protected static function isValidRawOrder(array $rawOrder) {
        if (false === array_key_exists(DataTablesOrderInterface::DATATABLES_PARAMETER_COLUMN, $rawOrder)) {
            return false;
        }
        if (false === array_key_exists(DataTablesOrderInterface::DATATABLES_PARAMETER_DIR, $rawOrder)) {
            return false;
        }
        return true;
    }