Refactoring: Moving GUI program logic from CoderClient to each controller class

-Removing the Session Guard
-Adding a SessionHandler
-Adding a ProjectHandler

src/com/coder/client/session/SessionHandler.java

@@ -0,0 +1,107 @@
+package com.coder.client.session;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import zutil.log.LogUtil;
+
+import com.coder.server.message.CoderMessage;
+
+public class SessionHandler{
+	public static final Logger logger = LogUtil.getLogger();
+
+	private Session session;
+	private HashSet<SessionListener> sessionListeners = new HashSet<SessionListener>();
+	private HashSet<ProjectMessageListener> messageListeners = new HashSet<ProjectMessageListener>();
+	
+	public boolean setupConnection(String url, int port){
+		if(session != null && session.isConnected()){
+			session.close();
+		}
+		session = Session.setupConnection(url, port);
+		if(session != null){
+			for(ProjectMessageListener listener : messageListeners){
+				session.addMessageListener(listener);
+			}
+			for(SessionListener listener : sessionListeners){
+				listener.sessionConnectionSuccess();
+			}
+			return true;
+		}else{
+			for(SessionListener listener : sessionListeners){
+				listener.sessionConnectionFailure();
+			}
+			return false;
+		}
+	}
+	
+	public boolean authenticateSession(String username, char[] clearTextPassword){
+		if(session == null){
+			return false;
+		}else{
+			boolean success = session.authenticate(username, clearTextPassword); 
+			if(success){
+				for(SessionListener listener : sessionListeners){
+					listener.sessionAuthenticationSuccess();
+				}
+				session.start();
+				return true;
+			}else{
+				for(SessionListener listener : sessionListeners){
+					listener.sessionAuthenticationFailure();
+				}
+				return false;
+			}
+		}
+	}
+	
+	public boolean sendMessage(CoderMessage msg){
+		logger.fine("sending a message");
+		if(session != null){
+			try {
+				session.send(msg);
+			} catch (IOException e) {
+				logger.log(Level.SEVERE, "unable to send message", e);
+				closeCurrentSession(true);
+				return false;
+			}
+			logger.fine("successfully sent the meessage");
+			return true;
+		}
+		return false;
+	}
+	
+	public void closeCurrentSession(boolean retry){
+		if(session != null){
+			logger.info("closing session to server");
+			session.close();
+			session = null;
+			for(SessionListener listener : sessionListeners){
+				listener.sessionDisconnected(retry);
+			}
+		}else{
+			logger.fine("cannot close current session: session already terminated");
+		}
+	}
+	
+	public void addSessionListener(SessionListener listener){
+		this.sessionListeners.add(listener);
+	}
+
+	public void addMessageListener(ProjectMessageListener listener) {
+		messageListeners.add(listener);
+		if(session != null){
+			session.addMessageListener(listener);
+		}
+	}
+
+	public void authenticationCancel() {
+		closeCurrentSession(false);
+		for(SessionListener listener : sessionListeners){
+			listener.sessionAuthenticationCancel();
+		}
+	}
+	
+}