Class AlternativeCursor<E>
- 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<E,QueryEvaluationException>
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- org.eclipse.rdf4j.sail.federation.evaluation.AlternativeCursor<E>
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- All Implemented Interfaces:
AutoCloseable,CloseableIteration<E,QueryEvaluationException>,Iteration<E,QueryEvaluationException>
public class AlternativeCursor<E> extends LookAheadIteration<E,QueryEvaluationException>
If the primary cursor is empty, use the alternative cursor.- Author:
- James Leigh
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Constructor Summary
Constructors Constructor Description AlternativeCursor(CloseableIteration<? extends E,QueryEvaluationException> primary, CloseableIteration<? extends E,QueryEvaluationException> alternative)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description EgetNextElement()Gets the next element.voidhandleClose()Called byAbstractCloseableIteration.close()when it is called for the first time.StringtoString()-
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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Constructor Detail
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AlternativeCursor
public AlternativeCursor(CloseableIteration<? extends E,QueryEvaluationException> primary, CloseableIteration<? extends E,QueryEvaluationException> alternative)
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Method Detail
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handleClose
public 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.- Overrides:
handleClosein classLookAheadIteration<E,QueryEvaluationException>- Throws:
QueryEvaluationException
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getNextElement
public E 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<E,QueryEvaluationException>- Returns:
- The next element, or null if no more elements are available.
- Throws:
QueryEvaluationException
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