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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.checkNotNull;
 
 
 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.

Warning: The methods of ForwardingSet forward indiscriminately to the methods of the delegate. For example, overriding add alone will not change the behavior of addAll, which can lead to unexpected behavior. In this case, you should override addAll as well, either providing your own implementation, or delegating to the provided standardAddAll method.

The standard methods are not guaranteed to be thread-safe, even when all of the methods that they depend on are thread-safe.

Author(s):
Kevin Bourrillion
Louis Wasserman
Since:
2.0 (imported from Google Collections Library)
 
 public abstract class ForwardingSet<E> extends ForwardingCollection<E>
     implements Set<E> {
   // TODO(user): identify places where thread safety is actually lost
 
  
Constructor for use by subclasses.
 
   protected ForwardingSet() {}
 
   @Override protected abstract Set<E> delegate();
 
   @Override public boolean equals(@Nullable Object object) {
     return object == this || delegate().equals(object);
   }
 
   @Override public int hashCode() {
     return delegate().hashCode();
   }

  
A sensible definition of removeAll in terms of iterator and remove. If you override iterator or remove, you may wish to override removeAll to forward to this implementation.

Since:
7.0 (this version overrides the ForwardingCollection version as of 12.0)
 
   @Override
   protected boolean standardRemoveAll(Collection<?> collection) {
     return Sets.removeAllImpl(thischeckNotNull(collection)); // for GWT
   }

  
A sensible definition of equals in terms of size and containsAll. If you override either of those methods, you may wish to override equals to forward to this implementation.

Since:
7.0
 
   protected boolean standardEquals(@Nullable Object object) {
     return Sets.equalsImpl(thisobject);
   }

  
A sensible definition of hashCode in terms of iterator. If you override iterator, you may wish to override equals to forward to this implementation.

Since:
7.0
 
   protected int standardHashCode() {
     return Sets.hashCodeImpl(this);
   }
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