Class PathIteration
java.lang.Object
org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<BindingSet>
org.eclipse.rdf4j.common.iteration.LookAheadIteration<BindingSet>
org.eclipse.rdf4j.query.algebra.evaluation.iterator.PathIteration
- All Implemented Interfaces:
AutoCloseable
,Iterator<BindingSet>
,CloseableIteration<BindingSet>
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Nested Class Summary
Modifier and TypeClassDescriptionstatic class
A specialized BingingSet that can only hold the start and end values of a Path. -
Constructor Summary
ConstructorDescriptionPathIteration
(EvaluationStrategy strategy, StatementPattern.Scope scope, Var startVar, TupleExpr pathExpression, Var endVar, Var contextVar, long minLength, BindingSet bindings) -
Method Summary
Modifier and TypeMethodDescriptionprotected boolean
add
(Set<BindingSet> valueSet, PathIteration.ValuePair vp) protected boolean
addToQueue
(Queue<BindingSet> valueQueue2, PathIteration.ValuePair vp) static final Function
<BindingSet, Value> Used to turn a method call into a direct field accessstatic final Predicate
<BindingSet> Used to turn a method call into a direct field accessprotected BindingSet
Gets the next element.static final BiConsumer
<Value, MutableBindingSet> Used to turn a method call into a direct field accessprotected void
Called byAbstractCloseableIteration.close()
when it is called for the first time.protected boolean
isUnbound
(Var var, BindingSet bindings) Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration
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.CloseableIteration
stream
Methods inherited from interface java.util.Iterator
forEachRemaining
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Constructor Details
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PathIteration
public PathIteration(EvaluationStrategy strategy, StatementPattern.Scope scope, Var startVar, TupleExpr pathExpression, Var endVar, Var contextVar, long minLength, BindingSet bindings) throws QueryEvaluationException - Throws:
QueryEvaluationException
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Method Details
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getSet
Used to turn a method call into a direct field access- Parameters:
s
- the name of the variable to see if it is in the bindingset- Returns:
- the value of the start or end or if asked for a different field a null.
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getGet
Used to turn a method call into a direct field access- Parameters:
s
- the name of the variable to see if it is in the bindingset- Returns:
- the value of the start or end, if asked for a different field throw an illegalstate exception
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getHas
Used to turn a method call into a direct field access- Parameters:
s
- the name of the variable to see if it is in the bindingset- Returns:
- true if start or end is not null, if asked for a different field throw an illegalstate exception
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getNextElement
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 classLookAheadIteration<BindingSet>
- Returns:
- The next element, or null if no more elements are available.
- Throws:
QueryEvaluationException
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handleClose
Description copied from class:AbstractCloseableIteration
Called byAbstractCloseableIteration.close()
when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.- Specified by:
handleClose
in classAbstractCloseableIteration<BindingSet>
- Throws:
QueryEvaluationException
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addToQueue
protected boolean addToQueue(Queue<BindingSet> valueQueue2, PathIteration.ValuePair vp) throws QueryEvaluationException - Parameters:
valueQueue2
-vp
-- Throws:
QueryEvaluationException
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add
protected boolean add(Set<BindingSet> valueSet, PathIteration.ValuePair vp) throws QueryEvaluationException - Parameters:
valueSet
-vp
-- Throws:
QueryEvaluationException
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isUnbound
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