1 files changed, 84 insertions, 0 deletions
diff --git a/guava/src/com/google/common/collect/ImmutableAsList.java b/guava/src/com/google/common/collect/ImmutableAsList.java
new file mode 100644
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+++ b/guava/src/com/google/common/collect/ImmutableAsList.java
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+/*
+ * Copyright (C) 2009 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.InvalidObjectException;
+import java.io.ObjectInputStream;
+import java.io.Serializable;
+
+/**
+ * List returned by {@link ImmutableCollection#asList} that delegates {@code contains} checks
+ * to the backing collection.
+ *
+ * @author Jared Levy
+ * @author Louis Wasserman
+ */
+@GwtCompatible(serializable = true, emulated = true)
+@SuppressWarnings("serial")
+abstract class ImmutableAsList<E> extends ImmutableList<E> {
+  abstract ImmutableCollection<E> delegateCollection();
+
+  @Override public boolean contains(Object target) {
+    // The collection's contains() is at least as fast as ImmutableList's
+    // and is often faster.
+    return delegateCollection().contains(target);
+  }
+
+  @Override
+  public int size() {
+    return delegateCollection().size();
+  }
+
+  @Override
+  public boolean isEmpty() {
+    return delegateCollection().isEmpty();
+  }
+
+  @Override
+  boolean isPartialView() {
+    return delegateCollection().isPartialView();
+  }
+
+  /**
+   * Serialized form that leads to the same performance as the original list.
+   */
+  @GwtIncompatible("serialization")
+  static class SerializedForm implements Serializable {
+    final ImmutableCollection<?> collection;
+    SerializedForm(ImmutableCollection<?> collection) {
+      this.collection = collection;
+    }
+    Object readResolve() {
+      return collection.asList();
+    }
+    private static final long serialVersionUID = 0;
+  }
+
+  @GwtIncompatible("serialization")
+  private void readObject(ObjectInputStream stream)
+      throws InvalidObjectException {
+    throw new InvalidObjectException("Use SerializedForm");
+  }
+
+  @GwtIncompatible("serialization")
+  @Override Object writeReplace() {
+    return new SerializedForm(delegateCollection());
+  }
+}