eZ\Publish\Core\REST\Common\Output\ValueObjectVisitor::serializeSortOrder PHP Method

    protected function serializeSortOrder($sortOrder)
    {
        switch ($sortOrder) {
            case Location::SORT_ORDER_ASC:
                return 'ASC';
            case Location::SORT_ORDER_DESC:
                return 'DESC';
        }
        throw new \RuntimeException("Unknown default sort order: '{$sortOrder}'.");
    }