public function getContextFile($context, $langcode)
    {
        if (empty($context)) {
            return '';
        }

        static $files = array();

        if (!isset($files["$context$langcode"])) {
            $filename = $this->getFilenameFromContext($context);
            $directory = $this->getCompiledDirectory($langcode);
            $files["$context$langcode"] = "$directory/$filename.csv";
        }

        return $files["$context$langcode"];
    }