Class FederatedDescribeIteration

java.lang.Object

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

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 DescribeIteration

parentBindings, VARNAME_OBJECT, VARNAME_PREDICATE, VARNAME_SUBJECT

Fields inherited from interface CloseableIteration

EMPTY_STATEMENT_ITERATION

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 DescribeIteration

getNextElement

Methods inherited from class LookAheadIteration

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

Methods inherited from interface 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 DescribeIteration

Throws:

QueryEvaluationException