org.jrdf.graph.local.iterator
Class ResourceIterator<E>

java.lang.Object
  org.jrdf.graph.local.iterator.ResourceIterator<E>

All Implemented Interfaces:

Iterator<E>, ClosableIterator<E>

Direct Known Subclasses:

AnyResourceIterator, URIReferenceResourceIterator

public abstract class ResourceIterator<E>
extends Object
implements ClosableIterator<E>

Field Summary

protected boolean	firstTime
protected Iterator<Map.Entry<Long,Map<Long,Set<Long>>>>	iterator012
protected Iterator<Map.Entry<Long,Map<Long,Set<Long>>>>	iterator201
protected LongIndex	longIndex012
protected Resource	nextResource
protected NodePool	nodePool
protected ResourceFactory	resourceFactory

Constructor Summary

ResourceIterator(LongIndex[] newLongIndexes, ResourceFactory newResourceFactory, NodePool newNodePool)

Method Summary

boolean	close() Closes the iterator by freeing any resources that it current holds.
protected abstract long	getNextNodeId(Iterator<Map.Entry<Long,Map<Long,Set<Long>>>> iterator) Provides a customizable way in which to filter out resource nodes based on type.
protected Resource	getNextResource()
boolean	hasNext()
void	remove()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

next

Field Detail

longIndex012

protected final LongIndex longIndex012

resourceFactory

protected final ResourceFactory resourceFactory

iterator012

protected Iterator<Map.Entry<Long,Map<Long,Set<Long>>>> iterator012

iterator201

protected Iterator<Map.Entry<Long,Map<Long,Set<Long>>>> iterator201

nextResource

protected Resource nextResource

firstTime

protected boolean firstTime

nodePool

protected NodePool nodePool

Constructor Detail

ResourceIterator

public ResourceIterator(LongIndex[] newLongIndexes,
                        ResourceFactory newResourceFactory,
                        NodePool newNodePool)

Method Detail

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<E>

Returns:

true if it was successfully closed.

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<E>

remove

public void remove()

Specified by:

remove in interface Iterator<E>

getNextResource

protected Resource getNextResource()

getNextNodeId

protected abstract long getNextNodeId(Iterator<Map.Entry<Long,Map<Long,Set<Long>>>> iterator)

Provides a customizable way in which to filter out resource nodes based on type.

Parameters:

iterator - iterators over the index.

Returns:

the next node identifier.