// A client to test the NextNumber server

import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.RMISecurityManager;
import java.rmi.NotBoundException;
import java.rmi.Naming;
import java.net.MalformedURLException;

public class NextNumberClient {
    public static void main(String[] args) {

        String urlServerStr = "";
        if( (args.length > 1) ||
            (args.length == 1 && !args[0].startsWith("rmi:")) ) {
           System.err.println(
           "Usage: java NextNumberCliente [rmi://host.domain:port/nextNumber]");
           System.exit(1);
        }
        else if ( args.length == 0 ) {
           urlServerStr = "rmi://localhost/nextNumber";
        }
        else {
           urlServerStr = args[0];
        }

	if (System.getSecurityManager() == null) {
	    System.setSecurityManager(new RMISecurityManager());
	}

	Remote r = null;	
	try {
	    r = Naming.lookup(urlServerStr);
        } catch (RemoteException ex) {
	    System.err.println("\n Couldn't contact registry.");
	    System.err.println("Are you sure you're running rmiregistry?");
	    System.exit(1);
	} catch (NotBoundException ex) {
	    System.err.println("\n There is no object bound to " + urlServerStr);
	    System.err.println(" Are you sure you ran the server?");
	    System.exit(1);
	} catch (MalformedURLException ex) {
	    System.err.println("\n The string " + urlServerStr + 
			       " is not a valid RMI URL");
	    System.err.println(" Make sure you use a " +
			       "properly-formatted rmi:// URL");
	    System.exit(1);
	}

	try {
	  if (r instanceof NextNumber) {
	    NextNumber nn = (NextNumber)r;
	    System.out.println("\n Next number after 1 is " +
				      nn.getNextNumber(1));
	    System.out.println(" Next number after 2 is " +
				      nn.getNextNumber(2));
	    System.out.println(" Next number after 3 is " +
				      nn.getNextNumber(3));
	  } else {
	    System.err.println("\n Uh oh, the name " +
		             	urlServerStr + "isn't a NextNumber");
	  }
	} catch (RemoteException ex) {
	  System.err.println("\n Couldn't start client: " +
		               ex.getMessage());
         ex.printStackTrace();
	}
    }
}