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

Class DelayedEvaluationIteration

java.lang.Object

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

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

All Implemented Interfaces:

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

public class DelayedEvaluationIteration
extends AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Utility class that removes code duplication and makes a precompiled QueryEvaluationStep available as an iteration that may be created and used later.

Constructor Summary

Constructors

Constructor	Description
DelayedEvaluationIteration(QueryEvaluationStep arg, BindingSet bs)

Method Summary

Modifier and Type	Method	Description
protected CloseableIteration<BindingSet,QueryEvaluationException>	createIteration()
protected void	handleClose()	Closes this iteration as well as the underlying iteration if it has already been created and happens to be a CloseableIteration.
boolean	hasNext()	Calls the hasNext method of the underlying iteration.
BindingSet	next()	Calls the next method of the underlying iteration.
void	remove()	Calls the remove method of the underlying iteration.

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.CloseableIteration

stream

Constructor Detail

DelayedEvaluationIteration

public DelayedEvaluationIteration(QueryEvaluationStep arg,
                                  BindingSet bs)

Method Detail

createIteration

protected CloseableIteration<BindingSet,QueryEvaluationException> createIteration()
                                                                                 throws QueryEvaluationException

Throws:

QueryEvaluationException

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Calls the hasNext method of the underlying iteration.

Returns:

true if the iteration has more elements.

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Calls the next method of the underlying iteration.

Returns:

the next element in the iteration.

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

Calls the remove method of the underlying iteration.

Throws:

QueryEvaluationException

handleClose

protected final void handleClose()
                          throws QueryEvaluationException

Closes this iteration as well as the underlying iteration if it has already been created and happens to be a CloseableIteration.

Overrides:

handleClose in class AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException