1 /**
2 * Copyright 2006 Matthew Purland (m.purland@gmail.com)
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package net.sf.mud4j.util;
18
19
20 /**
21 * Observable interface for objects that wish to become observable
22 * will implement this interface.
23 *
24 * @author Matthew Purland
25 *
26 */
27 public interface Observable {
28
29 /**
30 * Register an observer for notifications.
31 * @param observer
32 */
33 public void registerObserver(Observer observer);
34
35 /**
36 * Remove an observer from notifications.
37 * @param observer
38 */
39 public void removeObserver(Observer observer);
40
41 /**
42 * Notify all observers of an event.
43 */
44 public void notifyAllObservers();
45
46 /**
47 * Notify a specific given observer of an event.
48 */
49 public void notifyObserver(Observer observer);
50 }