public function getLibraryFiles($input)
    {
        // assume the result is the same string as the input
        $result = array($input);

        // just change if method for changing/translation exists
        if (method_exists($this, 'getRequiredLibraryFiles')) {
            $result = $this->getRequiredLibraryFiles($input);
        }

        // and finally return the resulting string
        return $result;
    }