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Guava Collections is a collections extension library with expanded collection types, implementations, and utility methods for dealing with aggregate data.

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/*
 * Copyright (C) 2007 Google Inc.
 *
 * 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.Set;

import javax.annotation.Nullable;

/**
 * A set which forwards all its method calls to another set. Subclasses should
 * override one or more methods to modify the behavior of the backing set as
 * desired per the decorator pattern.
 *
 * @see ForwardingObject
 * @author Kevin Bourrillion
 * @since 2 (imported from Google Collections Library)
 */
@GwtCompatible
public abstract class ForwardingSet extends ForwardingCollection
    implements Set {

  @Override protected abstract Set delegate();

  @Override public boolean equals(@Nullable Object object) {
    return object == this || delegate().equals(object);
  }

  @Override public int hashCode() {
    return delegate().hashCode();
  }
}