public function compressFile( $fileUri )
	{
		if( !file_exists( $fileUri ) )
			throw new Exception( "Style File '".$fileUri."' is not existing." );

		$content	= self::compressString( file_get_contents( $fileUri ) );
		$pathName	= dirname( $fileUri );
		$styleFile	= basename( $fileUri );
		$styleName	= preg_replace( "@\.css$@", "", $styleFile );
		$fileName	= $this->prefix.$styleName.$this->suffix.".css";
		$fileUri	= $pathName."/".$fileName;
		$fileUri	= str_replace( "\\", "/", $fileUri );
		file_put_contents( $fileUri, $content );
		return $fileUri;
	}