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package de.lmu.ifi.dbs.elki.utilities.designpattern;
import java.util.ArrayList;
/*
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/>.
*/
/**
* Class to manage the observers of an instance.
*
* Design note: to avoid reference cycles, this object does not keep track of
* its owner.
*
* @author Erich Schubert
*
* @apiviz.stereotype delegate
* @apiviz.has Observer
*/
public class Observers<T> extends ArrayList<Observer<? super T>> {
/**
* Serial version
*/
private static final long serialVersionUID = 1L;
/**
* Constructor.
*/
public Observers() {
super();
}
/**
* Add an observer to the object.
*
* @param o Observer to add
*/
public void addObserver(Observer<? super T> o) {
super.add(o);
}
/**
* Remove an observer from the object.
*
* @param o Observer to remove
*/
public void removeObserver(Observer<? super T> o) {
super.remove(o);
}
/**
* Notify the observers of the changed object.
*
* @param owner Owner of the Observers list - changed instance
*/
public void notifyObservers(T owner) {
for(Observer<? super T> observer : this) {
observer.update(owner);
}
}
}
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