public function getParentMap()
    {
        if (null !== $this->parentMap) {
            return $this->parentMap;
        }

        return $this->parentMap = $this->buildParentMap();
    }
public function getParentMap()
    {
        if (null !== $this->parentMap) {
            return $this->parentMap;
        }

        return $this->parentMap = $this->buildParentMap();
    }
public function getParentMap ( ) { if ( null !== $ this -> parentMap ) { return $ this -> parentMap ; } return $ this -> parentMap = $ this -> buildParentMap ( ) ; }
Returns the hierarchy map.

@return array
Returns the hierarchy map .