org.eclipse.rdf4j.sail.federation.evaluation

Class ParallelLeftJoinCursor

java.lang.Object

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

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

org.eclipse.rdf4j.sail.federation.evaluation.ParallelLeftJoinCursor

All Implemented Interfaces:

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

public class ParallelLeftJoinCursor
extends LookAheadIteration<BindingSet,QueryEvaluationException>
implements Runnable

Transform the condition into a filter and the right side into an AlternativeCursor, then evaluate as a ParallelJoinCursor.

Author:

James Leigh

Constructor Summary

Constructors

Constructor and Description
ParallelLeftJoinCursor(EvaluationStrategy strategy, LeftJoin join, BindingSet bindings)

Method Summary

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

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, wait, wait, wait

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

stream

Constructor Detail

ParallelLeftJoinCursor

public ParallelLeftJoinCursor(EvaluationStrategy strategy,
                              LeftJoin join,
                              BindingSet bindings)
                       throws QueryEvaluationException

Throws:

QueryEvaluationException

Method Detail

run

public void run()

Specified by:

run in interface Runnable

getNextElement

public 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

public 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

toString

public String toString()

Overrides:

toString in class Object