Return to lonstatistics.pm CVS log

Up to [LON-CAPA] / loncom / interface

First, added unescaping of $key in lond dump command.
Next, I added a new way to download student course data.  There are now
two functions for storing data, DownloadStudentCourseData and
DownloadStudentCourseDataSeparate.  These two functions base their running
on input parameters.  The option parameters are whether or not to check
the date for downloading, whether or not to store all the dumped data or
extract out the data you want, whether or not to display a status window.
The extracting data parameter will be best utilized if someone adds in the
ability to send a list of what parameters are desired and perhaps some simple
commands to affect how that data is processed, like tries, sum would
sum record the sum of all the tries for a student.  This is just an idea.

Currently, I have all the statistics modules using the extract ability.
This slightly increases in download time, but drastically reduces cache
size.  Possible ideas include pushing the extract to the lond side with a
list of parameter/commands, or even downloading everything to a temp cache,
then extract the necessary data into the cache then removing the temp
cache.  There are lots of other possibilities, which can change the download
time, cache size, and other factors.  Now, only loncoursedata handles the
downloading of data to a hash.

lonstudentassessment was changed slightly to remove ' ' as a link if the
student actually hadn't attempted the problem.

lonproblemanalysis was updated for the new str2hash type functions.  There
are a couple of (cludges/fixes) for it.  Depending on whether or not the
str2hash type functions are changed, these may or may not need to be
updated.

lonproblemstatistics was drastically overhauled.  Most of the processing
was removed.  Now, it just does its few statistics functions and outputs
the table.  Currently, I broke the graph, discussion column, and
discriminant factor columns.  These will be fixed on the next commit soon.
There is also no caching done.  This will also be remedied soon.  The
problem that will need attention with caching is to know when to update
the statistics cached data when a student's course data is updated.

Lastly, I plan to add perhaps a toggle legend display button, another graph
button(percentage correct), a button to send the CSV format(not just display),
and add a toggle button for sorting within a sequence and sorting all
the problems.

Also, I changed the look and feel to be the same as the class list page.
Also, the displaying of sequence headers and child sequences are not
working.  This will be fixed, but thought will be put into how best to
make it look and have a similiar fill for all the table combinations.

    1: # The LearningOnline Network with CAPA
    2: # (Publication Handler
    3: #
    4: # $Id: lonstatistics.pm,v 1.41 2002/08/13 00:37:18 stredwic 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: # (Navigate problems for statistical reports
   29: # YEAR=2001
   30: # 5/5,7/9,7/25/1,8/11,9/13,9/26,10/5,10/9,10/22,10/26 Behrouz Minaei
   31: # 11/1,11/4,11/16,12/14,12/16,12/18,12/20,12/31 Behrouz Minaei
   32: # YEAR=2002
   33: # 1/22,2/1,2/6,2/25,3/2,3/6,3/17,3/21,3/22,3/26,4/7,5/6 Behrouz Minaei
   34: # 5/12,5/14,5/15,5/19,5/26,7/16,25/7,29/7  Behrouz Minaei
   35: #
   36: ###
   37: 
   38: package Apache::lonstatistics; 
   39: 
   40: use strict;
   41: use Apache::Constants qw(:common :http);
   42: use Apache::lonnet();
   43: use Apache::lonhomework;
   44: use Apache::loncommon;
   45: use Apache::loncoursedata;
   46: use Apache::lonhtmlcommon;
   47: use Apache::lonproblemanalysis;
   48: use Apache::lonproblemstatistics;
   49: use Apache::lonstudentassessment;
   50: use HTML::TokeParser;
   51: use GDBM_File;
   52: 
   53: 
   54: sub CheckFormElement {
   55:     my ($cache, $ENVName, $cacheName, $default)=@_;
   56: 
   57:     if(defined($ENV{'form.'.$ENVName})) {
   58:         $cache->{$cacheName} = $ENV{'form.'.$ENVName};
   59:     } elsif(!defined($cache->{$cacheName})) {
   60:         $cache->{$cacheName} = $default;
   61:     }
   62: 
   63:     return;
   64: }
   65: 
   66: sub ProcessFormData{
   67:     my ($cache)=@_;
   68: 
   69:     $cache->{'reportKey'} = 'false';
   70: 
   71:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   72:                                             ['sort','download',
   73:                                              'reportSelected',
   74:                                              'StudentAssessmentStudent',
   75:                                              'ProblemStatisticsSort']);
   76:     &CheckFormElement($cache, 'Status', 'Status', 'Active');
   77:     &CheckFormElement($cache, 'postdata', 'reportSelected', 'Class list');
   78:     &CheckFormElement($cache, 'reportSelected', 'reportSelected', 
   79:                       'Class list');
   80:     $cache->{'reportSelected'} = 
   81:         &Apache::lonnet::unescape($cache->{'reportSelected'});
   82:     &CheckFormElement($cache, 'DownloadAll', 'DownloadAll', 'false');
   83:     &CheckFormElement($cache, 'sort', 'sort', 'fullname');
   84:     &CheckFormElement($cache, 'download', 'download', 'false');
   85: 
   86:     # student assessment
   87:     if(defined($ENV{'form.CreateStudentAssessment'}) ||
   88:        defined($ENV{'form.NextStudent'}) ||
   89:        defined($ENV{'form.PreviousStudent'})) {
   90:         $cache->{'reportSelected'} = 'Student Assessment';
   91:     }
   92:     if(defined($ENV{'form.NextStudent'})) {
   93:         $cache->{'StudentAssessmentMove'} = 'next';
   94:     } elsif(defined($ENV{'form.PreviousStudent'})) {
   95:         $cache->{'StudentAssessmentMove'} = 'previous';
   96:     } else {
   97:         $cache->{'StudentAssessmentMove'} = 'selected';
   98:     }
   99:     &CheckFormElement($cache, 'StudentAssessmentStudent', 
  100:                       'StudentAssessmentStudent', 'All Students');
  101:     $cache->{'StudentAssessmentStudent'} = 
  102:         &Apache::lonnet::unescape($cache->{'StudentAssessmentStudent'});
  103:     &CheckFormElement($cache, 'DefaultColumns', 'DefaultColumns', 'false');
  104: 
  105:     if(defined($ENV{'form.Section'})) {
  106:         my @sectionsSelected = (ref($ENV{'form.Section'}) ?
  107:                                @{$ENV{'form.Section'}} :
  108:                                 ($ENV{'form.Section'}));
  109:         $cache->{'sectionsSelected'} = join(':', @sectionsSelected);
  110:     } elsif(!defined($cache->{'sectionsSelected'})) {
  111:         $cache->{'sectionsSelected'} = $cache->{'sectionList'};
  112:     }
  113: 
  114:     # Problem analysis
  115:     &CheckFormElement($cache, 'Interval', 'Interval', '1');
  116: 
  117:     # ProblemStatistcs
  118:     &CheckFormElement($cache, 'DisplayCSVFormat',
  119:                       'DisplayFormat', 'Display Table Format');
  120:     &CheckFormElement($cache, 'ProblemStatisticsAscend',
  121:                       'ProblemStatisticsAscend', 'Ascending');
  122:     &CheckFormElement($cache, 'ProblemStatisticsMaps', 
  123:                       'ProblemStatisticsMaps', 'All Maps');
  124:     &CheckFormElement($cache, 'ProblemStatisticsSort',
  125:                       'ProblemStatisticsSort', 'Homework Sets Order');
  126: 
  127:     # Search only form elements
  128:     my @headingColumns=();
  129:     my @sequenceColumns=();
  130:     my $foundColumn = 0;
  131:     if(defined($ENV{'form.ReselectColumns'})) {
  132:         my @reselected = (ref($ENV{'form.ReselectColumns'}) ? 
  133:                           @{$ENV{'form.ReselectColumns'}}
  134:                           : ($ENV{'form.ReselectColumns'}));
  135:         foreach (@reselected) {
  136:             if(/HeadingColumn/) {
  137:                 push(@headingColumns, $_);
  138:                 $foundColumn = 1;
  139:             } elsif(/SequenceColumn/) {
  140:                 push(@sequenceColumns, $_);
  141:                 $foundColumn = 1;
  142:             }
  143:         }
  144:     }
  145: 
  146:     $cache->{'reportKey'} = 'false';
  147:     if($cache->{'reportSelected'} eq 'Analyze') {
  148:         $cache->{'reportKey'} = 'Analyze';
  149:     } elsif($cache->{'reportSelected'} eq 'DoDiffGraph') {
  150:         $cache->{'reportKey'} = 'DoDiffGraph';
  151:     } elsif($cache->{'reportSelected'} eq 'PercentWrongGraph') {
  152:         $cache->{'reportKey'} = 'PercentWrongGraph';
  153:     }
  154: 
  155:     if(defined($ENV{'form.DoDiffGraph'})) {
  156:         $cache->{'reportSelected'} = 'DoDiffGraph';
  157:         $cache->{'reportKey'} = 'DoDiffGraph';
  158:     } elsif(defined($ENV{'form.PercentWrongGraph'})) {
  159:         $cache->{'reportSelected'} = 'PercentWrongGraph';
  160:         $cache->{'reportKey'} = 'PercentWrongGraph';
  161:     }
  162: 
  163:     foreach (keys(%ENV)) {
  164:         if(/form\.Analyze/) {
  165:             $cache->{'reportSelected'} = 'Analyze';
  166:             $cache->{'reportKey'} = 'Analyze';
  167:             my $data;
  168:             (undef, $data)=split(':::', $_);
  169:             $cache->{'AnalyzeInfo'}=$data;
  170:         } elsif(/form\.HeadingColumn/) {
  171:             my $value = $_;
  172:             $value =~ s/form\.//;
  173:             push(@headingColumns, $value);
  174:             $foundColumn=1;
  175:         } elsif(/form\.SequenceColumn/) {
  176:             my $value = $_;
  177:             $value =~ s/form\.//;
  178:             push(@sequenceColumns, $value);
  179:             $foundColumn=1;
  180:         }
  181:     }
  182: 
  183:     if($foundColumn) {
  184:         $cache->{'HeadingsFound'} = join(':', @headingColumns);
  185:         $cache->{'SequencesFound'} = join(':', @sequenceColumns);;
  186:     }
  187:     if(!defined($cache->{'HeadingsFound'}) || 
  188:        $cache->{'DefaultColumns'} ne 'false') {
  189:         $cache->{'HeadingsFound'}='HeadingColumnFull Name';
  190:     }
  191:     if(!defined($cache->{'SequencesFound'}) ||
  192:        $cache->{'DefaultColumns'} ne 'false') {
  193:         $cache->{'SequencesFound'}='All Sequences';
  194:     }
  195:     $cache->{'DefaultColumns'} = 'false';
  196: 
  197:     return;
  198: }
  199: 
  200: =pod
  201: 
  202: =item &SortStudents()
  203: 
  204: Determines which students to display and in which order.  Which are 
  205: displayed are determined by their status(active/expired).  The order
  206: is determined by the sort button pressed (default to username).  The
  207: type of sorting is username, lastname, or section.
  208: 
  209: =over 4
  210: 
  211: Input: $students, $CacheData
  212: 
  213: $students: A array pointer to a list of students (username:domain)
  214: 
  215: $CacheData: A pointer to the hash tied to the cached data
  216: 
  217: Output: \@order
  218: 
  219: @order: An ordered list of students (username:domain)
  220: 
  221: =back
  222: 
  223: =cut
  224: 
  225: sub SortStudents {
  226:     my ($cache)=@_;
  227: 
  228:     my @students = split(':::',$cache->{'NamesOfStudents'});
  229:     my @sorted1Students=();
  230:     foreach (@students) {
  231:         if($cache->{'Status'} eq 'Any' || 
  232:            $cache->{$_.':Status'} eq $cache->{'Status'}) {
  233:             push(@sorted1Students, $_);
  234:         }
  235:     }
  236: 
  237:     my $sortBy = '';
  238:     if(defined($cache->{'sort'})) {
  239:         $sortBy = ':'.$cache->{'sort'};
  240:     }
  241:     my @order = sort { $cache->{$a.$sortBy} cmp $cache->{$b.$sortBy} ||
  242:                        $cache->{$a.':fullname'} cmp $cache->{$b.':fullname'} } 
  243:                 @sorted1Students;
  244: 
  245:     return \@order;
  246: }
  247: 
  248: =pod
  249: 
  250: =item &SpaceColumns()
  251: 
  252: Determines the width of all the columns in the chart.  It is based on
  253: the max of the data for that column and its header.
  254: 
  255: =over 4
  256: 
  257: Input: $students, $studentInformation, $headings, $ChartDB
  258: 
  259: $students: An array pointer to a list of students (username:domain)
  260: 
  261: $studentInformatin: The type of data for the student information.  It is
  262: used as part of the key in $CacheData.
  263: 
  264: $headings: The name of the student information columns.
  265: 
  266: $ChartDB: The name of the cache database which is opened for read/write.
  267: 
  268: Output: None - All data stored in cache.
  269: 
  270: =back
  271: 
  272: =cut
  273: 
  274: sub SpaceColumns {
  275:     my ($students,$studentInformation,$headings,$cache)=@_;
  276: 
  277:     # Initialize Lengths
  278:     for(my $index=0; $index<(scalar @$headings); $index++) {
  279:         my @titleLength=split(//,$headings->[$index]);
  280:         $cache->{$studentInformation->[$index].':columnWidth'}=
  281:             scalar @titleLength;
  282:     }
  283: 
  284:     foreach my $name (@$students) {
  285:         foreach (@$studentInformation) {
  286:             my @dataLength=split(//,$cache->{$name.':'.$_});
  287:             my $length=(scalar @dataLength);
  288:             if($length > $cache->{$_.':columnWidth'}) {
  289:                 $cache->{$_.':columnWidth'}=$length;
  290:             }
  291:         }
  292:     }
  293: 
  294:     return;
  295: }
  296: 
  297: sub PrepareData {
  298:     my ($c, $cacheDB, $studentInformation, $headings,$r)=@_;
  299: 
  300:     # Test for access to the cache data
  301:     my $courseID=$ENV{'request.course.id'};
  302:     my $isRecalculate=0;
  303:     if(defined($ENV{'form.Recalculate'})) {
  304:         $isRecalculate=1;
  305:     }
  306: 
  307:     my $isCached = &Apache::loncoursedata::TestCacheData($cacheDB, 
  308:                                                          $isRecalculate);
  309:     if($isCached < 0) {
  310:         return "Unable to tie hash to db file.";
  311:     }
  312: 
  313:     # Download class list information if not using cached data
  314:     my %cache;
  315:     unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) {
  316:         return "Unable to tie hash to db file.";
  317:     }
  318: 
  319:     if(!$isCached) {
  320:         my $processTopResourceMapReturn=
  321:             &Apache::loncoursedata::ProcessTopResourceMap(\%cache, $c, $r);
  322:         if($processTopResourceMapReturn ne 'OK') {
  323:             untie(%cache);
  324:             return $processTopResourceMapReturn;
  325:         }
  326:     }
  327: 
  328:     if($c->aborted()) {
  329:         untie(%cache);
  330:         return 'aborted'; 
  331:     }
  332: 
  333:     my $classlist=&Apache::loncoursedata::DownloadClasslist($courseID,
  334:                                                 $cache{'ClasslistTimestamp'},
  335:                                                 $c);
  336:     foreach (keys(%$classlist)) {
  337:         if(/^(con_lost|error|no_such_host)/i) {
  338:             untie(%cache);
  339:             return "Error getting student data.";
  340:         }
  341:     }
  342: 
  343:     if($c->aborted()) {
  344:         untie(%cache);
  345:         return 'aborted'; 
  346:     }
  347: 
  348:     # Active is a temporary solution, remember to change
  349:     Apache::loncoursedata::ProcessClasslist(\%cache,$classlist,$courseID,$c);
  350:     if($c->aborted()) {
  351:         untie(%cache);
  352:         return 'aborted'; 
  353:     }
  354: 
  355:     &ProcessFormData(\%cache);
  356:     my $students = &SortStudents(\%cache);
  357:     &SpaceColumns($students, $studentInformation, $headings, \%cache);
  358:     $cache{'updateTime:columnWidth'}=24;
  359: 
  360:     if($cache{'download'} ne 'false') {
  361:         my @who = ($cache{'download'});
  362:         $cache{'download'} = 'false';
  363:         if(&Apache::loncoursedata::DownloadStudentCourseData(\@who, 'false', 
  364:                                                              $cacheDB, 'true', 
  365:                                                              'false', $courseID,
  366:                                                              $r, $c) ne 'OK') {
  367:             untie(%cache);
  368:             return 'Stop at download individual';
  369:         }
  370:     } elsif($cache{'DownloadAll'} ne 'false') {
  371:         $cache{'DownloadAll'} = 'false';
  372:         my @allStudents;
  373:         if($cache{'DownloadAll'} eq 'sorted') {
  374:             @allStudents = @$students;
  375:         } else {
  376:             @allStudents = split(':::', $cache{'NamesOfStudents'});
  377:         }
  378:         if(&Apache::loncoursedata::DownloadStudentCourseData(\@allStudents, 
  379:                                                              'false', 
  380:                                                              $cacheDB, 'true', 
  381:                                                              'true', $courseID,
  382:                                                              $r, $c) ne 'OK') {
  383:             untie(%cache);
  384:             return 'Stop at download all';
  385:         }
  386:     }
  387: 
  388:     if($c->aborted()) {
  389:         untie(%cache);
  390:         return 'aborted'; 
  391:     }
  392: 
  393:     untie(%cache);
  394: 
  395:     return ('OK', $students);
  396: }
  397: 
  398: sub BuildClasslist {
  399:     my ($cacheDB,$students,$studentInformation,$headings,$r)=@_;
  400: 
  401:     my %cache;
  402:     unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
  403:         return '<html><body>Unable to tie database.</body></html>';
  404:     }
  405: 
  406:     my $Str='';
  407:     $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
  408:     $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
  409: 
  410:     my $displayString = '<td align="left"><a href="/adm/statistics?';
  411:     $displayString .= 'sort=LINKDATA">DISPLAYDATA&nbsp</a></td>'."\n";
  412:     $Str .= &Apache::lonhtmlcommon::CreateHeadings(\%cache, 
  413:                                                    $studentInformation,
  414:                                                    $headings, $displayString);
  415:     $Str .= '</tr>'."\n";
  416: 
  417:     my $alternate=0;
  418:     foreach (@$students) {
  419:         my ($username, $domain) = split(':', $_);
  420:         if($alternate) {
  421:             $Str .= '<tr bgcolor="#ffffe6">';
  422:         } else {
  423:             $Str .= '<tr bgcolor="#ffffc6">';
  424:         }
  425:         $alternate = ($alternate + 1) % 2;
  426:         foreach my $data (@$studentInformation) {
  427:             $Str .= '<td>';
  428:             if($data eq 'fullname') {
  429:                 $Str .= '<a href="/adm/statistics?reportSelected=';
  430:                 $Str .= &Apache::lonnet::escape('Student Assessment');
  431:                 $Str .= '&StudentAssessmentStudent=';
  432:                 $Str .= &Apache::lonnet::escape($cache{$_.':'.$data}).'">';
  433:                 $Str .= $cache{$_.':'.$data}.'&nbsp';
  434:                 $Str .= '</a>';
  435:             } elsif($data eq 'updateTime') {
  436:                 $Str .= '<a href="/adm/statistics?reportSelected=';
  437:                 $Str .= &Apache::lonnet::escape('Class list');
  438:                 $Str .= '&download='.$_.'">';
  439:                 $Str .= $cache{$_.':'.$data}.'&nbsp';
  440:                 $Str .= '&nbsp</a>';
  441:             } else {
  442:                 $Str .= $cache{$_.':'.$data}.'&nbsp';
  443:             }
  444: 
  445:             $Str .= '</td>'."\n";
  446:         }
  447:     }
  448: 
  449:     $Str .= '</tr>'."\n";
  450:     $Str .= '</table></td></tr></table>'."\n";
  451:     $r->print($Str);
  452:     $r->rflush();
  453: 
  454:     untie(%cache);
  455: 
  456:     return;
  457: }
  458: 
  459: sub CreateMainMenu {
  460:     my ($status, $reports)=@_;
  461: 
  462:     my $Str = '';
  463: 
  464:     $Str .= '<table border="0"><tbody><tr>'."\n";
  465:     $Str .= '<td></td><td></td>'."\n";
  466:     $Str .= '<td align="center"><b>Analysis Reports:</b></td>'."\n";
  467:     $Str .= '<td align="center"><b>Student Status:</b></td></tr>'."\n";
  468:     $Str .= '<tr>'."\n";
  469:     $Str .= '<td align="center"><input type="submit" name="Refresh" ';
  470:     $Str .= 'value="Refresh" /></td>'."\n";
  471:     $Str .= '<td align="center"><input type="submit" name="DownloadAll" ';
  472:     $Str .= 'value="Update All Student Data" /></td>'."\n";
  473:     $Str .= '<td align="center">';
  474:     $Str .= '<select name="reportSelected" onchange="document.';
  475:     $Str .= 'Statistics.submit()">'."\n";
  476: 
  477:     foreach (sort(keys(%$reports))) {
  478:         next if($_ eq 'reportSelected');
  479:         $Str .= '<option name="'.$_.'"';
  480:         if($reports->{'reportSelected'} eq $reports->{$_}) {
  481:             $Str .= ' selected=""';
  482:         }
  483:         $Str .= '>'.$reports->{$_}.'</option>'."\n";
  484:     }
  485:     $Str .= '</select></td>'."\n";
  486: 
  487:     $Str .= '<td align="center">';
  488:     $Str .= &Apache::lonhtmlcommon::StatusOptions($status, 'Statistics');
  489:     $Str .= '</td>'."\n";
  490: 
  491:     $Str .= '</tr></tbody></table>'."\n";
  492:     $Str .= '<hr>'."\n";
  493: 
  494:     return $Str;
  495: }
  496: 
  497: sub BuildStatistics {
  498:     my ($r)=@_;
  499: 
  500:     my $c = $r->connection;
  501:     my @studentInformation=('fullname','section','id','domain','username',
  502:                             'updateTime');
  503:     my @headings=('Full Name', 'Section', 'PID', 'Domain', 'User Name',
  504:                   'Last Updated');
  505:     my $spacing = '   ';
  506:     my %reports = ('classlist'          => 'Class list',
  507:                    'problem_statistics' => 'Problem Statistics',
  508:                    'student_assessment' => 'Student Assessment',
  509: #                   'activitylog'        => 'Activity Log',
  510:                    'reportSelected'     => 'Class list');
  511: 
  512:     my %cache;
  513:     my $courseID=$ENV{'request.course.id'};
  514:     my $cacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
  515:                   "_$ENV{'user.domain'}_$courseID\_statistics.db";
  516: 
  517:     $r->print(&Apache::lonhtmlcommon::Title('LON-CAPA Statistics'));
  518: 
  519:     my ($returnValue, $students) = &PrepareData($c, $cacheDB, 
  520:                                                 \@studentInformation, 
  521:                                                 \@headings,$r);
  522:     if($returnValue ne 'OK') {
  523:         $r->print($returnValue."\n".'</body></html>');
  524:         return OK;
  525:     }
  526:     if(!$c->aborted()) {
  527:         &Apache::loncoursedata::CheckForResidualDownload($cacheDB, 
  528:                                                          'true', 'true',
  529:                                                          $courseID,
  530:                                                          $r, $c);
  531:     }
  532: 
  533:     my $GoToPage;
  534:     if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
  535:         $GoToPage = $cache{'reportSelected'};
  536:         $reports{'reportSelected'} = $cache{'reportSelected'};
  537:         if(defined($cache{'reportKey'}) && 
  538:            !exists($reports{$cache{'reportKey'}}) && 
  539:            $cache{'reportKey'} ne 'false') {
  540:             $reports{$cache{'reportKey'}} = $cache{'reportSelected'};
  541:         }
  542: 
  543:         if(defined($cache{'OptionResponses'})) {
  544:             $reports{'problem_analysis'} = 'Problem Analysis';
  545:         }
  546: 
  547:         $r->print('<form name="Statistics" ');
  548:         $r->print('method="post" action="/adm/statistics">');
  549:         $r->print(&CreateMainMenu($cache{'Status'}, \%reports));
  550:         $r->rflush();
  551:         untie(%cache);
  552:     } else {
  553:         $r->print('<html><body>Unable to tie database.</body></html>');
  554:         return OK;
  555:     }
  556: 
  557:     if($GoToPage eq 'Activity Log') {
  558:         &Apache::lonproblemstatistics::Activity();
  559:     } elsif($GoToPage eq 'Problem Statistics') {
  560:         &Apache::lonproblemstatistics::BuildProblemStatisticsPage($cacheDB, 
  561:                                                                   $students, 
  562:                                                                   $courseID, 
  563:                                                                   $c,$r);
  564:     } elsif($GoToPage eq 'Problem Analysis') {
  565:         &Apache::lonproblemanalysis::BuildProblemAnalysisPage($cacheDB, $r);
  566:     } elsif($GoToPage eq 'Student Assessment') {
  567:         &Apache::lonstudentassessment::BuildStudentAssessmentPage($cacheDB,
  568:                                                           $students,
  569:                                                           $courseID,
  570:                                                           'Statistics',
  571:                                                           \@headings,
  572:                                                           $spacing,
  573:                                                           \@studentInformation,
  574:                                                           $r, $c);
  575:     } elsif($GoToPage eq 'Analyze') {
  576:         &Apache::lonproblemanalysis::BuildAnalyzePage($cacheDB, $students, 
  577:                                                       $courseID, $r);
  578:     } elsif($GoToPage eq 'DoDiffGraph' || $GoToPage eq 'PercentWrongGraph') {
  579:         &Apache::lonproblemstatistics::BuildGraphicChart($GoToPage,$r,$cacheDB);
  580:     } elsif($GoToPage eq 'Class list') {
  581:         &BuildClasslist($cacheDB, $students, \@studentInformation,
  582:                         \@headings, $r);
  583:     }
  584: 
  585:     $r->print('</form>'."\n");
  586:     $r->print("\n".'</body>'."\n".'</html>');
  587:     $r->rflush();
  588: 
  589:     return OK;
  590: }
  591: 
  592: # ================================================================ Main Handler
  593: 
  594: sub handler {
  595:     my $r=shift;
  596: 
  597: #    $jr = $r;
  598: 
  599:     unless(&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
  600:         $ENV{'user.error.msg'}=
  601:         $r->uri.":vgr:0:0:Cannot view grades for complete course";
  602:         return HTTP_NOT_ACCEPTABLE; 
  603:     }
  604: 
  605:     # Set document type for header only
  606:     if($r->header_only) {
  607:         if ($ENV{'browser.mathml'}) {
  608:             $r->content_type('text/xml');
  609:         } else {
  610:             $r->content_type('text/html');
  611:         }
  612:         &Apache::loncommon::no_cache($r);
  613:         $r->send_http_header;
  614:         return OK;
  615:     }
  616: 
  617:     unless($ENV{'request.course.fn'}) {
  618: 	my $requrl=$r->uri;
  619:         $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
  620:         return HTTP_NOT_ACCEPTABLE; 
  621:     }
  622: 
  623:     $r->content_type('text/html');
  624:     $r->send_http_header;
  625: 
  626:     &BuildStatistics($r);
  627: 
  628:     return OK;
  629: }
  630: 1;
  631: __END__
  632: