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kaklik |
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/*
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AVRcamVIEW: A PC application to test out the functionallity of the
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AVRcam real-time image processing engine.
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Copyright (C) 2004 Brent A. Taylor
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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For more information on the AVRcamVIEW, please contact:
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taylorba@comcast.net
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or go to www.jrobot.net for more details regarding the system.
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*/
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package avr.connection;
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import javax.swing.event.*;
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import avr.connection.event.*;
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/***********************************************************************
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* Defines a Connection that fires events describing if the connection
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* was opened or closed.
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*/
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public abstract class AbstractConnection implements Connection {
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/**
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* The list of registered event listeners.
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*/
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private EventListenerList listenerList;
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/**
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* Boolean to test if the connection is connected (true) or
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* disconnected (false).
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*/
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private boolean connected;
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/**
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* Initialize this object and set connected to false.
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*/
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protected AbstractConnection() {
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listenerList = new EventListenerList();
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connected = false;
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}
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/**
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* Set connected to true and fire a connected event.
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*/
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protected void setConnected() {
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setConnected(true);
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fireConnectedEvent(this);
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}
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/**
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* Set connected to false and fire a disconnected event.
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*/
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protected void setDisconnected() {
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setConnected(false);
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fireDisconnectedEvent(this);
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}
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/**
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* Set this connected variable to the given value.
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* @param connected true if this connection is connected, false otherwise.
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*/
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private void setConnected(boolean connected) {
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this.connected = connected;
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}
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/**
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* Tells whether or not this connection is connected.
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* @return true if, and only if, this connection is connected.
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*/
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public boolean isConnected() {
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return connected;
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}
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/**
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* Adds a listener to the list that's notified each time a connect or
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* disconnect occurs.
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* @param cl the ConnectionListener
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*/
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public void addConnectionListener(ConnectionListener cl) {
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listenerList.add(ConnectionListener.class, cl);
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}
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/**
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* Removes a listener to the list that's notified each time a connect or
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* disconnect occurs.
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* @param cl the ConnectionListener
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*/
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public void removeConnectionListener(ConnectionListener cl) {
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listenerList.remove(ConnectionListener.class, cl);
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}
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public void removeAllConnectionListeners() {
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ConnectionListener[] listeners = getConnectionListeners();
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for(int i = 0; i < listeners.length; i++) {
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removeConnectionListener(listeners[i]);
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}
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}
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/**
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* Returns an array of all the connection listeners registered on
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* this connection.
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* @return all of this connection's ConnectionListeners or
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* an empty array if no connection listeners are currently registered
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*/
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public ConnectionListener[] getConnectionListeners() {
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return (ConnectionListener[])
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listenerList.getListeners(ConnectionListener.class);
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}
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/**
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* Notifies all listeners that a connection has been established.
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* @param source This connection.
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*/
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protected void fireConnectedEvent(Object source) {
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ConnectionListener[] listeners = getConnectionListeners();
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ConnectionEvent event = null;
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for(int i = 0; i < listeners.length; i++) {
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if(event == null) {
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event = new ConnectionEvent(this);
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}
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listeners[i].connected(event);
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}
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}
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/**
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* Notifies all listeners that a connection has been destroyed.
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* @param source This connection.
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*/
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protected void fireDisconnectedEvent(Object source) {
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ConnectionListener[] listeners = getConnectionListeners();
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ConnectionEvent event = null;
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for(int i = 0; i < listeners.length; i++) {
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if(event == null) {
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event = new ConnectionEvent(this);
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}
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listeners[i].disconnected(event);
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}
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}
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}
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