Class MultiProjectionIterator
- 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.MultiProjectionIterator
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- All Implemented Interfaces:
java.lang.AutoCloseable,CloseableIteration<BindingSet,QueryEvaluationException>,Iteration<BindingSet,QueryEvaluationException>
public class MultiProjectionIterator extends LookAheadIteration<BindingSet,QueryEvaluationException>
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Field Summary
Fields Modifier and Type Field Description private BindingSetcurrentBindingsprivate CloseableIteration<BindingSet,QueryEvaluationException>iterprivate intnextProjectionIdxprivate BindingSetparentBindingsprivate BindingSet[]previousBindingsprivate java.util.List<ProjectionElemList>projections
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Constructor Summary
Constructors Constructor Description MultiProjectionIterator(MultiProjection multiProjection, CloseableIteration<BindingSet,QueryEvaluationException> iter, BindingSet bindings)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected BindingSetgetNextElement()Gets the next element.protected voidhandleClose()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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Field Detail
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projections
private final java.util.List<ProjectionElemList> projections
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iter
private final CloseableIteration<BindingSet,QueryEvaluationException> iter
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parentBindings
private final BindingSet parentBindings
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previousBindings
private final BindingSet[] previousBindings
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currentBindings
private BindingSet currentBindings
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nextProjectionIdx
private int nextProjectionIdx
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Constructor Detail
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MultiProjectionIterator
public MultiProjectionIterator(MultiProjection multiProjection, CloseableIteration<BindingSet,QueryEvaluationException> iter, BindingSet bindings)
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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,QueryEvaluationException>- 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.- Overrides:
handleClosein classLookAheadIteration<BindingSet,QueryEvaluationException>- Throws:
QueryEvaluationException
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