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Java example source code file (BiMap.java)

This example Java source code file (BiMap.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

annotation, bimap, canignorereturnvalue, gwtcompatible, nullable, override, set, util

The BiMap.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.Map;
import java.util.Set;

import javax.annotation.Nullable;

/**
 * A bimap (or "bidirectional map") is a map that preserves the uniqueness of
 * its values as well as that of its keys. This constraint enables bimaps to
 * support an "inverse view", which is another bimap containing the same entries
 * as this bimap but with reversed keys and values.
 *
 * <p>See the Guava User Guide article on  {
  // Modification Operations

  /**
   * {@inheritDoc}
   *
   * @throws IllegalArgumentException if the given value is already bound to a
   *     different key in this bimap. The bimap will remain unmodified in this
   *     event. To avoid this exception, call {@link #forcePut} instead.
   */
  @CanIgnoreReturnValue
  @Override
  @Nullable
  V put(@Nullable K key, @Nullable V value);

  /**
   * An alternate form of {@code put} that silently removes any existing entry
   * with the value {@code value} before proceeding with the {@link #put}
   * operation. If the bimap previously contained the provided key-value
   * mapping, this method has no effect.
   *
   * <p>Note that a successful call to this method could cause the size of the
   * bimap to increase by one, stay the same, or even decrease by one.
   *
   * <p>Warning: If an existing entry with this value is removed, the key
   * for that entry is discarded and not returned.
   *
   * @param key the key with which the specified value is to be associated
   * @param value the value to be associated with the specified key
   * @return the value which was previously associated with the key, which may
   *     be {@code null}, or {@code null} if there was no previous entry
   */
  @CanIgnoreReturnValue
  @Nullable
  V forcePut(@Nullable K key, @Nullable V value);

  // Bulk Operations

  /**
   * {@inheritDoc}
   *
   * <p>Warning: the results of calling this method may vary depending on
   * the iteration order of {@code map}.
   *
   * @throws IllegalArgumentException if an attempt to {@code put} any
   *     entry fails. Note that some map entries may have been added to the
   *     bimap before the exception was thrown.
   */
  @Override
  void putAll(Map<? extends K, ? extends V> map);

  // Views

  /**
   * {@inheritDoc}
   *
   * <p>Because a bimap has unique values, this method returns a {@link Set},
   * instead of the {@link java.util.Collection} specified in the {@link Map}
   * interface.
   */
  @Override
  Set<V> values();

  /**
   * Returns the inverse view of this bimap, which maps each of this bimap's
   * values to its associated key. The two bimaps are backed by the same data;
   * any changes to one will appear in the other.
   *
   * <p>Note:There is no guaranteed correspondence between the iteration
   * order of a bimap and that of its inverse.
   *
   * @return the inverse view of this bimap
   */
  BiMap<V, K> inverse();
}
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