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   1  <?php
   2  
   3  /**
   4   * PHPExcel_CachedObjectStorage_MemoryGZip
   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_MemoryGZip extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache
  29  {
  30      /**
  31       * Store cell data in cache for the current cell object if it's "dirty",
  32       *     and the 'nullify' the current cell object
  33       *
  34       * @return    void
  35       * @throws    PHPExcel_Exception
  36       */
  37      protected function storeData()
  38      {
  39          if ($this->currentCellIsDirty && !empty($this->currentObjectID)) {
  40              $this->currentObject->detach();
  41  
  42              $this->cellCache[$this->currentObjectID] = gzdeflate(serialize($this->currentObject));
  43              $this->currentCellIsDirty = false;
  44          }
  45          $this->currentObjectID = $this->currentObject = null;
  46      }
  47  
  48  
  49      /**
  50       * Add or Update a cell in cache identified by coordinate address
  51       *
  52       * @param    string            $pCoord        Coordinate address of the cell to update
  53       * @param    PHPExcel_Cell    $cell        Cell to update
  54       * @return    PHPExcel_Cell
  55       * @throws    PHPExcel_Exception
  56       */
  57      public function addCacheData($pCoord, PHPExcel_Cell $cell)
  58      {
  59          if (($pCoord !== $this->currentObjectID) && ($this->currentObjectID !== null)) {
  60              $this->storeData();
  61          }
  62  
  63          $this->currentObjectID = $pCoord;
  64          $this->currentObject = $cell;
  65          $this->currentCellIsDirty = true;
  66  
  67          return $cell;
  68      }
  69  
  70  
  71      /**
  72       * Get cell at a specific coordinate
  73       *
  74       * @param     string             $pCoord        Coordinate of the cell
  75       * @throws     PHPExcel_Exception
  76       * @return     PHPExcel_Cell     Cell that was found, or null if not found
  77       */
  78      public function getCacheData($pCoord)
  79      {
  80          if ($pCoord === $this->currentObjectID) {
  81              return $this->currentObject;
  82          }
  83          $this->storeData();
  84  
  85          //    Check if the entry that has been requested actually exists
  86          if (!isset($this->cellCache[$pCoord])) {
  87              //    Return null if requested entry doesn't exist in cache
  88              return null;
  89          }
  90  
  91          //    Set current entry to the requested entry
  92          $this->currentObjectID = $pCoord;
  93          $this->currentObject = unserialize(gzinflate($this->cellCache[$pCoord]));
  94          //    Re-attach this as the cell's parent
  95          $this->currentObject->attach($this);
  96  
  97          //    Return requested entry
  98          return $this->currentObject;
  99      }
 100  
 101  
 102      /**
 103       * Get a list of all cell addresses currently held in cache
 104       *
 105       * @return  string[]
 106       */
 107      public function getCellList()
 108      {
 109          if ($this->currentObjectID !== null) {
 110              $this->storeData();
 111          }
 112  
 113          return parent::getCellList();
 114      }
 115  
 116  
 117      /**
 118       * Clear the cell collection and disconnect from our parent
 119       *
 120       * @return    void
 121       */
 122      public function unsetWorksheetCells()
 123      {
 124          if (!is_null($this->currentObject)) {
 125              $this->currentObject->detach();
 126              $this->currentObject = $this->currentObjectID = null;
 127          }
 128          $this->cellCache = array();
 129  
 130          //    detach ourself from the worksheet, so that it can then delete this object successfully
 131          $this->parent = null;
 132      }
 133  }