org.eclipse.rdf4j.federated.evaluation.iterator

Class StatementConversionIteration

java.lang.Object

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

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

All Implemented Interfaces:

AutoCloseable, CloseableIteration<BindingSet,QueryEvaluationException>, Iteration<BindingSet,QueryEvaluationException>

public class StatementConversionIteration
extends AbstractCloseableIteration<BindingSet,QueryEvaluationException>

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and 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() Returns true if the iteration has more elements.
protected void	init()
BindingSet	next() Returns the next element in the iteration.
void	remove() Removes from the underlying collection the last element returned by the iteration (optional operation).

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.Iteration

stream

Field Detail

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 Detail

StatementConversionIteration

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

Method Detail

init

protected void init()

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns true if the iteration has more elements. (In other words, returns true if Iteration.next() would return an element rather than throwing a NoSuchElementException.)

Returns:

true if the iteration has more elements.

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Description copied from interface: Iteration

Returns the next element in the iteration.

Returns:

the next element in the iteration.

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

Description copied from interface: Iteration

Removes from the underlying collection the last element returned by the iteration (optional operation). This method can be called only once per call to next.

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 AbstractCloseableIteration<BindingSet,QueryEvaluationException>

Throws:

QueryEvaluationException

convert

protected BindingSet convert(Statement st)

convertException

protected QueryEvaluationException convertException(Exception e)