Class ZeroLengthPathIteration

java.lang.Object

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

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>

public class ZeroLengthPathIteration
extends LookAheadIteration<BindingSet, QueryEvaluationException>

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ANON_OBJECT_VAR
static final String	ANON_PREDICATE_VAR
static final String	ANON_SEQUENCE_VAR
static final String	ANON_SUBJECT_VAR
private final BindingSet	bindings
private final QueryEvaluationContext	context
private final Var	contextVar
private final EvaluationStrategy	evaluationStrategy
private CloseableIteration<BindingSet, QueryEvaluationException>	iter
private final Value	obj
private static final Literal	OBJECT
private final QueryEvaluationStep	precompile
private Set<Value>	reportedValues
private QueryBindingSet	result
private final BiConsumer<Value, MutableBindingSet>	setContext
private final BiConsumer<Value, MutableBindingSet>	setObject
private final BiConsumer<Value, MutableBindingSet>	setSubject
private final Value	subj
private static final Literal	SUBJECT

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
Var	createAnonVar(String varName)
private CloseableIteration<BindingSet, QueryEvaluationException>	createIteration()
protected BindingSet	getNextElement()	Gets the next element.

Methods inherited from class LookAheadIteration

handleClose, hasNext, next, 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

OBJECT

private static final Literal OBJECT

SUBJECT

private static final Literal SUBJECT

ANON_SUBJECT_VAR

public static final String ANON_SUBJECT_VAR

See Also:

• Constant Field Values

ANON_PREDICATE_VAR

public static final String ANON_PREDICATE_VAR

See Also:

• Constant Field Values

ANON_OBJECT_VAR

public static final String ANON_OBJECT_VAR

See Also:

• Constant Field Values

ANON_SEQUENCE_VAR

public static final String ANON_SEQUENCE_VAR

See Also:

• Constant Field Values

result

private QueryBindingSet result

subj

private final Value subj

obj

private final Value obj

bindings

private final BindingSet bindings

iter

private CloseableIteration<BindingSet, QueryEvaluationException> iter

reportedValues

private Set<Value> reportedValues

contextVar

private final Var contextVar

evaluationStrategy

private final EvaluationStrategy evaluationStrategy

precompile

private final QueryEvaluationStep precompile

context

private final QueryEvaluationContext context

setSubject

private final BiConsumer<Value, MutableBindingSet> setSubject

setObject

private final BiConsumer<Value, MutableBindingSet> setObject

setContext

private final BiConsumer<Value, MutableBindingSet> setContext

Constructor Details

ZeroLengthPathIteration

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

Method Details

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

createIteration

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

Throws:

QueryEvaluationException

createAnonVar

public Var createAnonVar(String varName)