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/*
 * 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  Element type
 */
public interface ExtendedOrderedEnumerable extends Enumerable {
  /**
   * Performs a subsequent ordering of the elements in an
   * {@link OrderedEnumerable} according to a key, using a specified
   * comparator.
   *
   * 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}.
   */
   OrderedEnumerable createOrderedEnumerable(
      Function1 keySelector, Comparator comparator,
      boolean descending);

  /**
   * Performs a subsequent ordering of the elements in a sequence in
   * ascending order according to a key.
   */
  > OrderedEnumerable thenBy(
      Function1 keySelector);

  /**
   * Performs a subsequent ordering of the elements in a sequence in
   * ascending order according to a key, using a specified comparator.
   */
   OrderedEnumerable thenBy(Function1 keySelector,
      Comparator comparator);

  /**
   * Performs a subsequent ordering of the elements in a sequence in
   * descending order according to a key.
   */
  > OrderedEnumerable thenByDescending(
      Function1 keySelector);

  /**
   * Performs a subsequent ordering of the elements in a sequence in
   * descending order according to a key, using a specified comparator.
   */
   OrderedEnumerable thenByDescending(Function1 keySelector,
      Comparator comparator);
}