public function getItemPublicUrl(RunnerServiceContext $context, $itemRef){
        if ($context instanceof QtiRunnerServiceContext) {
            $directoryIds = explode('|', $itemRef);

            $userDataLang = \common_session_SessionManager::getSession()->getDataLanguage();

            $directory = \tao_models_classes_service_FileStorage::singleton()->getDirectoryById($directoryIds[1]);
            // do fallback in case userlanguage is not default language
            if ($userDataLang != DEFAULT_LANG && !$directory->has($userDataLang) && $directory->has(DEFAULT_LANG)) {
                $userDataLang = DEFAULT_LANG;
            }
            return $directory->getPublicAccessUrl().$userDataLang.'/';
        } else {
            throw new \common_exception_InvalidArgumentType(
                'QtiRunnerService',
                'getItemPublicUrl',
                0,
                'oat\taoQtiTest\models\runner\QtiRunnerServiceContext',
                $context
            );
        }
    }