Class StatementConversionIteration

java.lang.Object

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

org.eclipse.rdf4j.federated.evaluation.iterator.StatementConversionIteration

All Implemented Interfaces:

AutoCloseable, Iterator<BindingSet>, CloseableIteration<BindingSet>

public class StatementConversionIteration
extends AbstractCloseableIteration<BindingSet>

Converts Statement iteration (i.e. RepositoryResult) into the corresponding binding set. Note that exceptions are converted appropriately as well.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field	Description
protected final BindingSet	bindings
protected final RepositoryResult<Statement>	repoResult
protected final StatementPattern	stmt
protected boolean	updateContext
protected boolean	updateObj
protected boolean	updatePred
protected boolean	updateSubj

Fields inherited from interface CloseableIteration

EMPTY_STATEMENT_ITERATION

Modifier and Type	Field	Description
static final EmptyIteration<Statement>	EMPTY_STATEMENT_ITERATION

Constructor Summary

Constructors

Constructor	Description
StatementConversionIteration(RepositoryResult<Statement> repoResult, BindingSet bindings, StatementPattern stmt)

Method Summary

Modifier and Type	Method	Description
protected BindingSet	convert(Statement st)
protected QueryEvaluationException	convertException(Exception e)
protected void	handleClose()	Called by AbstractCloseableIteration.close() when it is called for the first time.
boolean	hasNext()
protected void	init()
BindingSet	next()
void	remove()

Methods inherited from class AbstractCloseableIteration

close, isClosed

Modifier and Type	Method	Description
final void	close()	Calls AbstractCloseableIteration.handleClose() upon first call and makes sure the resource closures are only executed once.
final boolean	isClosed()	Checks whether this CloseableIteration has been closed.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface CloseableIteration

stream

Modifier and Type	Method	Description
default Stream<BindingSet>	stream()	Convert the results to a Java 8 Stream.

Methods inherited from interface Iterator

forEachRemaining

Field Details

repoResult

protected final RepositoryResult<Statement> repoResult

bindings

protected final BindingSet bindings

stmt

protected final StatementPattern stmt

updateSubj

protected boolean updateSubj

updatePred

protected boolean updatePred

updateObj

protected boolean updateObj

updateContext

protected boolean updateContext

Constructor Details

StatementConversionIteration

public StatementConversionIteration(RepositoryResult<Statement> repoResult,
 BindingSet bindings,
 StatementPattern stmt)

Method Details

init

protected void init()

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

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.

Specified by:

handleClose in class AbstractCloseableIteration<BindingSet>

Throws:

QueryEvaluationException

convert

protected BindingSet convert(Statement st)

convertException

protected QueryEvaluationException convertException(Exception e)