org.apache.flink.runtime.util

Class EmptyIterator<E>

java.lang.Object

org.apache.flink.runtime.util.EmptyIterator<E>

All Implemented Interfaces:

Iterable<E>, Iterator<E>

public final class EmptyIterator<E>
extends Object
implements Iterator<E>, Iterable<E>

An empty iterator that never returns anything.

Constructor Summary

Constructors

Constructor and Description
EmptyIterator()

Method Summary

Methods

Modifier and Type	Method and Description
static <E> EmptyIterator<E>	get() Gets a singleton instance of the empty iterator.
boolean	hasNext() Always returns false, since this iterator is empty.
Iterator<E>	iterator()
E	next() Always throws a NoSuchElementException.
void	remove() Throws a UnsupportedOperationException.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyIterator

public EmptyIterator()

Method Detail

get

public static <E> EmptyIterator<E> get()

Gets a singleton instance of the empty iterator.

Type Parameters:

E - The type of the objects (not) returned by the iterator.

Returns:

An instance of the iterator.

hasNext

public boolean hasNext()

Always returns false, since this iterator is empty.

Specified by:

hasNext in interface Iterator<E>

See Also:

Iterator.hasNext()

next

public E next()

Always throws a NoSuchElementException.

Specified by:

next in interface Iterator<E>

See Also:

Iterator.next()

remove

public void remove()

Throws a UnsupportedOperationException.

Specified by:

remove in interface Iterator<E>

See Also:

Iterator.remove()

iterator

public Iterator<E> iterator()

Specified by:

iterator in interface Iterable<E>