com.google.common.collect

Class ForwardingSet<E>

java.lang.Object

com.google.common.collect.ForwardingObject

com.google.common.collect.ForwardingCollection<E>

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

All Implemented Interfaces:

java.lang.Iterable<E>, java.util.Collection<E>, java.util.Set<E>

Direct Known Subclasses:

ForwardingSortedSet

@GwtCompatible
public abstract class ForwardingSet<E>
extends ForwardingCollection<E>
implements java.util.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)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ForwardingSet() Constructor for use by subclasses.

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract java.util.Set<E>	delegate() Returns the backing delegate instance that methods are forwarded to.
boolean	equals(java.lang.Object object)
int	hashCode()
protected boolean	standardEquals(java.lang.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 java.util.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
             java.lang.Object object)

Specified by:

equals in interface java.util.Collection<E>

Specified by:

equals in interface java.util.Set<E>

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Collection<E>

Specified by:

hashCode in interface java.util.Set<E>

Overrides:

hashCode in class java.lang.Object

standardEquals

@Beta
protected boolean standardEquals(@Nullable
                          java.lang.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