grade/export/xml/grade_export_xml.php

   1 <?php //$Id$
   2
   3 ///////////////////////////////////////////////////////////////////////////
   4 //                                                                       //
   5 // NOTICE OF COPYRIGHT                                                   //
   6 //                                                                       //
   7 // Moodle - Modular Object-Oriented Dynamic Learning Environment         //
   8 //          http://moodle.com                                            //
   9 //                                                                       //
  10 // Copyright (C) 1999 onwards  Martin Dougiamas  http://moodle.com       //
  11 //                                                                       //
  12 // This program is free software; you can redistribute it and/or modify  //
  13 // it under the terms of the GNU General Public License as published by  //
  14 // the Free Software Foundation; either version 2 of the License, or     //
  15 // (at your option) any later version.                                   //
  16 //                                                                       //
  17 // This program is distributed in the hope that it will be useful,       //
  18 // but WITHOUT ANY WARRANTY; without even the implied warranty of        //
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
  20 // GNU General Public License for more details:                          //
  21 //                                                                       //
  22 //          http://www.gnu.org/copyleft/gpl.html                         //
  23 //                                                                       //
  24 ///////////////////////////////////////////////////////////////////////////
  25
  26 require_once($CFG->dirroot.'/grade/export/lib.php');
  27
  28 class grade_export_xml extends grade_export {
  29
  30     var $plugin = 'xml';
  31     var $updatedgradesonly = false; // default to export ALL grades
  32
  33     /**
  34      * To be implemented by child classes
  35      * @param boolean $feedback
  36      * @param boolean $publish Whether to output directly, or send as a file
  37      * @return string
  38      */
  39     function print_grades($feedback = false) {
  40         global $CFG;
  41         require_once($CFG->libdir.'/filelib.php');
  42
  43         $export_tracking = $this->track_exports();
  44
  45         $strgrades = get_string('grades');
  46
  47         /// Calculate file name
  48         $downloadfilename = clean_filename("{$this->course->shortname} $strgrades.xml");
  49
  50         make_upload_directory('temp/gradeexport', false);
  51         $tempfilename = $CFG->dataroot .'/temp/gradeexport/'. md5(sesskey().microtime().$downloadfilename);
  52         if (!$handle = fopen($tempfilename, 'w+b')) {
  53             error("Could not create a temporary file into which to dump the XML data.");
  54             return false;
  55         }
  56
  57         /// time stamp to ensure uniqueness of batch export
  58         fwrite($handle,  '<results batch="xml_export_'.time().'">'."\n");
  59
  60         $export_buffer = array();
  61
  62         $geub = new grade_export_update_buffer();
  63         $gui = new graded_users_iterator($this->course, $this->columns, $this->groupid);
  64         $gui->init();
  65         while ($userdata = $gui->next_user()) {
  66             $user = $userdata->user;
  67
  68             if (empty($user->idnumber)) {
  69                 //id number must exist
  70                 continue;
  71             }
  72
  73             // studentgrades[] index should match with corresponding $index
  74             foreach ($userdata->grades as $itemid => $grade) {
  75                 $grade_item = $this->grade_items[$itemid];
  76                 $grade->grade_item =& $grade_item;
  77                 $gradestr = $this->format_grade($grade); // no formating for now
  78
  79                 // MDL-11669, skip exported grades or bad grades (if setting says so)
  80                 if ($export_tracking) {
  81                     $status = $geub->track($grade);
  82                     if ($this->updatedgradesonly && ($status == 'nochange' || $status == 'unknown')) {
  83                         continue;
  84                     }
  85                 }
  86
  87                 fwrite($handle,  "\t<result>\n");
  88
  89                 if ($export_tracking) {
  90                     fwrite($handle,  "\t\t<state>$status</state>\n");
  91                 }
  92
  93                 // only need id number
  94                 fwrite($handle,  "\t\t<assignment>{$grade_item->idnumber}</assignment>\n");
  95                 // this column should be customizable to use either student id, idnumber, uesrname or email.
  96                 fwrite($handle,  "\t\t<student>{$user->idnumber}</student>\n");
  97                 fwrite($handle,  "\t\t<score>$gradestr</score>\n");
  98                 if ($this->export_feedback) {
  99                     $feedbackstr = $this->format_feedback($userdata->feedbacks[$itemid]);
 100                     fwrite($handle,  "\t\t<feedback>$feedbackstr</feedback>\n");
 101                 }
 102                 fwrite($handle,  "\t</result>\n");
 103             }
 104         }
 105         fwrite($handle,  "</results>");
 106         fclose($handle);
 107         $gui->close();
 108         $geub->close();
 109
 110         @header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
 111         @header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
 112         @header('Pragma: no-cache');
 113         header("Content-type: text/xml; charset=UTF-8");
 114         header("Content-Disposition: attachment; filename=\"$downloadfilename\"");
 115
 116         readfile_chunked($tempfilename);
 117
 118         @unlink($tempfilename);
 119
 120         exit();
 121     }
 122 }
 123
 124 ?>