/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Sep 4, 2008
*/
package com.bigdata.rdf.sail;
import java.util.NoSuchElementException;
import info.aduna.iteration.CloseableIteration;
import cutthecrap.utils.striterators.ICloseableIterator;
/**
* Class aligns a bigdata {@link ICloseableIterator} with a Sesame 2
* {@link CloseableIteration}.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
* @param <T>
* The generic type of the visited elements.
* @param <E>
* The generic type of the exceptions thrown by the Sesame 2
* {@link CloseableIteration}.
*/
public class Bigdata2SesameIteration<T, E extends Exception> implements
CloseableIteration<T, E> {
private final ICloseableIterator<? extends T> src;
private boolean open = true;
public Bigdata2SesameIteration(final ICloseableIterator<? extends T> src) {
if (src == null)
throw new IllegalArgumentException();
this.src = src;
}
public void close() throws E {
if (open) {
open = false;
src.close();
}
}
public boolean hasNext() throws E {
if(open && src.hasNext())
return true;
close();
return false;
}
public T next() throws E {
if (!hasNext())
throw new NoSuchElementException();
return src.next();
}
public void remove() throws E {
if(!open)
throw new IllegalStateException();
src.remove();
}
}