linq4j/src/main/java/org/apache/calcite/linq4j/EnumerableOrderedQueryable.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.apache.calcite.linq4j;

import org.apache.calcite.linq4j.function.Function1;
import org.apache.calcite.linq4j.tree.Expression;
import org.apache.calcite.linq4j.tree.FunctionExpression;

import java.util.Comparator;

/**
 * Implementation of {@link OrderedQueryable} by an
 * {@link org.apache.calcite.linq4j.Enumerable}.
 *
 * @param <T> Element type
 */
class EnumerableOrderedQueryable<T> extends EnumerableQueryable<T>
    implements OrderedQueryable<T> {
  EnumerableOrderedQueryable(Enumerable<T> enumerable, Class<T> rowType,
      QueryProvider provider, Expression expression) {
    super(provider, rowType, expression, enumerable);
  }

  public <TKey extends Comparable<TKey>> OrderedQueryable<T> thenBy(
      FunctionExpression<Function1<T, TKey>> keySelector) {
    return QueryableDefaults.thenBy(asOrderedQueryable(), keySelector);
  }

  public <TKey> OrderedQueryable<T> thenBy(
      FunctionExpression<Function1<T, TKey>> keySelector,
      Comparator<TKey> comparator) {
    return QueryableDefaults.thenBy(asOrderedQueryable(), keySelector,
        comparator);
  }

  public <TKey extends Comparable<TKey>> OrderedQueryable<T> thenByDescending(
      FunctionExpression<Function1<T, TKey>> keySelector) {
    return QueryableDefaults.thenByDescending(asOrderedQueryable(),
        keySelector);
  }

  public <TKey> OrderedQueryable<T> thenByDescending(
      FunctionExpression<Function1<T, TKey>> keySelector,
      Comparator<TKey> comparator) {
    return QueryableDefaults.thenByDescending(asOrderedQueryable(), keySelector,
        comparator);
  }
}