io.trino.sql.planner.OrderingTranslator Maven / Gradle / Ivy

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.trino.sql.planner;

import io.trino.spi.connector.SortOrder;
import io.trino.sql.tree.SortItem;

public class OrderingTranslator
{
    private OrderingTranslator() {}

    public static SortOrder sortItemToSortOrder(SortItem sortItem)
    {
        if (sortItem.getOrdering() == SortItem.Ordering.ASCENDING) {
            if (sortItem.getNullOrdering() == SortItem.NullOrdering.FIRST) {
                return SortOrder.ASC_NULLS_FIRST;
            }
            return SortOrder.ASC_NULLS_LAST;
        }

        if (sortItem.getNullOrdering() == SortItem.NullOrdering.FIRST) {
            return SortOrder.DESC_NULLS_FIRST;
        }
        return SortOrder.DESC_NULLS_LAST;
    }
}