public function setQuery($sQuery = null)
    {
        if (is_null($sQuery)) {
            $sQuery = "";
            if ($aParams = $this->getParameters()) {
                $aParams = $this->_prepareQueryParameters($aParams);
                $sQuery = http_build_query($aParams, "", "&");
            }
        }

        $this->_sQuery = $sQuery;
    }