| 1 | // Jomic - a viewer for comic book archives. |
| 2 | // Copyright (C) 2004-2011 Thomas Aglassinger |
| 3 | // |
| 4 | // This program is free software: you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation, either version 3 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // This program is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | package net.sf.jomic.tools; |
| 17 | |
| 18 | import java.util.Iterator; |
| 19 | import java.util.LinkedList; |
| 20 | import java.util.List; |
| 21 | |
| 22 | /** |
| 23 | * Utility class to simplify implementing a Progressable. |
| 24 | * |
| 25 | * @author Thomas Aglassinger |
| 26 | * @see Task |
| 27 | */ |
| 28 | public class ProgressChangeSupport |
| 29 | { |
| 30 | private List listeners; |
| 31 | |
| 32 | public ProgressChangeSupport() { |
| 33 | listeners = new LinkedList(); |
| 34 | } |
| 35 | |
| 36 | public void addProgressChangeListener(ProgressChangeListener newListener) { |
| 37 | assert newListener != null; |
| 38 | |
| 39 | synchronized (listeners) { |
| 40 | assert !listeners.contains(newListener); |
| 41 | listeners.add(newListener); |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | public void fireProgressChangedEvent(Task source) { |
| 46 | assert source != null; |
| 47 | |
| 48 | synchronized (listeners) { |
| 49 | Iterator listenerRider = listeners.iterator(); |
| 50 | |
| 51 | while (listenerRider.hasNext()) { |
| 52 | ProgressChangeListener listener = (ProgressChangeListener) listenerRider.next(); |
| 53 | |
| 54 | listener.progressChanged(source); |
| 55 | } |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | public void removeProgressChangeListener(ProgressChangeListener newListener) { |
| 60 | assert newListener != null; |
| 61 | |
| 62 | synchronized (listeners) { |
| 63 | boolean removed = listeners.remove(newListener); |
| 64 | |
| 65 | assert removed; |
| 66 | } |
| 67 | } |
| 68 | } |