = 1;
2917: return $self->{NAV_MAP}->getById('0.0');
2918: }
2919:
2920: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2921: # grab the next from the recursive iterator
2922: my $next = $self->{RECURSIVE_ITERATOR}->next($closeAllPages);
2923:
2924: # is it a begin or end map? If so, update the depth
2925: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2926: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2927:
2928: # Are we back at depth 0? If so, stop recursing
2929: if ($self->{RECURSIVE_DEPTH} == 0) {
2930: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2931: }
2932:
2933: return $next;
2934: }
2935:
2936: if (defined($self->{FORCE_NEXT})) {
2937: my $tmp = $self->{FORCE_NEXT};
2938: $self->{FORCE_NEXT} = undef;
2939: return $tmp;
2940: }
2941:
2942: # Have we not yet begun? If not, return BEGIN_MAP and
2943: # remember we've started.
2944: if ( !$self->{STARTED} ) {
2945: $self->{STARTED} = 1;
2946: return $self->BEGIN_MAP();
2947: }
2948:
2949: # Here's the guts of the iterator.
2950:
2951: # Find the next resource, if any.
2952: my $found = 0;
2953: my $i = $self->{MAX_DEPTH};
2954: my $newDepth;
2955: my $here;
2956: while ( $i >= 0 && !$found ) {
2957: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2958: $here = pop @{$self->{STACK}->[$i]}; # **7**
2959: $found = 1;
2960: $newDepth = $i;
2961: }
2962: $i--;
2963: }
2964:
2965: # If we still didn't find anything, we're done.
2966: if ( !$found ) {
2967: # We need to get back down to the correct branch depth
2968: if ( $self->{CURRENT_DEPTH} > 0 ) {
2969: $self->{CURRENT_DEPTH}--;
2970: return END_BRANCH();
2971: } else {
2972: $self->{FINISHED} = 1;
2973: return END_MAP();
2974: }
2975: }
2976:
2977: # If this is not a resource, it must be an END_BRANCH marker we want
2978: # to return directly.
2979: if (!ref($here)) { # **8**
2980: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2981: $self->{CURRENT_DEPTH}--;
2982: return $here;
2983: }
2984: }
2985:
2986: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2987: $self->{HERE} = $here;
2988:
2989: # Get to the right level
2990: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2991: push @{$self->{STACK}->[$newDepth]}, $here;
2992: $self->{CURRENT_DEPTH}--;
2993: return END_BRANCH();
2994: }
2995: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2996: push @{$self->{STACK}->[$newDepth]}, $here;
2997: $self->{CURRENT_DEPTH}++;
2998: return BEGIN_BRANCH();
2999: }
3000:
3001: # If we made it here, we have the next resource, and we're at the
3002: # right branch level. So let's examine the resource for where
3003: # we can get to from here.
3004:
3005: # So we need to look at all the resources we can get to from here,
3006: # categorize them if we haven't seen them, remember if we have a new
3007: my $nextUnfiltered = $here->getNext();
3008: my $maxDepthAdded = -1;
3009:
3010: for (@$nextUnfiltered) {
3011: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3012: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
3013: push @{$self->{STACK}->[$depth]}, $_;
3014: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
3015: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
3016: }
3017: }
3018:
3019: # Is this the end of a branch? If so, all of the resources examined above
3020: # led to lower levels then the one we are currently at, so we push a END_BRANCH
3021: # marker onto the stack so we don't forget.
3022: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
3023: # BC branch and gets to C, it will see F as the only next resource, but it's
3024: # one level lower. Thus, this is the end of the branch, since there are no
3025: # more resources added to this level or above.
3026: # We don't do this if the examined resource is the finish resource,
3027: # because the condition given above is true, but the "END_MAP" will
3028: # take care of things and we should already be at depth 0.
3029: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
3030: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
3031: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
3032: }
3033:
3034: # That ends the main iterator logic. Now, do we want to recurse
3035: # down this map (if this resource is a map)?
3036: if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
3037: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3038: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3039: my $firstResource = $self->{HERE}->map_start();
3040: my $finishResource = $self->{HERE}->map_finish();
3041:
3042: $self->{RECURSIVE_ITERATOR} =
3043: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
3044: $finishResource, $self->{FILTER},
3045: $self->{ALREADY_SEEN}, $self->{CONDITION});
3046: }
3047:
3048: # If this is a blank resource, don't actually return it.
3049: # Should you ever find you need it, make sure to add an option to the code
3050: # that you can use; other things depend on this behavior.
3051: my $browsePriv = $self->{HERE}->browsePriv();
3052: if (!$self->{HERE}->src() ||
3053: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
3054: return $self->next($closeAllPages);
3055: }
3056:
3057: return $self->{HERE};
3058:
3059: }
3060:
3061: =pod
3062:
3063: The other method available on the iterator is B<getStack>, which
3064: returns an array populated with the current 'stack' of maps, as
3065: references to the resource objects. Example: This is useful when
3066: making the navigation map, as we need to check whether we are under a
3067: page map to see if we need to link directly to the resource, or to the
3068: page. The first elements in the array will correspond to the top of
3069: the stack (most inclusive map).
3070:
3071: =cut
3072:
3073: sub getStack {
3074: my $self=shift;
3075:
3076: my @stack;
3077:
3078: $self->populateStack(\@stack);
3079:
3080: return \@stack;
3081: }
3082:
3083: # Private method: Calls the iterators recursively to populate the stack.
3084: sub populateStack {
3085: my $self=shift;
3086: my $stack = shift;
3087:
3088: push @$stack, $self->{HERE} if ($self->{HERE});
3089:
3090: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3091: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3092: }
3093: }
3094:
3095: 1;
3096:
3097: package Apache::lonnavmaps::DFSiterator;
3098: use WeakRef;
3099: # Not documented in the perldoc: This is a simple iterator that just walks
3100: # through the nav map and presents the resources in a depth-first search
3101: # fashion, ignorant of conditionals, randomized resources, etc. It presents
3102: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
3103: # useful for pre-processing of some kind, and is in fact used by the main
3104: # iterator that way, but that's about it.
3105: # One could imagine merging this into the init routine of the main iterator,
3106: # but this might as well be left separate, since it is possible some other
3107: # use might be found for it. - Jeremy
3108:
3109: # Unlike the main iterator, this DOES return all resources, even blank ones.
3110: # The main iterator needs them to correctly preprocess the map.
3111:
3112: sub BEGIN_MAP { return 1; } # begining of a new map
3113: sub END_MAP { return 2; } # end of the map
3114: sub FORWARD { return 1; } # go forward
3115: sub BACKWARD { return 2; }
3116:
3117: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
3118: # filter hash ref (or undef), already seen hash or undef, condition
3119: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
3120: sub new {
3121: # magic invocation to create a class instance
3122: my $proto = shift;
3123: my $class = ref($proto) || $proto;
3124: my $self = {};
3125:
3126: weaken($self->{NAV_MAP} = shift);
3127: return undef unless ($self->{NAV_MAP});
3128:
3129: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
3130: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
3131:
3132: # If the given resources are just the ID of the resource, get the
3133: # objects
3134: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
3135: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
3136: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
3137: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
3138:
3139: $self->{FILTER} = shift;
3140:
3141: # A hash, used as a set, of resource already seen
3142: $self->{ALREADY_SEEN} = shift;
3143: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
3144: $self->{CONDITION} = shift;
3145: $self->{DIRECTION} = shift || FORWARD();
3146:
3147: # Flag: Have we started yet?
3148: $self->{STARTED} = 0;
3149:
3150: # Should we continue calling the recursive iterator, if any?
3151: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3152: # The recursive iterator, if any
3153: $self->{RECURSIVE_ITERATOR} = undef;
3154: # Are we recursing on a map, or a branch?
3155: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
3156: # And the count of how deep it is, so that this iterator can keep track of
3157: # when to pick back up again.
3158: $self->{RECURSIVE_DEPTH} = 0;
3159:
3160: # For keeping track of our branches, we maintain our own stack
3161: $self->{STACK} = [];
3162:
3163: # Start with the first resource
3164: if ($self->{DIRECTION} == FORWARD) {
3165: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
3166: } else {
3167: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
3168: }
3169:
3170: bless($self);
3171: return $self;
3172: }
3173:
3174: sub next {
3175: my $self = shift;
3176:
3177: # Are we using a recursive iterator? If so, pull from that and
3178: # watch the depth; we want to resume our level at the correct time.
3179: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3180: # grab the next from the recursive iterator
3181: my $next = $self->{RECURSIVE_ITERATOR}->next();
3182:
3183: # is it a begin or end map? Update depth if so
3184: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
3185: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
3186:
3187: # Are we back at depth 0? If so, stop recursing.
3188: if ($self->{RECURSIVE_DEPTH} == 0) {
3189: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
3190: }
3191:
3192: return $next;
3193: }
3194:
3195: # Is there a current resource to grab? If not, then return
3196: # END_MAP, which will end the iterator.
3197: if (scalar(@{$self->{STACK}}) == 0) {
3198: return $self->END_MAP();
3199: }
3200:
3201: # Have we not yet begun? If not, return BEGIN_MAP and
3202: # remember that we've started.
3203: if ( !$self->{STARTED} ) {
3204: $self->{STARTED} = 1;
3205: return $self->BEGIN_MAP;
3206: }
3207:
3208: # Get the next resource in the branch
3209: $self->{HERE} = pop @{$self->{STACK}};
3210:
3211: # remember that we've seen this, so we don't return it again later
3212: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
3213:
3214: # Get the next possible resources
3215: my $nextUnfiltered;
3216: if ($self->{DIRECTION} == FORWARD()) {
3217: $nextUnfiltered = $self->{HERE}->getNext();
3218: } else {
3219: $nextUnfiltered = $self->{HERE}->getPrevious();
3220: }
3221: my $next = [];
3222:
3223: # filter the next possibilities to remove things we've
3224: # already seen.
3225: foreach (@$nextUnfiltered) {
3226: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
3227: push @$next, $_;
3228: }
3229: }
3230:
3231: while (@$next) {
3232: # copy the next possibilities over to the stack
3233: push @{$self->{STACK}}, shift @$next;
3234: }
3235:
3236: # If this is a map and we want to recurse down it... (not filtered out)
3237: if ($self->{HERE}->is_map() &&
3238: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
3239: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
3240: my $firstResource = $self->{HERE}->map_start();
3241: my $finishResource = $self->{HERE}->map_finish();
3242:
3243: $self->{RECURSIVE_ITERATOR} =
3244: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
3245: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
3246: $self->{CONDITION}, $self->{DIRECTION});
3247: }
3248:
3249: return $self->{HERE};
3250: }
3251:
3252: # Identical to the full iterator methods of the same name. Hate to copy/paste
3253: # but I also hate to "inherit" either iterator from the other.
3254:
3255: sub getStack {
3256: my $self=shift;
3257:
3258: my @stack;
3259:
3260: $self->populateStack(\@stack);
3261:
3262: return \@stack;
3263: }
3264:
3265: # Private method: Calls the iterators recursively to populate the stack.
3266: sub populateStack {
3267: my $self=shift;
3268: my $stack = shift;
3269:
3270: push @$stack, $self->{HERE} if ($self->{HERE});
3271:
3272: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
3273: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
3274: }
3275: }
3276:
3277: 1;
3278:
3279: package Apache::lonnavmaps::resource;
3280: use WeakRef;
3281: use Apache::lonnet;
3282:
3283: =pod
3284:
3285: =head1 Object: resource
3286:
3287: X<resource, navmap object>
3288: A resource object encapsulates a resource in a resource map, allowing
3289: easy manipulation of the resource, querying the properties of the
3290: resource (including user properties), and represents a reference that
3291: can be used as the canonical representation of the resource by
3292: lonnavmap clients like renderers.
3293:
3294: A resource only makes sense in the context of a navmap, as some of the
3295: data is stored in the navmap object.
3296:
3297: You will probably never need to instantiate this object directly. Use
3298: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
3299: starting resource.
3300:
3301: Resource objects respect the parameter_hiddenparts, which suppresses
3302: various parts according to the wishes of the map author. As of this
3303: writing, there is no way to override this parameter, and suppressed
3304: parts will never be returned, nor will their response types or ids be
3305: stored.
3306:
3307: =head2 Overview
3308:
3309: A B<Resource> is the most granular type of object in LON-CAPA that can
3310: be included in a course. It can either be a particular resource, like
3311: an HTML page, external resource, problem, etc., or it can be a
3312: container sequence, such as a "page" or a "map".
3313:
3314: To see a sequence from the user's point of view, please see the
3315: B<Creating a Course: Maps and Sequences> chapter of the Author's
3316: Manual.
3317:
3318: A Resource Object, once obtained from a navmap object via a B<getBy*>
3319: method of the navmap, or from an iterator, allows you to query
3320: information about that resource.
3321:
3322: Generally, you do not ever want to create a resource object yourself,
3323: so creation has been left undocumented. Always retrieve resources
3324: from navmap objects.
3325:
3326: =head3 Identifying Resources
3327:
3328: X<big hash>Every resource is identified by a Resource ID in the big hash that is
3329: unique to that resource for a given course. X<resource ID, in big hash>
3330: The Resource ID has the form #.#, where the first number is the same
3331: for every resource in a map, and the second is unique. For instance,
3332: for a course laid out like this:
3333:
3334: * Problem 1
3335: * Map
3336: * Resource 2
3337: * Resource 3
3338:
3339: C<Problem 1> and C<Map> will share a first number, and C<Resource 2>
3340: C<Resource 3> will share a first number. The second number may end up
3341: re-used between the two groups.
3342:
3343: The resource ID is only used in the big hash, but can be used in the
3344: context of a course to identify a resource easily. (For instance, the
3345: printing system uses it to record which resources from a sequence you
3346: wish to print.)
3347:
3348: X<symb> X<resource, symb>
3349: All resources also have B<symb>s, which uniquely identify a resource
3350: in a course. Many internal LON-CAPA functions expect a symb. A symb
3351: carries along with it the URL of the resource, and the map it appears
3352: in. Symbs are much larger then resource IDs.
3353:
3354: =cut
3355:
3356: sub new {
3357: # magic invocation to create a class instance
3358: my $proto = shift;
3359: my $class = ref($proto) || $proto;
3360: my $self = {};
3361:
3362: weaken($self->{NAV_MAP} = shift);
3363: $self->{ID} = shift;
3364:
3365: # Store this new resource in the parent nav map's cache.
3366: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
3367: $self->{RESOURCE_ERROR} = 0;
3368:
3369: # A hash that can be used by two-pass algorithms to store data
3370: # about this resource in. Not used by the resource object
3371: # directly.
3372: $self->{DATA} = {};
3373:
3374: bless($self);
3375:
3376: return $self;
3377: }
3378:
3379: # private function: simplify the NAV_HASH lookups we keep doing
3380: # pass the name, and to automatically append my ID, pass a true val on the
3381: # second param
3382: sub navHash {
3383: my $self = shift;
3384: my $param = shift;
3385: my $id = shift;
3386: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
3387: }
3388:
3389: =pod
3390:
3391: =head2 Methods
3392:
3393: Once you have a resource object, here's what you can do with it:
3394:
3395: =head3 Attribute Retrieval
3396:
3397: Every resource has certain attributes that can be retrieved and used:
3398:
3399: =over 4
3400:
3401: =item * B<ID>: Every resource has an ID that is unique for that
3402: resource in the course it is in. The ID is actually in the hash
3403: representing the resource, so for a resource object $res, obtain
3404: it via C<$res->{ID}).
3405:
3406: =item * B<compTitle>:
3407:
3408: Returns a "composite title", that is equal to $res->title() if the
3409: resource has a title, and is otherwise the last part of the URL (e.g.,
3410: "problem.problem").
3411:
3412: =item * B<ext>:
3413:
3414: Returns true if the resource is external.
3415:
3416: =item * B<kind>:
3417:
3418: Returns the kind of the resource from the compiled nav map.
3419:
3420: =item * B<randomout>:
3421:
3422: Returns true if this resource was chosen to NOT be shown to the user
3423: by the random map selection feature. In other words, this is usually
3424: false.
3425:
3426: =item * B<randompick>:
3427:
3428: Returns true for a map if the randompick feature is being used on the
3429: map. (?)
3430:
3431: =item * B<src>:
3432:
3433: Returns the source for the resource.
3434:
3435: =item * B<symb>:
3436:
3437: Returns the symb for the resource.
3438:
3439: =item * B<title>:
3440:
3441: Returns the title of the resource.
3442:
3443: =back
3444:
3445: =cut
3446:
3447: # These info functions can be used directly, as they don't return
3448: # resource information.
3449: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
3450: sub encrypted { my $self=shift; return $self->navHash("encrypted_", 1); }
3451: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
3452: sub from { my $self=shift; return $self->navHash("from_", 1); }
3453: # considered private and undocumented
3454: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
3455: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
3456: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
3457: sub randompick {
3458: my $self = shift;
3459: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
3460: '.0.parameter_randompick'};
3461: }
3462: sub link {
3463: my $self=shift;
3464: if ($self->encrypted()) { return &Apache::lonenc::encrypted($self->src); }
3465: return $self->src;
3466: }
3467: sub src {
3468: my $self=shift;
3469: return $self->navHash("src_", 1);
3470: }
3471: sub shown_symb {
3472: my $self=shift;
3473: if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
3474: return $self->symb();
3475: }
3476: sub symb {
3477: my $self=shift;
3478: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
3479: my $symbSrc = &Apache::lonnet::declutter($self->src());
3480: my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first))
3481: . '___' . $second . '___' . $symbSrc;
3482: return &Apache::lonnet::symbclean($symb);
3483: }
3484: sub title {
3485: my $self=shift;
3486: if ($self->{ID} eq '0.0') {
3487: # If this is the top-level map, return the title of the course
3488: # since this map can not be titled otherwise.
3489: return $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
3490: }
3491: return $self->navHash("title_", 1); }
3492: # considered private and undocumented
3493: sub to { my $self=shift; return $self->navHash("to_", 1); }
3494: sub condition {
3495: my $self=shift;
3496: my $undercond=$self->navHash("undercond_", 1);
3497: if (!defined($undercond)) { return 1; };
3498: my $condid=$self->navHash("condid_$undercond");
3499: if (!defined($condid)) { return 1; };
3500: my $condition=&Apache::lonnet::directcondval($condid);
3501: return $condition;
3502: }
3503:
3504: sub compTitle {
3505: my $self = shift;
3506: my $title = $self->title();
3507: $title=~s/\&colon\;/\:/gs;
3508: if (!$title) {
3509: $title = $self->src();
3510: $title = substr($title, rindex($title, '/') + 1);
3511: }
3512: return $title;
3513: }
3514: =pod
3515:
3516: B<Predicate Testing the Resource>
3517:
3518: These methods are shortcuts to deciding if a given resource has a given property.
3519:
3520: =over 4
3521:
3522: =item * B<is_map>:
3523:
3524: Returns true if the resource is a map type.
3525:
3526: =item * B<is_problem>:
3527:
3528: Returns true if the resource is a problem type, false
3529: otherwise. (Looks at the extension on the src field; might need more
3530: to work correctly.)
3531:
3532: =item * B<is_page>:
3533:
3534: Returns true if the resource is a page.
3535:
3536: =item * B<is_sequence>:
3537:
3538: Returns true if the resource is a sequence.
3539:
3540: =back
3541:
3542: =cut
3543:
3544: sub hasResource {
3545: my $self = shift;
3546: return $self->{NAV_MAP}->hasResource(@_);
3547: }
3548:
3549: sub retrieveResources {
3550: my $self = shift;
3551: return $self->{NAV_MAP}->retrieveResources(@_);
3552: }
3553:
3554: sub is_html {
3555: my $self=shift;
3556: my $src = $self->src();
3557: return ($src =~ /html$/);
3558: }
3559: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
3560: sub is_page {
3561: my $self=shift;
3562: my $src = $self->src();
3563: return $self->navHash("is_map_", 1) &&
3564: $self->navHash("map_type_" . $self->map_pc()) eq 'page';
3565: }
3566: sub is_problem {
3567: my $self=shift;
3568: my $src = $self->src();
3569: return ($src =~ /\.(problem|exam|quiz|assess|survey|form|library)$/)
3570: }
3571: sub contains_problem {
3572: my $self=shift;
3573: if ($self->is_page()) {
3574: my $hasProblem=$self->hasResource($self,sub { $_[0]->is_problem() },1);
3575: return $hasProblem;
3576: }
3577: return 0;
3578: }
3579: sub is_sequence {
3580: my $self=shift;
3581: my $src = $self->src();
3582: return $self->navHash("is_map_", 1) &&
3583: $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
3584: }
3585: sub is_survey {
3586: my $self = shift();
3587: my $part = shift();
3588: if ($self->parmval('type',$part) eq 'survey') {
3589: return 1;
3590: }
3591: if ($self->src() =~ /\.(survey)$/) {
3592: return 1;
3593: }
3594: return 0;
3595: }
3596:
3597: sub is_empty_sequence {
3598: my $self=shift;
3599: my $src = $self->src();
3600: return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
3601: }
3602:
3603: # Private method: Shells out to the parmval in the nav map, handler parts.
3604: sub parmval {
3605: my $self = shift;
3606: my $what = shift;
3607: my $part = shift;
3608: if (!defined($part)) {
3609: $part = '0';
3610: }
3611: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
3612: }
3613:
3614: =pod
3615:
3616: B<Map Methods>
3617:
3618: These methods are useful for getting information about the map
3619: properties of the resource, if the resource is a map (B<is_map>).
3620:
3621: =over 4
3622:
3623: =item * B<map_finish>:
3624:
3625: Returns a reference to a resource object corresponding to the finish
3626: resource of the map.
3627:
3628: =item * B<map_pc>:
3629:
3630: Returns the pc value of the map, which is the first number that
3631: appears in the resource ID of the resources in the map, and is the
3632: number that appears around the middle of the symbs of the resources in
3633: that map.
3634:
3635: =item * B<map_start>:
3636:
3637: Returns a reference to a resource object corresponding to the start
3638: resource of the map.
3639:
3640: =item * B<map_type>:
3641:
3642: Returns a string with the type of the map in it.
3643:
3644: =back
3645:
3646: =cut
3647:
3648: sub map_finish {
3649: my $self = shift;
3650: my $src = $self->src();
3651: $src = Apache::lonnet::clutter($src);
3652: my $res = $self->navHash("map_finish_$src", 0);
3653: $res = $self->{NAV_MAP}->getById($res);
3654: return $res;
3655: }
3656: sub map_pc {
3657: my $self = shift;
3658: my $src = $self->src();
3659: return $self->navHash("map_pc_$src", 0);
3660: }
3661: sub map_start {
3662: my $self = shift;
3663: my $src = $self->src();
3664: $src = Apache::lonnet::clutter($src);
3665: my $res = $self->navHash("map_start_$src", 0);
3666: $res = $self->{NAV_MAP}->getById($res);
3667: return $res;
3668: }
3669: sub map_type {
3670: my $self = shift;
3671: my $pc = $self->map_pc();
3672: return $self->navHash("map_type_$pc", 0);
3673: }
3674:
3675: #####
3676: # Property queries
3677: #####
3678:
3679: # These functions will be responsible for returning the CORRECT
3680: # VALUE for the parameter, no matter what. So while they may look
3681: # like direct calls to parmval, they can be more then that.
3682: # So, for instance, the duedate function should use the "duedatetype"
3683: # information, rather then the resource object user.
3684:
3685: =pod
3686:
3687: =head2 Resource Parameters
3688:
3689: In order to use the resource parameters correctly, the nav map must
3690: have been instantiated with genCourseAndUserOptions set to true, so
3691: the courseopt and useropt is read correctly. Then, you can call these
3692: functions to get the relevant parameters for the resource. Each
3693: function defaults to part "0", but can be directed to another part by
3694: passing the part as the parameter.
3695:
3696: These methods are responsible for getting the parameter correct, not
3697: merely reflecting the contents of the GDBM hashes. As we move towards
3698: dates relative to other dates, these methods should be updated to
3699: reflect that. (Then, anybody using these methods will not have to update
3700: their code.)
3701:
3702: =over 4
3703:
3704: =item * B<acc>:
3705:
3706: Get the Client IP/Name Access Control information.
3707:
3708: =item * B<answerdate>:
3709:
3710: Get the answer-reveal date for the problem.
3711:
3712: =item * B<awarded>:
3713:
3714: Gets the awarded value for the problem part. Requires genUserData set to
3715: true when the navmap object was created.
3716:
3717: =item * B<duedate>:
3718:
3719: Get the due date for the problem.
3720:
3721: =item * B<tries>:
3722:
3723: Get the number of tries the student has used on the problem.
3724:
3725: =item * B<maxtries>:
3726:
3727: Get the number of max tries allowed.
3728:
3729: =item * B<opendate>:
3730:
3731: Get the open date for the problem.
3732:
3733: =item * B<sig>:
3734:
3735: Get the significant figures setting.
3736:
3737: =item * B<tol>:
3738:
3739: Get the tolerance for the problem.
3740:
3741: =item * B<tries>:
3742:
3743: Get the number of tries the user has already used on the problem.
3744:
3745: =item * B<type>:
3746:
3747: Get the question type for the problem.
3748:
3749: =item * B<weight>:
3750:
3751: Get the weight for the problem.
3752:
3753: =back
3754:
3755: =cut
3756:
3757: sub acc {
3758: (my $self, my $part) = @_;
3759: return $self->parmval("acc", $part);
3760: }
3761: sub answerdate {
3762: (my $self, my $part) = @_;
3763: # Handle intervals
3764: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3765: return $self->duedate($part) +
3766: $self->parmval("answerdate", $part);
3767: }
3768: return $self->parmval("answerdate", $part);
3769: }
3770: sub awarded {
3771: my $self = shift; my $part = shift;
3772: $self->{NAV_MAP}->get_user_data();
3773: if (!defined($part)) { $part = '0'; }
3774: return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
3775: }
3776: sub duedate {
3777: (my $self, my $part) = @_;
3778: my $interval=$self->parmval("interval", $part);
3779: if ($interval) {
3780: my $first_access=&Apache::lonnet::get_first_access('map',$self->symb);
3781: if ($first_access) { return ($first_access+$interval); }
3782: }
3783: return $self->parmval("duedate", $part);
3784: }
3785: sub maxtries {
3786: (my $self, my $part) = @_;
3787: return $self->parmval("maxtries", $part);
3788: }
3789: sub opendate {
3790: (my $self, my $part) = @_;
3791: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3792: return $self->duedate($part) -
3793: $self->parmval("opendate", $part);
3794: }
3795: return $self->parmval("opendate");
3796: }
3797: sub problemstatus {
3798: (my $self, my $part) = @_;
3799: return lc $self->parmval("problemstatus", $part);
3800: }
3801: sub sig {
3802: (my $self, my $part) = @_;
3803: return $self->parmval("sig", $part);
3804: }
3805: sub tol {
3806: (my $self, my $part) = @_;
3807: return $self->parmval("tol", $part);
3808: }
3809: sub tries {
3810: my $self = shift;
3811: my $tries = $self->queryRestoreHash('tries', shift);
3812: if (!defined($tries)) { return '0';}
3813: return $tries;
3814: }
3815: sub type {
3816: (my $self, my $part) = @_;
3817: return $self->parmval("type", $part);
3818: }
3819: sub weight {
3820: my $self = shift; my $part = shift;
3821: if (!defined($part)) { $part = '0'; }
3822: return &Apache::lonnet::EXT('resource.'.$part.'.weight',
3823: $self->symb(), $ENV{'user.domain'},
3824: $ENV{'user.name'},
3825: $ENV{'request.course.sec'});
3826: }
3827: sub part_display {
3828: my $self= shift(); my $partID = shift();
3829: if (! defined($partID)) { $partID = '0'; }
3830: my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
3831: $self->symb);
3832: if (! defined($display) || $display eq '') {
3833: $display = $partID;
3834: }
3835: return $display;
3836: }
3837:
3838: # Multiple things need this
3839: sub getReturnHash {
3840: my $self = shift;
3841:
3842: if (!defined($self->{RETURN_HASH})) {
3843: my %tmpHash = &Apache::lonnet::restore($self->symb());
3844: $self->{RETURN_HASH} = \%tmpHash;
3845: }
3846: }
3847:
3848: ######
3849: # Status queries
3850: ######
3851:
3852: # These methods query the status of problems.
3853:
3854: # If we need to count parts, this function determines the number of
3855: # parts from the metadata. When called, it returns a reference to a list
3856: # of strings corresponding to the parts. (Thus, using it in a scalar context
3857: # tells you how many parts you have in the problem:
3858: # $partcount = scalar($resource->countParts());
3859: # Don't use $self->{PARTS} directly because you don't know if it's been
3860: # computed yet.
3861:
3862: =pod
3863:
3864: =head2 Resource misc
3865:
3866: Misc. functions for the resource.
3867:
3868: =over 4
3869:
3870: =item * B<hasDiscussion>:
3871:
3872: Returns a false value if there has been discussion since the user last
3873: logged in, true if there has. Always returns false if the discussion
3874: data was not extracted when the nav map was constructed.
3875:
3876: =item * B<getFeedback>:
3877:
3878: Gets the feedback for the resource and returns the raw feedback string
3879: for the resource, or the null string if there is no feedback or the
3880: email data was not extracted when the nav map was constructed. Usually
3881: used like this:
3882:
3883: for (split(/\,/, $res->getFeedback())) {
3884: my $link = &Apache::lonnet::escape($_);
3885: ...
3886:
3887: and use the link as appropriate.
3888:
3889: =cut
3890:
3891: sub hasDiscussion {
3892: my $self = shift;
3893: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3894: }
3895:
3896: sub getFeedback {
3897: my $self = shift;
3898: my $source = $self->src();
3899: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3900: return $self->{NAV_MAP}->getFeedback($source);
3901: }
3902:
3903: sub getErrors {
3904: my $self = shift;
3905: my $source = $self->src();
3906: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3907: return $self->{NAV_MAP}->getErrors($source);
3908: }
3909:
3910: =pod
3911:
3912: =item * B<parts>():
3913:
3914: Returns a list reference containing sorted strings corresponding to
3915: each part of the problem. Single part problems have only a part '0'.
3916: Multipart problems do not return their part '0', since they typically
3917: do not really matter.
3918:
3919: =item * B<countParts>():
3920:
3921: Returns the number of parts of the problem a student can answer. Thus,
3922: for single part problems, returns 1. For multipart, it returns the
3923: number of parts in the problem, not including psuedo-part 0.
3924:
3925: =item * B<countResponses>():
3926:
3927: Returns the total number of responses in the problem a student can answer.
3928:
3929: =item * B<responseTypes>():
3930:
3931: Returns a hash whose keys are the response types. The values are the number
3932: of times each response type is used. This is for the I<entire> problem, not
3933: just a single part.
3934:
3935: =item * B<multipart>():
3936:
3937: Returns true if the problem is multipart, false otherwise. Use this instead
3938: of countParts if all you want is multipart/not multipart.
3939:
3940: =item * B<responseType>($part):
3941:
3942: Returns the response type of the part, without the word "response" on the
3943: end. Example return values: 'string', 'essay', 'numeric', etc.
3944:
3945: =item * B<responseIds>($part):
3946:
3947: Retreives the response IDs for the given part as an array reference containing
3948: strings naming the response IDs. This may be empty.
3949:
3950: =back
3951:
3952: =cut
3953:
3954: sub parts {
3955: my $self = shift;
3956:
3957: if ($self->ext) { return []; }
3958:
3959: $self->extractParts();
3960: return $self->{PARTS};
3961: }
3962:
3963: sub countParts {
3964: my $self = shift;
3965:
3966: my $parts = $self->parts();
3967:
3968: # If I left this here, then it's not necessary.
3969: #my $delta = 0;
3970: #for my $part (@$parts) {
3971: # if ($part eq '0') { $delta--; }
3972: #}
3973:
3974: if ($self->{RESOURCE_ERROR}) {
3975: return 0;
3976: }
3977:
3978: return scalar(@{$parts}); # + $delta;
3979: }
3980:
3981: sub countResponses {
3982: my $self = shift;
3983: my $count;
3984: foreach my $part (@{$self->parts()}) {
3985: $count+= scalar($self->responseIds($part));
3986: }
3987: return $count;
3988: }
3989:
3990: sub responseTypes {
3991: my $self = shift;
3992: my %responses;
3993: foreach my $part ($self->parts()) {
3994: foreach my $responsetype ($self->responseType($part)) {
3995: $responses{$responsetype}++ if (defined($responsetype));
3996: }
3997: }
3998: return %responses;
3999: }
4000:
4001: sub multipart {
4002: my $self = shift;
4003: return $self->countParts() > 1;
4004: }
4005:
4006: sub singlepart {
4007: my $self = shift;
4008: return $self->countParts() == 1;
4009: }
4010:
4011: sub responseType {
4012: my $self = shift;
4013: my $part = shift;
4014:
4015: $self->extractParts();
4016: if (defined($self->{RESPONSE_TYPES}->{$part})) {
4017: return @{$self->{RESPONSE_TYPES}->{$part}};
4018: } else {
4019: return undef;
4020: }
4021: }
4022:
4023: sub responseIds {
4024: my $self = shift;
4025: my $part = shift;
4026:
4027: $self->extractParts();
4028: if (defined($self->{RESPONSE_IDS}->{$part})) {
4029: return @{$self->{RESPONSE_IDS}->{$part}};
4030: } else {
4031: return undef;
4032: }
4033: }
4034:
4035: # Private function: Extracts the parts information, both part names and
4036: # part types, and saves it.
4037: sub extractParts {
4038: my $self = shift;
4039:
4040: return if (defined($self->{PARTS}));
4041: return if ($self->ext);
4042:
4043: $self->{PARTS} = [];
4044:
4045: my %parts;
4046:
4047: # Retrieve part count, if this is a problem
4048: if ($self->is_problem()) {
4049: my $partorder = &Apache::lonnet::metadata($self->src(), 'partorder');
4050: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
4051:
4052: if ($partorder) {
4053: my @parts;
4054: for my $part (split (/,/,$partorder)) {
4055: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4056: push @parts, $part;
4057: $parts{$part} = 1;
4058: }
4059: }
4060: $self->{PARTS} = \@parts;
4061: } else {
4062: if (!$metadata) {
4063: $self->{RESOURCE_ERROR} = 1;
4064: $self->{PARTS} = [];
4065: $self->{PART_TYPE} = {};
4066: return;
4067: }
4068: foreach (split(/\,/,$metadata)) {
4069: if ($_ =~ /^part_(.*)$/) {
4070: my $part = $1;
4071: # This floods the logs if it blows up
4072: if (defined($parts{$part})) {
4073: &Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
4074: }
4075:
4076: # check to see if part is turned off.
4077:
4078: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
4079: $parts{$part} = 1;
4080: }
4081: }
4082: }
4083: my @sortedParts = sort keys %parts;
4084: $self->{PARTS} = \@sortedParts;
4085: }
4086:
4087:
4088: # These hashes probably do not need names that end with "Hash"....
4089: my %responseIdHash;
4090: my %responseTypeHash;
4091:
4092:
4093: # Init the responseIdHash
4094: foreach (@{$self->{PARTS}}) {
4095: $responseIdHash{$_} = [];
4096: }
4097:
4098: # Now, the unfortunate thing about this is that parts, part name, and
4099: # response id are delimited by underscores, but both the part
4100: # name and response id can themselves have underscores in them.
4101: # So we have to use our knowlege of part names to figure out
4102: # where the part names begin and end, and even then, it is possible
4103: # to construct ambiguous situations.
4104: foreach (split /,/, $metadata) {
4105: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
4106: my $responseType = $1;
4107: my $partStuff = $2;
4108: my $partIdSoFar = '';
4109: my @partChunks = split /_/, $partStuff;
4110: my $i = 0;
4111: for ($i = 0; $i < scalar(@partChunks); $i++) {
4112: if ($partIdSoFar) { $partIdSoFar .= '_'; }
4113: $partIdSoFar .= $partChunks[$i];
4114: if ($parts{$partIdSoFar}) {
4115: my @otherChunks = @partChunks[$i+1..$#partChunks];
4116: my $responseId = join('_', @otherChunks);
4117: push @{$responseIdHash{$partIdSoFar}}, $responseId;
4118: push @{$responseTypeHash{$partIdSoFar}}, $responseType;
4119: }
4120: }
4121: }
4122: }
4123: my $resorder = &Apache::lonnet::metadata($self->src(),'responseorder');
4124: #
4125: # Reorder the arrays in the %responseIdHash and %responseTypeHash
4126: if ($resorder) {
4127: my @resorder=split(/,/,$resorder);
4128: foreach my $part (keys(%responseIdHash)) {
4129: my $i=0;
4130: my %resids = map { ($_,$i++) } @{ $responseIdHash{$part} };
4131: my @neworder;
4132: foreach my $possibleid (@resorder) {
4133: if (exists($resids{$possibleid})) {
4134: push(@neworder,$resids{$possibleid});
4135: }
4136: }
4137: my @ids;
4138: my @type;
4139: foreach my $element (@neworder) {
4140: push (@ids,$responseIdHash{$part}->[$element]);
4141: push (@type,$responseTypeHash{$part}->[$element]);
4142: }
4143: $responseIdHash{$part}=\@ids;
4144: $responseTypeHash{$part}=\@type;
4145: }
4146: }
4147: $self->{RESPONSE_IDS} = \%responseIdHash;
4148: $self->{RESPONSE_TYPES} = \%responseTypeHash;
4149: }
4150:
4151: return;
4152: }
4153:
4154: =pod
4155:
4156: =head2 Resource Status
4157:
4158: Problem resources have status information, reflecting their various
4159: dates and completion statuses.
4160:
4161: There are two aspects to the status: the date-related information and
4162: the completion information.
4163:
4164: Idiomatic usage of these two methods would probably look something
4165: like
4166:
4167: foreach ($resource->parts()) {
4168: my $dateStatus = $resource->getDateStatus($_);
4169: my $completionStatus = $resource->getCompletionStatus($_);
4170:
4171: or
4172:
4173: my $status = $resource->status($_);
4174:
4175: ... use it here ...
4176: }
4177:
4178: Which you use depends on exactly what you are looking for. The
4179: status() function has been optimized for the nav maps display and may
4180: not precisely match what you need elsewhere.
4181:
4182: The symbolic constants shown below can be accessed through the
4183: resource object: C<$res->OPEN>.
4184:
4185: =over 4
4186:
4187: =item * B<getDateStatus>($part):
4188:
4189: ($part defaults to 0). A convenience function that returns a symbolic
4190: constant telling you about the date status of the part. The possible
4191: return values are:
4192:
4193: =back
4194:
4195: B<Date Codes>
4196:
4197: =over 4
4198:
4199: =item * B<OPEN_LATER>:
4200:
4201: The problem will be opened later.
4202:
4203: =item * B<OPEN>:
4204:
4205: Open and not yet due.
4206:
4207:
4208: =item * B<PAST_DUE_ANSWER_LATER>:
4209:
4210: The due date has passed, but the answer date has not yet arrived.
4211:
4212: =item * B<PAST_DUE_NO_ANSWER>:
4213:
4214: The due date has passed and there is no answer opening date set.
4215:
4216: =item * B<ANSWER_OPEN>:
4217:
4218: The answer date is here.
4219:
4220: =item * B<NETWORK_FAILURE>:
4221:
4222: The information is unknown due to network failure.
4223:
4224: =back
4225:
4226: =cut
4227:
4228: # Apparently the compiler optimizes these into constants automatically
4229: sub OPEN_LATER { return 0; }
4230: sub OPEN { return 1; }
4231: sub PAST_DUE_NO_ANSWER { return 2; }
4232: sub PAST_DUE_ANSWER_LATER { return 3; }
4233: sub ANSWER_OPEN { return 4; }
4234: sub NOTHING_SET { return 5; }
4235: sub NETWORK_FAILURE { return 100; }
4236:
4237: # getDateStatus gets the date status for a given problem part.
4238: # Because answer date, due date, and open date are fully independent
4239: # (i.e., it is perfectly possible to *only* have an answer date),
4240: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
4241: # (past, future, none given). This function handles this with a decision
4242: # tree. Read the comments to follow the decision tree.
4243:
4244: sub getDateStatus {
4245: my $self = shift;
4246: my $part = shift;
4247: $part = "0" if (!defined($part));
4248:
4249: # Always return network failure if there was one.
4250: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4251:
4252: my $now = time();
4253:
4254: my $open = $self->opendate($part);
4255: my $due = $self->duedate($part);
4256: my $answer = $self->answerdate($part);
4257:
4258: if (!$open && !$due && !$answer) {
4259: # no data on the problem at all
4260: # should this be the same as "open later"? think multipart.
4261: return $self->NOTHING_SET;
4262: }
4263: if (!$open || $now < $open) {return $self->OPEN_LATER}
4264: if (!$due || $now < $due) {return $self->OPEN}
4265: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
4266: if ($answer) { return $self->ANSWER_OPEN; }
4267: return PAST_DUE_NO_ANSWER;
4268: }
4269:
4270: =pod
4271:
4272: B<>
4273:
4274: =over 4
4275:
4276: =item * B<getCompletionStatus>($part):
4277:
4278: ($part defaults to 0.) A convenience function that returns a symbolic
4279: constant telling you about the completion status of the part, with the
4280: following possible results:
4281:
4282: =back
4283:
4284: B<Completion Codes>
4285:
4286: =over 4
4287:
4288: =item * B<NOT_ATTEMPTED>:
4289:
4290: Has not been attempted at all.
4291:
4292: =item * B<INCORRECT>:
4293:
4294: Attempted, but wrong by student.
4295:
4296: =item * B<INCORRECT_BY_OVERRIDE>:
4297:
4298: Attempted, but wrong by instructor override.
4299:
4300: =item * B<CORRECT>:
4301:
4302: Correct or correct by instructor.
4303:
4304: =item * B<CORRECT_BY_OVERRIDE>:
4305:
4306: Correct by instructor override.
4307:
4308: =item * B<EXCUSED>:
4309:
4310: Excused. Not yet implemented.
4311:
4312: =item * B<NETWORK_FAILURE>:
4313:
4314: Information not available due to network failure.
4315:
4316: =item * B<ATTEMPTED>:
4317:
4318: Attempted, and not yet graded.
4319:
4320: =back
4321:
4322: =cut
4323:
4324: sub NOT_ATTEMPTED { return 10; }
4325: sub INCORRECT { return 11; }
4326: sub INCORRECT_BY_OVERRIDE { return 12; }
4327: sub CORRECT { return 13; }
4328: sub CORRECT_BY_OVERRIDE { return 14; }
4329: sub EXCUSED { return 15; }
4330: sub ATTEMPTED { return 16; }
4331:
4332: sub getCompletionStatus {
4333: my $self = shift;
4334: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4335:
4336: my $status = $self->queryRestoreHash('solved', shift);
4337:
4338: # Left as separate if statements in case we ever do more with this
4339: if ($status eq 'correct_by_student') {return $self->CORRECT;}
4340: if ($status eq 'correct_by_scantron') {return $self->CORRECT;}
4341: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
4342: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
4343: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
4344: if ($status eq 'excused') {return $self->EXCUSED; }
4345: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
4346: return $self->NOT_ATTEMPTED;
4347: }
4348:
4349: sub queryRestoreHash {
4350: my $self = shift;
4351: my $hashentry = shift;
4352: my $part = shift;
4353: $part = "0" if (!defined($part) || $part eq '');
4354: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
4355:
4356: $self->getReturnHash();
4357:
4358: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
4359: }
4360:
4361: =pod
4362:
4363: B<Composite Status>
4364:
4365: Along with directly returning the date or completion status, the
4366: resource object includes a convenience function B<status>() that will
4367: combine the two status tidbits into one composite status that can
4368: represent the status of the resource as a whole. This method represents
4369: the concept of the thing we want to display to the user on the nav maps
4370: screen, which is a combination of completion and open status. The precise logic is
4371: documented in the comments of the status method. The following results
4372: may be returned, all available as methods on the resource object
4373: ($res->NETWORK_FAILURE): In addition to the return values that match
4374: the date or completion status, this function can return "ANSWER_SUBMITTED"
4375: if that problemstatus parameter value is set to No, suppressing the
4376: incorrect/correct feedback.
4377:
4378: =over 4
4379:
4380: =item * B<NETWORK_FAILURE>:
4381:
4382: The network has failed and the information is not available.
4383:
4384: =item * B<NOTHING_SET>:
4385:
4386: No dates have been set for this problem (part) at all. (Because only
4387: certain parts of a multi-part problem may be assigned, this can not be
4388: collapsed into "open later", as we do not know a given part will EVER
4389: be opened. For single part, this is the same as "OPEN_LATER".)
4390:
4391: =item * B<CORRECT>:
4392:
4393: For any reason at all, the part is considered correct.
4394:
4395: =item * B<EXCUSED>:
4396:
4397: For any reason at all, the problem is excused.
4398:
4399: =item * B<PAST_DUE_NO_ANSWER>:
4400:
4401: The problem is past due, not considered correct, and no answer date is
4402: set.
4403:
4404: =item * B<PAST_DUE_ANSWER_LATER>:
4405:
4406: The problem is past due, not considered correct, and an answer date in
4407: the future is set.
4408:
4409: =item * B<ANSWER_OPEN>:
4410:
4411: The problem is past due, not correct, and the answer is now available.
4412:
4413: =item * B<OPEN_LATER>:
4414:
4415: The problem is not yet open.
4416:
4417: =item * B<TRIES_LEFT>:
4418:
4419: The problem is open, has been tried, is not correct, but there are
4420: tries left.
4421:
4422: =item * B<INCORRECT>:
4423:
4424: The problem is open, and all tries have been used without getting the
4425: correct answer.
4426:
4427: =item * B<OPEN>:
4428:
4429: The item is open and not yet tried.
4430:
4431: =item * B<ATTEMPTED>:
4432:
4433: The problem has been attempted.
4434:
4435: =item * B<ANSWER_SUBMITTED>:
4436:
4437: An answer has been submitted, but the student should not see it.
4438:
4439: =back
4440:
4441: =cut
4442:
4443: sub TRIES_LEFT { return 20; }
4444: sub ANSWER_SUBMITTED { return 21; }
4445:
4446: sub status {
4447: my $self = shift;
4448: my $part = shift;
4449: if (!defined($part)) { $part = "0"; }
4450: my $completionStatus = $self->getCompletionStatus($part);
4451: my $dateStatus = $self->getDateStatus($part);
4452:
4453: # What we have is a two-dimensional matrix with 4 entries on one
4454: # dimension and 5 entries on the other, which we want to colorize,
4455: # plus network failure and "no date data at all".
4456:
4457: #if ($self->{RESOURCE_ERROR}) { return NETWORK_FAILURE; }
4458: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
4459:
4460: my $suppressFeedback = $self->problemstatus($part) eq 'no';
4461: # If there's an answer date and we're past it, don't
4462: # suppress the feedback; student should know
4463: if ($self->answerdate($part) && $self->answerdate($part) < time()) {
4464: $suppressFeedback = 0;
4465: }
4466:
4467: # There are a few whole rows we can dispose of:
4468: if ($completionStatus == CORRECT ||
4469: $completionStatus == CORRECT_BY_OVERRIDE ) {
4470: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
4471: }
4472:
4473: if ($completionStatus == ATTEMPTED) {
4474: return ATTEMPTED;
4475: }
4476:
4477: # If it's EXCUSED, then return that no matter what
4478: if ($completionStatus == EXCUSED) {
4479: return EXCUSED;
4480: }
4481:
4482: if ($dateStatus == NOTHING_SET) {
4483: return NOTHING_SET;
4484: }
4485:
4486: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
4487: # by 4 matrix (date statuses).
4488:
4489: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
4490: $dateStatus == PAST_DUE_NO_ANSWER ) {
4491: return $suppressFeedback ? ANSWER_SUBMITTED : $dateStatus;
4492: }
4493:
4494: if ($dateStatus == ANSWER_OPEN) {
4495: return ANSWER_OPEN;
4496: }
4497:
4498: # Now: (incorrect, incorrect_override, not_attempted) x
4499: # (open_later), (open)
4500:
4501: if ($dateStatus == OPEN_LATER) {
4502: return OPEN_LATER;
4503: }
4504:
4505: # If it's WRONG...
4506: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
4507: # and there are TRIES LEFT:
4508: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
4509: return $suppressFeedback ? ANSWER_SUBMITTED : TRIES_LEFT;
4510: }
4511: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
4512: }
4513:
4514: # Otherwise, it's untried and open
4515: return OPEN;
4516: }
4517:
4518: sub CLOSED { return 23; }
4519: sub ERROR { return 24; }
4520:
4521: =pod
4522:
4523: B<Simple Status>
4524:
4525: Convenience method B<simpleStatus> provides a "simple status" for the resource.
4526: "Simple status" corresponds to "which icon is shown on the
4527: Navmaps". There are six "simple" statuses:
4528:
4529: =over 4
4530:
4531: =item * B<CLOSED>: The problem is currently closed. (No icon shown.)
4532:
4533: =item * B<OPEN>: The problem is open and unattempted.
4534:
4535: =item * B<CORRECT>: The problem is correct for any reason.
4536:
4537: =item * B<INCORRECT>: The problem is incorrect and can still be
4538: completed successfully.
4539:
4540: =item * B<ATTEMPTED>: The problem has been attempted, but the student
4541: does not know if they are correct. (The ellipsis icon.)
4542:
4543: =item * B<ERROR>: There is an error retrieving information about this
4544: problem.
4545:
4546: =back
4547:
4548: =cut
4549:
4550: # This hash maps the composite status to this simple status, and
4551: # can be used directly, if you like
4552: my %compositeToSimple =
4553: (
4554: NETWORK_FAILURE() => ERROR,
4555: NOTHING_SET() => CLOSED,
4556: CORRECT() => CORRECT,
4557: EXCUSED() => CORRECT,
4558: PAST_DUE_NO_ANSWER() => INCORRECT,
4559: PAST_DUE_ANSWER_LATER() => INCORRECT,
4560: ANSWER_OPEN() => INCORRECT,
4561: OPEN_LATER() => CLOSED,
4562: TRIES_LEFT() => OPEN,
4563: INCORRECT() => INCORRECT,
4564: OPEN() => OPEN,
4565: ATTEMPTED() => ATTEMPTED,
4566: ANSWER_SUBMITTED() => ATTEMPTED
4567: );
4568:
4569: sub simpleStatus {
4570: my $self = shift;
4571: my $part = shift;
4572: my $status = $self->status($part);
4573: return $compositeToSimple{$status};
4574: }
4575:
4576: =pod
4577:
4578: B<simpleStatusCount> will return an array reference containing, in
4579: this order, the number of OPEN, CLOSED, CORRECT, INCORRECT, ATTEMPTED,
4580: and ERROR parts the given problem has.
4581:
4582: =cut
4583:
4584: # This maps the status to the slot we want to increment
4585: my %statusToSlotMap =
4586: (
4587: OPEN() => 0,
4588: CLOSED() => 1,
4589: CORRECT() => 2,
4590: INCORRECT() => 3,
4591: ATTEMPTED() => 4,
4592: ERROR() => 5
4593: );
4594:
4595: sub statusToSlot { return $statusToSlotMap{shift()}; }
4596:
4597: sub simpleStatusCount {
4598: my $self = shift;
4599:
4600: my @counts = (0, 0, 0, 0, 0, 0, 0);
4601: foreach my $part (@{$self->parts()}) {
4602: $counts[$statusToSlotMap{$self->simpleStatus($part)}]++;
4603: }
4604:
4605: return \@counts;
4606: }
4607:
4608: =pod
4609:
4610: B<Completable>
4611:
4612: The completable method represents the concept of I<whether the student can
4613: currently do the problem>. If the student can do the problem, which means
4614: that it is open, there are tries left, and if the problem is manually graded
4615: or the grade is suppressed via problemstatus, the student has not tried it
4616: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
4617: either the student has tried it and there is no feedback, or that for
4618: some reason it is no longer completable (not open yet, successfully completed,
4619: out of tries, etc.). As an example, this is used as the filter for the
4620: "Uncompleted Homework" option for the nav maps.
4621:
4622: If this does not quite meet your needs, do not fiddle with it (unless you are
4623: fixing it to better match the student's conception of "completable" because
4624: it's broken somehow)... make a new method.
4625:
4626: =cut
4627:
4628: sub completable {
4629: my $self = shift;
4630: if (!$self->is_problem()) { return 0; }
4631: my $partCount = $self->countParts();
4632:
4633: foreach my $part (@{$self->parts()}) {
4634: if ($part eq '0' && $partCount != 1) { next; }
4635: my $status = $self->status($part);
4636: # "If any of the parts are open, or have tries left (implies open),
4637: # and it is not "attempted" (manually graded problem), it is
4638: # not "complete"
4639: if ($self->getCompletionStatus($part) == ATTEMPTED() ||
4640: $status == ANSWER_SUBMITTED() ) {
4641: # did this part already, as well as we can
4642: next;
4643: }
4644: if ($status == OPEN() || $status == TRIES_LEFT()) {
4645: return 1;
4646: }
4647: }
4648:
4649: # If all the parts were complete, so was this problem.
4650: return 0;
4651: }
4652:
4653: =pod
4654:
4655: =head2 Resource/Nav Map Navigation
4656:
4657: =over 4
4658:
4659: =item * B<getNext>():
4660:
4661: Retreive an array of the possible next resources after this
4662: one. Always returns an array, even in the one- or zero-element case.
4663:
4664: =item * B<getPrevious>():
4665:
4666: Retreive an array of the possible previous resources from this
4667: one. Always returns an array, even in the one- or zero-element case.
4668:
4669: =cut
4670:
4671: sub getNext {
4672: my $self = shift;
4673: my @branches;
4674: my $to = $self->to();
4675: foreach my $branch ( split(/,/, $to) ) {
4676: my $choice = $self->{NAV_MAP}->getById($branch);
4677: if (!$choice->condition()) { next; }
4678: my $next = $choice->goesto();
4679: $next = $self->{NAV_MAP}->getById($next);
4680:
4681: push @branches, $next;
4682: }
4683: return \@branches;
4684: }
4685:
4686: sub getPrevious {
4687: my $self = shift;
4688: my @branches;
4689: my $from = $self->from();
4690: foreach my $branch ( split /,/, $from) {
4691: my $choice = $self->{NAV_MAP}->getById($branch);
4692: my $prev = $choice->comesfrom();
4693: $prev = $self->{NAV_MAP}->getById($prev);
4694:
4695: push @branches, $prev;
4696: }
4697: return \@branches;
4698: }
4699:
4700: sub browsePriv {
4701: my $self = shift;
4702: if (defined($self->{BROWSE_PRIV})) {
4703: return $self->{BROWSE_PRIV};
4704: }
4705:
4706: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
4707: }
4708:
4709: =pod
4710:
4711: =back
4712:
4713: =cut
4714:
4715: 1;
4716:
4717: __END__
4718:
4719:
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