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

Class QueryEvaluationStep.DelayedEvaluationIteration

java.lang.Object

org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>

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

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

All Implemented Interfaces:

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

Enclosing interface:

QueryEvaluationStep

public static class QueryEvaluationStep.DelayedEvaluationIteration
extends DelayedIteration<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 Iteration<? extends BindingSet,? extends QueryEvaluationException>	createIteration()	Creates the iteration that should be iterated over.

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

handleClose, hasNext, next, remove

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 Details

DelayedEvaluationIteration

public DelayedEvaluationIteration(QueryEvaluationStep arg,
 BindingSet bs)

Method Details

createIteration

protected Iteration<? extends BindingSet,? extends QueryEvaluationException> createIteration()
                                                                                      throws QueryEvaluationException

Description copied from class: DelayedIteration

Creates the iteration that should be iterated over. This method is called only once, when the iteration is first needed.

Specified by:

createIteration in class DelayedIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException