Class PathIteration
- java.lang.Object
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- org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E>
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- org.eclipse.rdf4j.common.iteration.LookAheadIteration<BindingSet>
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- org.eclipse.rdf4j.query.algebra.evaluation.iterator.PathIteration
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- All Implemented Interfaces:
AutoCloseable,Iterator<BindingSet>,CloseableIteration<BindingSet>
public class PathIteration extends LookAheadIteration<BindingSet>
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected static classPathIteration.ValuePair
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Constructor Summary
Constructors Constructor Description PathIteration(EvaluationStrategy strategy, StatementPattern.Scope scope, Var startVar, TupleExpr pathExpression, Var endVar, Var contextVar, long minLength, BindingSet bindings)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected booleanadd(Set<PathIteration.ValuePair> valueSet, PathIteration.ValuePair vp)protected booleanaddToQueue(Queue<PathIteration.ValuePair> valueQueue2, PathIteration.ValuePair vp)protected BindingSetgetNextElement()Gets the next element.protected voidhandleClose()Called byAbstractCloseableIteration.close()when it is called for the first time.protected booleanisUnbound(Var var, BindingSet bindings)-
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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Methods inherited from interface java.util.Iterator
forEachRemaining
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Constructor Detail
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PathIteration
public PathIteration(EvaluationStrategy strategy, StatementPattern.Scope scope, Var startVar, TupleExpr pathExpression, Var endVar, Var contextVar, long minLength, BindingSet bindings) throws QueryEvaluationException
- Throws:
QueryEvaluationException
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Method Detail
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getNextElement
protected BindingSet getNextElement() throws QueryEvaluationException
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
protected void handleClose() throws QueryEvaluationExceptionDescription 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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addToQueue
protected boolean addToQueue(Queue<PathIteration.ValuePair> valueQueue2, PathIteration.ValuePair vp) throws QueryEvaluationException
- Parameters:
valueQueue2-vp-- Throws:
QueryEvaluationException
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add
protected boolean add(Set<PathIteration.ValuePair> valueSet, PathIteration.ValuePair vp) throws QueryEvaluationException
- Parameters:
valueSet-vp-- Throws:
QueryEvaluationException
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isUnbound
protected boolean isUnbound(Var var, BindingSet bindings)
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