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Java example source code file (AbstractSetMultimap.java)

This example Java source code file (AbstractSetMultimap.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractmapbasedmultimap, abstractsetmultimap, annotation, canignorereturnvalue, collection, gwtcompatible, iterable, nullable, object, override, set, util

The AbstractSetMultimap.java Java example source code

/*
 * 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.Map;
import java.util.Set;

import javax.annotation.Nullable;

/**
 * Basic implementation of the {@link SetMultimap} interface. It's a wrapper
 * around {@link AbstractMapBasedMultimap} that converts the returned collections into
 * {@code Sets}. The {@link #createCollection} method must return a {@code Set}.
 *
 * @author Jared Levy
 */
@GwtCompatible
abstract class AbstractSetMultimap<K, V> extends AbstractMapBasedMultimap
    implements SetMultimap<K, V> {
  /**
   * Creates a new multimap that uses the provided map.
   *
   * @param map place to store the mapping from each key to its corresponding
   *     values
   */
  protected AbstractSetMultimap(Map<K, Collection map) {
    super(map);
  }

  @Override
  abstract Set<V> createCollection();

  @Override
  Set<V> createUnmodifiableEmptyCollection() {
    return ImmutableSet.of();
  }

  // Following Javadoc copied from SetMultimap.

  /**
   * {@inheritDoc}
   *
   * <p>Because a {@code SetMultimap} has unique values for a given key, this
   * method returns a {@link Set}, instead of the {@link Collection} specified
   * in the {@link Multimap} interface.
   */
  @Override
  public Set<V> get(@Nullable K key) {
    return (Set<V>) super.get(key);
  }

  /**
   * {@inheritDoc}
   *
   * <p>Because a {@code SetMultimap} has unique values for a given key, this
   * method returns a {@link Set}, instead of the {@link Collection} specified
   * in the {@link Multimap} interface.
   */
  @Override
  public Set<Map.Entry entries() {
    return (Set<Map.Entry) super.entries();
  }

  /**
   * {@inheritDoc}
   *
   * <p>Because a {@code SetMultimap} has unique values for a given key, this
   * method returns a {@link Set}, instead of the {@link Collection} specified
   * in the {@link Multimap} interface.
   */
  @CanIgnoreReturnValue
  @Override
  public Set<V> removeAll(@Nullable Object key) {
    return (Set<V>) super.removeAll(key);
  }

  /**
   * {@inheritDoc}
   *
   * <p>Because a {@code SetMultimap} has unique values for a given key, this
   * method returns a {@link Set}, instead of the {@link Collection} specified
   * in the {@link Multimap} interface.
   *
   * <p>Any duplicates in {@code values} will be stored in the multimap once.
   */
  @CanIgnoreReturnValue
  @Override
  public Set<V> replaceValues(@Nullable K key, Iterable values) {
    return (Set<V>) super.replaceValues(key, values);
  }

  /**
   * {@inheritDoc}
   *
   * <p>Though the method signature doesn't say so explicitly, the returned map
   * has {@link Set} values.
   */
  @Override
  public Map<K, Collection asMap() {
    return super.asMap();
  }

  /**
   * Stores a key-value pair in the multimap.
   *
   * @param key key to store in the multimap
   * @param value value to store in the multimap
   * @return {@code true} if the method increased the size of the multimap, or
   *     {@code false} if the multimap already contained the key-value pair
   */
  @CanIgnoreReturnValue
  @Override
  public boolean put(@Nullable K key, @Nullable V value) {
    return super.put(key, value);
  }

  /**
   * Compares the specified object to this multimap for equality.
   *
   * <p>Two {@code SetMultimap} instances are equal if, for each key, they
   * contain the same values. Equality does not depend on the ordering of keys
   * or values.
   */
  @Override
  public boolean equals(@Nullable Object object) {
    return super.equals(object);
  }

  private static final long serialVersionUID = 7431625294878419160L;
}

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