Class BoundJoinVALUESConversionIteration

java.lang.Object

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

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

org.eclipse.rdf4j.federated.evaluation.iterator.BoundJoinVALUESConversionIteration

All Implemented Interfaces:

AutoCloseable, Iterator<BindingSet>, CloseableIteration<BindingSet>

public class BoundJoinVALUESConversionIteration
extends ConvertingIteration<BindingSet, BindingSet>

Inserts original bindings into the result. This implementation is used for bound joins with VALUES clauses.

It is assumed the the query results contain a binding for "?__index" which corresponds to the index in the input mappings. See QueryStringUtil for details

Since:

3.0

Author:

Andreas Schwarte

See Also:

• FederationEvaluationStrategy

Field Summary

Fields

Modifier and Type	Field	Description
protected final List<BindingSet>	bindings
static final String	INDEX_BINDING_NAME	The binding name for the index

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
BoundJoinVALUESConversionIteration(CloseableIteration<BindingSet> iter, List<BindingSet> bindings)

Method Summary

Modifier and Type	Method	Description
protected BindingSet	convert(BindingSet bIn)	Converts a source type object to a target type object.

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

Field Details

INDEX_BINDING_NAME

public static final String INDEX_BINDING_NAME

The binding name for the index

See Also:

• Constant Field Values

bindings

protected final List<BindingSet> bindings

Constructor Details

BoundJoinVALUESConversionIteration

public BoundJoinVALUESConversionIteration(CloseableIteration<BindingSet> iter,
 List<BindingSet> bindings)

Method Details

convert

protected BindingSet convert(BindingSet bIn)
                      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