org.eclipse.rdf4j.query.algebra.evaluation.iterator

Class QueryContextIteration

java.lang.Object

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

org.eclipse.rdf4j.query.algebra.evaluation.iterator.QueryContextIteration

All Implemented Interfaces:

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

public class QueryContextIteration
extends AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Makes a QueryContext available during iteration.

Constructor Summary

Constructors

Constructor and Description
QueryContextIteration(CloseableIteration<? extends BindingSet,QueryEvaluationException> iter, QueryContext queryContext)

Method Summary

Modifier and Type	Method and Description
void	handleClose() Called by AbstractCloseableIteration.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.
void	remove() Removes from the underlying collection the last element returned by the iteration (optional operation).

Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration

close, isClosed

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.common.iteration.Iteration

stream

Constructor Detail

QueryContextIteration

public QueryContextIteration(CloseableIteration<? extends BindingSet,QueryEvaluationException> iter,
                             QueryContext queryContext)

Method Detail

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns true if the iteration has more elements. (In other words, returns true if Iteration.next() would return an element rather than throwing a NoSuchElementException.)

Returns:

true if the iteration has more elements.

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns the next element in the iteration.

Returns:

the next element in the iteration.

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

Description copied from interface: Iteration

Removes from the underlying collection the last element returned by the iteration (optional operation). This method can be called only once per call to next.

Throws:

QueryEvaluationException

handleClose

public void handleClose()
                 throws QueryEvaluationException

Description copied from class: AbstractCloseableIteration

Called by AbstractCloseableIteration.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 class AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException