Package 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	Description
EmptyIterator()

Method Summary

Modifier and Type	Method	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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Details

EmptyIterator

public EmptyIterator()

Method Details

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>