Class DefaultEvaluationStrategy.ResultSizeCountingIterator

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<BindingSet, QueryEvaluationException>

org.eclipse.rdf4j.common.iteration.IterationWrapper<BindingSet, QueryEvaluationException>

org.eclipse.rdf4j.query.algebra.evaluation.impl.DefaultEvaluationStrategy.ResultSizeCountingIterator

All Implemented Interfaces:

AutoCloseable, CloseableIteration<BindingSet, QueryEvaluationException>, Iteration<BindingSet, QueryEvaluationException>

Enclosing class:

DefaultEvaluationStrategy

private static class DefaultEvaluationStrategy.ResultSizeCountingIterator
extends IterationWrapper<BindingSet, QueryEvaluationException>

This class wraps an iterator and increments the "resultSizeActual" of the query model node that the iterator represents. This means we can track the number of tuples that have been retrieved from this node.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) CloseableIteration<BindingSet, QueryEvaluationException>	iterator
(package private) QueryModelNode	queryModelNode

Fields inherited from class IterationWrapper

wrappedIter

Constructor Summary

Constructors

Constructor	Description
ResultSizeCountingIterator(CloseableIteration<BindingSet, QueryEvaluationException> iterator, QueryModelNode queryModelNode)

Method Summary

Modifier and Type	Method	Description
boolean	hasNext()	Checks whether the wrapped Iteration contains more elements, closing this Iteration when this is not the case.
BindingSet	next()	Returns the next element from the wrapped Iteration.

Methods inherited from class IterationWrapper

handleClose, remove

Methods inherited from class AbstractCloseableIteration

close, isClosed

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface CloseableIteration

stream

Field Details

iterator

CloseableIteration<BindingSet, QueryEvaluationException> iterator

queryModelNode

QueryModelNode queryModelNode

Constructor Details

ResultSizeCountingIterator

public ResultSizeCountingIterator(CloseableIteration<BindingSet, QueryEvaluationException> iterator,
 QueryModelNode queryModelNode)

Method Details

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Description copied from class: IterationWrapper

Checks whether the wrapped Iteration contains more elements, closing this Iteration when this is not the case.

Specified by:

hasNext in interface Iteration<BindingSet, QueryEvaluationException>

Overrides:

hasNext in class IterationWrapper<BindingSet, QueryEvaluationException>

Returns:

true if the wrapped Iteration contains more elements, false otherwise.

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Description copied from class: IterationWrapper

Returns the next element from the wrapped Iteration.

Specified by:

next in interface Iteration<BindingSet, QueryEvaluationException>

Overrides:

next in class IterationWrapper<BindingSet, QueryEvaluationException>

Returns:

the next element in the iteration.

Throws:

QueryEvaluationException