private function loadObjectFromCache($id)
    {
        $objType = $this->objType();
        if (isset(static::$objectCache[$objType][$id])) {
            return static::$objectCache[$objType][$id];
        } else {
            return null;
        }
    }
private function loadObjectFromCache($id)
    {
        $objType = $this->objType();
        if (isset(static::$objectCache[$objType][$id])) {
            return static::$objectCache[$objType][$id];
        } else {
            return null;
        }
    }
private function loadObjectFromCache ( $ id ) { $ objType = $ this -> objType ( ) ; if ( isset ( static :: $ objectCache [ $ objType ] [ $ id ] ) ) { return static :: $ objectCache [ $ objType ] [ $ id ] ; } else { return null ; } }
Retrieve an object from the cache store by its ID.

@param mixed $id The object id.
@return null|HierarchicalInterface
Retrieve an object from the cache store by its ID .