org.jrdf.graph.local.iterator
Class EmptyClosableIterator

java.lang.Object
  org.jrdf.graph.local.iterator.EmptyClosableIterator

All Implemented Interfaces:

Iterator<Triple>, ClosableIterator<Triple>

public final class EmptyClosableIterator
extends Object
implements ClosableIterator<Triple>

An iterator that returns no triples.

Version:

$Revision: 1806 $

Author:

Andrew Newman

Constructor Summary

EmptyClosableIterator()

Method Summary

boolean	close() Closes the iterator by freeing any resources that it current holds.
boolean	hasNext() Returns false.
Triple	next() Never returns anything.
void	remove() Not supported by this implementation.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyClosableIterator

public EmptyClosableIterator()

Method Detail

hasNext

public boolean hasNext()

Returns false.

Specified by:

hasNext in interface Iterator<Triple>

Returns:

false.

next

public Triple next()
            throws NoSuchElementException

Never returns anything. A call to this will throw NoSuchElementException.

Specified by:

next in interface Iterator<Triple>

Returns:

will not return.

Throws:

NoSuchElementException - always.

remove

public void remove()

Not supported by this implementation. A call to this will throw UnsupportedOperationException.

Specified by:

remove in interface Iterator<Triple>

Throws:

UnsupportedOperationException - always.

close

public boolean close()

Description copied from interface: ClosableIterator

Closes the iterator by freeing any resources that it current holds.

This must be done as soon as possible. Once an iterator is closed none of the operations on a iterator will operate i.e. they will throw an exception.

Specified by:

close in interface ClosableIterator<Triple>

Returns:

true if it was successfully closed.