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
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected class
GroupIterator.Key
A unique key for a set of existing bindings.
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Constructor Summary
Constructors Constructor Description GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parentBindings)
GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parentBindings, long iterationCacheSyncThreshold)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
handleClose()
Called byAbstractCloseableIteration.close()
when it is called for the first time.boolean
hasNext()
Returns true if the iteration has more elements.BindingSet
next()
Returns the next element in the iteration.-
Methods inherited from class org.eclipse.rdf4j.common.iteration.CloseableIteratorIteration
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) throws QueryEvaluationException
- Throws:
QueryEvaluationException
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GroupIterator
public GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parentBindings, long iterationCacheSyncThreshold) throws QueryEvaluationException
- Throws:
QueryEvaluationException
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Method Detail
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hasNext
public boolean hasNext() throws QueryEvaluationException
Description copied from interface:Iteration
Returns 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:
hasNext
in interfaceIteration<BindingSet,QueryEvaluationException>
- Overrides:
hasNext
in 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:Iteration
Returns the next element in the iteration.- Specified by:
next
in interfaceIteration<BindingSet,QueryEvaluationException>
- Overrides:
next
in classCloseableIteratorIteration<BindingSet,QueryEvaluationException>
- Returns:
- the next element in the iteration.
- Throws:
QueryEvaluationException
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handleClose
protected void handleClose() throws QueryEvaluationException
Description copied from class:AbstractCloseableIteration
Called 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:
handleClose
in classAbstractCloseableIteration<BindingSet,QueryEvaluationException>
- Throws:
QueryEvaluationException
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