Annotation of loncom/interface/lontrackstudent.pm, revision 1.16
1.1 matthew 1: # The LearningOnline Network with CAPA
2: #
1.16 ! albertel 3: # $Id: lontrackstudent.pm,v 1.15 2005/04/07 06:56:23 albertel Exp $
1.1 matthew 4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: ###
28:
29: =pod
30:
31: =head1 NAME
32:
33: lontrackstudent
34:
35: =head1 SYNOPSIS
36:
37: Track student progress through course materials
38:
39: =over 4
40:
41: =cut
42:
43: package Apache::lontrackstudent;
44:
45: use strict;
46: use Apache::Constants qw(:common :http);
1.13 matthew 47: use Apache::lonmysql;
1.15 albertel 48: use Apache::lonnet;
1.1 matthew 49: use Apache::lonlocal;
50: use Time::HiRes;
51:
1.16 ! albertel 52: my $num_records=500;
! 53:
1.5 matthew 54: sub get_data {
55: my ($r,$prog_state,$navmap,$mode) = @_;
1.2 matthew 56: ##
57: ## Compose the query
58: &Apache::lonhtmlcommon::Update_PrgWin
59: ($r,$prog_state,&mt('Composing Query'));
60: #
1.9 matthew 61: # Allow the other server to begin processing the data before we ask for it.
62: sleep(5);
1.10 matthew 63: #
64: my $max_time = &get_max_time_in_db($r,$prog_state);
65: if (defined($max_time)) {
66: $r->print('<h3>'.&mt('Activity data goes to [_1]',
67: &Apache::lonlocal::locallocaltime($max_time)).
68: '</h3>');
69: $r->rflush();
70: } else {
71: $r->print('<h3>'.&mt('Unable to retrieve any data. Please reload this page and try again.').'</h3>');
72: return;
73: }
74: my $query = &build_query($mode);
1.2 matthew 75: ##
76: ## Send it along
1.15 albertel 77: my $home = $env{'course.'.$env{'request.course.id'}.'.home'};
1.2 matthew 78: my $reply=&Apache::lonnet::metadata_query($query,undef,undef,[$home]);
79: if (ref($reply) ne 'HASH') {
80: $r->print('<h2>'.
81: &mt('Error contacting home server for course: [_1]',
82: $reply).
83: '</h2>');
84: return;
85: }
86: my $results_file = $r->dir_config('lonDaemons').'/tmp/'.$reply->{$home};
87: my $endfile = $results_file.'.end';
88: ##
89: ## Check for the results
90: &Apache::lonhtmlcommon::Update_PrgWin
91: ($r,$prog_state,&mt('Waiting for results'));
92: my $maxtime = 500;
93: my $starttime = time;
94: while (! -e $endfile && (time-$starttime < $maxtime)) {
1.4 matthew 95: &Apache::lonhtmlcommon::Update_PrgWin
96: ($r,$prog_state,&mt('Waiting up to [_1] seconds for results',
97: $starttime+$maxtime-time));
1.2 matthew 98: sleep(1);
99: }
100: if (! -e $endfile) {
101: $r->print('<h2>'.
102: &mt('Unable to retrieve data.').'</h2>');
103: $r->print(&mt('Please try again in a few minutes.'));
104: return;
105: }
1.5 matthew 106: $r->rflush();
1.10 matthew 107: #
1.2 matthew 108: &Apache::lonhtmlcommon::Update_PrgWin
109: ($r,$prog_state,&mt('Parsing results'));
1.10 matthew 110: #
1.5 matthew 111: &output_results($r,$results_file,$navmap,$mode);
1.16 ! albertel 112: my ($sname,$sdom) = ($mode=~/^student:(.*):(.*)$/);
! 113: $r->print(&Apache::loncommon::track_student_link(
! 114: 'View more activity by this student',
! 115: $sname,$sdom,undef,
! 116: ($env{'form.start'}+$num_records)));
! 117:
1.5 matthew 118: &Apache::lonhtmlcommon::Update_PrgWin($r,$prog_state,&mt('Finished!'));
1.4 matthew 119: return;
120: }
121:
1.10 matthew 122: sub table_names {
1.15 albertel 123: my $cid = $env{'request.course.id'};
124: my $domain = $env{'course.'.$cid.'.domain'};
125: my $home = $env{'course.'.$cid.'.home'};
126: my $course = $env{'course.'.$cid.'.num'};
1.10 matthew 127: my $prefix = $course.'_'.$domain.'_';
128: #
129: my %tables =
1.13 matthew 130: ( student =>&Apache::lonmysql::fix_table_name($prefix.'students'),
131: res =>&Apache::lonmysql::fix_table_name($prefix.'resource'),
132: machine =>&Apache::lonmysql::fix_table_name($prefix.'machine_table'),
133: activity=>&Apache::lonmysql::fix_table_name($prefix.'activity'),
1.10 matthew 134: );
135: return %tables;
136: }
137:
138: sub get_max_time_in_db {
139: my ($r,$prog_state) = @_;
140: my %table = &table_names();
141: my $query = qq{SELECT MAX(time) FROM $table{'activity'} };
142: #
1.15 albertel 143: my $home = $env{'course.'.$env{'request.course.id'}.'.home'};
1.10 matthew 144: my $reply=&Apache::lonnet::metadata_query($query,undef,undef,[$home]);
145: if (ref($reply) ne 'HASH') {
146: return undef;
147: }
148: my $results_file = $r->dir_config('lonDaemons').'/tmp/'.$reply->{$home};
149: my $endfile = $results_file.'.end';
150: ##
151: ## Check for the results
152: &Apache::lonhtmlcommon::Update_PrgWin
153: ($r,$prog_state,&mt('Waiting for results'));
154: my $maxtime = 500;
155: my $starttime = time;
156: while (! -e $endfile && (time-$starttime < $maxtime)) {
157: &Apache::lonhtmlcommon::Update_PrgWin
158: ($r,$prog_state,&mt('Waiting up to [_1] seconds for results',
159: $starttime+$maxtime-time));
160: sleep(1);
161: }
162: if (! -e $endfile) {
163: $r->print('<h2>'.
164: &mt('Unable to retrieve data.').'</h2>');
165: $r->print(&mt('Please try again in a few minutes.'));
166: return undef;
167: }
168: $r->rflush();
169: #
170: &Apache::lonhtmlcommon::Update_PrgWin
171: ($r,$prog_state,&mt('Parsing results'));
172: #
173: if (! open(TIMEDATA,$results_file)) {
174: $r->print('<h2>'.&mt('Unable to read results file.').'</h2>'.
175: '<p>'.
176: &mt('This is a serious error and has been logged. '.
177: 'You should contact your system administrator '.
178: 'to resolve this issue.').
179: '</p>');
180: return;
181: }
182: #
183: my $timestr = '';
184: while (my $line = <TIMEDATA>) {
185: chomp($line);
186: $timestr = &Apache::lonnet::unescape($line);
187: }
188: close(TIMEDATA);
1.12 matthew 189: return &Apache::lonmysql::unsqltime($timestr);
1.10 matthew 190: }
191:
1.5 matthew 192: sub build_query {
193: my ($mode) = @_;
1.15 albertel 194: my $cid = $env{'request.course.id'};
195: my $domain = $env{'course.'.$cid.'.domain'};
196: my $home = $env{'course.'.$cid.'.home'};
197: my $course = $env{'course.'.$cid.'.num'};
1.5 matthew 198: my $prefix = $course.'_'.$domain.'_';
1.16 ! albertel 199: my $start = ($env{'form.start'}+0);
1.5 matthew 200: #
1.10 matthew 201: my %table = &table_names();
1.5 matthew 202: #
203: my $query;
204: if ($mode eq 'full_class') {
205: $query = qq{
206: SELECT B.resource,A.time,C.student,A.action,E.machine,A.action_values
1.10 matthew 207: FROM $table{'activity'} AS A
208: LEFT JOIN $table{'res'} AS B ON B.res_id=A.res_id
209: LEFT JOIN $table{'student'} AS C ON C.student_id=A.student_id
210: LEFT JOIN $table{'machine'} AS E ON E.machine_id=A.machine_id
1.5 matthew 211: ORDER BY A.time DESC
1.16 ! albertel 212: LIMIT $start, $num_records
1.5 matthew 213: };
214: } elsif ($mode =~ /^student:(.*):(.*)$/) {
215: my $student = $1.':'.$2;
216: $query = qq{
1.6 matthew 217: SELECT B.resource,A.time,A.action,E.machine,A.action_values
1.10 matthew 218: FROM $table{'activity'} AS A
219: LEFT JOIN $table{'res'} AS B ON B.res_id=A.res_id
220: LEFT JOIN $table{'student'} AS C ON C.student_id=A.student_id
221: LEFT JOIN $table{'machine'} AS E ON E.machine_id=A.machine_id
1.6 matthew 222: WHERE C.student='$student'
223: ORDER BY A.time DESC
1.16 ! albertel 224: LIMIT $start, $num_records
1.6 matthew 225: };
1.5 matthew 226: }
227: $query =~ s|$/||g;
228: return $query;
229: }
230:
231: ###################################################################
232: ###################################################################
1.4 matthew 233: sub output_results {
1.5 matthew 234: my ($r,$results_file,$navmap,$mode) = @_;
1.6 matthew 235: ##
236: ##
1.12 matthew 237: if (! -s $results_file) {
238: # results file is empty, just let them know there is no data
239: $r->print('<h2>'.&mt('No data was returned for your request').'</h2>');
240: return;
241: }
1.2 matthew 242: if (! open(ACTIVITYDATA,$results_file)) {
1.4 matthew 243: $r->print('<h2>'.&mt('Unable to read results file.').'</h2>'.
244: '<p>'.
245: &mt('This is a serious error and has been logged. '.
246: 'You should contact your system administrator '.
247: 'to resolve this issue.').
248: '</p>');
1.2 matthew 249: return;
250: }
1.6 matthew 251: ##
252: ##
1.5 matthew 253: my $tableheader;
254: if ($mode eq 'full_class') {
255: $tableheader =
256: '<table><tr>'.
257: '<th>'.&mt('Resource').'</th>'.
258: '<th>'.&mt('Time').'</th>'.
259: '<th>'.&mt('Student').'</th>'.
260: '<th>'.&mt('Action').'</th>'.
1.6 matthew 261: # '<th>'.&mt('Originating Server').'</th>'.
262: '<th align="left">'.&mt('Data').'</th>'.
263: '</tr>'.$/;
264: } elsif ($mode =~ /^student:(.*):(.*)$/) {
265: $tableheader =
266: '<table><tr>'.
267: '<th>'.&mt('Resource').'</th>'.
268: '<th>'.&mt('Time').'</th>'.
269: '<th>'.&mt('Action').'</th>'.
270: # '<th>'.&mt('Originating Server').'</th>'.
271: '<th align="left">'.&mt('Data').'</th>'.
1.5 matthew 272: '</tr>'.$/;
273: }
1.16 ! albertel 274: my $count = $env{'form.start'}-1;
1.2 matthew 275: $r->rflush();
1.6 matthew 276: ##
277: ##
1.2 matthew 278: while (my $line = <ACTIVITYDATA>) {
1.10 matthew 279: # FIXME: does not pass symbs along :(
1.6 matthew 280: chomp($line);
1.2 matthew 281: $line = &Apache::lonnet::unescape($line);
282: if (++$count % 50 == 0) {
1.5 matthew 283: if ($count != 0) {
284: $r->print('</table>'.$/);
285: $r->rflush();
286: }
1.2 matthew 287: $r->print($tableheader);
288: }
1.5 matthew 289: my ($symb,$timestamp,$student,$action,$machine,$values);
290: if ($mode eq 'full_class') {
1.11 albertel 291: ($symb,$timestamp,$student,$action,$machine,$values) = split(',',$line,6);
1.5 matthew 292: } else {
1.11 albertel 293: ($symb,$timestamp,$action,$machine,$values) = split(',',$line,5);
1.5 matthew 294: }
1.11 albertel 295: foreach ($symb,$timestamp,$student,$action,$machine) {
296: $_=&Apache::lonnet::unescape($_);
297: }
1.2 matthew 298: my ($title,$src);
1.4 matthew 299: if ($symb =~ m:^/adm/:) {
1.2 matthew 300: $title = $symb;
301: $src = $symb;
302: } else {
1.4 matthew 303: my $nav_res = $navmap->getBySymb($symb);
304: if (defined($nav_res)) {
1.11 albertel 305: $title = $nav_res->compTitle();
1.4 matthew 306: $src = $nav_res->src();
307: } else {
1.6 matthew 308: if ($src =~ m|^/res|) {
309: $title = $src;
310: } elsif ($values =~ /^\s*$/ &&
311: (! defined($src) || $src =~ /^\s*$/)) {
312: next;
313: } elsif ($values =~ /^\s*$/) {
314: $values = $src;
315: } else {
316: $title = 'unable to retrieve title';
317: $src = '/dev/null';
318: }
1.4 matthew 319: }
1.2 matthew 320: }
1.6 matthew 321: my %classes;
322: my $class_count=0;
323: if (! exists($classes{$symb})) {
324: $classes{$symb} = $class_count++;
325: }
326: my $class = 'a';#.$classes{$symb};
1.4 matthew 327: #
1.5 matthew 328: if ($symb eq '/prtspool/') {
1.4 matthew 329: $class = 'print';
330: $title = 'retrieve printout';
331: } elsif ($symb =~ m|^/adm/([^/]+)|) {
332: $class = $1;
333: } elsif ($symb =~ m|^/adm/|) {
334: $class = 'adm';
335: }
336: if ($title eq 'unable to retrieve title') {
337: $title =~ s/ /\ /g;
338: $class = 'warning';
339: }
340: if (! defined($title) || $title eq '') {
341: $title = 'untitled';
342: $class = 'warning';
343: }
1.6 matthew 344: # Clean up the values
1.11 albertel 345: $values = &display_values($action,$values);
1.6 matthew 346: #
347: # Build the row for output
1.16 ! albertel 348: my $tablerow = qq{<tr class="$class"><td>}.($count+1).qq{</td>};
1.6 matthew 349: if ($src =~ m|^/adm/|) {
350: $tablerow .=
1.11 albertel 351: '<td valign="top"><nobr>'.$title.'</nobr></td>';
1.6 matthew 352: } else {
353: $tablerow .=
1.11 albertel 354: '<td valign="top"><nobr>'.
1.6 matthew 355: '<a href="'.$src.'">'.$title.'</a>'.
356: '</nobr></td>';
1.5 matthew 357: }
1.11 albertel 358: $tablerow .= '<td valign="top"><nobr>'.$timestamp.'</nobr></td>';
1.5 matthew 359: if ($mode eq 'full_class') {
1.11 albertel 360: $tablerow.='<td valign="top">'.$student.'</td>';
1.5 matthew 361: }
1.6 matthew 362: $tablerow .=
1.11 albertel 363: '<td valign="top">'.$action.'</td>'.
1.6 matthew 364: # '<td>'.$machine.'</td>'.
1.11 albertel 365: '<td valign="top">'.$values.'</td>'.
1.6 matthew 366: '</tr>';
367: $r->print($tablerow.$/);
1.2 matthew 368: }
1.16 ! albertel 369: $r->print('</table>'.$/);### if (! $count % 50);
1.2 matthew 370: close(ACTIVITYDATA);
371: return;
372: }
373:
1.5 matthew 374: ###################################################################
375: ###################################################################
1.11 albertel 376: sub display_values {
377: my ($action,$values)=@_;
378: my $result='<table>';
379: if ($action eq 'CSTORE') {
380: my %values=map {split('=',$_,-1)} split(/\&/,$values);
381: foreach my $key (sort(keys(%values))) {
382: $result.='<tr><td align="right">'.
383: &Apache::lonnet::unescape($key).
384: '</td><td>=</td><td align="left">'.
385: &Apache::lonnet::unescape($values{$key}).'</td></tr>';
386: }
387: $result.='</table>';
388: } elsif ($action eq 'POST') {
389: my %values=
390: map {split('=',&Apache::lonnet::unescape($_),-1)} split(/\&/,$values);
391: foreach my $key (sort(keys(%values))) {
392: if ($key eq 'counter') { next; }
393: $result.='<tr><td align="right">'.$key.'</td>'.
394: '<td>=</td><td align="left">'.$values{$key}.'</td></tr>';
395: }
396: $result.='</table>';
397: } else {
398: $result=&Apache::lonnet::unescape($values)
399: }
400: return $result;
401: }
402: ###################################################################
403: ###################################################################
1.1 matthew 404: sub request_data_update {
405: my $command = 'prepare activity log';
1.15 albertel 406: my $cid = $env{'request.course.id'};
407: my $domain = $env{'course.'.$cid.'.domain'};
408: my $home = $env{'course.'.$cid.'.home'};
409: my $course = $env{'course.'.$cid.'.num'};
1.6 matthew 410: # &Apache::lonnet::logthis($command.' '.$course.' '.$domain.' '.$home);
1.1 matthew 411: my $result = &Apache::lonnet::metadata_query($command,$course,$domain,
412: [$home]);
413: return $result;
414: }
415:
416: ###################################################################
417: ###################################################################
1.5 matthew 418: sub pick_student {
419: my ($r) = @_;
420: $r->print("Sorry, cannot display classlist at this time. Come back another time.");
421: return;
422: }
1.1 matthew 423:
1.5 matthew 424: ###################################################################
425: ###################################################################
1.4 matthew 426: sub styles {
427: return <<END;
1.5 matthew 428: <style type="text/css">
1.6 matthew 429: tr.warning { background-color: \#CCCCCC; }
430: tr.chat { background-color: \#CCCCCC; }
431: tr.chatfetch { background-color: \#CCCCCC; }
432: tr.navmaps { background-color: \#CCCCCC; }
433: tr.roles { background-color: \#CCCCCC; }
434: tr.flip { background-color: \#CCCCCC; }
435: tr.adm { background-color: \#CCCCCC; }
436: tr.print { background-color: \#CCCCCC; }
437: tr.printout { background-color: \#CCCCCC; }
438: tr.parmset { background-color: \#CCCCCC; }
439: tr.grades { background-color: \#CCCCCC; }
440: </style>
441: END
442: }
443:
444: sub developer_centric_styles {
445: return <<END;
446: <style type="text/css">
1.4 matthew 447: tr.warning { background-color: red; }
448: tr.chat { background-color: yellow; }
449: tr.chatfetch { background-color: yellow; }
1.7 matthew 450: tr.evaluate { background-color: red; }
1.4 matthew 451: tr.navmaps { background-color: \#777777; }
452: tr.roles { background-color: \#999999; }
453: tr.flip { background-color: \#BBBBBB; }
454: tr.adm { background-color: green; }
455: tr.print { background-color: blue; }
1.6 matthew 456: tr.parmset { background-color: \#000088; }
1.4 matthew 457: tr.printout { background-color: blue; }
1.6 matthew 458: tr.grades { background-color: \#CCCCCC; }
1.5 matthew 459: </style>
1.4 matthew 460: END
461: }
1.1 matthew 462:
463: ###################################################################
464: ###################################################################
465: sub handler {
466: my $r=shift;
467: my $c = $r->connection();
468: #
469: # Check for overloading here and on the course home server
470: my $loaderror=&Apache::lonnet::overloaderror($r);
471: if ($loaderror) { return $loaderror; }
472: $loaderror=
473: &Apache::lonnet::overloaderror
474: ($r,
1.15 albertel 475: $env{'course.'.$env{'request.course.id'}.'.home'});
1.1 matthew 476: if ($loaderror) { return $loaderror; }
477: #
478: # Check for access
1.15 albertel 479: if (! &Apache::lonnet::allowed('vsa',$env{'request.course.id'})) {
480: $env{'user.error.msg'}=
1.1 matthew 481: $r->uri.":vsa:0:0:Cannot student activity for complete course";
482: if (!
483: &Apache::lonnet::allowed('vsa',
1.15 albertel 484: $env{'request.course.id'}.'/'.
485: $env{'request.course.sec'})) {
486: $env{'user.error.msg'}=
1.1 matthew 487: $r->uri.":vsa:0:0:Cannot view student activity with given role";
488: return HTTP_NOT_ACCEPTABLE;
489: }
490: }
491: #
492: # Send the header
493: &Apache::loncommon::no_cache($r);
494: &Apache::loncommon::content_type($r,'text/html');
495: $r->send_http_header;
496: if ($r->header_only) { return OK; }
497: #
498: # Extract form elements from query string
499: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.16 ! albertel 500: ['selected_student','start']);
1.1 matthew 501: #
1.2 matthew 502: # We will almost always need this...
503: my $navmap = Apache::lonnavmaps::navmap->new();
1.1 matthew 504: #
505: &Apache::lonhtmlcommon::clear_breadcrumbs();
506: &Apache::lonhtmlcommon::add_breadcrumb({href=>'/adm/studentactivity',
507: title=>'Student Activity',
508: text =>'Student Activity',
509: faq=>139,
510: bug=>'instructor interface'});
511: #
1.2 matthew 512: # Give the LON-CAPA page header
1.14 albertel 513: my $html=&Apache::lonxml::xmlbegin();
514: $r->print($html.'<head>'.&styles().'<title>'.
1.2 matthew 515: &mt('Student Activity').
516: "</title></head>\n".
517: &Apache::loncommon::bodytag('Student Activity').
518: &Apache::lonhtmlcommon::breadcrumbs(undef,'Student Activity'));
519: $r->rflush();
520: #
1.1 matthew 521: # Begin form output
1.2 matthew 522: $r->print('<form name="trackstudent" method="post" action="/adm/trackstudent">');
523: $r->print('<br />');
524: $r->print('<div name="statusline">'.
525: &mt('Status:[_1]',
526: '<input type="text" name="status" size="60" value="" />').
527: '</div>');
1.1 matthew 528: $r->rflush();
1.2 matthew 529: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
530: ($r,&mt('Student Activity Retrieval'),
531: &mt('Student Activity Retrieval'),undef,'inline',undef,
532: 'trackstudent','status');
533: &Apache::lonhtmlcommon::Update_PrgWin
534: ($r,\%prog_state,&mt('Contacting course home server'));
1.1 matthew 535: #
536: my $result = &request_data_update();
537: #
1.15 albertel 538: if (exists($env{'form.selected_student'})) {
1.4 matthew 539: # For now, just show all the data, in the future allow selection of
540: # a student
1.15 albertel 541: my ($sname,$sdom) = split(':',$env{'form.selected_student'});
1.6 matthew 542: if ($sname =~ /^\w*$/ && $sdom =~ /^\w*$/) {
543: $r->print('<h2>'.
544: &mt('Recent activity of [_1]@[_2]',$sname,$sdom).
545: '</h2>');
1.8 matthew 546: $r->print('<p>'.&mt(<<END).'</p>');
547: Compiling student activity data can take a long time.
548: It may be necessary to reload this page to get the most current information.
549: END
1.6 matthew 550: &get_data($r,\%prog_state,$navmap,
1.15 albertel 551: 'student:'.$env{'form.selected_student'});
1.6 matthew 552: } else {
553: $r->print('<h2>'.&mt('Unable to process for [_1]@[_2]',
554: $sname,$sdom).'</h2>');
555: }
1.1 matthew 556: } else {
1.4 matthew 557: # For now, just show all the data instead of limiting it to one student
1.5 matthew 558: &get_data($r,\%prog_state,$navmap,'full_class');
1.1 matthew 559: }
560: #
1.4 matthew 561: &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Done'));
562: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1.2 matthew 563: #
1.1 matthew 564: $r->print("</form>\n");
565: $r->print("</body>\n</html>\n");
566: $r->rflush();
567: #
568: return OK;
569: }
570:
571: 1;
572:
573: #######################################################
574: #######################################################
575:
576: =pod
577:
578: =back
579:
580: =cut
581:
582: #######################################################
583: #######################################################
584:
585: __END__
586:
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