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diff --git a/guava/src/com/google/common/collect/EnumBiMap.java b/guava/src/com/google/common/collect/EnumBiMap.java
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+++ b/guava/src/com/google/common/collect/EnumBiMap.java
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+/*
+ * 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 static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+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.EnumMap;
+import java.util.Map;
+
+/**
+ * A {@code BiMap} backed by two {@code EnumMap} instances. Null keys and values
+ * are not permitted. An {@code EnumBiMap} 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 EnumBiMap<K extends Enum<K>, V extends Enum<V>>
+    extends AbstractBiMap<K, V> {
+  private transient Class<K> keyType;
+  private transient Class<V> valueType;
+
+  /**
+   * Returns a new, empty {@code EnumBiMap} using the specified key and value
+   * types.
+   *
+   * @param keyType the key type
+   * @param valueType the value type
+   */
+  public static <K extends Enum<K>, V extends Enum<V>> EnumBiMap<K, V>
+      create(Class<K> keyType, Class<V> valueType) {
+    return new EnumBiMap<K, V>(keyType, valueType);
+  }
+
+  /**
+   * Returns a new bimap with the same mappings as the specified map. If the
+   * specified map is an {@code EnumBiMap}, the new bimap has the same types as
+   * the provided map. Otherwise, the specified map must contain at least one
+   * mapping, in order to determine the key and value types.
+   *
+   * @param map the map whose mappings are to be placed in this map
+   * @throws IllegalArgumentException if map is not an {@code EnumBiMap}
+   *     instance and contains no mappings
+   */
+  public static <K extends Enum<K>, V extends Enum<V>> EnumBiMap<K, V>
+      create(Map<K, V> map) {
+    EnumBiMap<K, V> bimap = create(inferKeyType(map), inferValueType(map));
+    bimap.putAll(map);
+    return bimap;
+  }
+
+  private EnumBiMap(Class<K> keyType, Class<V> valueType) {
+    super(WellBehavedMap.wrap(new EnumMap<K, V>(keyType)),
+        WellBehavedMap.wrap(new EnumMap<V, K>(valueType)));
+    this.keyType = keyType;
+    this.valueType = valueType;
+  }
+
+  static <K extends Enum<K>> Class<K> inferKeyType(Map<K, ?> map) {
+    if (map instanceof EnumBiMap) {
+      return ((EnumBiMap<K, ?>) map).keyType();
+    }
+    if (map instanceof EnumHashBiMap) {
+      return ((EnumHashBiMap<K, ?>) map).keyType();
+    }
+    checkArgument(!map.isEmpty());
+    return map.keySet().iterator().next().getDeclaringClass();
+  }
+
+  private static <V extends Enum<V>> Class<V> inferValueType(Map<?, V> map) {
+    if (map instanceof EnumBiMap) {
+      return ((EnumBiMap<?, V>) map).valueType;
+    }
+    checkArgument(!map.isEmpty());
+    return map.values().iterator().next().getDeclaringClass();
+  }
+
+  /** Returns the associated key type. */
+  public Class<K> keyType() {
+    return keyType;
+  }
+
+  /** Returns the associated value type. */
+  public Class<V> valueType() {
+    return valueType;
+  }
+
+  @Override
+  K checkKey(K key) {
+    return checkNotNull(key);
+  }
+
+  @Override
+  V checkValue(V value) {
+    return checkNotNull(value);
+  }
+
+  /**
+   * @serialData the key class, value class, 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();
+    stream.writeObject(keyType);
+    stream.writeObject(valueType);
+    Serialization.writeMap(this, stream);
+  }
+
+  @SuppressWarnings("unchecked") // reading fields populated by writeObject
+  @GwtIncompatible("java.io.ObjectInputStream")
+  private void readObject(ObjectInputStream stream)
+      throws IOException, ClassNotFoundException {
+    stream.defaultReadObject();
+    keyType = (Class<K>) stream.readObject();
+    valueType = (Class<V>) stream.readObject();
+    setDelegates(
+        WellBehavedMap.wrap(new EnumMap<K, V>(keyType)),
+        WellBehavedMap.wrap(new EnumMap<V, K>(valueType)));
+    Serialization.populateMap(this, stream);
+  }
+
+  @GwtIncompatible("not needed in emulated source.")
+  private static final long serialVersionUID = 0;
+}