| 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.awt.event.ActionEvent; |
| 19 | import java.awt.event.ActionListener; |
| 20 | import java.util.HashMap; |
| 21 | import java.util.Iterator; |
| 22 | import java.util.Map; |
| 23 | |
| 24 | import org.apache.commons.logging.Log; |
| 25 | |
| 26 | /** |
| 27 | * Delegate for ActionEvents. |
| 28 | * |
| 29 | * @author Thomas Aglassinger |
| 30 | */ |
| 31 | public class ActionDelegate implements ActionListener |
| 32 | { |
| 33 | private Map listeners; |
| 34 | private Log logger; |
| 35 | |
| 36 | /** |
| 37 | * Creates a new delegate with logging messages going to logger. |
| 38 | * |
| 39 | * @param newLogger logger where the delegate logs its messages. |
| 40 | */ |
| 41 | public ActionDelegate(Log newLogger) { |
| 42 | logger = newLogger; |
| 43 | listeners = new HashMap(); |
| 44 | } |
| 45 | |
| 46 | public void actionPerformed(ActionEvent event) { |
| 47 | Iterator rider = listeners.keySet().iterator(); |
| 48 | |
| 49 | while (rider.hasNext()) { |
| 50 | ActionListener listener = (ActionListener) rider.next(); |
| 51 | |
| 52 | listener.actionPerformed(event); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | public void addActionListener(ActionListener listener) { |
| 57 | listeners.put(listener, new Throwable("stack where from where ActionListener was added")); |
| 58 | } |
| 59 | |
| 60 | public void removeActionListener(ActionListener listener) { |
| 61 | // TODO: Define exceptional_behavior of removeActionListener(). |
| 62 | if (!listeners.containsKey(listener)) { |
| 63 | logger.error("list of current listeners:"); |
| 64 | |
| 65 | Iterator rider = listeners.entrySet().iterator(); |
| 66 | |
| 67 | while (rider.hasNext()) { |
| 68 | Map.Entry entry = (Map.Entry) rider.next(); |
| 69 | |
| 70 | logger.error("- " + entry.getKey(), (Throwable) entry.getValue()); |
| 71 | } |
| 72 | throw new IllegalArgumentException("listener to remove must have been added before: " + listener); |
| 73 | } |
| 74 | listeners.remove(listener); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Checks that all listeners have been removed, and warns if not. |
| 79 | */ |
| 80 | protected void finalize() |
| 81 | throws Throwable { |
| 82 | Iterator rider = listeners.entrySet().iterator(); |
| 83 | |
| 84 | while (rider.hasNext()) { |
| 85 | Map.Entry entry = (Map.Entry) rider.next(); |
| 86 | ActionListener listener = (ActionListener) entry.getKey(); |
| 87 | Throwable stack = (Throwable) entry.getValue(); |
| 88 | |
| 89 | logger.warn("ActionListener should be removed: " + listener, stack); |
| 90 | } |
| 91 | super.finalize(); |
| 92 | } |
| 93 | } |