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/*
 * Copyright (C) 2007 The Guava Authors
 *
 * 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 com.google.common.collect;

import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A {@code Multimap} that can hold duplicate key-value pairs and that maintains the insertion
 * ordering of values for a given key. See the {@link Multimap} documentation for information common
 * to all multimaps.
 *
 * The {@link #get}, {@link #removeAll}, and {@link #replaceValues} methods each return a {@link
 * List} of values. Though the method signature doesn't say so explicitly, the map returned by
 * {@link #asMap} has {@code List} values.
 *
 * 
See the Guava User Guide article on {@code Multimap}.
 *
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public interface ListMultimap
    extends Multimap {
  /**
   * {@inheritDoc}
   *
   * 
Because the values for a given key may have duplicates and follow the insertion ordering,
   * this method returns a {@link List}, instead of the {@link java.util.Collection} specified in
   * the {@link Multimap} interface.
   */
  @Override
  List get(@ParametricNullness K key);

  /**
   * {@inheritDoc}
   *
   * 
Because the values for a given key may have duplicates and follow the insertion ordering,
   * this method returns a {@link List}, instead of the {@link java.util.Collection} specified in
   * the {@link Multimap} interface.
   */
  @CanIgnoreReturnValue
  @Override
  List removeAll(@CheckForNull Object key);

  /**
   * {@inheritDoc}
   *
   * 
Because the values for a given key may have duplicates and follow the insertion ordering,
   * this method returns a {@link List}, instead of the {@link java.util.Collection} specified in
   * the {@link Multimap} interface.
   */
  @CanIgnoreReturnValue
  @Override
  List replaceValues(@ParametricNullness K key, Iterable values);

  /**
   * {@inheritDoc}
   *
   * 
Note: The returned map's values are guaranteed to be of type {@link List}. To obtain
   * this map with the more specific generic type {@code Map>}, call {@link
   * Multimaps#asMap(ListMultimap)} instead.
   */
  @Override
  Map> asMap();

  /**
   * Compares the specified object to this multimap for equality.
   *
   * 
Two {@code ListMultimap} instances are equal if, for each key, they contain the same values
   * in the same order. If the value orderings disagree, the multimaps will not be considered equal.
   *
   * An empty {@code ListMultimap} is equal to any other empty {@code Multimap}, including an
   * empty {@code SetMultimap}.
   */
  @Override
  boolean equals(@CheckForNull Object obj);
}