final public function parse(\Gettext\Translations $translations, $concrete5version)
    {
        $fqClassName = $this->getClassNameForExtractor();
        if (is_string($fqClassName) && ($fqClassName !== '') && class_exists($fqClassName, true) && method_exists($fqClassName, 'exportTranslations')) {
            $translations->mergeWith(call_user_func($fqClassName.'::exportTranslations'));
        } else {
            $this->parseManual($translations, $concrete5version);
        }
    }