info.aduna.iteration

Class ExceptionConvertingIteration<E,X extends Exception>

java.lang.Object

info.aduna.iteration.CloseableIterationBase<E,X>

info.aduna.iteration.ExceptionConvertingIteration<E,X>

All Implemented Interfaces:

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

public abstract class ExceptionConvertingIteration<E,X extends Exception>
extends CloseableIterationBase<E,X>

A CloseableIteration that converts an arbitrary iteration to an iteration with exceptions of type X. Subclasses need to override convert(Exception) to do the conversion.

Constructor Summary

Constructors

Constructor and Description
ExceptionConvertingIteration(Iteration<? extends E,? extends Exception> iter) Creates a new ExceptionConvertingIteration that operates on the supplied iteration.

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract X	convert(Exception e) Converts an exception from the underlying iteration to an exception of type X.
protected void	handleClose() Closes this Iteration as well as the wrapped Iteration if it happens to be a CloseableIteration.
boolean	hasNext() Checks whether the underlying Iteration contains more elements.
E	next() Returns the next element from the wrapped Iteration.
void	remove() Calls remove() on the underlying 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

Constructor Detail

ExceptionConvertingIteration

public ExceptionConvertingIteration(Iteration<? extends E,? extends Exception> iter)

Creates a new ExceptionConvertingIteration that operates on the supplied iteration.

Parameters:

iter - The Iteration that this ExceptionConvertingIteration operates on, must not be null.

Method Detail

convert

protected abstract X convert(Exception e)

Converts an exception from the underlying iteration to an exception of type X.

hasNext

public boolean hasNext()
                throws X extends Exception

Checks whether the underlying Iteration contains more elements.

Returns:

true if the underlying 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:

X

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

Calls remove() on the underlying 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 as well as the wrapped Iteration if it happens to be a CloseableIteration.

Overrides:

handleClose in class CloseableIterationBase<E,X extends Exception>

Throws:

X

X extends Exception