// Methods for the treatment of the different message types
private void loginMessageTreatment() throws IncorrectMessageException {
String content = message.getText().trim();
if (content != null && !content.contains("&")) {
if (this.userList.getUserByNick(content) != null) {
// The nick already exist (send 301)
String response = new Integer(Message.ERROR_MESSAGE_EXISTING_NICK).toString();
sendDatagram(
new User(
null,
messageToProcces.getAddress().getHostAddress(),
this.messageToProcces.getPort()),
response);
// Comprobamos el nick pero, ¿Y si ya hay un usuario en esa IP???
} else {
// Everything correct, send ACK
User newUser =
new User(
content,
this.messageToProcces.getAddress().getHostAddress(),
this.messageToProcces.getPort());
userList.add(newUser);
String response =
new Integer(Message.SERVER_MESSAGE_CONNECTED).toString() + this.userList.toString();
sendDatagram(newUser, response);
}
} else {
throw new IncorrectMessageException(
"The Login message is not correct: '" + content.toString() + "'");
}
}
private void crossMessagesTreatment() {
String response = message.getSimpleResponse();
if (response != null) {
this.sendDatagram(this.message.getTo(), response);
} else {
// User disconnected
response =
new Integer(Message.ERROR_MESSAGE_USER_IS_DISCONNECTED).toString()
+ this.userList.toString();
this.sendDatagram(this.message.getFrom(), response);
}
}
/**
* Dispatcher for the different message types
*
* @throws IncorrectMessageException
*/
private void treatMessage() throws IncorrectMessageException {
if (message.isCrossMessage()) {
// todos los cross messages
crossMessagesTreatment();
} else {
switch (message.getMessageType()) {
case Message.CLIENT_MESSAGE_LOGIN:
// mensaje de login
this.loginMessageTreatment();
break;
case Message.CLIENT_MESSAGE_CLOSE_CONNECTION:
// cerrar conexion de un usuario
this.closeConnectionTreatment();
break;
case Message.CLIENT_MESSAGE_GET_USERS:
// devolver lista
this.getConnectedUsersTreatment();
break;
default:
throw new IncorrectMessageException("The message type code does not exist");
}
}
}
/**
* generates a message from the data of the datagram
*
* @throws IncorrectMessageException If the message cannot be correctly created.
*/
private void generateMessage() throws IncorrectMessageException {
// obtain all the params from the datagram data
String ip = messageToProcces.getAddress().getHostAddress();
int port = messageToProcces.getPort();
User userFrom = userList.getUserByIpAndPort(ip, port);
User userTo = null;
String content = new String(messageToProcces.getData());
content = content.trim();
int id = Integer.parseInt(content.substring(0, 3));
if (content.length() > 4) {
// also eliminate the first &
content = content.substring(4);
} else {
content = null;
}
// obtain the destination user if the message should have it
if (Message.hasDestination(id)) {
try {
String[] splited = content.split("&");
String nickTo = splited[0];
userTo = userList.getUserByNick(nickTo);
if (splited.length > 1) {
content = content.substring(nickTo.length() + 1);
}
} catch (RuntimeException e) {
throw new IncorrectMessageException("Incorrect message. No destination user found");
}
}
// pass all the params to the message object
message.setFrom(userFrom);
message.setTo(userTo);
message.setText(content);
message.setMessageType(id);
}
private void getConnectedUsersTreatment() {
String listOfUsers = this.userList.toString();
sendDatagram(message.getFrom(), "207" + listOfUsers);
}