org.eclipse.rdf4j.repository.sparql.federation

Class SPARQLCrossProductIteration

java.lang.Object

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

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

org.eclipse.rdf4j.repository.sparql.federation.SPARQLCrossProductIteration

All Implemented Interfaces:

AutoCloseable, org.eclipse.rdf4j.common.iteration.CloseableIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException>, org.eclipse.rdf4j.common.iteration.Iteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException>

public class SPARQLCrossProductIteration
extends org.eclipse.rdf4j.common.iteration.LookAheadIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException>

Iteration which forms the cross product of a list of materialized input bindings with each result obtained from the inner iteration. Example: inputBindings := {b1, b2, ...} resultIteration := {r1, r2, ...} getNextElement() returns (r1,b1), (r1, b2), ..., (r2, b1), (r2, b2), ... i.e. compute the cross product per result binding Note that this class is a fully equivalent copy of org.eclipse.rdf4j.query.algebra.evaluation.iterator.CrossProductIteration, and is only included here to avoid a circular dependency between the algebra-evaluation module and the sparql-repository module.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field and Description
protected org.eclipse.rdf4j.query.BindingSet	currentInputBinding
protected List<org.eclipse.rdf4j.query.BindingSet>	inputBindings
protected Iterator<org.eclipse.rdf4j.query.BindingSet>	inputBindingsIterator
protected org.eclipse.rdf4j.common.iteration.CloseableIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException>	resultIteration

Constructor Summary

Constructors

Constructor and Description
SPARQLCrossProductIteration(org.eclipse.rdf4j.common.iteration.CloseableIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException> resultIteration, List<org.eclipse.rdf4j.query.BindingSet> inputBindings)

Method Summary

Modifier and Type	Method and Description
protected org.eclipse.rdf4j.query.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

Field Detail

inputBindings

protected final List<org.eclipse.rdf4j.query.BindingSet> inputBindings

resultIteration

protected final org.eclipse.rdf4j.common.iteration.CloseableIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException> resultIteration

inputBindingsIterator

protected Iterator<org.eclipse.rdf4j.query.BindingSet> inputBindingsIterator

currentInputBinding

protected org.eclipse.rdf4j.query.BindingSet currentInputBinding

Constructor Detail

SPARQLCrossProductIteration

public SPARQLCrossProductIteration(org.eclipse.rdf4j.common.iteration.CloseableIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException> resultIteration,
                                   List<org.eclipse.rdf4j.query.BindingSet> inputBindings)

Method Detail

getNextElement

protected org.eclipse.rdf4j.query.BindingSet getNextElement()
                                                     throws org.eclipse.rdf4j.query.QueryEvaluationException

Specified by:

getNextElement in class org.eclipse.rdf4j.common.iteration.LookAheadIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException>

Throws:

org.eclipse.rdf4j.query.QueryEvaluationException

handleClose

protected void handleClose()
                    throws org.eclipse.rdf4j.query.QueryEvaluationException

Overrides:

handleClose in class org.eclipse.rdf4j.common.iteration.LookAheadIteration<org.eclipse.rdf4j.query.BindingSet,org.eclipse.rdf4j.query.QueryEvaluationException>

Throws:

org.eclipse.rdf4j.query.QueryEvaluationException