org.apache.commons.collections.iterators
Class EmptyIterator

java.lang.Object
  org.apache.commons.collections.iterators.EmptyIterator

All Implemented Interfaces:

java.util.Iterator, ResettableIterator

public class EmptyIterator
extends java.lang.Object
implements ResettableIterator

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: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $

Author:

Stephen Colebourne

Field Summary

static java.util.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(java.lang.Object obj)
java.lang.Object	getKey()
java.lang.Object	getValue()
boolean	hasNext()
boolean	hasPrevious()
java.lang.Object	next()
int	nextIndex()
java.lang.Object	previous()
int	previousIndex()
void	remove()
void	reset()
void	set(java.lang.Object obj)
java.lang.Object	setValue(java.lang.Object 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 java.util.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 java.lang.Object next()

hasPrevious

public boolean hasPrevious()

previous

public java.lang.Object previous()

nextIndex

public int nextIndex()

previousIndex

public int previousIndex()

add

public void add(java.lang.Object obj)

set

public void set(java.lang.Object obj)

remove

public void remove()

getKey

public java.lang.Object getKey()

getValue

public java.lang.Object getValue()

setValue

public java.lang.Object setValue(java.lang.Object value)

reset

public void reset()