[Summary view]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * Fake question behaviour that is used when the actual behaviour was not
  19   * available.
  20   *
  21   * @package    qbehaviour
  22   * @subpackage missing
  23   * @copyright  2009 The Open University
  24   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25   */
  26  
  27  
  28  defined('MOODLE_INTERNAL') || die();
  29  
  30  
  31  /**
  32   * Fake question behaviour that is used when the actual behaviour
  33   * is not available.
  34   *
  35   * Imagine, for example, that a quiz attempt has been restored from another
  36   * Moodle site with more behaviours installed, or a behaviour
  37   * that used to be available in this site has been uninstalled. Obviously all we
  38   * can do is have some code to prevent fatal errors.
  39   *
  40   * The approach we take is: The rendering code is still implemented, as far as
  41   * possible. A warning is shown that behaviour specific bits may be missing.
  42   * Any attempt to process anything causes an exception to be thrown.
  43   *
  44   * @copyright  2009 The Open University
  45   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  46   */
  47  class qbehaviour_missing extends question_behaviour {
  48  
  49      public function is_compatible_question(question_definition $question) {
  50          return true;
  51      }
  52  
  53      public function summarise_action(question_attempt_step $step) {
  54          return '';
  55      }
  56  
  57      public function init_first_step(question_attempt_step $step, $variant) {
  58          throw new coding_exception('The behaviour used for this question is not available. ' .
  59                  'No processing is possible.');
  60      }
  61  
  62      public function process_action(question_attempt_pending_step $pendingstep) {
  63          throw new coding_exception('The behaviour used for this question is not available. ' .
  64                  'No processing is possible.');
  65      }
  66  
  67      public function get_min_fraction() {
  68          throw new coding_exception('The behaviour used for this question is not available. ' .
  69                  'No processing is possible.');
  70      }
  71  
  72      public function get_max_fraction() {
  73          throw new coding_exception('The behaviour used for this question is not available. ' .
  74                  'No processing is possible.');
  75      }
  76  }