diff --git a/Classes/PHPExcel/CachedObjectStorage/APC.php b/Classes/PHPExcel/CachedObjectStorage/APC.php
index 56ae7f8b..ef550dc0 100644
--- a/Classes/PHPExcel/CachedObjectStorage/APC.php
+++ b/Classes/PHPExcel/CachedObjectStorage/APC.php
@@ -219,4 +219,22 @@ class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_Cach
 		}
 	}	//	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/Classes/PHPExcel/CachedObjectStorage/CacheBase.php b/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
index 4dd06fdd..43412a3e 100644
--- a/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
+++ b/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
@@ -176,4 +176,15 @@ class PHPExcel_CachedObjectStorage_CacheBase {
 		}
 	}	//	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/Classes/PHPExcel/CachedObjectStorage/ICache.php b/Classes/PHPExcel/CachedObjectStorage/ICache.php
index 1ac1497b..a400afe6 100644
--- a/Classes/PHPExcel/CachedObjectStorage/ICache.php
+++ b/Classes/PHPExcel/CachedObjectStorage/ICache.php
@@ -101,4 +101,12 @@ interface PHPExcel_CachedObjectStorage_ICache
 	 */
 	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/Classes/PHPExcel/CachedObjectStorage/Igbinary.php b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
index 1c6ba312..63012b7a 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
@@ -108,4 +108,19 @@ class PHPExcel_CachedObjectStorage_Igbinary extends PHPExcel_CachedObjectStorage
 		$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/Classes/PHPExcel/CachedObjectStorage/Memcache.php b/Classes/PHPExcel/CachedObjectStorage/Memcache.php
index 4a134105..a4780ee9 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Memcache.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Memcache.php
@@ -237,4 +237,18 @@ class PHPExcel_CachedObjectStorage_Memcache extends PHPExcel_CachedObjectStorage
 		}
 	}	//	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/Classes/PHPExcel/CachedObjectStorage/SQLite.php b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
index ddbdb8e5..5813714b 100644
--- a/Classes/PHPExcel/CachedObjectStorage/SQLite.php
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
@@ -220,4 +220,19 @@ class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_C
 		$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/Classes/PHPExcel/CachedObjectStorage/SQLite3.php b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
index 00bf16a1..541d097f 100644
--- a/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
@@ -227,4 +227,19 @@ class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_
 		$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')) {
+			return false;
+		}
+
+		return true;
+	}
+
 }
diff --git a/Classes/PHPExcel/CachedObjectStorage/Wincache.php b/Classes/PHPExcel/CachedObjectStorage/Wincache.php
index 93ce9549..4b400693 100644
--- a/Classes/PHPExcel/CachedObjectStorage/Wincache.php
+++ b/Classes/PHPExcel/CachedObjectStorage/Wincache.php
@@ -231,4 +231,19 @@ class PHPExcel_CachedObjectStorage_Wincache extends PHPExcel_CachedObjectStorage
 		}
 	}	//	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/Classes/PHPExcel/CachedObjectStorageFactory.php b/Classes/PHPExcel/CachedObjectStorageFactory.php
index b6f53995..849de05a 100644
--- a/Classes/PHPExcel/CachedObjectStorageFactory.php
+++ b/Classes/PHPExcel/CachedObjectStorageFactory.php
@@ -81,50 +81,31 @@ class PHPExcel_CachedObjectStorageFactory {
 	}	//	function getCacheStorageClass()
 
 
-	public static function getCacheStorageMethods() {
+	public static function getAllCacheStorageMethods() {
 		return self::$_storageMethods;
 	}	//	function getCacheStorageMethods()
 
 
+	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 $activeMethods;
+	}	//	function getCacheStorageMethods()
+
+
 	public static function initialize($method = self::cache_in_memory, $arguments = array()) {
 		if (!in_array($method,self::$_storageMethods)) {
 			return false;
 		}
 
-		switch($method) {
-			case self::cache_to_apc	:
-				if (!function_exists('apc_store')) {
-					return false;
-				}
-				if (apc_sma_info() === false) {
-					return false;
-				}
-				break;
-			case self::cache_to_memcache :
-				if (!function_exists('memcache_add')) {
-					return false;
-				}
-				break;
-			case self::cache_to_wincache :
-				if (!function_exists('wincache_ucache_add')) {
-					return false;
-				}
-				break;
-			case self::cache_to_sqlite :
-				if (!function_exists('sqlite_open')) {
-					return false;
-				}
-				break;
-			case self::cache_to_sqlite3 :
-				if (!class_exists('SQLite3')) {
-					return false;
-				}
-				break;
-			case self::cache_igbinary :
-				if (!function_exists('igbinary_serialize')) {
-					return false;
-				}
-				break;
+		$cacheStorageClass = 'PHPExcel_CachedObjectStorage_'.$method;
+		if (!call_user_func(array($cacheStorageClass,'cacheMethodIsAvailable'))) {
+			return false;
 		}
 
 		self::$_storageMethodParameters[$method] = self::$_storageMethodDefaultParameters[$method];