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/*
 * Copyright (C) 2007 Google Inc.
 *
 * 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 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.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
public interface BiMap extends Map {
  // 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.
   */
  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.
   *
   * 

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. * *

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 */ V forcePut(@Nullable K key, @Nullable V value); // Bulk Operations /** * {@inheritDoc} * *

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. */ void putAll(Map map); // Views /** * {@inheritDoc} * *

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. */ Set 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. * *

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 inverse(); }





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