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<?php
/**
* PHPExcel_CachedObjectStorage_DiscISAM
*
* Copyright (c) 2006 - 2015 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 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version ##VERSION##, ##DATE##
*/
class PHPExcel_CachedObjectStorage_DiscISAM extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache
{
/**
* Name of the file for this cache
*
* @var string
*/
private $fileName = null;
/**
* File handle for this cache file
*
* @var resource
*/
private $fileHandle = null;
/**
* Directory/Folder where the cache file is located
*
* @var string
*/
private $cacheDirectory = null;
/**
* Store cell data in cache for the current cell object if it's "dirty",
* and the 'nullify' the current cell object
*
* @return void
* @throws PHPExcel_Exception
*/
protected function storeData()
{
if ($this->currentCellIsDirty && !empty($this->currentObjectID)) {
$this->currentObject->detach();
fseek($this->fileHandle, 0, SEEK_END);
$this->cellCache[$this->currentObjectID] = array(
'ptr' => ftell($this->fileHandle),
'sz' => fwrite($this->fileHandle, serialize($this->currentObject))
);
$this->currentCellIsDirty = false;
}
$this->currentObjectID = $this->currentObject = null;
}
/**
* 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 $cell)
{
if (($pCoord !== $this->currentObjectID) && ($this->currentObjectID !== null)) {
$this->storeData();
}
$this->currentObjectID = $pCoord;
$this->currentObject = $cell;
$this->currentCellIsDirty = true;
return $cell;
}
/**
* 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 $this->currentObject;
}
/**
* Get a list of all cell addresses currently held in cache
*
* @return string[]
*/
public function getCellList()
{
if ($this->currentObjectID !== null) {
$this->storeData();
}
return parent::getCellList();
}
/**
* Clone the cell collection
*
* @param PHPExcel_Worksheet $parent The new worksheet
*/
public function copyCellCollection(PHPExcel_Worksheet $parent)
{
parent::copyCellCollection($parent);
// Get a new id for the new file name
$baseUnique = $this->getUniqueID();
$newFileName = $this->cacheDirectory.'/PHPExcel.'.$baseUnique.'.cache';
// Copy the existing cell cache file
copy($this->fileName, $newFileName);
$this->fileName = $newFileName;
// Open the copied cell cache file
$this->fileHandle = fopen($this->fileName, 'a+');
}
/**
* Clear the cell collection and disconnect from our parent
*
*/
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 temporary cache file
$this->__destruct();
}
/**
* 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)
{
$this->cacheDirectory = ((isset($arguments['dir'])) && ($arguments['dir'] !== null))
? $arguments['dir']
: PHPExcel_Shared_File::sys_get_temp_dir();
parent::__construct($parent);
if (is_null($this->fileHandle)) {
$baseUnique = $this->getUniqueID();
$this->fileName = $this->cacheDirectory.'/PHPExcel.'.$baseUnique.'.cache';
$this->fileHandle = fopen($this->fileName, 'a+');
}
}
/**
* Destroy this cell collection
*/
public function __destruct()
{
if (!is_null($this->fileHandle)) {
fclose($this->fileHandle);
unlink($this->fileName);
}
$this->fileHandle = null;
}
}
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