content: /*
   * 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 java.util.Comparator;
  
  /**
   * Extension methods for {@link OrderedEnumerable}.
   *
   * @param <T> Element type
   */
  public interface ExtendedOrderedEnumerable<T> extends Enumerable<T> {
    /**
     * Performs a subsequent ordering of the elements in an
     * {@link OrderedEnumerable} according to a key, using a specified
     * comparator.
     *
     * <p>The functionality provided by this method is like that provided by
     * {@link #thenBy(org.apache.calcite.linq4j.function.Function1, java.util.Comparator) thenBy}
     * or
     * {@link #thenByDescending(org.apache.calcite.linq4j.function.Function1, java.util.Comparator) thenByDescending},
     * depending on whether descending is true or false. They both perform a
     * subordinate ordering of an already sorted sequence of type
     * {@link OrderedEnumerable}.
     */
    <TKey> OrderedEnumerable<T> createOrderedEnumerable(
        Function1<T, TKey> keySelector, Comparator<TKey> comparator,
        boolean descending);
  
    /**
     * Performs a subsequent ordering of the elements in a sequence in
     * ascending order according to a key.
     */
    <TKey extends Comparable<TKey>> OrderedEnumerable<T> thenBy(
        Function1<T, TKey> keySelector);
  
    /**
     * Performs a subsequent ordering of the elements in a sequence in
     * ascending order according to a key, using a specified comparator.
     */
    <TKey> OrderedEnumerable<T> thenBy(Function1<T, TKey> keySelector,
        Comparator<TKey> comparator);
  
    /**
     * Performs a subsequent ordering of the elements in a sequence in
     * descending order according to a key.
     */
    <TKey extends Comparable<TKey>> OrderedEnumerable<T> thenByDescending(
        Function1<T, TKey> keySelector);
  
    /**
     * Performs a subsequent ordering of the elements in a sequence in
     * descending order according to a key, using a specified comparator.
     */
    <TKey> OrderedEnumerable<T> thenByDescending(Function1<T, TKey> keySelector,
        Comparator<TKey> comparator);
  }
  