Class LeftJoinIterator
- java.lang.Object
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- org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>
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- org.eclipse.rdf4j.common.iteration.LookAheadIteration<BindingSet,QueryEvaluationException>
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- org.eclipse.rdf4j.query.algebra.evaluation.iterator.LeftJoinIterator
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- All Implemented Interfaces:
AutoCloseable
,CloseableIteration<BindingSet,QueryEvaluationException>
,Iteration<BindingSet,QueryEvaluationException>
- Direct Known Subclasses:
BadlyDesignedLeftJoinIterator
public class LeftJoinIterator extends LookAheadIteration<BindingSet,QueryEvaluationException>
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Constructor Summary
Constructors Constructor Description LeftJoinIterator(EvaluationStrategy strategy, LeftJoin join, BindingSet bindings, QueryEvaluationContext context)
LeftJoinIterator(QueryEvaluationStep left, QueryEvaluationStep right, QueryValueEvaluationStep joinCondition, BindingSet bindings, Set<String> scopeBindingNamse)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected BindingSet
getNextElement()
Gets the next element.protected void
handleClose()
Called byAbstractCloseableIteration.close()
when it is called for the first time.-
Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration
hasNext, next, remove
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Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration
close, isClosed
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration
stream
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Constructor Detail
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LeftJoinIterator
public LeftJoinIterator(EvaluationStrategy strategy, LeftJoin join, BindingSet bindings, QueryEvaluationContext context) throws QueryEvaluationException
- Throws:
QueryEvaluationException
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LeftJoinIterator
public LeftJoinIterator(QueryEvaluationStep left, QueryEvaluationStep right, QueryValueEvaluationStep joinCondition, BindingSet bindings, Set<String> scopeBindingNamse) throws QueryEvaluationException
- Throws:
QueryEvaluationException
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Method Detail
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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 classLookAheadIteration<BindingSet,QueryEvaluationException>
- Returns:
- The next element, or null if no more elements are available.
- Throws:
QueryEvaluationException
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handleClose
protected void handleClose() throws QueryEvaluationException
Description copied from class:AbstractCloseableIteration
Called byAbstractCloseableIteration.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 classLookAheadIteration<BindingSet,QueryEvaluationException>
- Throws:
QueryEvaluationException
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