public function SetActiveSearchCacheObject(TdbShopSearchCache $oActiveSearchCache)
    {
        $this->oActiveSearchCache = &$oActiveSearchCache;
        if (!is_null($oActiveSearchCache)) {
            $_SESSION[self::SESSION_ACTIVE_SEARCH_CACHE_ID] = base64_encode(serialize($oActiveSearchCache));
        } else {
            unset($_SESSION[self::SESSION_ACTIVE_SEARCH_CACHE_ID]);
        }
    }