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Differences Between: [Versions 310 and 403] [Versions 311 and 403] [Versions 39 and 403] [Versions 400 and 403] [Versions 401 and 403]

   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  use mod_quiz\local\access_rule_base;
  18  use mod_quiz\quiz_settings;
  19  
  20  /**
  21   * A rule imposing the delay between attempts settings.
  22   *
  23   * @package   quizaccess_delaybetweenattempts
  24   * @copyright 2009 Tim Hunt
  25   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26   */
  27  class quizaccess_delaybetweenattempts extends access_rule_base {
  28  
  29      public static function make(quiz_settings $quizobj, $timenow, $canignoretimelimits) {
  30          if (empty($quizobj->get_quiz()->delay1) && empty($quizobj->get_quiz()->delay2)) {
  31              return null;
  32          }
  33  
  34          return new self($quizobj, $timenow);
  35      }
  36  
  37      public function prevent_new_attempt($numprevattempts, $lastattempt) {
  38          if ($this->quiz->attempts > 0 && $numprevattempts >= $this->quiz->attempts) {
  39              // No more attempts allowed anyway.
  40              return false;
  41          }
  42          if ($this->quiz->timeclose != 0 && $this->timenow > $this->quiz->timeclose) {
  43              // No more attempts allowed anyway.
  44              return false;
  45          }
  46          $nextstarttime = $this->compute_next_start_time($numprevattempts, $lastattempt);
  47          if ($this->timenow < $nextstarttime) {
  48              if ($this->quiz->timeclose == 0 || $nextstarttime <= $this->quiz->timeclose) {
  49                  return get_string('youmustwait', 'quizaccess_delaybetweenattempts',
  50                          userdate($nextstarttime));
  51              } else {
  52                  return get_string('youcannotwait', 'quizaccess_delaybetweenattempts');
  53              }
  54          }
  55          return false;
  56      }
  57  
  58      /**
  59       * Compute the next time a student would be allowed to start an attempt,
  60       * according to this rule.
  61       * @param int $numprevattempts number of previous attempts.
  62       * @param stdClass $lastattempt information about the previous attempt.
  63       * @return number the time.
  64       */
  65      protected function compute_next_start_time($numprevattempts, $lastattempt) {
  66          if ($numprevattempts == 0) {
  67              return 0;
  68          }
  69  
  70          $lastattemptfinish = $lastattempt->timefinish;
  71          if ($this->quiz->timelimit > 0) {
  72              $lastattemptfinish = min($lastattemptfinish,
  73                      $lastattempt->timestart + $this->quiz->timelimit);
  74          }
  75  
  76          if ($numprevattempts == 1 && $this->quiz->delay1) {
  77              return $lastattemptfinish + $this->quiz->delay1;
  78          } else if ($numprevattempts > 1 && $this->quiz->delay2) {
  79              return $lastattemptfinish + $this->quiz->delay2;
  80          }
  81          return 0;
  82      }
  83  
  84      public function is_finished($numprevattempts, $lastattempt) {
  85          $nextstarttime = $this->compute_next_start_time($numprevattempts, $lastattempt);
  86          return $this->timenow <= $nextstarttime &&
  87          $this->quiz->timeclose != 0 && $nextstarttime >= $this->quiz->timeclose;
  88      }
  89  }