Class LeftJoinIterator
java.lang.Object
org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<BindingSet>
org.eclipse.rdf4j.common.iteration.LookAheadIteration<BindingSet>
org.eclipse.rdf4j.query.algebra.evaluation.iterator.LeftJoinIterator
- All Implemented Interfaces:
AutoCloseable, Iterator<BindingSet>, CloseableIteration<BindingSet>
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Field Summary
Fields inherited from interface CloseableIteration
EMPTY_STATEMENT_ITERATION -
Constructor Summary
ConstructorsConstructorDescriptionLeftJoinIterator(CloseableIteration<BindingSet> leftIter, QueryEvaluationStep rightEvaluationStep) LeftJoinIterator(EvaluationStrategy strategy, LeftJoin join, BindingSet bindings, QueryEvaluationStep rightEvaluationStep) LeftJoinIterator(QueryEvaluationStep left, BindingSet bindings, QueryEvaluationStep rightEvaluationStep) -
Method Summary
Modifier and TypeMethodDescriptionstatic CloseableIteration<BindingSet> getInstance(QueryEvaluationStep left, BindingSet bindings, QueryEvaluationStep rightEvaluationStep) protected BindingSetGets the next element.protected voidCalled byAbstractCloseableIteration.close()when it is called for the first time.Methods inherited from class LookAheadIteration
hasNext, next, removeModifier and TypeMethodDescriptionfinal booleanhasNext()final BindingSetnext()voidremove()Throws anUnsupportedOperationException.Methods inherited from class AbstractCloseableIteration
close, isClosedModifier and TypeMethodDescriptionfinal voidclose()CallsAbstractCloseableIteration.handleClose()upon first call and makes sure the resource closures are only executed once.final booleanisClosed()Checks whether this CloseableIteration has been closed.Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface CloseableIteration
streamModifier and TypeMethodDescriptiondefault Stream<BindingSet> stream()Convert the results to a Java 8 Stream.Methods inherited from interface Iterator
forEachRemaining
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Constructor Details
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LeftJoinIterator
public LeftJoinIterator(EvaluationStrategy strategy, LeftJoin join, BindingSet bindings, QueryEvaluationStep rightEvaluationStep) throws QueryEvaluationException - Throws:
QueryEvaluationException
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LeftJoinIterator
public LeftJoinIterator(QueryEvaluationStep left, BindingSet bindings, QueryEvaluationStep rightEvaluationStep) throws QueryEvaluationException - Throws:
QueryEvaluationException
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LeftJoinIterator
public LeftJoinIterator(CloseableIteration<BindingSet> leftIter, QueryEvaluationStep rightEvaluationStep)
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Method Details
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getInstance
public static CloseableIteration<BindingSet> getInstance(QueryEvaluationStep left, BindingSet bindings, QueryEvaluationStep rightEvaluationStep) -
getNextElement
Description copied from class:LookAheadIterationGets the next element. Subclasses should implement this method so that it returns the next element.- Specified by:
getNextElementin classLookAheadIteration<BindingSet>- Returns:
- The next element, or null if no more elements are available.
- Throws:
QueryEvaluationException
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handleClose
Description copied from class:AbstractCloseableIterationCalled 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.- Specified by:
handleClosein classAbstractCloseableIteration<BindingSet>- Throws:
QueryEvaluationException
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