Class ProjectionIterator

java.lang.Object

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

org.eclipse.rdf4j.common.iteration.ConvertingIteration<BindingSet, BindingSet>

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

All Implemented Interfaces:

AutoCloseable, Iterator<BindingSet>, CloseableIteration<BindingSet>

public class ProjectionIterator
extends ConvertingIteration<BindingSet, BindingSet>

Field Summary

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
ProjectionIterator(Projection projection, CloseableIteration<BindingSet> iter, BindingSet parentBindings, QueryEvaluationContext context)

Method Summary

Modifier and Type	Method	Description
protected BindingSet	convert(BindingSet sourceBindings)	Converts a source type object to a target type object.
static BindingSet	project(ProjectionElemList projElemList, BindingSet sourceBindings, BindingSet parentBindings)
static BindingSet	project(ProjectionElemList projElemList, BindingSet sourceBindings, BindingSet parentBindings, boolean includeAllParentBindings)

Methods inherited from class ConvertingIteration

handleClose, hasNext, next, remove

Modifier and Type	Method	Description
protected void	handleClose()	Closes this iteration as well as the wrapped iteration if it is a CloseableIteration.
final boolean	hasNext()	Checks whether the source type iteration contains more elements.
final BindingSet	next()	Returns the next element from the source type iteration.
final void	remove()	Calls remove() on the underlying Iteration.

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

Constructor Details

ProjectionIterator

public ProjectionIterator(Projection projection,
 CloseableIteration<BindingSet> iter,
 BindingSet parentBindings,
 QueryEvaluationContext context)
                   throws QueryEvaluationException

Throws:

QueryEvaluationException

Method Details

convert

protected BindingSet convert(BindingSet sourceBindings)
                      throws QueryEvaluationException

Description copied from class: ConvertingIteration

Converts a source type object to a target type object.

Specified by:

convert in class ConvertingIteration<BindingSet, BindingSet>

Throws:

QueryEvaluationException

project

public static BindingSet project(ProjectionElemList projElemList,
 BindingSet sourceBindings,
 BindingSet parentBindings)

project

public static BindingSet project(ProjectionElemList projElemList,
 BindingSet sourceBindings,
 BindingSet parentBindings,
 boolean includeAllParentBindings)