ChatConfiguration.java

// CSD 2013, Pablo Galdámez
import java.rmi.*;
import java.rmi.server.*;
import java.awt.*;
import java.awt.event.*;


//
// This file provides a basic and simple command line parsing to configure our chat programs.
// A ChatConfiguration is always ready to be used as a singleton object. This object must be 
// created at early stages. You can see ChatServer.java or ChatClient.java main() to realize where
// argument parsing occurs.
//

public class ChatConfiguration {
   private String nsHost = "localhost";
   //private int nsPort = 1099;
   private int nsPort = 9000; 
   private String serverName = "TestServer";
   private int myPort = 9001;
   private String channelName="#Friends";
   
   //
   // Singleton pattern
   //
   private static ChatConfiguration the_ = null;
   public static ChatConfiguration the () {return the_;}
   public ChatConfiguration () {the_ = this;}
      
   public static ChatConfiguration parse (String [] args) {
      ChatConfiguration conf = new ChatConfiguration();
      conf.parseArguments (args);
      return conf;
   }

   //
   // Configurable parameters
   //
   public String getNameServiceHost () {return nsHost;}
   public int getNameServicePort () {return nsPort;}
   public String getServerName () {return serverName;}
   public int getMyPort () {return myPort;}
   public String getChannelName() {return channelName;}

   //
   // Private functions to simplify usage.
   // 

   private void usage () {
      System.out.println ("USAGE ERROR");
      System.out.println ("Valid arguments are:");
      System.out.println ("   nshost=<host where rmiregistry is running>");
      System.out.println ("   nsport=<port where rmiregistry is listening>");
      System.out.println ("   server=<ChatServer name we want to use>");
      System.out.println ("   myport=<port number where this process will listen>");
      System.out.println ("   channel=<Channel name we want to use>");
      System.out.println ("");
      System.out.println ("Example:");
      System.out.println ("   nshost=pc0415.dsic.upv.es nsport=9000 server=test myport=9001");
      System.exit(1);
   }

   private void parseArguments (String [] args) {
     for (int i=0; i<args.length; i++) {
	 if (args[i].startsWith ("nshost=")) {
	    nsHost = args[i].substring(7); 
	 } else if (args[i].startsWith ("nsport=")) {
	    try {
	       nsPort  = new Integer (args[i].substring(7));
	    } catch (Exception e) {usage ();}
	 } else if (args[i].startsWith ("myport=")) {
	    try {
	       myPort  = new Integer (args[i].substring(7));
	    } catch (Exception e) {usage ();}
	 } else if (args[i].startsWith ("server=")) {
	    serverName = args[i].substring(7);
	 
	   } else if (args[i].startsWith ("channel=")) {
	    serverName = args[i].substring(8);   
	   } else { usage (); }
      }
   }

}