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ConsoleUI.java
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ConsoleUI.java
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/*
* CS352 Example Chat Client
* Copyright (C) 2011 Rutgers University and Robert Moore
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package com.kd.chat.ui;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Collection;
import java.util.concurrent.ConcurrentLinkedQueue;
import com.kd.chat.Client;
/**
* A simple user interface for the chat client. General chat messages are sent
* by typing and pressing <Enter>. Private chat messages are specified by
* providing the username preceded by the at sign (@) followed by a space and
* the message. The user can terminate the chat client by typing entering
* "quit".
*
* @author Robert Moore
*
*/
public class ConsoleUI extends Thread implements UIAdapter {
/**
* Collection of listeners for user input/quit requests.
*/
protected final Collection<UserInputListener> listeners = new ConcurrentLinkedQueue<UserInputListener>();
/**
* List of currently-connected clients. Used to validate private message
* destinations before passing to any UserInterfaceListener interfaces.
*/
protected final Collection<Client> knownClients = new ConcurrentLinkedQueue<Client>();
/**
* Flag to keep awaiting user input.
*/
protected boolean keepRunning = true;
/**
* Adds a UserInterfaceListener interface to this object's list of listeners.
*
* @param listener
* the UserInterfaceListener to add.
*/
public void addUserInputListener(UserInputListener listener) {
this.listeners.add(listener);
}
/**
* Removes a UserInterfaceListener interface from this object's list of listeners.
*
* @param listener
* the UserInterfaceListener to remove.
*/
public void removeUserInputListener(UserInputListener listener) {
this.listeners.remove(listener);
}
/**
* Prints out the chat message to the system out as "username: message"
*/
public void chatMessageReceived(Client fromClient, long timestamp,
String message) {
System.out.println(fromClient.getUsername() + ": " + message);
}
/**
* Continuously awaits user input and passes the chat messages or quit
* request to any registered UserInputListener interfaces.
*/
@Override
public void run() {
// Convenience wrapper around System.in
BufferedReader reader = new BufferedReader(new InputStreamReader(
System.in));
// Helpful little instructions.
System.out
.println("Send broadcast messages by typing and hitting <Enter>.");
System.out
.println("Send private messages like this: @username message to send.");
System.out.println("Type \"quit\" to exit.");
// Keep awiting user input until the user wants to quit.
while (this.keepRunning) {
try {
String line = reader.readLine();
if ("quit".equalsIgnoreCase(line)) {
for (UserInputListener listener : this.listeners) {
listener.userRequestedShutdown();
}
break;
}
if(line == null){
continue;
}
// Check for private message
if (line.startsWith("@")) {
int usernameBreak = line.indexOf(' ');
String username = line.substring(1, usernameBreak);
String message = line.substring(usernameBreak + 1, line
.length());
Client theClient = null;
// Find the client based on the username
for (Client client : this.knownClients) {
if (client.getUsername().equals(username)) {
theClient = client;
break;
}
}
// If the client wasn't found, print an error message and
// await next input
if (theClient == null) {
System.out.println("Could not find user \"" + username
+ "\".");
continue;
}
// Notify the listeners that a private message was entered
for (UserInputListener listener : this.listeners) {
listener.privateChatMessage(theClient, message);
}
}
// Broadcast (general) chat message
else {
// Notify the listeners that a broadcast chat message was
// entered
for (UserInputListener listener : this.listeners) {
listener.broadcastChatMessage(line);
}
}
} catch (IOException e) {
// Left in for debugging
e.printStackTrace();
continue;
}
}
}
/**
* Does nothing, as the console already echoes the user's input.
*/
@Override
public void chatMessageSent(long timestamp, String message) {
// Not going to repeat the message since the console already provides
// display
}
/**
* Adds the client to the collection of known clients.
*/
@Override
public void clientConnected(Client connectedClient) {
System.out.println("Connected to " + connectedClient);
this.knownClients.add(connectedClient);
}
/**
* Removes the client from the collection of known clients. Prints a
*/
@Override
public void clientDisconnected(Client disconnectedClient, String reason) {
this.knownClients.remove(disconnectedClient);
System.out.println(disconnectedClient + " disconnected"
+ (reason == null ? "." : (" because: " + reason)));
}
/**
* Prints an error message to the console to notify the user that the
* message could not be sent to some client.
*/
@Override
public void messageNotSent(Client client, String message, String reason) {
System.out.println("The following message could not be sent to "
+ client + ":\n" + message
+ (reason == null ? "\n" : "\n\nReason: " + reason));
}
@Override
public void chatMessageRecieved(Client fromClient, long timestamp,
String message) {
// TODO Auto-generated method stub
}
}