Main {
	(@
	static public void main(String args[]) throws Exception {
		Account a = new Account();

		Username u = new Username();			
	 	Password p = new Password();
		Password pv = new Password();

		BufferedReader inputLine;
		String input = new String();

		boolean operational = true;
		boolean flag = true;

		// print welcome message
				
		BrokerSim b = BrokerSim.parse(new FileInputStream("../../Broker.input"));

		a = null;
		while(operational) {
			while (a == null) {
				System.out.println("\n\n------------------------------");
				System.out.println("Log On to the Brokerage System");
				System.out.println("------------------------------\n");

				System.out.print("Username : ");
				inputLine = new BufferedReader (new InputStreamReader(System.in));
				input = inputLine.readLine();
				u = new Username(input);

				if (input.equals("quit")) {
					System.out.println("see ya");
					// print exit message;
					operational = false;
					break;
				}
			
				a = b.check_Username(u);

				if (a != null) {
					System.out.print("Password : ");
					inputLine = new BufferedReader (new InputStreamReader(System.in));
					input = inputLine.readLine();
					if (input.equals(a.get_password().get_pword())) {
						System.out.println("Good");
						b.loggedOn(a);
					}
					else {
						System.out.println("\nInvalid Password");
						a = null;
					}
				}
				else {
					System.out.println("Invalid Username");
					// create new Account
					// Remember to addElement to the List(Account)...
				}
			}
		}
	}
	@)
}

BrokerSim {

	// list traversals...

	loggedOn(Account a)
	(@

	@)
}

BrokerSim {
	traversal checkAccount (checkUsernameVisitor cv) { through AccountList to Username; }
	Account check_Username(Username username)
	(@
		Account a = new Account();
		checkUsernameVisitor cv = new checkUsernameVisitor();
		cv.set_username(username);
		this.checkAccount(cv);
		a = cv.get_return_val();
		return a;
	@)
}

checkUsernameVisitor {
	init (@ account = null; @)
	before Account
	(@ caccount = host; @)
	before Username
	(@
		if (host.get_uname().equals(username.get_uname())) {
			account = caccount; 
		}
	@)
	return Account (@ account @)
}

BrokerSim {
	traversal all(DisplayVisitor)
		{to *;}

	// traversal checkAccount(CheckVisitor)

	(@
	void displayAll() {
		DisplayVisitor dv = new DisplayVisitor();
		this.all(dv);
		return;
	}
	@)
}