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<?php
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/**
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 * PHPExcel
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 *
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 * Copyright (c) 2006 - 2013 PHPExcel
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 * @category   PHPExcel
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 * @package    PHPExcel_CachedObjectStorage
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 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
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 * @version    ##VERSION##, ##DATE##
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 */
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/**
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 * PHPExcel_CachedObjectStorage_APC
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 *
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 * @category   PHPExcel
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 * @package    PHPExcel_CachedObjectStorage
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 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 */
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class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
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    /**
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     * Prefix used to uniquely identify cache data for this worksheet
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     *
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     * @access    private
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     * @var string
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     */
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    private $_cachePrefix = null;
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    /**
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     * Cache timeout
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     *
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     * @access    private
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     * @var integer
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     */
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    private $_cacheTime = 600;
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    /**
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     * Store cell data in cache for the current cell object if it's "dirty",
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     *     and the 'nullify' the current cell object
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     *
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     * @access  private
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     * @return  void
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     * @throws  PHPExcel_Exception
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     */
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    protected function _storeData() {
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        if ($this->_currentCellIsDirty) {
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            $this->_currentObject->detach();
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            if (!apc_store($this->_cachePrefix.$this->_currentObjectID.'.cache',serialize($this->_currentObject),$this->_cacheTime)) {
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                $this->__destruct();
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                throw new PHPExcel_Exception('Failed to store cell '.$this->_currentObjectID.' in APC');
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            }
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            $this->_currentCellIsDirty = false;
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        }
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        $this->_currentObjectID = $this->_currentObject = null;
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    }    //    function _storeData()
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    /**
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     * Add or Update a cell in cache identified by coordinate address
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     *
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     * @access  public
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     * @param   string         $pCoord  Coordinate address of the cell to update
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     * @param   PHPExcel_Cell  $cell    Cell to update
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     * @return  void
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     * @throws  PHPExcel_Exception
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     */
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    public function addCacheData($pCoord, PHPExcel_Cell $cell) {
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        if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {
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            $this->_storeData();
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        }
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        $this->_cellCache[$pCoord] = true;
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        $this->_currentObjectID = $pCoord;
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        $this->_currentObject = $cell;
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        $this->_currentCellIsDirty = true;
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        return $cell;
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    }    //    function addCacheData()
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    /**
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     * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
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     *
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     * @access  public
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     * @param   string  $pCoord  Coordinate address of the cell to check
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     * @return  void
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     * @return  boolean
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     */
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    public function isDataSet($pCoord) {
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        //    Check if the requested entry is the current object, or exists in the cache
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        if (parent::isDataSet($pCoord)) {
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            if ($this->_currentObjectID == $pCoord) {
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                return true;
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            }
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            //    Check if the requested entry still exists in apc
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            $success = apc_fetch($this->_cachePrefix.$pCoord.'.cache');
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            if ($success === FALSE) {
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                //    Entry no longer exists in APC, so clear it from the cache array
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                parent::deleteCacheData($pCoord);
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                throw new PHPExcel_Exception('Cell entry '.$pCoord.' no longer exists in APC cache');
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            }
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            return true;
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        }
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        return false;
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    }    //    function isDataSet()
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    /**
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     * Get cell at a specific coordinate
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     *
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     * @access  public
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     * @param   string         $pCoord  Coordinate of the cell
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     * @throws  PHPExcel_Exception
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     * @return  PHPExcel_Cell  Cell that was found, or null if not found
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     */
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    public function getCacheData($pCoord) {
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        if ($pCoord === $this->_currentObjectID) {
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            return $this->_currentObject;
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        }
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        $this->_storeData();
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        //    Check if the entry that has been requested actually exists
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        if (parent::isDataSet($pCoord)) {
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            $obj = apc_fetch($this->_cachePrefix.$pCoord.'.cache');
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            if ($obj === FALSE) {
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                //    Entry no longer exists in APC, so clear it from the cache array
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                parent::deleteCacheData($pCoord);
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                throw new PHPExcel_Exception('Cell entry '.$pCoord.' no longer exists in APC cache');
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            }
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        } else {
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            //    Return null if requested entry doesn't exist in cache
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            return null;
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        }
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        //    Set current entry to the requested entry
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        $this->_currentObjectID = $pCoord;
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        $this->_currentObject = unserialize($obj);
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        //    Re-attach this as the cell's parent
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        $this->_currentObject->attach($this);
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        //    Return requested entry
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        return $this->_currentObject;
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    }    //    function getCacheData()
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	/**
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	 * Get a list of all cell addresses currently held in cache
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	 *
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	 * @return  array of string
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	 */
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	public function getCellList() {
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		if ($this->_currentObjectID !== null) {
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			$this->_storeData();
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		}
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		return parent::getCellList();
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	}
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    /**
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     * Delete a cell in cache identified by coordinate address
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     *
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     * @access  public
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     * @param   string  $pCoord  Coordinate address of the cell to delete
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     * @throws  PHPExcel_Exception
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     */
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    public function deleteCacheData($pCoord) {
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        //    Delete the entry from APC
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        apc_delete($this->_cachePrefix.$pCoord.'.cache');
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        //    Delete the entry from our cell address array
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        parent::deleteCacheData($pCoord);
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    }    //    function deleteCacheData()
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    /**
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     * Clone the cell collection
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     *
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     * @access  public
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     * @param   PHPExcel_Worksheet  $parent  The new worksheet
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     * @throws  PHPExcel_Exception
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     * @return  void
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     */
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    public function copyCellCollection(PHPExcel_Worksheet $parent) {
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        parent::copyCellCollection($parent);
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        //    Get a new id for the new file name
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        $baseUnique = $this->_getUniqueID();
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        $newCachePrefix = substr(md5($baseUnique),0,8).'.';
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        $cacheList = $this->getCellList();
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        foreach($cacheList as $cellID) {
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            if ($cellID != $this->_currentObjectID) {
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                $obj = apc_fetch($this->_cachePrefix.$cellID.'.cache');
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                if ($obj === FALSE) {
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                    //    Entry no longer exists in APC, so clear it from the cache array
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                    parent::deleteCacheData($cellID);
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                    throw new PHPExcel_Exception('Cell entry '.$cellID.' no longer exists in APC');
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                }
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                if (!apc_store($newCachePrefix.$cellID.'.cache',$obj,$this->_cacheTime)) {
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                    $this->__destruct();
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                    throw new PHPExcel_Exception('Failed to store cell '.$cellID.' in APC');
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                }
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            }
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        }
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        $this->_cachePrefix = $newCachePrefix;
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    }    //    function copyCellCollection()
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    /**
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     * Clear the cell collection and disconnect from our parent
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     *
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     * @return  void
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     */
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    public function unsetWorksheetCells() {
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        if ($this->_currentObject !== NULL) {
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            $this->_currentObject->detach();
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            $this->_currentObject = $this->_currentObjectID = null;
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        }
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        //    Flush the APC cache
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        $this->__destruct();
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        $this->_cellCache = array();
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        //    detach ourself from the worksheet, so that it can then delete this object successfully
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        $this->_parent = null;
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    }    //    function unsetWorksheetCells()
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    /**
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     * Initialise this new cell collection
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     *
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     * @param  PHPExcel_Worksheet  $parent     The worksheet for this cell collection
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     * @param  array of mixed      $arguments  Additional initialisation arguments
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     */
254
    public function __construct(PHPExcel_Worksheet $parent, $arguments) {
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        $cacheTime = (isset($arguments['cacheTime'])) ? $arguments['cacheTime'] : 600;
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257
        if ($this->_cachePrefix === NULL) {
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            $baseUnique = $this->_getUniqueID();
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            $this->_cachePrefix = substr(md5($baseUnique),0,8).'.';
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            $this->_cacheTime = $cacheTime;
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262
            parent::__construct($parent);
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        }
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    }    //    function __construct()
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    /**
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     * Destroy this cell collection
269
     */
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    public function __destruct() {
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        $cacheList = $this->getCellList();
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        foreach($cacheList as $cellID) {
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            apc_delete($this->_cachePrefix.$cellID.'.cache');
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        }
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    }    //    function __destruct()
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    /**
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     * Identify whether the caching method is currently available
280
     * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
281
     *
282
     * @return  boolean
283
     */
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    public static function cacheMethodIsAvailable() {
285
        if (!function_exists('apc_store')) {
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            return FALSE;
287
        }
288
        if (apc_sma_info() === FALSE) {
289
            return FALSE;
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        }
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        return TRUE;
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    }
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}