protected function _isLanguage($sourceSurveyId, $language)
    {
        if ($language && strlen($language)) {
            // Check for availability of language
            $sql = 'SELECT surveyls_language FROM ' . $this->_getSurveyLanguagesTableName() . ' WHERE surveyls_survey_id = ? AND surveyls_language = ?';
            $lsDb = $this->getSourceDatabase();

            return $lsDb->fetchOne($sql, array($sourceSurveyId, $language));
        }

        return false;
    }