org.apache.commons.collections4.iterators

Class EmptyIterator<E>

java.lang.Object

org.apache.commons.collections4.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 compatibility between Commons Collections 2.1.1 and 3.1 due to issues with IteratorUtils.

Since:

2.1.1 and 3.1

Field Summary

Fields

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

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EmptyIterator() Constructor.

Method Summary

Modifier and Type	Method and Description
void	add(E obj)
static <E> 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 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

Methods inherited from interface java.util.Iterator

forEachRemaining, hasNext, next, remove

Field Detail

RESETTABLE_INSTANCE

public static final ResettableIterator RESETTABLE_INSTANCE

Singleton instance of the iterator.

Since:

3.1

INSTANCE

public static final 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<E>

emptyIterator

public static <E> Iterator<E> emptyIterator()

Get a typed empty iterator instance.

Type Parameters:

E - the element type

Returns:

Iterator<E>

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()