/*
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 Sesame 2 {@link CloseableIteration} with a bigdata
* {@link ICloseableIterator}.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id: Bigdata2SesameIteration.java 2265 2009-10-26 12:51:06Z
* thompsonbry $
* @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 Sesame2BigdataIterator<T, E extends Exception> implements
ICloseableIterator<T> {
private final CloseableIteration<? extends T,E> src;
private volatile boolean open = true;
public Sesame2BigdataIterator(final CloseableIteration<? extends T,E> src) {
if (src == null)
throw new IllegalArgumentException();
this.src = src;
}
public void close() {
if (open) {
open = false;
try {
src.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
public boolean hasNext() {
try {
if (open && src.hasNext())
return true;
close();
return false;
} catch(Exception e) {
throw new RuntimeException(e);
}
}
public T next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
try {
return src.next();
} catch(Exception e) {
throw new RuntimeException(e);
}
}
public void remove() {
if(!open)
throw new IllegalStateException();
try {
src.remove();
} catch(Exception e) {
throw new RuntimeException(e);
}
}
}