com.google.common.collect
Class ForwardingSet<E>

java.lang.Object
  extended by com.google.common.collect.ForwardingObject
      extended by com.google.common.collect.ForwardingCollection<E>
          extended by com.google.common.collect.ForwardingSet<E>
All Implemented Interfaces:
Iterable<E>, Collection<E>, Set<E>
Direct Known Subclasses:
ForwardingSortedSet

@GwtCompatible
public abstract class ForwardingSet<E>
extends ForwardingCollection<E>
implements Set<E>

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 ForwardingCollection.add(E) alone will not change the behavior of ForwardingCollection.addAll(java.util.Collection), 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.

Since:
2.0 (imported from Google Collections Library)
Author:
Kevin Bourrillion, Louis Wasserman

Constructor Summary
protected ForwardingSet()
          Constructor for use by subclasses.
 
Method Summary
protected abstract  Set<E> delegate()
          Returns the backing delegate instance that methods are forwarded to.
 boolean equals(Object object)
           
 int hashCode()
           
protected  boolean standardEquals(Object object)
          A sensible definition of equals(java.lang.Object) in terms of ForwardingCollection.size() and ForwardingCollection.containsAll(java.util.Collection).
protected  int standardHashCode()
          A sensible definition of hashCode() in terms of ForwardingCollection.iterator().
 
Methods inherited from class com.google.common.collect.ForwardingCollection
add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, standardAddAll, standardClear, standardContains, standardContainsAll, standardIsEmpty, standardRemove, standardRemoveAll, standardRetainAll, standardToArray, standardToArray, standardToString, toArray, toArray
 
Methods inherited from class com.google.common.collect.ForwardingObject
toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface java.util.Set
add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray
 

Constructor Detail

ForwardingSet

protected ForwardingSet()
Constructor for use by subclasses.

Method Detail

delegate

protected abstract Set<E> delegate()
Description copied from class: ForwardingObject
Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such as delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:
delegate in class ForwardingCollection<E>

equals

public boolean equals(@Nullable
                      Object object)
Specified by:
equals in interface Collection<E>
Specified by:
equals in interface Set<E>
Overrides:
equals in class Object

hashCode

public int hashCode()
Specified by:
hashCode in interface Collection<E>
Specified by:
hashCode in interface Set<E>
Overrides:
hashCode in class Object

standardEquals

@Beta
protected boolean standardEquals(@Nullable
                                      Object object)
A sensible definition of equals(java.lang.Object) in terms of ForwardingCollection.size() and ForwardingCollection.containsAll(java.util.Collection). If you override either of those methods, you may wish to override equals(java.lang.Object) to forward to this implementation.

Since:
7.0

standardHashCode

@Beta
protected int standardHashCode()
A sensible definition of hashCode() in terms of ForwardingCollection.iterator(). If you override ForwardingCollection.iterator(), you may wish to override equals(java.lang.Object) to forward to this implementation.

Since:
7.0


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