Class MultiProjectionIterator

java.lang.Object

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

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

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

All Implemented Interfaces:

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

public class MultiProjectionIterator
extends LookAheadIteration<BindingSet, QueryEvaluationException>

Field Summary

Fields

Modifier and Type	Field	Description
private BindingSet	currentBindings
private final CloseableIteration<BindingSet, QueryEvaluationException>	iter
private int	nextProjectionIdx
private final BindingSet	parentBindings
private final BindingSet[]	previousBindings
private final List<ProjectionElemList>	projections

Constructor Summary

Constructors

Constructor	Description
MultiProjectionIterator(MultiProjection multiProjection, CloseableIteration<BindingSet, QueryEvaluationException> iter, BindingSet bindings)

Method Summary

Modifier and Type	Method	Description
protected BindingSet	getNextElement()	Gets the next element.
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.

Methods inherited from class LookAheadIteration

hasNext, next, remove

Methods inherited from class AbstractCloseableIteration

close, isClosed

Methods inherited from class Object

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

Methods inherited from interface CloseableIteration

stream

Field Details

projections

private final List<ProjectionElemList> projections

iter

private final CloseableIteration<BindingSet, QueryEvaluationException> iter

parentBindings

private final BindingSet parentBindings

previousBindings

private final BindingSet[] previousBindings

currentBindings

private BindingSet currentBindings

nextProjectionIdx

private int nextProjectionIdx

Constructor Details

MultiProjectionIterator

public MultiProjectionIterator(MultiProjection multiProjection,
 CloseableIteration<BindingSet, QueryEvaluationException> iter,
 BindingSet bindings)

Method Details

getNextElement

protected BindingSet getNextElement()
                             throws QueryEvaluationException

Description copied from class: LookAheadIteration

Gets the next element. Subclasses should implement this method so that it returns the next element.

Specified by:

getNextElement in class LookAheadIteration<BindingSet, QueryEvaluationException>

Returns:

The next element, or null if no more elements are available.

Throws:

QueryEvaluationException

handleClose

protected void handleClose()
                    throws QueryEvaluationException

Description copied from class: AbstractCloseableIteration

Called by AbstractCloseableIteration.close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.

Overrides:

handleClose in class LookAheadIteration<BindingSet, QueryEvaluationException>

Throws:

QueryEvaluationException