File "PHPTemp.php"

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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_PHPTemp
 *
 * @category   PHPExcel
 * @package    PHPExcel_CachedObjectStorage
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_CachedObjectStorage_PHPTemp extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {

    /**
     * Name of the file for this cache
     *
     * @var string
     */
    private $_fileHandle = null;

    /**
     * Memory limit to use before reverting to file cache
     *
     * @var integer
     */
    private $_memoryCacheSize = null;

    /**
     * Store cell data in cache for the current cell object if it's "dirty",
     *     and the 'nullify' the current cell object
     *
     * @return	void
     * @throws	PHPExcel_Exception
     */
    protected function _storeData() {
        if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
            $this->_currentObject->detach();

            fseek($this->_fileHandle, 0, SEEK_END);
            $offset = ftell($this->_fileHandle);
            fwrite($this->_fileHandle, serialize($this->_currentObject));
            $this->_cellCache[$this->_currentObjectID] = array('ptr' => $offset,
                'sz' => ftell($this->_fileHandle) - $offset
            );
            $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	$cell		Cell to update
     * @return	void
     * @throws	PHPExcel_Exception
     */
    public function addCacheData($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 			$pCoord		Coordinate of the cell
     * @throws 	PHPExcel_Exception
     * @return 	PHPExcel_Cell 	Cell that was found, or null if not found
     */
    public function getCacheData($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 = $pCoord;
        fseek($this->_fileHandle, $this->_cellCache[$pCoord]['ptr']);
        $this->_currentObject = unserialize(fread($this->_fileHandle, $this->_cellCache[$pCoord]['sz']));
        //    Re-attach this as the cell's parent
        $this->_currentObject->attach($this);

        //	Return requested entry
        return $this->_currentObject;
    }

//	function getCacheData()

    /**
     * Get a list of all cell addresses currently held in cache
     *
     * @return  array of string
     */
    public function getCellList() {
        if ($this->_currentObjectID !== null) {
            $this->_storeData();
        }

        return parent::getCellList();
    }

    /**
     * Clone the cell collection
     *
     * @param	PHPExcel_Worksheet	$parent		The new worksheet
     * @return	void
     */
    public function copyCellCollection(PHPExcel_Worksheet $parent) {
        parent::copyCellCollection($parent);
        //	Open a new stream for the cell cache data
        $newFileHandle = fopen('php://temp/maxmemory:' . $this->_memoryCacheSize, 'a+');
        //	Copy the existing cell cache data to the new stream
        fseek($this->_fileHandle, 0);
        while (!feof($this->_fileHandle)) {
            fwrite($newFileHandle, fread($this->_fileHandle, 1024));
        }
        $this->_fileHandle = $newFileHandle;
    }

//	function copyCellCollection()

    /**
     * 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;

        //	Close down the php://temp file
        $this->__destruct();
    }

//	function unsetWorksheetCells()

    /**
     * Initialise this new cell collection
     *
     * @param	PHPExcel_Worksheet	$parent		The worksheet for this cell collection
     * @param	array of mixed		$arguments	Additional initialisation arguments
     */
    public function __construct(PHPExcel_Worksheet $parent, $arguments) {
        $this->_memoryCacheSize = (isset($arguments['memoryCacheSize'])) ? $arguments['memoryCacheSize'] : '1MB';

        parent::__construct($parent);
        if (is_null($this->_fileHandle)) {
            $this->_fileHandle = fopen('php://temp/maxmemory:' . $this->_memoryCacheSize, 'a+');
        }
    }

//	function __construct()

    /**
     * Destroy this cell collection
     */
    public function __destruct() {
        if (!is_null($this->_fileHandle)) {
            fclose($this->_fileHandle);
        }
        $this->_fileHandle = null;
    }

//	function __destruct()
}