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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_PHPTemp
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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_PHPTemp extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
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/**
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* Name of the file for this cache
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*
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* @var string
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*/
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private $_fileHandle = null;
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/**
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* Memory limit to use before reverting to file cache
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*
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* @var integer
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*/
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private $_memoryCacheSize = null;
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/**
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* Store cell data in cache for the current cell object if it's "dirty",
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* and the 'nullify' the current cell object
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*
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* @return void
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* @throws PHPExcel_Exception
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*/
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protected function _storeData() {
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if ($this->_currentCellIsDirty) {
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$this->_currentObject->detach();
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fseek($this->_fileHandle,0,SEEK_END);
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$offset = ftell($this->_fileHandle);
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fwrite($this->_fileHandle, serialize($this->_currentObject));
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$this->_cellCache[$this->_currentObjectID] = array('ptr' => $offset,
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'sz' => ftell($this->_fileHandle) - $offset
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);
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$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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* @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->_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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* Get cell at a specific coordinate
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*
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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 (!isset($this->_cellCache[$pCoord])) {
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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 = $pCoord;
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fseek($this->_fileHandle,$this->_cellCache[$pCoord]['ptr']);
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$this->_currentObject = unserialize(fread($this->_fileHandle,$this->_cellCache[$pCoord]['sz']));
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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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* Clone the cell collection
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*
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* @param PHPExcel_Worksheet $parent The new worksheet
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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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// Open a new stream for the cell cache data
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$newFileHandle = fopen('php://temp/maxmemory:'.$this->_memoryCacheSize,'a+');
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// Copy the existing cell cache data to the new stream
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fseek($this->_fileHandle,0);
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while (!feof($this->_fileHandle)) {
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fwrite($newFileHandle,fread($this->_fileHandle, 1024));
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}
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$this->_fileHandle = $newFileHandle;
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} // function copyCellCollection()
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/**
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* Clear the cell collection and disconnect from our parent
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*
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* @return void
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*/
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public function unsetWorksheetCells() {
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if(!is_null($this->_currentObject)) {
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$this->_currentObject->detach();
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$this->_currentObject = $this->_currentObjectID = null;
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}
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$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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$this->_parent = null;
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// Close down the php://temp file
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$this->__destruct();
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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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*/
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public function __construct(PHPExcel_Worksheet $parent, $arguments) {
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$this->_memoryCacheSize = (isset($arguments['memoryCacheSize'])) ? $arguments['memoryCacheSize'] : '1MB';
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parent::__construct($parent);
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if (is_null($this->_fileHandle)) {
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$this->_fileHandle = fopen('php://temp/maxmemory:'.$this->_memoryCacheSize,'a+');
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}
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} // function __construct()
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/**
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* Destroy this cell collection
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*/
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public function __destruct() {
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if (!is_null($this->_fileHandle)) {
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fclose($this->_fileHandle);
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}
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$this->_fileHandle = null;
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} // function __destruct()
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}
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