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   1  <?php
   2  
   3  /**
   4   * PHPExcel_CachedObjectStorage_Memory
   5   *
   6   * Copyright (c) 2006 - 2015 PHPExcel
   7   *
   8   * This library is free software; you can redistribute it and/or
   9   * modify it under the terms of the GNU Lesser General Public
  10   * License as published by the Free Software Foundation; either
  11   * version 2.1 of the License, or (at your option) any later version.
  12   *
  13   * This library is distributed in the hope that it will be useful,
  14   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16   * Lesser General Public License for more details.
  17   *
  18   * You should have received a copy of the GNU Lesser General Public
  19   * License along with this library; if not, write to the Free Software
  20   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  21   *
  22   * @category   PHPExcel
  23   * @package    PHPExcel_CachedObjectStorage
  24   * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
  25   * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
  26   * @version    ##VERSION##, ##DATE##
  27   */
  28  class PHPExcel_CachedObjectStorage_Memory extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache
  29  {
  30      /**
  31       * Dummy method callable from CacheBase, but unused by Memory cache
  32       *
  33       * @return    void
  34       */
  35      protected function storeData()
  36      {
  37      }
  38  
  39      /**
  40       * Add or Update a cell in cache identified by coordinate address
  41       *
  42       * @param    string            $pCoord        Coordinate address of the cell to update
  43       * @param    PHPExcel_Cell    $cell        Cell to update
  44       * @return    PHPExcel_Cell
  45       * @throws    PHPExcel_Exception
  46       */
  47      public function addCacheData($pCoord, PHPExcel_Cell $cell)
  48      {
  49          $this->cellCache[$pCoord] = $cell;
  50  
  51          //    Set current entry to the new/updated entry
  52          $this->currentObjectID = $pCoord;
  53  
  54          return $cell;
  55      }
  56  
  57  
  58      /**
  59       * Get cell at a specific coordinate
  60       *
  61       * @param     string             $pCoord        Coordinate of the cell
  62       * @throws     PHPExcel_Exception
  63       * @return     PHPExcel_Cell     Cell that was found, or null if not found
  64       */
  65      public function getCacheData($pCoord)
  66      {
  67          //    Check if the entry that has been requested actually exists
  68          if (!isset($this->cellCache[$pCoord])) {
  69              $this->currentObjectID = null;
  70              //    Return null if requested entry doesn't exist in cache
  71              return null;
  72          }
  73  
  74          //    Set current entry to the requested entry
  75          $this->currentObjectID = $pCoord;
  76  
  77          //    Return requested entry
  78          return $this->cellCache[$pCoord];
  79      }
  80  
  81  
  82      /**
  83       * Clone the cell collection
  84       *
  85       * @param    PHPExcel_Worksheet    $parent        The new worksheet
  86       */
  87      public function copyCellCollection(PHPExcel_Worksheet $parent)
  88      {
  89          parent::copyCellCollection($parent);
  90  
  91          $newCollection = array();
  92          foreach ($this->cellCache as $k => &$cell) {
  93              $newCollection[$k] = clone $cell;
  94              $newCollection[$k]->attach($this);
  95          }
  96  
  97          $this->cellCache = $newCollection;
  98      }
  99  
 100      /**
 101       * Clear the cell collection and disconnect from our parent
 102       *
 103       */
 104      public function unsetWorksheetCells()
 105      {
 106          // Because cells are all stored as intact objects in memory, we need to detach each one from the parent
 107          foreach ($this->cellCache as $k => &$cell) {
 108              $cell->detach();
 109              $this->cellCache[$k] = null;
 110          }
 111          unset($cell);
 112  
 113          $this->cellCache = array();
 114  
 115          //    detach ourself from the worksheet, so that it can then delete this object successfully
 116          $this->parent = null;
 117      }
 118  }