Package org.eclipse.rdf4j.federated.evaluation.iterator

Class LazyMutableClosableIteration

java.lang.Object

org.eclipse.rdf4j.federated.evaluation.iterator.LazyMutableClosableIteration

All Implemented Interfaces:

AutoCloseable, Iterator<BindingSet>, CloseableIteration<BindingSet>

public class LazyMutableClosableIteration
extends Object
implements CloseableIteration<BindingSet>

A specialized CloseableIteration that allows repetitive iterations after resetting the cursor using resetCursor().

Note that the inner iteration is lazily consumed.

Author:

Andreas Schwarte

Field Summary

Fields

Modifier and Type	Field	Description
protected List<BindingSet>	consumed
protected int	cursorIdx	the cursor index, is used after the inner iteration is fully consumed
protected final CloseableIteration<BindingSet>	inner

Constructor Summary

Constructors

Constructor	Description
LazyMutableClosableIteration(CloseableIteration<BindingSet> inner)

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this iteration, freeing any resources that it is holding.
boolean	hasNext()
BindingSet	next()
void	remove()
void	resetCursor()	Reset the cursor to read from the already consumed bindings.

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.CloseableIteration

stream

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Details

inner

protected final CloseableIteration<BindingSet> inner

consumed

protected List<BindingSet> consumed

cursorIdx

protected volatile int cursorIdx

the cursor index, is used after the inner iteration is fully consumed

Constructor Details

LazyMutableClosableIteration

public LazyMutableClosableIteration(CloseableIteration<BindingSet> inner)

Method Details

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Specified by:

hasNext in interface Iterator<BindingSet>

Throws:

QueryEvaluationException

next

public BindingSet next()
                throws QueryEvaluationException

Specified by:

next in interface Iterator<BindingSet>

Throws:

QueryEvaluationException

remove

public void remove()
            throws QueryEvaluationException

Specified by:

remove in interface Iterator<BindingSet>

Throws:

QueryEvaluationException

close

public void close()
           throws QueryEvaluationException

Description copied from interface: CloseableIteration

Closes this iteration, freeing any resources that it is holding. If the iteration has already been closed then invoking this method has no effect.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface CloseableIteration<BindingSet>

Throws:

QueryEvaluationException

resetCursor

public void resetCursor()

Reset the cursor to read from the already consumed bindings.