protected function get_next_converter($converters, $currentconverter = null) {
        if ($currentconverter) {
            $keys = array_keys($converters, $currentconverter);
            $key = $keys[0];
            if (isset($converters[$key + 1])) {
                return $converters[$key + 1];
            } else {
                return false;
            }
        } else if (!empty($converters)) {
            return $converters[0];
        } else {
            return false;
        }
    }