<?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    1.7.7, 2012-05-19
 */


/**
 * 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()
	{
		if (self::$_cacheStorageMethod !== NULL) {
			return self::$_cacheStorageMethod;
		}
		return NULL;
	}	//	function getCacheStorageMethod()


	/**
	 * Return the current cache storage class
	 *
	 * @return PHPExcel_CachedObjectStorage_ICache|NULL
	 **/
	public static function getCacheStorageClass()
	{
		if (self::$_cacheStorageClass !== NULL) {
			return self::$_cacheStorageClass;
		}
		return NULL;
	}	//	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()

}