<?php

/**

 * PHPExcel

 *

 * Copyright (c) 2006 - 2012 PHPExcel

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 * @category   PHPExcel

 * @package    PHPExcel_CachedObjectStorage

 * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)

 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL

 * @version    1.7.7, 2012-05-19

 */





/**

 * PHPExcel_CachedObjectStorage_MemorySerialized

 *

 * @category   PHPExcel

 * @package    PHPExcel_CachedObjectStorage

 * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)

 */

class PHPExcel_CachedObjectStorage_MemorySerialized extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {



    /**

     * Store cell data in cache for the current cell object if it's "dirty",

     *     and the 'nullify' the current cell object

     *

	 * @return	void

     * @throws	Exception

     */

	private function _storeData() {

		if ($this->_currentCellIsDirty) {

			$this->_currentObject->detach();



			$this->_cellCache[$this->_currentObjectID] = serialize($this->_currentObject);

			$this->_currentCellIsDirty = false;

		}

		$this->_currentObjectID = $this->_currentObject = null;

	}	//	function _storeData()





    /**

     * Add or Update a cell in cache identified by coordinate address

     *

     * @param	string			$pCoord		Coordinate address of the cell to update

     * @param	PHPExcel_Cell	$cell		Cell to update

	 * @return	void

     * @throws	Exception

     */

	public function addCacheData($pCoord, PHPExcel_Cell $cell) {

		if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {

			$this->_storeData();

		}



		$this->_currentObjectID = $pCoord;

		$this->_currentObject = $cell;

		$this->_currentCellIsDirty = true;



		return $cell;

	}	//	function addCacheData()





    /**

     * Get cell at a specific coordinate

     *

     * @param 	string 			$pCoord		Coordinate of the cell

     * @throws 	Exception

     * @return 	PHPExcel_Cell 	Cell that was found, or null if not found

     */

	public function getCacheData($pCoord) {

		if ($pCoord === $this->_currentObjectID) {

			return $this->_currentObject;

		}

		$this->_storeData();



		//	Check if the entry that has been requested actually exists

		if (!isset($this->_cellCache[$pCoord])) {

			//	Return null if requested entry doesn't exist in cache

			return null;

		}



		//	Set current entry to the requested entry

		$this->_currentObjectID = $pCoord;

		$this->_currentObject = unserialize($this->_cellCache[$pCoord]);

		//	Re-attach the parent worksheet

		$this->_currentObject->attach($this->_parent);



		//	Return requested entry

		return $this->_currentObject;

	}	//	function getCacheData()





	/**

	 * Clear the cell collection and disconnect from our parent

	 *

	 * @return	void

	 */

	public function unsetWorksheetCells() {

		if(!is_null($this->_currentObject)) {

			$this->_currentObject->detach();

			$this->_currentObject = $this->_currentObjectID = null;

		}

		$this->_cellCache = array();



		//	detach ourself from the worksheet, so that it can then delete this object successfully

		$this->_parent = null;

	}	//	function unsetWorksheetCells()



}

