org.apache.commons.collections.iterators
Class EmptyIterator<E>

java.lang.Object
  org.apache.commons.collections.iterators.EmptyIterator<E>

All Implemented Interfaces:

Iterator<E>, ResettableIterator<E>

public class EmptyIterator<E>
extends Object
implements ResettableIterator<E>

Provides an implementation of an empty iterator.

This class provides an implementation of an empty iterator. This class provides for binary compatability between Commons Collections 2.1.1 and 3.1 due to issues with IteratorUtils.

Since:

Commons Collections 2.1.1 and 3.1

Version:

$Revision: 1.1.1.1 $ $Date: 2005/05/23 04:34:49 $

Author:

Matt Hall, John Watkinson, Stephen Colebourne

Field Summary

static Iterator	INSTANCE Singleton instance of the iterator.
static ResettableIterator	RESETTABLE_INSTANCE Singleton instance of the iterator.

Constructor Summary

protected

EmptyIterator() Constructor.

Method Summary

void	add(E obj)
E	getKey()
E	getValue()
boolean	hasNext()
boolean	hasPrevious()
E	next()
int	nextIndex()
E	previous()
int	previousIndex()
void	remove()
void	reset()
void	set(E obj)
E	setValue(E value)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.collections.ResettableIterator

reset

Methods inherited from interface java.util.Iterator

hasNext, next, remove

Field Detail

RESETTABLE_INSTANCE

public static final ResettableIterator RESETTABLE_INSTANCE

Singleton instance of the iterator.

Since:

Commons Collections 3.1

INSTANCE

public static final Iterator INSTANCE

Singleton instance of the iterator.

Since:

Commons Collections 2.1.1 and 3.1

Constructor Detail

EmptyIterator

protected EmptyIterator()

Constructor.

Method Detail

hasNext

public boolean hasNext()

next

public E next()

hasPrevious

public boolean hasPrevious()

previous

public E previous()

nextIndex

public int nextIndex()

previousIndex

public int previousIndex()

add

public void add(E obj)

set

public void set(E obj)

remove

public void remove()

getKey

public E getKey()

getValue

public E getValue()

setValue

public E setValue(E value)

reset

public void reset()