private function classExists( $fqcn )
	{
		if ( isset( $this->classExists[$fqcn] ) )
			return $this->classExists[$fqcn];

		// first check if the class already exists, maybe loaded through another AnnotationReader
		if ( class_exists( $fqcn ) )
			return $this->classExists[$fqcn] = true;

		return false;
	}