ClientConsole.java

// This file contains material supporting section 3.7 of the textbook:
// "Object Oriented Software Engineering" and is issued under the open-source
// license found at www.lloseng.com 

import java.io.*;

import common.*;

import client.*;

/**
 * This class constructs the UI for a chat client. It implements the
 * chat interface in order to activate the display() method.
 * Warning: Some of the code here is cloned in ServerConsole 
 *
 * @author François Bélanger
 * @author Dr Timothy C. Lethbridge 
 * @author Dr Robert Laganière
 * @version July 2000
 */
public class ClientConsole implements ChatIF 
{
	//Class variables *************************************************

	/**
	 * The default port to connect on.
	 */
	final public static int DEFAULT_PORT = 5555;

	//Instance variables **********************************************

	/**
	 * The instance of the client that created this ConsoleChat.
	 */
	ChatClient client;


	//Constructors ****************************************************

	/**
	 * Constructs an instance of the ClientConsole UI.
	 *
	 * @param host The host to connect to.
	 * @param port The port to connect on.
	 */
	public ClientConsole(String host, int port, String loginId) 
	{
		try 
		{
			client= new ChatClient(host, port, this, loginId);
		} 
		catch(IOException exception) 
		{
			display("Error: Can't setup connection!" + " Terminating client.");
			System.exit(1);
		}
	}


	//Instance methods ************************************************

	/**
	 * This method waits for input from the console. Once it is 
	 * received, it sends it to the client's message handler.
	 */
	public void accept() 
	{
		try
		{
			BufferedReader fromConsole = 
				new BufferedReader(new InputStreamReader(System.in));
			String message;

			while (true) 
			{
				message = fromConsole.readLine();
				client.handleMessageFromClientUI(message);
			}
		} 
		catch (Exception ex) 
		{
			display("Unexpected error while reading from console!");
		}
	}

	/**
	 * This method overrides the method in the ChatIF interface. It
	 * displays a message onto the screen.
	 *
	 * @param message The string to be displayed.
	 */
	public void display(String message) 
	{
		System.out.println(message);
	}


	//Class methods ***************************************************

	/**
	 * This method is responsible for the creation of the Client UI.
	 *
	 * @param args[0] The host to connect to.
	 */
	public static void main(String[] args) 
	{
		String host = "";
		int port = 0; //The port number
		String id = "";
		try
		{
			id = args[0];
		}catch(ArrayIndexOutOfBoundsException e){
			System.out.print("Put a user login id before trying to connect!");
			System.exit(1);
		}

		try
		{
			host = args[1];
		}
		catch(ArrayIndexOutOfBoundsException e)
		{
			host = "localhost";
		}
		
		try{
			port = Integer.parseInt(args[2]);
		}catch(ArrayIndexOutOfBoundsException e){
			port = DEFAULT_PORT;			
		}

		ClientConsole chat= new ClientConsole(host, port, id);
		chat.accept(); //Wait for console data
	}
}
//End of ConsoleChat class