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   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   * Multiclass test indicator.
  19   *
  20   * @package   core_analytics
  21   * @copyright 2019 Vlad Apetrei
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  /**
  28   * Multiclass test indicator.
  29   *
  30   * @package   core_analytics
  31   * @copyright 2019 Vlad Apetrei
  32   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  33   */
  34  class test_indicator_multiclass extends \core_analytics\local\indicator\linear {
  35  
  36      /**
  37       * Returns a lang_string object representing the name for the indicator.
  38       *
  39       * Used as column identificator.
  40       *
  41       * If there is a corresponding '_help' string this will be shown as well.
  42       *
  43       * @return \lang_string
  44       */
  45      public static function get_name() : \lang_string {
  46          // Using a string that exists and contains a corresponding '_help' string.
  47          return new \lang_string('allowstealthmodules');
  48      }
  49  
  50      /**
  51       * include_averages
  52       *
  53       * @return bool
  54       */
  55      protected static function include_averages() {
  56          return false;
  57      }
  58  
  59      /**
  60       * required_sample_data
  61       *
  62       * @return string[]
  63       */
  64      public static function required_sample_data() {
  65          return array('course');
  66      }
  67  
  68      /**
  69       * calculate_sample
  70       *
  71       * @param int $sampleid
  72       * @param string $samplesorigin
  73       * @param int $starttime
  74       * @param int $endtime
  75       * @return float
  76       */
  77      protected function calculate_sample($sampleid, $samplesorigin, $starttime, $endtime) {
  78  
  79          $course = $this->retrieve('course', $sampleid);
  80  
  81          $firstchar = substr($course->fullname, 0, 1);
  82          if ($firstchar === 'a') {
  83              return 1;
  84          } else if ($firstchar === 'b') {
  85              return -1;
  86          } else if ($firstchar === 'c') {
  87              return 1;
  88          } else {
  89              return self::MAX_VALUE;
  90          }
  91      }
  92  }