[Summary view]

Differences Between: [Versions 310 and 402] [Versions 310 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   * Exporter based on persistent.
  19   *
  20   * @package    core
  21   * @copyright  2015 Damyon Wiese
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  namespace core\external;
  25  defined('MOODLE_INTERNAL') || die();
  26  
  27  require_once($CFG->libdir . '/externallib.php');
  28  
  29  use coding_exception;
  30  
  31  /**
  32   * Abstract exporter based on the persistent model.
  33   *
  34   * This automatically fills in the properties of the exporter from those of the persistent.
  35   *
  36   * @copyright  2015 Damyon Wiese
  37   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  38   */
  39  abstract class persistent_exporter extends exporter {
  40  
  41      /** @var \core\persistent The persistent object we will export. */
  42      protected $persistent = null;
  43  
  44      /**
  45       * Constructor - saves the persistent object, and the related objects.
  46       *
  47       * @param \core\persistent $persistent The persistent object to export.
  48       * @param array $related - An optional list of pre-loaded objects related to this persistent.
  49       */
  50      public function __construct(\core\persistent $persistent, $related = array()) {
  51          $classname = static::define_class();
  52          if (!$persistent instanceof $classname) {
  53              throw new coding_exception('Invalid type for persistent. ' .
  54                                         'Expected: ' . $classname . ' got: ' . get_class($persistent));
  55          }
  56          $this->persistent = $persistent;
  57  
  58          if (method_exists($this->persistent, 'get_context') && !isset($this->related['context'])) {
  59              $this->related['context'] = $this->persistent->get_context();
  60          }
  61  
  62          $data = $persistent->to_record();
  63          parent::__construct($data, $related);
  64      }
  65  
  66      /**
  67       * Persistent exporters get their standard properties from the persistent class.
  68       *
  69       * @return array Keys are the property names, and value their definition.
  70       */
  71      protected final static function define_properties() {
  72          $classname = static::define_class();
  73          return $classname::properties_definition();
  74      }
  75  
  76      /**
  77       * Returns the specific class the persistent should be an instance of.
  78       *
  79       * @return string
  80       */
  81      protected static function define_class() {
  82          throw new coding_exception('define_class() must be overidden.');
  83      }
  84  
  85  }