Robot.java

import java.io.IOException;

/**
 * @author martin (cernama9@fit.cvut.cz)
 * @since 6.3.15.
 */

/**
 * The main Robot class. The Entry point of this application
 */
public final class Robot
{
	/**
	 * Application entry point
	 *
	 * @param args Program arguments (namely the TCP port to listen on)
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException
	{
		if (args.length != 1)
		{
			System.err.println("Server: java robot.Robot <port>");
			System.exit(1);
		}

		int port = 0;

		try
		{
			port = Integer.parseInt(args[0]);
		}
		catch (NumberFormatException e)
		{
			System.err.println("Please specify the port as a correct number");
			System.exit(2);
		}
		finally
		{
			if (port < 3000 || port > 3999)
			{
				System.err.println("Please specify a port within the range 3000 through 3999 (including)");
				System.exit(3);
			}
		}

		System.out.println("Starting server...\n");
		Server server = new Server(port);
		server.startServer();

	}
}