typo3/sysext/extbase/Classes/Persistence/LazyObjectStorage.php

   1 <?php
   2 /***************************************************************
   3  *  Copyright notice
   4  *
   5  *  (c) 2009 Jochen Rau <jochen.rau@typoplanet.de>
   6  *  All rights reserved
   7  *
   8  *  This class is a backport of the corresponding class of FLOW3.
   9  *  All credits go to the v5 team.
  10  *
  11  *  This script is part of the TYPO3 project. The TYPO3 project is
  12  *  free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  The GNU General Public License can be found at
  18  *  http://www.gnu.org/copyleft/gpl.html.
  19  *
  20  *  This script is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  This copyright notice MUST APPEAR in all copies of the script!
  26  ***************************************************************/
  27
  28 /**
  29  * A proxy that can replace any object and replaces itself in it's parent on
  30  * first access (call, get, set, isset, unset).
  31  *
  32  * @package Extbase
  33  * @subpackage Persistence
  34  * @version $Id$
  35  */
  36 class Tx_Extbase_Persistence_LazyObjectStorage extends Tx_Extbase_Persistence_ObjectStorage implements Tx_Extbase_Persistence_LoadingStrategyInterface {
  37
  38         /**
  39          * The object this property is contained in.
  40          *
  41          * @var object
  42          */
  43         protected $parentObject;
  44
  45         /**
  46          * The name of the property represented by this proxy.
  47          *
  48          * @var string
  49          */
  50         protected $propertyName;
  51
  52         /**
  53          * The raw field value.
  54          *
  55          * @var mixed
  56          */
  57         protected $fieldValue;
  58
  59         /**
  60          *
  61          * @var bool
  62          */
  63         protected $isInitialized = FALSE;
  64
  65         /**
  66          * Constructs this proxy instance.
  67          *
  68          * @param object $parentObject The object instance this proxy is part of
  69          * @param string $propertyName The name of the proxied property in it's parent
  70          * @param mixed $fieldValue The raw field value.
  71          */
  72         public function __construct($parentObject, $propertyName, $fieldValue) {
  73                 $this->parentObject = $parentObject;
  74                 $this->propertyName = $propertyName;
  75                 $this->fieldValue = $fieldValue;
  76         }
  77
  78         /**
  79          * This is a function lazy load implementation.
  80          *
  81          * @return void
  82          */
  83         protected function initializeStorage() {
  84                 if (!$this->isInitialized) {
  85                         $dataMapper = Tx_Extbase_Dispatcher::getPersistenceManager()->getBackend()->getDataMapper();
  86                         $objects = $dataMapper->fetchRelated($this->parentObject, $this->propertyName, $this->fieldValue, FALSE);
  87                         $storage = array();
  88                         foreach ($objects as $object) {
  89                                 $storage[spl_object_hash($object)] = $object;
  90                         }
  91                         $this->storage = $storage;
  92                         $this->parentObject->_memorizeCleanState($this->propertyName);
  93                         $this->isInitialized = TRUE;
  94                 }
  95         }
  96
  97         /**
  98          * Counts the elements in the storage array
  99          *
 100          * @return void
 101          */
 102         public function count() {
 103                 $dataMapper = Tx_Extbase_Dispatcher::getPersistenceManager()->getBackend()->getDataMapper();
 104                 $columnMap = $dataMapper->getDataMap(get_class($this->parentObject))->getColumnMap($this->propertyName);
 105                 $numberOfElements = NULL;
 106                 if ($columnMap->getTypeOfRelation() === Tx_Extbase_Persistence_Mapper_ColumnMap::RELATION_HAS_MANY) {
 107                         $parentKeyFieldName = $columnMap->getParentKeyFieldName();
 108                         $dataMapper = Tx_Extbase_Dispatcher::getPersistenceManager()->getBackend()->getDataMapper();
 109                         $numberOfElements = $dataMapper->countRelated($this->parentObject, $this->propertyName, $this->fieldValue);
 110                 } else {
 111                         $this->initializeStorage();
 112                         $numberOfElements = count($this->storage);
 113                 }
 114                 if (is_null($numberOfElements)) {
 115                         throw new Tx_Extbase_Persistence_Exception('The number of elements could not be determined.', 1252514486);
 116                 }
 117                 return $numberOfElements;
 118         }
 119
 120 }
 121 ?>