Class DescribeIteration
- 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.DescribeIteration
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- All Implemented Interfaces:
AutoCloseable
,CloseableIteration<BindingSet,QueryEvaluationException>
,Iteration<BindingSet,QueryEvaluationException>
public class DescribeIteration extends LookAheadIteration<BindingSet,QueryEvaluationException>
Iteration that implements a simplified version of Symmetric Concise Bounded Description (omitting reified statements).- Author:
- Jeen Broekstra
- See Also:
- Concise Bounded Description - alternatives
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Constructor Summary
Constructors Constructor Description DescribeIteration(Iteration<BindingSet,QueryEvaluationException> sourceIter, EvaluationStrategy strategy, Set<String> describeExprNames, BindingSet parentBindings)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected BindingSet
getNextElement()
Gets the next element.-
Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration
handleClose, 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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DescribeIteration
public DescribeIteration(Iteration<BindingSet,QueryEvaluationException> sourceIter, EvaluationStrategy strategy, Set<String> describeExprNames, BindingSet parentBindings)
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Method Detail
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getNextElement
protected BindingSet getNextElement() throws QueryEvaluationException
Description copied from class:LookAheadIteration
Gets the next element. Subclasses should implement this method so that it returns the next element.- Specified by:
getNextElement
in classLookAheadIteration<BindingSet,QueryEvaluationException>
- Returns:
- The next element, or null if no more elements are available.
- Throws:
QueryEvaluationException
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