Package org.apache.commons.collections4.iterators

Class EmptyIterator<E>

java.lang.Object

org.apache.commons.collections4.iterators.EmptyIterator<E>

All Implemented Interfaces:

java.util.Iterator<E>, ResettableIterator<E>

public class EmptyIterator<E>
extends java.lang.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 compatibility between Commons Collections 2.1.1 and 3.1 due to issues with IteratorUtils.

Since:

2.1.1 and 3.1

Version:

$Id: EmptyIterator.java 1543955 2013-11-20 21:23:53Z tn $

Field Summary

Fields

Modifier and Type	Field	Description
static java.util.Iterator	INSTANCE	Singleton instance of the iterator.
static ResettableIterator	RESETTABLE_INSTANCE	Singleton instance of the iterator.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	EmptyIterator()	Constructor.

Method Summary

Modifier and Type	Method	Description
void	add(E obj)
static <E> java.util.Iterator<E>	emptyIterator()	Get a typed empty iterator instance.
boolean	hasNext()
boolean	hasPrevious()
E	next()
int	nextIndex()
E	previous()
int	previousIndex()
void	remove()
void	reset()
static <E> ResettableIterator<E>	resettableEmptyIterator()	Get a typed resettable empty iterator instance.
void	set(E obj)

Methods inherited from interface java.util.Iterator

forEachRemaining, hasNext, next, remove

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.collections4.ResettableIterator

reset

Field Detail

RESETTABLE_INSTANCE

public static final ResettableIterator RESETTABLE_INSTANCE

Singleton instance of the iterator.

Since:

3.1

INSTANCE

public static final java.util.Iterator INSTANCE

Singleton instance of the iterator.

Since:

2.1.1 and 3.1

Constructor Detail

EmptyIterator

protected EmptyIterator()

Constructor.

Method Detail

resettableEmptyIterator

public static <E> ResettableIterator<E> resettableEmptyIterator()

Get a typed resettable empty iterator instance.

Type Parameters:

E - the element type

Returns:

ResettableIterator

emptyIterator

public static <E> java.util.Iterator<E> emptyIterator()

Get a typed empty iterator instance.

Type Parameters:

E - the element type

Returns:

Iterator

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()

reset

public void reset()