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

Class BadlyDesignedLeftJoinIterator

java.lang.Object

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

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

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

All Implemented Interfaces:

AutoCloseable, Iterator<BindingSet>, CloseableIteration<BindingSet>

public class BadlyDesignedLeftJoinIterator
extends LookAheadIteration<BindingSet>

Author:

Arjohn Kampman

Field Summary

Fields inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration

EMPTY_STATEMENT_ITERATION

Constructor Summary

Constructors

Constructor	Description
BadlyDesignedLeftJoinIterator(EvaluationStrategy strategy, LeftJoin join, BindingSet inputBindings, Set<String> problemVars, QueryEvaluationStep rightEvaluationStep)
BadlyDesignedLeftJoinIterator(QueryEvaluationStep left, BindingSet inputBindings, Set<String> problemVars, QueryEvaluationStep rightEvaluationStep)

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 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.CloseableIteration

stream

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Details

BadlyDesignedLeftJoinIterator

public BadlyDesignedLeftJoinIterator(EvaluationStrategy strategy,
 LeftJoin join,
 BindingSet inputBindings,
 Set<String> problemVars,
 QueryEvaluationStep rightEvaluationStep)
                              throws QueryEvaluationException

Throws:

QueryEvaluationException

BadlyDesignedLeftJoinIterator

public BadlyDesignedLeftJoinIterator(QueryEvaluationStep left,
 BindingSet inputBindings,
 Set<String> problemVars,
 QueryEvaluationStep rightEvaluationStep)
                              throws QueryEvaluationException

Throws:

QueryEvaluationException

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>

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.

Specified by:

handleClose in class AbstractCloseableIteration<BindingSet>

Throws:

QueryEvaluationException