org.jrdf.graph.mem.iterator
Class TwoFixedIterator

java.lang.Object
  org.jrdf.graph.mem.iterator.TwoFixedIterator

All Implemented Interfaces:

Iterator<Triple>, ClosableMemIterator<Triple>, ClosableIterator<Triple>

public final class TwoFixedIterator
extends Object
implements ClosableMemIterator<Triple>

An iterator that iterates over a group with a two fixed nodes. Relies on an internal iterator which iterates over all entries in a set, found in a subIndex.

The thirdIndexIterator is used to indicate the current position. It will always be set to return the next value until it reaches the end of the group.

Version:

$Revision: 1045 $

Author:

Paul Gearon, Andrew Newman

Method Summary

boolean	close() Closes the iterator by freeing any resources that it current holds.
boolean	containsHandler(GraphHandler012 handler012, GraphHandler201 handler201, GraphHandler120 handler120) Return true if this iterator contains any of the handlers.
boolean	hasNext()
Triple	next()
void	remove()

Methods inherited from class java.lang.Object

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

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Triple>

next

public Triple next()
            throws NoSuchElementException

Specified by:

next in interface Iterator<Triple>

Throws:

NoSuchElementException

remove

public void remove()

Specified by:

remove in interface Iterator<Triple>

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.

containsHandler

public boolean containsHandler(GraphHandler012 handler012,
                               GraphHandler201 handler201,
                               GraphHandler120 handler120)

Description copied from interface: ClosableMemIterator

Return true if this iterator contains any of the handlers.

Specified by:

containsHandler in interface ClosableMemIterator<Triple>

Parameters:

handler012 - the 012 handler

handler201 - the 201 handler

handler120 - the 120 handler

Returns:

true if this iterator contains any of the given handlers.