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001 /*
002 * Copyright (C) 2007 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package com.google.common.collect;
018
019 import com.google.common.annotations.GwtCompatible;
020 import com.google.common.annotations.GwtIncompatible;
021
022 import java.io.IOException;
023 import java.io.ObjectInputStream;
024 import java.io.ObjectOutputStream;
025 import java.util.HashMap;
026 import java.util.Map;
027
028 import javax.annotation.Nullable;
029
030 /**
031 * A {@link BiMap} backed by two {@link HashMap} instances. This implementation
032 * allows null keys and values. A {@code HashBiMap} and its inverse are both
033 * serializable.
034 *
035 * @author Mike Bostock
036 * @since 2.0 (imported from Google Collections Library)
037 */
038 @GwtCompatible(emulated = true)
039 public final class HashBiMap<K, V> extends AbstractBiMap<K, V> {
040
041 /**
042 * Returns a new, empty {@code HashBiMap} with the default initial capacity
043 * (16).
044 */
045 public static <K, V> HashBiMap<K, V> create() {
046 return new HashBiMap<K, V>();
047 }
048
049 /**
050 * Constructs a new, empty bimap with the specified expected size.
051 *
052 * @param expectedSize the expected number of entries
053 * @throws IllegalArgumentException if the specified expected size is
054 * negative
055 */
056 public static <K, V> HashBiMap<K, V> create(int expectedSize) {
057 return new HashBiMap<K, V>(expectedSize);
058 }
059
060 /**
061 * Constructs a new bimap containing initial values from {@code map}. The
062 * bimap is created with an initial capacity sufficient to hold the mappings
063 * in the specified map.
064 */
065 public static <K, V> HashBiMap<K, V> create(
066 Map<? extends K, ? extends V> map) {
067 HashBiMap<K, V> bimap = create(map.size());
068 bimap.putAll(map);
069 return bimap;
070 }
071
072 private HashBiMap() {
073 super(new HashMap<K, V>(), new HashMap<V, K>());
074 }
075
076 private HashBiMap(int expectedSize) {
077 super(
078 Maps.<K, V>newHashMapWithExpectedSize(expectedSize),
079 Maps.<V, K>newHashMapWithExpectedSize(expectedSize));
080 }
081
082 // Override these two methods to show that keys and values may be null
083
084 @Override public V put(@Nullable K key, @Nullable V value) {
085 return super.put(key, value);
086 }
087
088 @Override public V forcePut(@Nullable K key, @Nullable V value) {
089 return super.forcePut(key, value);
090 }
091
092 /**
093 * @serialData the number of entries, first key, first value, second key,
094 * second value, and so on.
095 */
096 @GwtIncompatible("java.io.ObjectOutputStream")
097 private void writeObject(ObjectOutputStream stream) throws IOException {
098 stream.defaultWriteObject();
099 Serialization.writeMap(this, stream);
100 }
101
102 @GwtIncompatible("java.io.ObjectInputStream")
103 private void readObject(ObjectInputStream stream)
104 throws IOException, ClassNotFoundException {
105 stream.defaultReadObject();
106 int size = Serialization.readCount(stream);
107 setDelegates(Maps.<K, V>newHashMapWithExpectedSize(size),
108 Maps.<V, K>newHashMapWithExpectedSize(size));
109 Serialization.populateMap(this, stream, size);
110 }
111
112 @GwtIncompatible("Not needed in emulated source")
113 private static final long serialVersionUID = 0;
114 }