Class GroupIterator
- java.lang.Object
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- org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>
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- org.eclipse.rdf4j.common.iteration.CloseableIteratorIteration<BindingSet,QueryEvaluationException>
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- org.eclipse.rdf4j.query.algebra.evaluation.iterator.GroupIterator
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- All Implemented Interfaces:
AutoCloseable,CloseableIteration<BindingSet,QueryEvaluationException>,Iteration<BindingSet,QueryEvaluationException>
public class GroupIterator extends CloseableIteratorIteration<BindingSet,QueryEvaluationException>
- Author:
- David Huynh, Arjohn Kampman, Jeen Broekstra, James Leigh, Jerven Bolleman
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected classGroupIterator.KeyA unique key for a set of existing bindings.
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Constructor Summary
Constructors Constructor Description GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parentBindings, long iterationCacheSyncThreshold, QueryEvaluationContext context)GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parentBindings, QueryEvaluationContext context)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected voidhandleClose()Called byAbstractCloseableIteration.close()when it is called for the first time.booleanhasNext()Returns true if the iteration has more elements.BindingSetnext()Returns the next element in the iteration.-
Methods inherited from class org.eclipse.rdf4j.common.iteration.CloseableIteratorIteration
hasIterator, remove, setIterator
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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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GroupIterator
public GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parentBindings, QueryEvaluationContext context) throws QueryEvaluationException
- Throws:
QueryEvaluationException
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GroupIterator
public GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parentBindings, long iterationCacheSyncThreshold, QueryEvaluationContext context) throws QueryEvaluationException
- Throws:
QueryEvaluationException
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Method Detail
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hasNext
public boolean hasNext() throws QueryEvaluationExceptionDescription copied from interface:IterationReturns true if the iteration has more elements. (In other words, returns true ifIteration.next()would return an element rather than throwing a NoSuchElementException.)- Specified by:
hasNextin interfaceIteration<BindingSet,QueryEvaluationException>- Overrides:
hasNextin classCloseableIteratorIteration<BindingSet,QueryEvaluationException>- Returns:
- true if the iteration has more elements.
- Throws:
QueryEvaluationException
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next
public BindingSet next() throws QueryEvaluationException
Description copied from interface:IterationReturns the next element in the iteration.- Specified by:
nextin interfaceIteration<BindingSet,QueryEvaluationException>- Overrides:
nextin classCloseableIteratorIteration<BindingSet,QueryEvaluationException>- Returns:
- the next element in the iteration.
- 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 classAbstractCloseableIteration<BindingSet,QueryEvaluationException>- Throws:
QueryEvaluationException
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