1 files changed, 95 insertions, 0 deletions
diff --git a/guava/src/com/google/common/collect/EmptyImmutableMap.java b/guava/src/com/google/common/collect/EmptyImmutableMap.java
new file mode 100644
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--- /dev/null
+++ b/guava/src/com/google/common/collect/EmptyImmutableMap.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2008 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 java.util.Map;
+
+import javax.annotation.Nullable;
+
+/**
+ * An empty immutable map.
+ * 
+ * @author Jesse Wilson
+ * @author Kevin Bourrillion
+ */
+@GwtCompatible(serializable = true, emulated = true)
+final class EmptyImmutableMap extends ImmutableMap<Object, Object> {
+  static final EmptyImmutableMap INSTANCE = new EmptyImmutableMap();
+
+  private EmptyImmutableMap() {}
+
+  @Override public Object get(@Nullable Object key) {
+    return null;
+  }
+
+  @Override
+  public int size() {
+    return 0;
+  }
+
+  @Override public boolean isEmpty() {
+    return true;
+  }
+
+  @Override public boolean containsKey(@Nullable Object key) {
+    return false;
+  }
+
+  @Override public boolean containsValue(@Nullable Object value) {
+    return false;
+  }
+
+  @Override public ImmutableSet<Entry<Object, Object>> entrySet() {
+    return ImmutableSet.of();
+  }
+
+  @Override public ImmutableSet<Object> keySet() {
+    return ImmutableSet.of();
+  }
+
+  @Override public ImmutableCollection<Object> values() {
+    return ImmutableCollection.EMPTY_IMMUTABLE_COLLECTION;
+  }
+
+  @Override public boolean equals(@Nullable Object object) {
+    if (object instanceof Map) {
+      Map<?, ?> that = (Map<?, ?>) object;
+      return that.isEmpty();
+    }
+    return false;
+  }
+
+  @Override boolean isPartialView() {
+    return false;
+  }
+
+  @Override public int hashCode() {
+    return 0;
+  }
+
+  @Override public String toString() {
+    return "{}";
+  }
+
+  Object readResolve() {
+    return INSTANCE; // preserve singleton property
+  }
+
+  private static final long serialVersionUID = 0;
+}