com.google.common.collect

Class ForwardingIterator<T>

java.lang.Object

com.google.common.collect.ForwardingObject

com.google.common.collect.ForwardingIterator<T>

All Implemented Interfaces:

Iterator<T>

Direct Known Subclasses:

ForwardingListIterator

@GwtCompatible
public abstract class ForwardingIterator<T>
extends ForwardingObject
implements Iterator<T>

An iterator which forwards all its method calls to another iterator. Subclasses should override one or more methods to modify the behavior of the backing iterator as desired per the decorator pattern.

default method warning: This class forwards calls to only some default methods. Specifically, it forwards calls only for methods that existed before default methods were introduced. For newer methods, like forEachRemaining, it inherits their default implementations. When those implementations invoke methods, they invoke methods on the ForwardingIterator.

Since:

2.0

Author:

Kevin Bourrillion

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
protected abstract Iterator<T>	delegate() Returns the backing delegate instance that methods are forwarded to.
boolean	hasNext()
T	next()
void	remove()

Methods inherited from class com.google.common.collect.ForwardingObject

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

ForwardingIterator

protected ForwardingIterator()

Constructor for use by subclasses.

Method Detail

delegate

protected abstract Iterator<T> 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 ForwardingSet.delegate(). Concrete subclasses override this method to supply the instance being decorated.

Specified by:

delegate in class ForwardingObject

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

next

public T next()

Specified by:

next in interface Iterator<T>

remove

public void remove()

Specified by:

remove in interface Iterator<T>