| 0,0 → 1,160 |
|---|
| /* |
| AVRcamVIEW: A PC application to test out the functionallity of the |
| AVRcam real-time image processing engine. |
| Copyright (C) 2004 Brent A. Taylor |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public |
| License as published by the Free Software Foundation; either |
| version 2 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU 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 USA |
| |
| For more information on the AVRcamVIEW, please contact: |
| |
| taylorba@comcast.net |
| |
| or go to www.jrobot.net for more details regarding the system. |
| */ |
| |
| package avr.connection; |
| |
| import javax.swing.event.*; |
| |
| import avr.connection.event.*; |
| |
| /*********************************************************************** |
| * Defines a Connection that fires events describing if the connection |
| * was opened or closed. |
| */ |
| public abstract class AbstractConnection implements Connection { |
| |
| /** |
| * The list of registered event listeners. |
| */ |
| private EventListenerList listenerList; |
| |
| /** |
| * Boolean to test if the connection is connected (true) or |
| * disconnected (false). |
| */ |
| private boolean connected; |
| |
| /** |
| * Initialize this object and set connected to false. |
| */ |
| protected AbstractConnection() { |
| listenerList = new EventListenerList(); |
| connected = false; |
| } |
| |
| /** |
| * Set connected to true and fire a connected event. |
| */ |
| protected void setConnected() { |
| setConnected(true); |
| fireConnectedEvent(this); |
| } |
| |
| /** |
| * Set connected to false and fire a disconnected event. |
| */ |
| protected void setDisconnected() { |
| setConnected(false); |
| fireDisconnectedEvent(this); |
| } |
| |
| /** |
| * Set this connected variable to the given value. |
| * @param connected true if this connection is connected, false otherwise. |
| */ |
| private void setConnected(boolean connected) { |
| this.connected = connected; |
| } |
| |
| /** |
| * Tells whether or not this connection is connected. |
| * @return true if, and only if, this connection is connected. |
| */ |
| public boolean isConnected() { |
| return connected; |
| } |
| |
| /** |
| * Adds a listener to the list that's notified each time a connect or |
| * disconnect occurs. |
| * @param cl the ConnectionListener |
| */ |
| public void addConnectionListener(ConnectionListener cl) { |
| listenerList.add(ConnectionListener.class, cl); |
| } |
| |
| /** |
| * Removes a listener to the list that's notified each time a connect or |
| * disconnect occurs. |
| * @param cl the ConnectionListener |
| */ |
| public void removeConnectionListener(ConnectionListener cl) { |
| listenerList.remove(ConnectionListener.class, cl); |
| } |
| |
| public void removeAllConnectionListeners() { |
| ConnectionListener[] listeners = getConnectionListeners(); |
| for(int i = 0; i < listeners.length; i++) { |
| removeConnectionListener(listeners[i]); |
| } |
| } |
| |
| /** |
| * Returns an array of all the connection listeners registered on |
| * this connection. |
| * @return all of this connection's ConnectionListeners or |
| * an empty array if no connection listeners are currently registered |
| */ |
| public ConnectionListener[] getConnectionListeners() { |
| return (ConnectionListener[]) |
| listenerList.getListeners(ConnectionListener.class); |
| } |
| |
| /** |
| * Notifies all listeners that a connection has been established. |
| * @param source This connection. |
| */ |
| protected void fireConnectedEvent(Object source) { |
| ConnectionListener[] listeners = getConnectionListeners(); |
| |
| ConnectionEvent event = null; |
| |
| for(int i = 0; i < listeners.length; i++) { |
| if(event == null) { |
| event = new ConnectionEvent(this); |
| } |
| listeners[i].connected(event); |
| } |
| } |
| |
| /** |
| * Notifies all listeners that a connection has been destroyed. |
| * @param source This connection. |
| */ |
| protected void fireDisconnectedEvent(Object source) { |
| ConnectionListener[] listeners = getConnectionListeners(); |
| |
| ConnectionEvent event = null; |
| |
| for(int i = 0; i < listeners.length; i++) { |
| if(event == null) { |
| event = new ConnectionEvent(this); |
| } |
| listeners[i].disconnected(event); |
| } |
| } |
| |
| } |