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package de.lmu.ifi.dbs.elki.utilities.iterator;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.Iterator;
/**
* Dummy iterator/iterable that returns a single object, once.
*
* Note: a "null" object is not supported.
*
* @author Erich Schubert
*
* @param <T> Object type to return
*/
public class OneItemIterator<T> implements Iterator<T> {
/**
* Object to return.
*/
private T object = null;
/**
* Constructor.
*
* @param object Object to return once.
*/
public OneItemIterator(T object) {
super();
this.object = object;
}
@Override
public boolean hasNext() {
return (object != null);
}
@Override
public T next() {
T ret = object;
object = null;
return ret;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
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