1 files changed, 118 insertions, 0 deletions
diff --git a/guava/src/com/google/common/collect/HashBiMap.java b/guava/src/com/google/common/collect/HashBiMap.java
new file mode 100644
index 0000000..3b7a3ca
--- /dev/null
+++ b/guava/src/com/google/common/collect/HashBiMap.java
@@ -0,0 +1,118 @@
+/*
+ * 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.common.annotations.GwtIncompatible;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.annotation.Nullable;
+
+/**
+ * A {@link BiMap} backed by two {@link HashMap} instances. This implementation
+ * allows null keys and values. A {@code HashBiMap} and its inverse are both
+ * serializable.
+ * 
+ * <p>See the Guava User Guide article on <a href=
+ * "http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained#BiMap">
+ * {@code BiMap}</a>.
+ *
+ * @author Mike Bostock
+ * @since 2.0 (imported from Google Collections Library)
+ */
+@GwtCompatible(emulated = true)
+public final class HashBiMap<K, V> extends AbstractBiMap<K, V> {
+
+  /**
+   * Returns a new, empty {@code HashBiMap} with the default initial capacity
+   * (16).
+   */
+  public static <K, V> HashBiMap<K, V> create() {
+    return new HashBiMap<K, V>();
+  }
+
+  /**
+   * Constructs a new, empty bimap with the specified expected size.
+   *
+   * @param expectedSize the expected number of entries
+   * @throws IllegalArgumentException if the specified expected size is
+   *     negative
+   */
+  public static <K, V> HashBiMap<K, V> create(int expectedSize) {
+    return new HashBiMap<K, V>(expectedSize);
+  }
+
+  /**
+   * Constructs a new bimap containing initial values from {@code map}. The
+   * bimap is created with an initial capacity sufficient to hold the mappings
+   * in the specified map.
+   */
+  public static <K, V> HashBiMap<K, V> create(
+      Map<? extends K, ? extends V> map) {
+    HashBiMap<K, V> bimap = create(map.size());
+    bimap.putAll(map);
+    return bimap;
+  }
+
+  private HashBiMap() {
+    super(new HashMap<K, V>(), new HashMap<V, K>());
+  }
+
+  private HashBiMap(int expectedSize) {
+    super(
+        Maps.<K, V>newHashMapWithExpectedSize(expectedSize),
+        Maps.<V, K>newHashMapWithExpectedSize(expectedSize));
+  }
+
+  // Override these two methods to show that keys and values may be null
+
+  @Override public V put(@Nullable K key, @Nullable V value) {
+    return super.put(key, value);
+  }
+
+  @Override public V forcePut(@Nullable K key, @Nullable V value) {
+    return super.forcePut(key, value);
+  }
+
+  /**
+   * @serialData the number of entries, first key, first value, second key,
+   *     second value, and so on.
+   */
+  @GwtIncompatible("java.io.ObjectOutputStream")
+  private void writeObject(ObjectOutputStream stream) throws IOException {
+    stream.defaultWriteObject();
+    Serialization.writeMap(this, stream);
+  }
+
+  @GwtIncompatible("java.io.ObjectInputStream")
+  private void readObject(ObjectInputStream stream)
+      throws IOException, ClassNotFoundException {
+    stream.defaultReadObject();
+    int size = Serialization.readCount(stream);
+    setDelegates(Maps.<K, V>newHashMapWithExpectedSize(size),
+        Maps.<V, K>newHashMapWithExpectedSize(size));
+    Serialization.populateMap(this, stream, size);
+  }
+
+  @GwtIncompatible("Not needed in emulated source")
+  private static final long serialVersionUID = 0;
+}