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

Class ZeroLengthPathIteration

java.lang.Object

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

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

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

All Implemented Interfaces:

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

Direct Known Subclasses:

LimitedSizeZeroLengthPathIteration

public class ZeroLengthPathIteration
extends LookAheadIteration<BindingSet,QueryEvaluationException>

Constructor Summary

Constructors

Constructor and Description
ZeroLengthPathIteration(EvaluationStrategy evaluationStrategyImpl, Var subjectVar, Var objVar, Value subj, Value obj, Var contextVar, BindingSet bindings)

Method Summary

Modifier and Type	Method and Description
protected boolean	add(Set<Value> reportedValues2, Value v) add param v to the set reportedValues2
Var	createAnonVar(String varName)
protected BindingSet	getNextElement() Gets the next element.

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

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

Constructor Detail

ZeroLengthPathIteration

public ZeroLengthPathIteration(EvaluationStrategy evaluationStrategyImpl,
                               Var subjectVar,
                               Var objVar,
                               Value subj,
                               Value obj,
                               Var contextVar,
                               BindingSet bindings)

Method Detail

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 class LookAheadIteration<BindingSet,QueryEvaluationException>

Returns:

The next element, or null if no more elements are available.

Throws:

QueryEvaluationException

add

protected boolean add(Set<Value> reportedValues2,
                      Value v)
               throws QueryEvaluationException

add param v to the set reportedValues2

Parameters:

reportedValues2 -

v -

Returns:

true if v added to set and not yet present

Throws:

QueryEvaluationException

createAnonVar

public Var createAnonVar(String varName)