| /******************************************************************************* |
| * Copyright (C) 2007 The University of Manchester |
| * |
| * Modifications to the initial code base are copyright of their |
| * respective authors, or their employers as appropriate. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public License |
| * as published by the Free Software Foundation; either version 2.1 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser 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 |
| ******************************************************************************/ |
| package net.sf.taverna.t2.lang.observer; |
| |
| import java.util.List; |
| |
| /** |
| * Implements this if you want to notify other classes about changes |
| * |
| * @author Ian Dunlop |
| * @author Stian Soiland |
| * |
| * @param <Message> |
| */ |
| public interface Observable<Message> { |
| /** |
| * Register an {@link Observer} |
| * |
| * @param observer |
| * the class who wants notified of changes |
| */ |
| public void addObserver(Observer<Message> observer); |
| |
| /** |
| * Remove a class who is currently observing |
| * |
| * @param observer |
| * the class who no longer wants notified |
| */ |
| public void removeObserver(Observer<Message> observer); |
| |
| /** |
| * A list of all the currently registered {@link Observer}s |
| * |
| * @return |
| */ |
| public List<Observer<Message>> getObservers(); |
| } |