info.aduna.iteration
Class IterationWrapper<E,X extends Exception>

java.lang.Object
  info.aduna.iteration.CloseableIterationBase<E,X>
      info.aduna.iteration.IterationWrapper<E,X>

All Implemented Interfaces:

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

Direct Known Subclasses:

FilterIteration, IteratorWrapper, LimitIteration, LockingIteration

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

protected Iteration<? extends E,? extends X>

wrappedIter The wrapped Iteration.

Fields inherited from class info.aduna.iteration.CloseableIterationBase

logger

Constructor Summary

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

Method Summary

protected void	handleClose() Closed 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 info.aduna.iteration.CloseableIterationBase

close, isClosed

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

wrappedIter

protected Iteration<? extends E,? extends X extends Exception> wrappedIter

The wrapped Iteration.

Constructor Detail

IterationWrapper

public 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.

IllegalStateException - If the Iteration 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

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

Overrides:

handleClose in class CloseableIterationBase<E,X extends Exception>

Throws:

X

X extends Exception