Package org.eclipse.rdf4j.common.iteration

Class AbstractCloseableIteration<E>

java.lang.Object

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

All Implemented Interfaces:

AutoCloseable, Iterator<E>, CloseableIteration<E>

Direct Known Subclasses:

AbstractCloseableIteratorIteration, CloseDependentConnectionIteration, CollectionIteration, ConvertingIteration, DelayedIteration, ExceptionConvertingIteration, GraphToBindingSetConversionIteration, IterationWrapper, LookAheadIteration, PrintingIteration, QueryContextIteration, QueryResultIteration, RepositoryResult, SingleBindingSetIteration, SingletonIteration, StatementConversionIteration, StopRemainingExecutionsOnCloseIteration

public abstract class AbstractCloseableIteration<E>
extends Object
implements CloseableIteration<E>

Base class for CloseableIterations offering common functionality. This class keeps track of whether the iteration has been closed and handles multiple calls to close() by ignoring all but the first call.

Instances of this class is not safe to be accessed from multiple threads at the same time.

Constructor Summary

Constructors

Constructor	Description
AbstractCloseableIteration()

Method Summary

Modifier and Type	Method	Description
final void	close()	Calls handleClose() upon first call and makes sure the resource closures are only executed once.
protected abstract void	handleClose()	Called by close() when it is called for the first time.
final boolean	isClosed()	Checks whether this CloseableIteration has been closed.

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, hasNext, next, remove

Constructor Details

AbstractCloseableIteration

public AbstractCloseableIteration()

Method Details

isClosed

public final boolean isClosed()

Checks whether this CloseableIteration has been closed.

Returns:

true if the CloseableIteration has been closed, false otherwise.

close

public final void close()

Calls handleClose() upon first call and makes sure the resource closures are only executed once.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface CloseableIteration<E>

handleClose

protected abstract void handleClose()

Called by close() when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.