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<?php

/**

 * PHPExcel

 *

 * Copyright (c) 2006 - 2014 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 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)

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

 * @version    1.8.0, 2014-03-02

 */





/**

 * PHPExcel_CachedObjectStorage_Memory

 *

 * @category   PHPExcel

 * @package    PHPExcel_CachedObjectStorage

 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)

 */

class PHPExcel_CachedObjectStorage_Memory extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {



    /**

     * Dummy method callable from CacheBase, but unused by Memory cache

     *

	 * @return	void

     */

	protected function _storeData() {

	}	//	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	PHPExcel_Cell

     * @throws	PHPExcel_Exception

     */

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

		$this->_cellCache[$pCoord] = $cell;



		//	Set current entry to the new/updated entry

		$this->_currentObjectID = $pCoord;



		return $cell;

	}	//	function addCacheData()





    /**

     * Get cell at a specific coordinate

     *

     * @param 	string 			$pCoord		Coordinate of the cell

     * @throws 	PHPExcel_Exception

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

     */

	public function getCacheData($pCoord) {

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

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

			$this->_currentObjectID = NULL;

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

			return null;

		}



		//	Set current entry to the requested entry

		$this->_currentObjectID = $pCoord;



		//	Return requested entry

		return $this->_cellCache[$pCoord];

	}	//	function getCacheData()





	/**

	 * Clone the cell collection

	 *

	 * @param	PHPExcel_Worksheet	$parent		The new worksheet

	 * @return	void

	 */

	public function copyCellCollection(PHPExcel_Worksheet $parent) {

		parent::copyCellCollection($parent);



		$newCollection = array();

		foreach($this->_cellCache as $k => &$cell) {

			$newCollection[$k] = clone $cell;

			$newCollection[$k]->attach($this);

		}



		$this->_cellCache = $newCollection;

	}





	/**

	 * Clear the cell collection and disconnect from our parent

	 *

	 * @return	void

	 */

	public function unsetWorksheetCells() {

		//	Because cells are all stored as intact objects in memory, we need to detach each one from the parent

		foreach($this->_cellCache as $k => &$cell) {

			$cell->detach();

			$this->_cellCache[$k] = null;

		}

		unset($cell);



		$this->_cellCache = array();



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

		$this->_parent = null;

	}	//	function unsetWorksheetCells()



}