private function getKey ( $key = NULL ) {
        if ($key === NULL) {
            $key = $this->__keyName;
            return $this->getClassKey() . '_' . $this->$key;
        }
        return $this->getClassKey() . '_' . $key;
    }
private function getKey ( $key = NULL ) {
        if ($key === NULL) {
            $key = $this->__keyName;
            return $this->getClassKey() . '_' . $this->$key;
        }
        return $this->getClassKey() . '_' . $key;
    }
private function getKey ( $ key = NULL ) { if ( $ key === NULL ) { $ key = $ this -> __keyName ; return $ this -> getClassKey ( ) . '_' . $ this -> $ key ; } return $ this -> getClassKey ( ) . '_' . $ key ; }
returns the key for scope cache
@param string $key
@return string
returns the key for scope cache