org.eclipse.rdf4j.query.algebra.evaluation.iterator

Class JoinIterator

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>

org.eclipse.rdf4j.common.iteration.LookAheadIteration<BindingSet,QueryEvaluationException>

org.eclipse.rdf4j.query.algebra.evaluation.iterator.JoinIterator

All Implemented Interfaces:

AutoCloseable, CloseableIteration<BindingSet,QueryEvaluationException>, Iteration<BindingSet,QueryEvaluationException>

public class JoinIterator
extends LookAheadIteration<BindingSet,QueryEvaluationException>

Interleaved join iterator. This join iterator produces results by interleaving results from its left argument into its right argument to speed up bindings and produce fail-fast results. Note that this join strategy is only valid in cases where all bindings from the left argument can be considered in scope for the right argument.

Author:

Jeen Broekstra

Constructor Summary

Constructors

Constructor and Description
JoinIterator(EvaluationStrategy strategy, Join join, BindingSet bindings)

Method Summary

Modifier and Type	Method and Description
protected BindingSet	getNextElement()
protected void	handleClose()

Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration

hasNext, next, remove

Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration

close, isClosed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.common.iteration.Iteration

stream

Constructor Detail

JoinIterator

public JoinIterator(EvaluationStrategy strategy,
                    Join join,
                    BindingSet bindings)
             throws QueryEvaluationException

Throws:

QueryEvaluationException

Method Detail

getNextElement

protected BindingSet getNextElement()
                             throws QueryEvaluationException

Specified by:

getNextElement in class LookAheadIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException

handleClose

protected void handleClose()
                    throws QueryEvaluationException

Overrides:

handleClose in class LookAheadIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException