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Differences Between: [Versions 39 and 401] [Versions 39 and 402] [Versions 39 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  /**
  18   * Priority Queue class to sort out db entry contents.
  19   *
  20   * @package    mod_data
  21   * @copyright  2016 Devang Gaur
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  namespace mod_data\search;
  26  
  27  defined('MOODLE_INTERNAL') || die();
  28  
  29  /**
  30   * Priority Queue class to sort out db entry contents.
  31   *
  32   * @package    mod_data
  33   * @copyright  2016 Devang Gaur
  34   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  35   */
  36  class sortedcontentqueue extends \SPLPriorityQueue {
  37  
  38      /**
  39       * @var array All contents that will be sorted.
  40       */
  41      private $contents;
  42  
  43      /**
  44       * contructor
  45       *
  46       * @param array $contents
  47       * @return void
  48       */
  49      public function __construct($contents) {
  50          $this->contents = $contents;
  51      }
  52  
  53      /**
  54       * comparator function overriden for sorting the records
  55       * ...as per 'required' and 'priotirity' field values
  56       *
  57       * @param int $key1
  58       * @param int $key2
  59       * @return bool
  60       */
  61      public function compare($key1 , $key2) {
  62          $record1 = $this->contents[$key1];
  63          $record2 = $this->contents[$key2];
  64  
  65          // If a content's fieldtype is compulsory in the database than it would have priority than any other noncompulsory content.
  66          if ( ($record1->required && $record2->required) || (!$record1->required && !$record2->required)) {
  67              if ($record1->priority === $record2->priority) {
  68                  return $key1 < $key2 ? 1 : -1;
  69              }
  70  
  71              return $record1->priority < $record2->priority ? -1 : 1;
  72  
  73          } else if ($record1->required && !$record2->required) {
  74              return 1;
  75          } else {
  76              return -1;
  77          }
  78  
  79      }
  80  }