org.eclipse.rdf4j.common.iteration

Class IterationWrapper<E,X extends Exception>

java.lang.Object

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

org.eclipse.rdf4j.common.iteration.IterationWrapper<E,X>

All Implemented Interfaces:

AutoCloseable, CloseableIteration<E,X>, Iteration<E,X>

Direct Known Subclasses:

BackgroundGraphResult, FilterIteration, InsertBindingSetCursor, InsertBindingSetCursor, IteratingGraphQueryResult, IteratingTupleQueryResult, LimitIteration, LockingIteration, TimeLimitIteration

public class IterationWrapper<E,X extends Exception>
extends AbstractCloseableIteration<E,X>

Abstract superclass for Iterations that wrap other Iterations. The abstract class IterationWrapper itself provides default methods that forward method calls to the wrapped Iteration. Subclasses of IterationWrapper should override some of these methods and may also provide additional methods and fields.

Field Summary

Fields

Modifier and Type	Field and Description
protected Iteration<? extends E,? extends X>	wrappedIter Deprecated. This will be changed to private, possibly with an accessor in future. Do not rely on it.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	IterationWrapper(Iteration<? extends E,? extends X> iter) Creates a new IterationWrapper that operates on the supplied Iteration.

Method Summary

Modifier and Type	Method and Description
protected void	handleClose() Closes this Iteration and also closes the wrapped Iteration if it is a CloseableIteration.
boolean	hasNext() Checks whether the wrapped Iteration contains more elements, closing this Iteration when this is not the case.
E	next() Returns the next element from the wrapped Iteration.
void	remove() Removes the last element that has been returned from the wrapped Iteration.

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

Field Detail

wrappedIter

@Deprecated
protected final Iteration<? extends E,? extends X extends Exception> wrappedIter

Deprecated. This will be changed to private, possibly with an accessor in future. Do not rely on it.

The wrapped Iteration.

Constructor Detail

IterationWrapper

protected IterationWrapper(Iteration<? extends E,? extends X> iter)

Creates a new IterationWrapper that operates on the supplied Iteration.

Parameters:

iter - The wrapped Iteration for this IterationWrapper, must not be null.

Method Detail

hasNext

public boolean hasNext()
                throws X extends Exception

Checks whether the wrapped Iteration contains more elements, closing this Iteration when this is not the case.

Returns:

true if the wrapped Iteration contains more elements, false otherwise.

Throws:

X

X extends Exception

next

public E next()
       throws X extends Exception

Returns the next element from the wrapped Iteration.

Returns:

the next element in the iteration.

Throws:

NoSuchElementException - If all elements have been returned or it has been closed.

X extends Exception

remove

public void remove()
            throws X extends Exception

Removes the last element that has been returned from the wrapped Iteration.

Throws:

UnsupportedOperationException - If the wrapped Iteration does not support the remove operation.

IllegalStateException - if the Iteration has been closed, or if next() has not yet been called, or remove() has already been called after the last call to next().

X extends Exception

handleClose

protected void handleClose()
                    throws X extends Exception

Closes this Iteration and also closes the wrapped Iteration if it is a CloseableIteration.

Overrides:

handleClose in class AbstractCloseableIteration<E,X extends Exception>

Throws:

X

X extends Exception