author: Anton Luka Šijanec <anton@sijanec.eu> 2022-01-11 12:35:47 +0100
committer: Anton Luka Šijanec <anton@sijanec.eu> 2022-01-11 12:35:47 +0100
commit: 19985dbb8c0aa66dc4bf7905abc1148de909097d (patch)
tree: 2cd5a5d20d7e80fc2a51adf60d838d8a2c40999e /admin/survey/excel/PHPExcel/CachedObjectStorage
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14 files changed, 2898 insertions, 0 deletions
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/APC.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/APC.php
new file mode 100644
index 0000000..cda4d3b
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/APC.php
@@ -0,0 +1,280 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_APC
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	/**
+	 * Prefix used to uniquely identify cache data for this worksheet
+	 *
+	 * @access	private
+	 * @var string
+	 */
+	private $_cachePrefix = null;
+
+	/**
+	 * Cache timeout
+	 *
+	 * @access	private
+	 * @var integer
+	 */
+	private $_cacheTime = 600;
+
+
+    /**
+     * Store cell data in cache for the current cell object if it's "dirty",
+     *     and the 'nullify' the current cell object
+     *
+	 * @access	private
+	 * @return	void
+     * @throws	Exception
+     */
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			if (!apc_store($this->_cachePrefix.$this->_currentObjectID.'.cache',serialize($this->_currentObject),$this->_cacheTime)) {
+				$this->__destruct();
+				throw new Exception('Failed to store cell '.$this->_currentObjectID.' in APC');
+			}
+			$this->_currentCellIsDirty = false;
+		}
+		$this->_currentObjectID = $this->_currentObject = null;
+	}	//	function _storeData()
+
+
+    /**
+     * Add or Update a cell in cache identified by coordinate address
+     *
+	 * @access	public
+     * @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();
+		}
+		$this->_cellCache[$pCoord] = true;
+
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = $cell;
+		$this->_currentCellIsDirty = true;
+
+		return $cell;
+	}	//	function addCacheData()
+
+
+	/**
+	 * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
+	 *
+	 * @access	public
+	 * @param	string		$pCoord		Coordinate address of the cell to check
+	 * @return	void
+	 * @return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		//	Check if the requested entry is the current object, or exists in the cache
+		if (parent::isDataSet($pCoord)) {
+			if ($this->_currentObjectID == $pCoord) {
+				return true;
+			}
+			//	Check if the requested entry still exists in apc
+			$success = apc_fetch($this->_cachePrefix.$pCoord.'.cache');
+			if ($success === false) {
+				//	Entry no longer exists in APC, so clear it from the cache array
+				parent::deleteCacheData($pCoord);
+				throw new Exception('Cell entry '.$pCoord.' no longer exists in APC');
+			}
+			return true;
+		}
+		return false;
+	}	//	function isDataSet()
+
+
+    /**
+     * Get cell at a specific coordinate
+     *
+	 * @access	public
+     * @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;
+		}
+		$this->_storeData();
+
+		//	Check if the entry that has been requested actually exists
+		if (parent::isDataSet($pCoord)) {
+			$obj = apc_fetch($this->_cachePrefix.$pCoord.'.cache');
+			if ($obj === false) {
+				//	Entry no longer exists in APC, so clear it from the cache array
+				parent::deleteCacheData($pCoord);
+				throw new Exception('Cell entry '.$pCoord.' no longer exists in APC');
+			}
+		} else {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = unserialize($obj);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+    /**
+     * Delete a cell in cache identified by coordinate address
+     *
+	 * @access	public
+     * @param	string			$pCoord		Coordinate address of the cell to delete
+     * @throws	Exception
+     */
+	public function deleteCacheData($pCoord) {
+		//	Delete the entry from APC
+		apc_delete($this->_cachePrefix.$pCoord.'.cache');
+
+		//	Delete the entry from our cell address array
+		parent::deleteCacheData($pCoord);
+	}	//	function deleteCacheData()
+
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @access	public
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		parent::copyCellCollection($parent);
+		//	Get a new id for the new file name
+		$baseUnique = $this->_getUniqueID();
+		$newCachePrefix = substr(md5($baseUnique),0,8).'.';
+		$cacheList = $this->getCellList();
+		foreach($cacheList as $cellID) {
+			if ($cellID != $this->_currentObjectID) {
+				$obj = apc_fetch($this->_cachePrefix.$cellID.'.cache');
+				if ($obj === false) {
+					//	Entry no longer exists in APC, so clear it from the cache array
+					parent::deleteCacheData($cellID);
+					throw new Exception('Cell entry '.$cellID.' no longer exists in APC');
+				}
+				if (!apc_store($newCachePrefix.$cellID.'.cache',$obj,$this->_cacheTime)) {
+					$this->__destruct();
+					throw new Exception('Failed to store cell '.$cellID.' in APC');
+				}
+			}
+		}
+		$this->_cachePrefix = $newCachePrefix;
+	}	//	function copyCellCollection()
+
+
+	/**
+	 * Clear the cell collection and disconnect from our parent
+	 *
+	 * @return	void
+	 */
+	public function unsetWorksheetCells() {
+		if ($this->_currentObject !== NULL) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+
+		//	Flush the APC cache
+		$this->__destruct();
+
+		$this->_cellCache = array();
+
+		//	detach ourself from the worksheet, so that it can then delete this object successfully
+		$this->_parent = null;
+	}	//	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) {
+		$cacheTime	= (isset($arguments['cacheTime']))	? $arguments['cacheTime']	: 600;
+
+		if ($this->_cachePrefix === NULL) {
+			$baseUnique = $this->_getUniqueID();
+			$this->_cachePrefix = substr(md5($baseUnique),0,8).'.';
+			$this->_cacheTime = $cacheTime;
+
+			parent::__construct($parent);
+		}
+	}	//	function __construct()
+
+
+	/**
+	 * Destroy this cell collection
+	 */
+	public function __destruct() {
+		$cacheList = $this->getCellList();
+		foreach($cacheList as $cellID) {
+			apc_delete($this->_cachePrefix.$cellID.'.cache');
+		}
+	}	//	function __destruct()
+
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable() {
+		if (!function_exists('apc_store')) {
+			return false;
+		}
+		if (apc_sma_info() === false) {
+			return false;
+		}
+
+		return true;
+	}
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/CacheBase.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/CacheBase.php
new file mode 100644
index 0000000..deaae4c
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/CacheBase.php
@@ -0,0 +1,252 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_CacheBase
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+abstract class PHPExcel_CachedObjectStorage_CacheBase {
+
+	/**
+	 * Parent worksheet
+	 *
+	 * @var PHPExcel_Worksheet
+	 */
+	protected $_parent;
+
+	/**
+	 * The currently active Cell
+	 *
+	 * @var PHPExcel_Cell
+	 */
+	protected $_currentObject = null;
+
+	/**
+	 * Coordinate address of the currently active Cell
+	 *
+	 * @var string
+	 */
+	protected $_currentObjectID = null;
+
+
+	/**
+	 * Flag indicating whether the currently active Cell requires saving
+	 *
+	 * @var boolean
+	 */
+	protected $_currentCellIsDirty = true;
+
+	/**
+	 * An array of cells or cell pointers for the worksheet cells held in this cache,
+	 *		and indexed by their coordinate address within the worksheet
+	 *
+	 * @var array of mixed
+	 */
+	protected $_cellCache = array();
+
+
+	/**
+	 * Initialise this new cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The worksheet for this cell collection
+	 */
+	public function __construct(PHPExcel_Worksheet $parent) {
+		//	Set our parent worksheet.
+		//	This is maintained within the cache controller to facilitate re-attaching it to PHPExcel_Cell objects when
+		//		they are woken from a serialized state
+		$this->_parent = $parent;
+	}	//	function __construct()
+
+
+	/**
+	 * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
+	 *
+	 * @param	string		$pCoord		Coordinate address of the cell to check
+	 * @return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return true;
+		}
+		//	Check if the requested entry exists in the cache
+		return isset($this->_cellCache[$pCoord]);
+	}	//	function isDataSet()
+
+
+    /**
+     * Add or Update a cell in cache
+     *
+     * @param	PHPExcel_Cell	$cell		Cell to update
+	 * @return	void
+     * @throws	Exception
+     */
+	public function updateCacheData(PHPExcel_Cell $cell) {
+		return $this->addCacheData($cell->getCoordinate(),$cell);
+	}	//	function updateCacheData()
+
+
+    /**
+     * Delete a cell in cache identified by coordinate address
+     *
+     * @param	string			$pCoord		Coordinate address of the cell to delete
+     * @throws	Exception
+     */
+	public function deleteCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			$this->_currentObject->detach();
+			$this->_currentObjectID = $this->_currentObject = null;
+		}
+
+		if (is_object($this->_cellCache[$pCoord])) {
+			$this->_cellCache[$pCoord]->detach();
+			unset($this->_cellCache[$pCoord]);
+		}
+		$this->_currentCellIsDirty = false;
+	}	//	function deleteCacheData()
+
+
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return	array of string
+	 */
+	public function getCellList() {
+		return array_keys($this->_cellCache);
+	}	//	function getCellList()
+
+
+	/**
+	 * Sort the list of all cell addresses currently held in cache by row and column
+	 *
+	 * @return	void
+	 */
+	public function getSortedCellList() {
+		$sortKeys = array();
+		foreach ($this->getCellList() as $coord) {
+			list($column,$row) = sscanf($coord,'%[A-Z]%d');
+			$sortKeys[sprintf('%09d%3s',$row,$column)] = $coord;
+		}
+		ksort($sortKeys);
+
+		return array_values($sortKeys);
+	}	//	function sortCellList()
+
+
+
+	/**
+	 * Get highest worksheet column and highest row that have cell records
+	 *
+	 * @return array Highest column name and highest row number
+	 */
+	public function getHighestRowAndColumn()
+	{
+		// Lookup highest column and highest row
+		$col = array('A' => '1A');
+		$row = array(1);
+		foreach ($this->getCellList() as $coord) {
+			list($c,$r) = sscanf($coord,'%[A-Z]%d');
+			$row[$r] = $r;
+			$col[$c] = strlen($c).$c;
+		}
+		if (!empty($row)) {
+			// Determine highest column and row
+			$highestRow = max($row);
+			$highestColumn = substr(max($col),1);
+		}
+
+		return array( 'row'	   => $highestRow,
+					  'column' => $highestColumn
+					);
+	}
+
+
+	/**
+	 * Get highest worksheet column
+	 *
+	 * @return string Highest column name
+	 */
+	public function getHighestColumn()
+	{
+		$colRow = $this->getHighestRowAndColumn();
+		return $colRow['column'];
+	}
+
+	/**
+	 * Get highest worksheet row
+	 *
+	 * @return int Highest row number
+	 */
+	public function getHighestRow()
+	{
+		$colRow = $this->getHighestRowAndColumn();
+		return $colRow['row'];
+	}
+
+
+	/**
+	 * Generate a unique ID for cache referencing
+	 *
+	 * @return string Unique Reference
+	 */
+	protected function _getUniqueID() {
+		if (function_exists('posix_getpid')) {
+			$baseUnique = posix_getpid();
+		} else {
+			$baseUnique = mt_rand();
+		}
+		return uniqid($baseUnique,true);
+	}
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		$this->_parent = $parent;
+		if (($this->_currentObject !== NULL) && (is_object($this->_currentObject))) {
+			$this->_currentObject->attach($parent);
+		}
+	}	//	function copyCellCollection()
+
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable() {
+		return true;
+	}
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/DiscISAM.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/DiscISAM.php
new file mode 100644
index 0000000..d93ab05
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/DiscISAM.php
@@ -0,0 +1,205 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_DiscISAM
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+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 $_cacheDirectory = NULL;
+
+
+    /**
+     * Store cell data in cache for the current cell object if it's "dirty",
+     *     and the 'nullify' the current cell object
+     *
+	 * @return	void
+     * @throws	Exception
+     */
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			fseek($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	$cell		Cell to update
+	 * @return	void
+     * @throws	Exception
+     */
+	public function addCacheData($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 = $pCoord;
+		fseek($this->_fileHandle,$this->_cellCache[$pCoord]['ptr']);
+		$this->_currentObject = unserialize(fread($this->_fileHandle,$this->_cellCache[$pCoord]['sz']));
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	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+');
+	}	//	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 temporary cache 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) {
+		$this->_cacheDirectory	= ((isset($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+');
+		}
+	}	//	function __construct()
+
+
+	/**
+	 * Destroy this cell collection
+	 */
+	public function __destruct() {
+		if (!is_null($this->_fileHandle)) {
+			fclose($this->_fileHandle);
+			unlink($this->_fileName);
+		}
+		$this->_fileHandle = null;
+	}	//	function __destruct()
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/ICache.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/ICache.php
new file mode 100644
index 0000000..fd35e87
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/ICache.php
@@ -0,0 +1,112 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_ICache
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+interface PHPExcel_CachedObjectStorage_ICache
+{
+    /**
+     * 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);
+
+    /**
+     * Add or Update a cell in cache
+     *
+     * @param	PHPExcel_Cell	$cell		Cell to update
+	 * @return	void
+     * @throws	Exception
+     */
+	public function updateCacheData(PHPExcel_Cell $cell);
+
+    /**
+     * Fetch a cell from cache identified by coordinate address
+     *
+     * @param	string			$pCoord		Coordinate address of the cell to retrieve
+     * @return PHPExcel_Cell 	Cell that was found, or null if not found
+     * @throws	Exception
+     */
+	public function getCacheData($pCoord);
+
+    /**
+     * Delete a cell in cache identified by coordinate address
+     *
+     * @param	string			$pCoord		Coordinate address of the cell to delete
+     * @throws	Exception
+     */
+	public function deleteCacheData($pCoord);
+
+	/**
+	 * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
+	 *
+	 * @param	string		$pCoord		Coordinate address of the cell to check
+	 * @return	boolean
+	 */
+	public function isDataSet($pCoord);
+
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return	array of string
+	 */
+	public function getCellList();
+
+	/**
+	 * Get the list of all cell addresses currently held in cache sorted by column and row
+	 *
+	 * @return	void
+	 */
+	public function getSortedCellList();
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent);
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable();
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/Igbinary.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/Igbinary.php
new file mode 100644
index 0000000..5d5daf4
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/Igbinary.php
@@ -0,0 +1,138 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_Igbinary
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_Igbinary 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] = igbinary_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;
+		$this->_currentObject = igbinary_unserialize($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()
+
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable() {
+		if (!function_exists('igbinary_serialize')) {
+			return false;
+		}
+
+		return true;
+	}
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/Memcache.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/Memcache.php
new file mode 100644
index 0000000..3e5fcb4
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/Memcache.php
@@ -0,0 +1,298 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_Memcache
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_Memcache extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	/**
+	 * Prefix used to uniquely identify cache data for this worksheet
+	 *
+	 * @var string
+	 */
+	private $_cachePrefix = null;
+
+	/**
+	 * Cache timeout
+	 *
+	 * @var integer
+	 */
+	private $_cacheTime = 600;
+
+	/**
+	 * Memcache interface
+	 *
+	 * @var resource
+	 */
+	private $_memcache = null;
+
+
+    /**
+     * Store cell data in cache for the current cell object if it's "dirty",
+     *     and the 'nullify' the current cell object
+     *
+	 * @return	void
+     * @throws	Exception
+     */
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			$obj = serialize($this->_currentObject);
+			if (!$this->_memcache->replace($this->_cachePrefix.$this->_currentObjectID.'.cache',$obj,NULL,$this->_cacheTime)) {
+				if (!$this->_memcache->add($this->_cachePrefix.$this->_currentObjectID.'.cache',$obj,NULL,$this->_cacheTime)) {
+					$this->__destruct();
+					throw new Exception('Failed to store cell '.$this->_currentObjectID.' in MemCache');
+				}
+			}
+			$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();
+		}
+		$this->_cellCache[$pCoord] = true;
+
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = $cell;
+		$this->_currentCellIsDirty = true;
+
+		return $cell;
+	}	//	function addCacheData()
+
+
+	/**
+	 * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
+	 *
+	 * @param	string		$pCoord		Coordinate address of the cell to check
+	 * @return	void
+	 * @return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		//	Check if the requested entry is the current object, or exists in the cache
+		if (parent::isDataSet($pCoord)) {
+			if ($this->_currentObjectID == $pCoord) {
+				return true;
+			}
+			//	Check if the requested entry still exists in Memcache
+			$success = $this->_memcache->get($this->_cachePrefix.$pCoord.'.cache');
+			if ($success === false) {
+				//	Entry no longer exists in Memcache, so clear it from the cache array
+				parent::deleteCacheData($pCoord);
+				throw new Exception('Cell entry '.$pCoord.' no longer exists in MemCache');
+			}
+			return true;
+		}
+		return false;
+	}	//	function isDataSet()
+
+
+	/**
+     * 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;
+		}
+		$this->_storeData();
+
+		//	Check if the entry that has been requested actually exists
+		if (parent::isDataSet($pCoord)) {
+			$obj = $this->_memcache->get($this->_cachePrefix.$pCoord.'.cache');
+			if ($obj === false) {
+				//	Entry no longer exists in Memcache, so clear it from the cache array
+				parent::deleteCacheData($pCoord);
+				throw new Exception('Cell entry '.$pCoord.' no longer exists in MemCache');
+			}
+		} else {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = unserialize($obj);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+    /**
+     * Delete a cell in cache identified by coordinate address
+     *
+     * @param	string			$pCoord		Coordinate address of the cell to delete
+     * @throws	Exception
+     */
+	public function deleteCacheData($pCoord) {
+		//	Delete the entry from Memcache
+		$this->_memcache->delete($this->_cachePrefix.$pCoord.'.cache');
+
+		//	Delete the entry from our cell address array
+		parent::deleteCacheData($pCoord);
+	}	//	function deleteCacheData()
+
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		parent::copyCellCollection($parent);
+		//	Get a new id for the new file name
+		$baseUnique = $this->_getUniqueID();
+		$newCachePrefix = substr(md5($baseUnique),0,8).'.';
+		$cacheList = $this->getCellList();
+		foreach($cacheList as $cellID) {
+			if ($cellID != $this->_currentObjectID) {
+				$obj = $this->_memcache->get($this->_cachePrefix.$cellID.'.cache');
+				if ($obj === false) {
+					//	Entry no longer exists in Memcache, so clear it from the cache array
+					parent::deleteCacheData($cellID);
+					throw new Exception('Cell entry '.$cellID.' no longer exists in MemCache');
+				}
+				if (!$this->_memcache->add($newCachePrefix.$cellID.'.cache',$obj,NULL,$this->_cacheTime)) {
+					$this->__destruct();
+					throw new Exception('Failed to store cell '.$cellID.' in MemCache');
+				}
+			}
+		}
+		$this->_cachePrefix = $newCachePrefix;
+	}	//	function copyCellCollection()
+
+
+	/**
+	 * Clear the cell collection and disconnect from our parent
+	 *
+	 * @return	void
+	 */
+	public function unsetWorksheetCells() {
+		if(!is_null($this->_currentObject)) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+
+		//	Flush the Memcache cache
+		$this->__destruct();
+
+		$this->_cellCache = array();
+
+		//	detach ourself from the worksheet, so that it can then delete this object successfully
+		$this->_parent = null;
+	}	//	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) {
+		$memcacheServer	= (isset($arguments['memcacheServer']))	? $arguments['memcacheServer']	: 'localhost';
+		$memcachePort	= (isset($arguments['memcachePort']))	? $arguments['memcachePort']	: 11211;
+		$cacheTime		= (isset($arguments['cacheTime']))		? $arguments['cacheTime']		: 600;
+
+		if (is_null($this->_cachePrefix)) {
+			$baseUnique = $this->_getUniqueID();
+			$this->_cachePrefix = substr(md5($baseUnique),0,8).'.';
+
+			//	Set a new Memcache object and connect to the Memcache server
+			$this->_memcache = new Memcache();
+			if (!$this->_memcache->addServer($memcacheServer, $memcachePort, false, 50, 5, 5, true, array($this, 'failureCallback'))) {
+				throw new Exception('Could not connect to MemCache server at '.$memcacheServer.':'.$memcachePort);
+			}
+			$this->_cacheTime = $cacheTime;
+
+			parent::__construct($parent);
+		}
+	}	//	function __construct()
+
+
+	/**
+	 * Memcache error handler
+	 *
+	 * @param	string	$host		Memcache server
+	 * @param	integer	$port		Memcache port
+     * @throws	Exception
+	 */
+	public function failureCallback($host, $port) {
+		throw new Exception('memcache '.$host.':'.$port.' failed');
+	}
+
+
+	/**
+	 * Destroy this cell collection
+	 */
+	public function __destruct() {
+		$cacheList = $this->getCellList();
+		foreach($cacheList as $cellID) {
+			$this->_memcache->delete($this->_cachePrefix.$cellID.'.cache');
+		}
+	}	//	function __destruct()
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable() {
+		if (!function_exists('memcache_add')) {
+			return false;
+		}
+
+		return true;
+	}
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/Memory.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/Memory.php
new file mode 100644
index 0000000..f368e39
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/Memory.php
@@ -0,0 +1,109 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_Memory
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_Memory extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+    /**
+     * 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) {
+		$this->_cellCache[$pCoord] = $cell;
+		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) {
+		//	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;
+		}
+
+		//	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($parent);
+		}
+
+		$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()
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/MemoryGZip.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/MemoryGZip.php
new file mode 100644
index 0000000..6941231
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/MemoryGZip.php
@@ -0,0 +1,123 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_MemoryGZip
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_MemoryGZip 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] = gzdeflate(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;
+		$this->_currentObject = unserialize(gzinflate($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()
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/MemorySerialized.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/MemorySerialized.php
new file mode 100644
index 0000000..09f3b66
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/MemorySerialized.php
@@ -0,0 +1,123 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * 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()
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/PHPTemp.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/PHPTemp.php
new file mode 100644
index 0000000..c3f2bd9
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/PHPTemp.php
@@ -0,0 +1,192 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_PHPTemp
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 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 $_memoryCacheSize = null;
+
+    /**
+     * Store cell data in cache for the current cell object if it's "dirty",
+     *     and the 'nullify' the current cell object
+     *
+	 * @return	void
+     * @throws	Exception
+     */
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			fseek($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	$cell		Cell to update
+	 * @return	void
+     * @throws	Exception
+     */
+	public function addCacheData($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 = $pCoord;
+		fseek($this->_fileHandle,$this->_cellCache[$pCoord]['ptr']);
+		$this->_currentObject = unserialize(fread($this->_fileHandle,$this->_cellCache[$pCoord]['sz']));
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	/**
+	 * 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()
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/SQLite.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/SQLite.php
new file mode 100644
index 0000000..515573d
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/SQLite.php
@@ -0,0 +1,270 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_SQLite
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	/**
+	 * Database table name
+	 *
+	 * @var string
+	 */
+	private $_TableName = null;
+
+	/**
+	 * Database handle
+	 *
+	 * @var resource
+	 */
+	private $_DBHandle = null;
+
+    /**
+     * Store cell data in cache for the current cell object if it's "dirty",
+     *     and the 'nullify' the current cell object
+     *
+	 * @return	void
+     * @throws	Exception
+     */
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			if (!$this->_DBHandle->queryExec("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES('".$this->_currentObjectID."','".sqlite_escape_string(serialize($this->_currentObject))."')"))
+				throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+			$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();
+
+		$query = "SELECT value FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResultSet = $this->_DBHandle->query($query,SQLITE_ASSOC);
+		if ($cellResultSet === false) {
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+		} elseif ($cellResultSet->numRows() == 0) {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+
+		$cellResult = $cellResultSet->fetchSingle();
+		$this->_currentObject = unserialize($cellResult);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	/**
+	 * Is a value set for an indexed cell?
+	 *
+	 * @param	string		$pCoord		Coordinate address of the cell to check
+	 * @return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return true;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "SELECT id FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResultSet = $this->_DBHandle->query($query,SQLITE_ASSOC);
+		if ($cellResultSet === false) {
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+		} elseif ($cellResultSet->numRows() == 0) {
+			//	Return null if requested entry doesn't exist in cache
+			return false;
+		}
+		return true;
+	}	//	function isDataSet()
+
+
+    /**
+     * Delete a cell in cache identified by coordinate address
+     *
+     * @param	string			$pCoord		Coordinate address of the cell to delete
+     * @throws	Exception
+     */
+	public function deleteCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			$this->_currentObject->detach();
+			$this->_currentObjectID = $this->_currentObject = null;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "DELETE FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		if (!$this->_DBHandle->queryExec($query))
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+
+		$this->_currentCellIsDirty = false;
+	}	//	function deleteCacheData()
+
+
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return	array of string
+	 */
+	public function getCellList() {
+		$query = "SELECT id FROM kvp_".$this->_TableName;
+		$cellIdsResult = $this->_DBHandle->unbufferedQuery($query,SQLITE_ASSOC);
+		if ($cellIdsResult === false)
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+
+		$cellKeys = array();
+		foreach($cellIdsResult as $row) {
+			$cellKeys[] = $row['id'];
+		}
+
+		return $cellKeys;
+	}	//	function getCellList()
+
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		//	Get a new id for the new table name
+		$tableName = str_replace('.','_',$this->_getUniqueID());
+		if (!$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
+													AS SELECT * FROM kvp_'.$this->_TableName))
+			throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+
+		//	Copy the existing cell cache file
+		$this->_TableName = $tableName;
+	}	//	function copyCellCollection()
+
+
+	/**
+	 * Clear the cell collection and disconnect from our parent
+	 *
+	 * @return	void
+	 */
+	public function unsetWorksheetCells() {
+		if(!is_null($this->_currentObject)) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+		//	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();
+	}	//	function unsetWorksheetCells()
+
+
+	/**
+	 * Initialise this new cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The worksheet for this cell collection
+	 */
+	public function __construct(PHPExcel_Worksheet $parent) {
+		parent::__construct($parent);
+		if (is_null($this->_DBHandle)) {
+			$this->_TableName = str_replace('.','_',$this->_getUniqueID());
+			$_DBName = ':memory:';
+
+			$this->_DBHandle = new SQLiteDatabase($_DBName);
+			if ($this->_DBHandle === false)
+				throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+			if (!$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$this->_TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)'))
+				throw new Exception(sqlite_error_string($this->_DBHandle->lastError()));
+		}
+	}	//	function __construct()
+
+
+	/**
+	 * Destroy this cell collection
+	 */
+	public function __destruct() {
+		$this->_DBHandle = null;
+	}	//	function __destruct()
+
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable() {
+		if (!function_exists('sqlite_open')) {
+			return false;
+		}
+
+		return true;
+	}
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/SQLite3.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/SQLite3.php
new file mode 100644
index 0000000..b867b4d
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/SQLite3.php
@@ -0,0 +1,277 @@
+<?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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_SQLite3
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	/**
+	 * Database table name
+	 *
+	 * @var string
+	 */
+	private $_TableName = null;
+
+	/**
+	 * Database handle
+	 *
+	 * @var resource
+	 */
+	private $_DBHandle = null;
+
+    /**
+     * Store cell data in cache for the current cell object if it's "dirty",
+     *     and the 'nullify' the current cell object
+     *
+	 * @return	void
+     * @throws	Exception
+     */
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			$query = $this->_DBHandle->prepare("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES(:id,:data)");
+			$query->bindValue('id',$this->_currentObjectID,SQLITE3_TEXT);
+			$query->bindValue('data',serialize($this->_currentObject),SQLITE3_BLOB);
+			$result = $query->execute();
+			if ($result === false)
+				throw new Exception($this->_DBHandle->lastErrorMsg());
+			$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();
+
+		$query = "SELECT value FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResult = $this->_DBHandle->querySingle($query);
+		if ($cellResult === false) {
+			throw new Exception($this->_DBHandle->lastErrorMsg());
+		} elseif (is_null($cellResult)) {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+
+		$this->_currentObject = unserialize($cellResult);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	/**
+	 *	Is a value set for an indexed cell?
+	 *
+	 * @param	string		$pCoord		Coordinate address of the cell to check
+	 * @return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return true;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "SELECT id FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResult = $this->_DBHandle->querySingle($query);
+		if ($cellResult === false) {
+			throw new Exception($this->_DBHandle->lastErrorMsg());
+		} elseif (is_null($cellResult)) {
+			//	Return null if requested entry doesn't exist in cache
+			return false;
+		}
+		return true;
+	}	//	function isDataSet()
+
+
+    /**
+     *	Delete a cell in cache identified by coordinate address
+     *
+     * @param	string			$pCoord		Coordinate address of the cell to delete
+     * @throws	Exception
+     */
+	public function deleteCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			$this->_currentObject->detach();
+			$this->_currentObjectID = $this->_currentObject = null;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "DELETE FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$result = $this->_DBHandle->exec($query);
+		if ($result === false)
+			throw new Exception($this->_DBHandle->lastErrorMsg());
+
+		$this->_currentCellIsDirty = false;
+	}	//	function deleteCacheData()
+
+
+	/**
+	 * Get a list of all cell addresses currently held in cache
+	 *
+	 * @return	array of string
+	 */
+	public function getCellList() {
+		$query = "SELECT id FROM kvp_".$this->_TableName;
+		$cellIdsResult = $this->_DBHandle->query($query);
+		if ($cellIdsResult === false)
+			throw new Exception($this->_DBHandle->lastErrorMsg());
+
+		$cellKeys = array();
+		while ($row = $cellIdsResult->fetchArray(SQLITE3_ASSOC)) {
+			$cellKeys[] = $row['id'];
+		}
+
+		return $cellKeys;
+	}	//	function getCellList()
+
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		//	Get a new id for the new table name
+		$tableName = str_replace('.','_',$this->_getUniqueID());
+		if (!$this->_DBHandle->exec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
+		                                       AS SELECT * FROM kvp_'.$this->_TableName))
+			throw new Exception($this->_DBHandle->lastErrorMsg());
+
+		//	Copy the existing cell cache file
+		$this->_TableName = $tableName;
+	}	//	function copyCellCollection()
+
+
+	/**
+	 * Clear the cell collection and disconnect from our parent
+	 *
+	 * @return	void
+	 */
+	public function unsetWorksheetCells() {
+		if(!is_null($this->_currentObject)) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+		//	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();
+	}	//	function unsetWorksheetCells()
+
+
+	/**
+	 * Initialise this new cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The worksheet for this cell collection
+	 */
+	public function __construct(PHPExcel_Worksheet $parent) {
+		parent::__construct($parent);
+		if (is_null($this->_DBHandle)) {
+			$this->_TableName = str_replace('.','_',$this->_getUniqueID());
+			$_DBName = ':memory:';
+
+			$this->_DBHandle = new SQLite3($_DBName);
+			if ($this->_DBHandle === false)
+				throw new Exception($this->_DBHandle->lastErrorMsg());
+			if (!$this->_DBHandle->exec('CREATE TABLE kvp_'.$this->_TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)'))
+				throw new Exception($this->_DBHandle->lastErrorMsg());
+		}
+	}	//	function __construct()
+
+
+	/**
+	 * Destroy this cell collection
+	 */
+	public function __destruct() {
+		if (!is_null($this->_DBHandle)) {
+			$this->_DBHandle->close();
+		}
+		$this->_DBHandle = null;
+	}	//	function __destruct()
+
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable() {
+		if (!class_exists('SQLite3',FALSE)) {
+			return false;
+		}
+
+		return true;
+	}
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorage/Wincache.php b/admin/survey/excel/PHPExcel/CachedObjectStorage/Wincache.php
new file mode 100644
index 0000000..1534448
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorage/Wincache.php
@@ -0,0 +1,280 @@
+<?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	1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_Wincache
+ *
+ * @category   PHPExcel
+ * @package	PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_Wincache extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	/**
+	 * Prefix used to uniquely identify cache data for this worksheet
+	 *
+	 * @var string
+	 */
+	private $_cachePrefix = null;
+
+	/**
+	 * Cache timeout
+	 *
+	 * @var integer
+	 */
+	private $_cacheTime = 600;
+
+
+    /**
+     * Store cell data in cache for the current cell object if it's "dirty",
+     *     and the 'nullify' the current cell object
+     *
+	 * @return	void
+     * @throws	Exception
+     */
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			$obj = serialize($this->_currentObject);
+			if (wincache_ucache_exists($this->_cachePrefix.$this->_currentObjectID.'.cache')) {
+				if (!wincache_ucache_set($this->_cachePrefix.$this->_currentObjectID.'.cache', $obj, $this->_cacheTime)) {
+					$this->__destruct();
+					throw new Exception('Failed to store cell '.$this->_currentObjectID.' in WinCache');
+				}
+			} else {
+				if (!wincache_ucache_add($this->_cachePrefix.$this->_currentObjectID.'.cache', $obj, $this->_cacheTime)) {
+					$this->__destruct();
+					throw new Exception('Failed to store cell '.$this->_currentObjectID.' in WinCache');
+				}
+			}
+			$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();
+		}
+		$this->_cellCache[$pCoord] = true;
+
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = $cell;
+		$this->_currentCellIsDirty = true;
+
+		return $cell;
+	}	//	function addCacheData()
+
+
+	/**
+	 * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
+	 *
+	 * @param	string		$pCoord		Coordinate address of the cell to check
+	 * @return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		//	Check if the requested entry is the current object, or exists in the cache
+		if (parent::isDataSet($pCoord)) {
+			if ($this->_currentObjectID == $pCoord) {
+				return true;
+			}
+			//	Check if the requested entry still exists in cache
+			$success = wincache_ucache_exists($this->_cachePrefix.$pCoord.'.cache');
+			if ($success === false) {
+				//	Entry no longer exists in Wincache, so clear it from the cache array
+				parent::deleteCacheData($pCoord);
+				throw new Exception('Cell entry '.$pCoord.' no longer exists in WinCache');
+			}
+			return true;
+		}
+		return false;
+	}	//	function isDataSet()
+
+
+	/**
+	 * 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
+		$obj = null;
+		if (parent::isDataSet($pCoord)) {
+			$success = false;
+			$obj = wincache_ucache_get($this->_cachePrefix.$pCoord.'.cache', $success);
+			if ($success === false) {
+				//	Entry no longer exists in WinCache, so clear it from the cache array
+				parent::deleteCacheData($pCoord);
+				throw new Exception('Cell entry '.$pCoord.' no longer exists in WinCache');
+			}
+		} else {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = unserialize($obj);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	/**
+	 * Delete a cell in cache identified by coordinate address
+	 *
+	 * @param	string			$pCoord		Coordinate address of the cell to delete
+	 * @throws	Exception
+	 */
+	public function deleteCacheData($pCoord) {
+		//	Delete the entry from Wincache
+		wincache_ucache_delete($this->_cachePrefix.$pCoord.'.cache');
+
+		//	Delete the entry from our cell address array
+		parent::deleteCacheData($pCoord);
+	}	//	function deleteCacheData()
+
+
+	/**
+	 * Clone the cell collection
+	 *
+	 * @param	PHPExcel_Worksheet	$parent		The new worksheet
+	 * @return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		parent::copyCellCollection($parent);
+		//	Get a new id for the new file name
+		$baseUnique = $this->_getUniqueID();
+		$newCachePrefix = substr(md5($baseUnique),0,8).'.';
+		$cacheList = $this->getCellList();
+		foreach($cacheList as $cellID) {
+			if ($cellID != $this->_currentObjectID) {
+				$success = false;
+				$obj = wincache_ucache_get($this->_cachePrefix.$cellID.'.cache', $success);
+				if ($success === false) {
+					//	Entry no longer exists in WinCache, so clear it from the cache array
+					parent::deleteCacheData($cellID);
+					throw new Exception('Cell entry '.$cellID.' no longer exists in Wincache');
+				}
+				if (!wincache_ucache_add($newCachePrefix.$cellID.'.cache', $obj, $this->_cacheTime)) {
+					$this->__destruct();
+					throw new Exception('Failed to store cell '.$cellID.' in Wincache');
+				}
+			}
+		}
+		$this->_cachePrefix = $newCachePrefix;
+	}	//	function copyCellCollection()
+
+
+	/**
+	 * Clear the cell collection and disconnect from our parent
+	 *
+	 * @return	void
+	 */
+	public function unsetWorksheetCells() {
+		if(!is_null($this->_currentObject)) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+
+		//	Flush the WinCache cache
+		$this->__destruct();
+
+		$this->_cellCache = array();
+
+		//	detach ourself from the worksheet, so that it can then delete this object successfully
+		$this->_parent = null;
+	}	//	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) {
+		$cacheTime	= (isset($arguments['cacheTime']))	? $arguments['cacheTime']	: 600;
+
+		if (is_null($this->_cachePrefix)) {
+			$baseUnique = $this->_getUniqueID();
+			$this->_cachePrefix = substr(md5($baseUnique),0,8).'.';
+			$this->_cacheTime = $cacheTime;
+
+			parent::__construct($parent);
+		}
+	}	//	function __construct()
+
+
+	/**
+	 * Destroy this cell collection
+	 */
+	public function __destruct() {
+		$cacheList = $this->getCellList();
+		foreach($cacheList as $cellID) {
+			wincache_ucache_delete($this->_cachePrefix.$cellID.'.cache');
+		}
+	}	//	function __destruct()
+
+
+	/**
+	 * Identify whether the caching method is currently available
+	 * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
+	 *
+	 * @return	boolean
+	 */
+	public static function cacheMethodIsAvailable() {
+		if (!function_exists('wincache_ucache_add')) {
+			return false;
+		}
+
+		return true;
+	}
+
+}
diff --git a/admin/survey/excel/PHPExcel/CachedObjectStorageFactory.php b/admin/survey/excel/PHPExcel/CachedObjectStorageFactory.php
new file mode 100644
index 0000000..d523a20
--- /dev/null
+++ b/admin/survey/excel/PHPExcel/CachedObjectStorageFactory.php
@@ -0,0 +1,239 @@
+<?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
+ * @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    1.7.8, 2012-10-12
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorageFactory
+ *
+ * @category	PHPExcel
+ * @package		PHPExcel_CachedObjectStorage
+ * @copyright	Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorageFactory
+{
+	const cache_in_memory				= 'Memory';
+	const cache_in_memory_gzip			= 'MemoryGZip';
+	const cache_in_memory_serialized	= 'MemorySerialized';
+	const cache_igbinary				= 'Igbinary';
+	const cache_to_discISAM				= 'DiscISAM';
+	const cache_to_apc					= 'APC';
+	const cache_to_memcache				= 'Memcache';
+	const cache_to_phpTemp				= 'PHPTemp';
+	const cache_to_wincache				= 'Wincache';
+	const cache_to_sqlite				= 'SQLite';
+	const cache_to_sqlite3				= 'SQLite3';
+
+
+	/**
+	 * Name of the method used for cell cacheing
+	 *
+	 * @var string
+	 */
+	private static $_cacheStorageMethod = NULL;
+
+	/**
+	 * Name of the class used for cell cacheing
+	 *
+	 * @var string
+	 */
+	private static $_cacheStorageClass = NULL;
+
+
+	/**
+	 * List of all possible cache storage methods
+	 *
+	 * @var string[]
+	 */
+	private static $_storageMethods = array(
+		self::cache_in_memory,
+		self::cache_in_memory_gzip,
+		self::cache_in_memory_serialized,
+		self::cache_igbinary,
+		self::cache_to_phpTemp,
+		self::cache_to_discISAM,
+		self::cache_to_apc,
+		self::cache_to_memcache,
+		self::cache_to_wincache,
+		self::cache_to_sqlite,
+		self::cache_to_sqlite3,
+	);
+
+
+	/**
+	 * Default arguments for each cache storage method
+	 *
+	 * @var array of mixed array
+	 */
+	private static $_storageMethodDefaultParameters = array(
+		self::cache_in_memory				=> array(
+													),
+		self::cache_in_memory_gzip			=> array(
+													),
+		self::cache_in_memory_serialized	=> array(
+													),
+		self::cache_igbinary				=> array(
+													),
+		self::cache_to_phpTemp				=> array( 'memoryCacheSize'	=> '1MB'
+													),
+		self::cache_to_discISAM				=> array( 'dir'				=> NULL
+													),
+		self::cache_to_apc					=> array( 'cacheTime'		=> 600
+													),
+		self::cache_to_memcache				=> array( 'memcacheServer'	=> 'localhost',
+													  'memcachePort'	=> 11211,
+													  'cacheTime'		=> 600
+													),
+		self::cache_to_wincache				=> array( 'cacheTime'		=> 600
+													),
+		self::cache_to_sqlite				=> array(
+													),
+		self::cache_to_sqlite3				=> array(
+													),
+	);
+
+
+	/**
+	 * Arguments for the active cache storage method
+	 *
+	 * @var array of mixed array
+	 */
+	private static $_storageMethodParameters = array();
+
+
+	/**
+	 * Return the current cache storage method
+	 *
+	 * @return string|NULL
+	 **/
+	public static function getCacheStorageMethod()
+	{
+		return self::$_cacheStorageMethod;
+	}	//	function getCacheStorageMethod()
+
+
+	/**
+	 * Return the current cache storage class
+	 *
+	 * @return PHPExcel_CachedObjectStorage_ICache|NULL
+	 **/
+	public static function getCacheStorageClass()
+	{
+		return self::$_cacheStorageClass;
+	}	//	function getCacheStorageClass()
+
+
+	/**
+	 * Return the list of all possible cache storage methods
+	 *
+	 * @return string[]
+	 **/
+	public static function getAllCacheStorageMethods()
+	{
+		return self::$_storageMethods;
+	}	//	function getCacheStorageMethods()
+
+
+	/**
+	 * Return the list of all available cache storage methods
+	 *
+	 * @return string[]
+	 **/
+	public static function getCacheStorageMethods()
+	{
+		$activeMethods = array();
+		foreach(self::$_storageMethods as $storageMethod) {
+			$cacheStorageClass = 'PHPExcel_CachedObjectStorage_' . $storageMethod;
+			if (call_user_func(array($cacheStorageClass, 'cacheMethodIsAvailable'))) {
+				$activeMethods[] = $storageMethod;
+			}
+		}
+		return $activeMethods;
+	}	//	function getCacheStorageMethods()
+
+
+	/**
+	 * Identify the cache storage method to use
+	 *
+	 * @param	string			$method		Name of the method to use for cell cacheing
+	 * @param	array of mixed	$arguments	Additional arguments to pass to the cell caching class
+	 *										when instantiating
+	 * @return boolean
+	 **/
+	public static function initialize($method = self::cache_in_memory, $arguments = array())
+	{
+		if (!in_array($method,self::$_storageMethods)) {
+			return FALSE;
+		}
+
+		$cacheStorageClass = 'PHPExcel_CachedObjectStorage_'.$method;
+		if (!call_user_func(array( $cacheStorageClass,
+								   'cacheMethodIsAvailable'))) {
+			return FALSE;
+		}
+
+		self::$_storageMethodParameters[$method] = self::$_storageMethodDefaultParameters[$method];
+		foreach($arguments as $k => $v) {
+			if (isset(self::$_storageMethodParameters[$method][$k])) {
+				self::$_storageMethodParameters[$method][$k] = $v;
+			}
+		}
+
+		if (self::$_cacheStorageMethod === NULL) {
+			self::$_cacheStorageClass = 'PHPExcel_CachedObjectStorage_' . $method;
+			self::$_cacheStorageMethod = $method;
+		}
+		return TRUE;
+	}	//	function initialize()
+
+
+	/**
+	 * Initialise the cache storage
+	 *
+	 * @param	PHPExcel_Worksheet 	$parent		Enable cell caching for this worksheet
+	 * @return	PHPExcel_CachedObjectStorage_ICache
+	 **/
+	public static function getInstance(PHPExcel_Worksheet $parent)
+	{
+		$cacheMethodIsAvailable = TRUE;
+		if (self::$_cacheStorageMethod === NULL) {
+			$cacheMethodIsAvailable = self::initialize();
+		}
+
+		if ($cacheMethodIsAvailable) {
+			$instance = new self::$_cacheStorageClass( $parent,
+													   self::$_storageMethodParameters[self::$_cacheStorageMethod]
+													 );
+			if ($instance !== NULL) {
+				return $instance;
+			}
+		}
+
+		return FALSE;
+	}	//	function getInstance()
+
+}
+\ No newline at end of file
author	Anton Luka Šijanec <anton@sijanec.eu>	2022-01-11 12:35:47 +0100
committer	Anton Luka Šijanec <anton@sijanec.eu>	2022-01-11 12:35:47 +0100
commit	19985dbb8c0aa66dc4bf7905abc1148de909097d (patch)
tree	2cd5a5d20d7e80fc2a51adf60d838d8a2c40999e /admin/survey/excel/PHPExcel/CachedObjectStorage
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