Implemented clear() method to avoid any confusing situations when

receiving an old instance of compressor.

libraries/joomla/media/compressor.php

@@ -298,10 +298,10 @@ public static function compressFile( $sourcefile, $options = array(),  $destinat
 	public static function getInstance($options = array())
 	{
 
-		// Get the options signature for the database connector.
+		// Get the options signature for the compressor.
 		$signature = md5(serialize($options));
 
-		// If we already have a database connector instance for these options then just use that.
+		// If we already have a compressor instance for these options then just use that.
 		if (empty(self::$instances[$signature]))
 		{
 			// Derive the class name from the type.
@@ -329,6 +329,11 @@ public static function getInstance($options = array())
 			// Set the new connector to the global instances based on signature.
 			self::$instances[$signature] = $instance;
 		}
+		else
+		{
+			$instance = self::$instances[$signature];
+			$instance->clear();
+		}
 
 		return self::$instances[$signature];
 	}
@@ -358,4 +363,19 @@ public static function isSupported($sourceFile)
 			}
 		}
 	}
+
+	/**
+	 * Method to clear compressor data
+	 * 
+	 * @return  void
+	 * 
+	 * @since  12.1
+	 */
+	public function clear()
+	{
+		$this->_compressed = null;
+		$this->_compressedSize = null;
+		$this->_uncompressed = null;
+		$this->_uncompressedSize = null;
+	}
 }

libraries/joomla/media/compressor/css.php

@@ -245,5 +245,19 @@ private function _breakInToLines($source)
 								);
 		return $source;
 	}
+	
+	/**
+	 * Method to clear compressor data
+	 *
+	 * @return  void
+	 *
+	 * @since  12.1
+	 */
+	public function clear()
+	{
+		parent::clear();
+		
+		$this->_inHack = false;
+	}
 
 }

libraries/joomla/media/compressor/js.php

@@ -471,4 +471,24 @@ private function  _handleComments()
 
 		return $comment;
 	}
+
+	/**
+	 * Method to clear compressor data
+	 *
+	 * @return  void
+	 *
+	 * @since  12.1
+	 */
+	public function clear()
+	{
+		parent::clear();
+
+		$this->_a = "\n";
+		$this->_b = '';
+		$this->_nextIndex = 0;
+		$this->_startLength = 0;
+		$this->_preLoaded = '';
+		$this->_previousChar = '';
+
+	}
 }