package ca.ubc.cs.spl.aspectPatterns.examples.observer.java;
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This file is part of the design patterns project at UBC
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is ca.ubc.cs.spl.aspectPatterns.
*
* For more details and the latest version of this code, please see:
* http://www.cs.ubc.ca/labs/spl/projects/aodps.html
*
* Contributor(s):
*/
/**
* Declares methods to attach and detach <i>Observer<i>s to/from
* <i>Subject</i>s, and the <code>notifyObservers()</code> method.
*
* @author Jan Hannemann
* @author Gregor Kiczales
* @version 1.11, 04/01/04
*/
public interface ChangeSubject {
/**
* Attaches an <i>Observer</i> to this <i>Subject</i>.
*
* @param o the <i>Observer</i> to add
*/
public void addObserver(ChangeObserver o);
/**
* Detaches an <i>Observer</i> from this <i>Subject</i>.
*
* @param o the <i>Observer</i> to remove
*/
public void removeObserver(ChangeObserver o);
/**
* Notifies all <i>Observer</i>s.
*/
public void notifyObservers();
}