Package org.eclipse.rdf4j.federated.evaluation.iterator

Class FederatedDescribeIteration

java.lang.Object

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

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

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

org.eclipse.rdf4j.federated.evaluation.iterator.FederatedDescribeIteration

All Implemented Interfaces:

AutoCloseable, Iterator<BindingSet>, CloseableIteration<BindingSet>

public class FederatedDescribeIteration
extends DescribeIteration

Specialized DescribeIteration for evaluation of DESCRIBE queries in the federation. ‚

Author:

Andreas Schwarte

Field Summary

Fields inherited from class org.eclipse.rdf4j.query.algebra.evaluation.iterator.DescribeIteration

parentBindings, VARNAME_OBJECT, VARNAME_PREDICATE, VARNAME_SUBJECT

Constructor Summary

Constructors

Constructor	Description
FederatedDescribeIteration(CloseableIteration<BindingSet> sourceIter, FederationEvalStrategy strategy, Set<String> describeExprNames, BindingSet parentBindings, QueryInfo queryInfo)

Method Summary

Modifier and Type	Method	Description
protected CloseableIteration<BindingSet>	createNextIteration(Value subject, Value object)
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.

Methods inherited from class org.eclipse.rdf4j.query.algebra.evaluation.iterator.DescribeIteration

getNextElement

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

Constructor Details

FederatedDescribeIteration

public FederatedDescribeIteration(CloseableIteration<BindingSet> sourceIter,
 FederationEvalStrategy strategy,
 Set<String> describeExprNames,
 BindingSet parentBindings,
 QueryInfo queryInfo)

Method Details

createNextIteration

protected CloseableIteration<BindingSet> createNextIteration(Value subject,
 Value object)
                                                      throws QueryEvaluationException

Overrides:

createNextIteration in class DescribeIteration

Throws:

QueryEvaluationException

handleClose

protected void handleClose()
                    throws QueryEvaluationException

Description copied from class: AbstractCloseableIteration

Called by AbstractCloseableIteration.close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.

Overrides:

handleClose in class LookAheadIteration<BindingSet>

Throws:

QueryEvaluationException