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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 java.util.Set;

/**
 * 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
 */
public abstract class ForwardingSet extends ForwardingCollection
    implements Set {

  /**
   * Constructs a forwarding set that forwards to the provided delegate.
   */
  protected ForwardingSet(Set delegate) {
    super(delegate);
  }

  @SuppressWarnings("unchecked")
  @Override protected Set delegate() {
    return (Set) super.delegate();
  }

  @Override public boolean equals(Object obj) {
    return delegate().equals(obj);
  }

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

  /* Standard implementations from AbstractSet. */

  /**
   * Compares the specified object with the specified set for equality. Returns
   * true if the specified object is also set, the two sets have the same size,
   * and every member of the set {@code o} is contained in the set {@code s}.
   *
   * 

This method first checks if the object {@code o} is the set {@code s}; * if so it returns true. Then, it checks if {@code o} is a set whose size is * identical to the size of {@code s}; if not, it returns false. If so, it * returns {@code s.containsAll((Collection) o)}. * * @param s the set to be compared for equality with the specified object * @param o the object to be compared for equality with the specified set * @return true if the object {@code o} is equal to the set {@code s} * @see java.util.AbstractSet#equals(Object) */ @SuppressWarnings("unchecked") static boolean equalsImpl(Set s, Object o) { if (o == s) { return true; } if (!(o instanceof Set)) { return false; } Set os = (Set) o; if (os.size() != s.size()) { return false; } return s.containsAll(os); } }





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