/*******************************************************************
Title:       Java FingerApplet Client
Authors:     Dr. Roger Webster
Date:        April 19, 1998
Filename:    FingerApplet.java
WWW server:  http://cs.millersv.edu/
*******************************************************************/
import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;

/** 
 * This applet connects to the "finger" server on the host
 * it was served from to determine who is currently logged on.
 * Because it is an untrusted applet, it can only connect to the host
 * from which it came.  Since web servers do not usually run finger
 * servers themselves, this applet will often be used in conjunction
 * with a proxy server, to serve it from some other host that does run
 * a finger server.
 **/

public class FingerApplet extends Applet implements Runnable 
{
  	Button who;  
    	DataInputStream in;
        PrintStream out;
	String returnline;
	Socket socket;
	Thread mythread;
	TextField  name = new TexField(40);
	List mylist = new List (60, false);

  	public void init() 
	{
    		who = new Button("Show who is Logged on");
    		who.setFont(new Font("SansSerif", Font.PLAIN, 14));
    		this.add(who);
	    	this.add(name);
		this.show();
	
  	}

  /**
   * This is the method that does the networking and displays the results.
   * It is implemented as the body of a separate thread because it might
   * take some time to complete, and applet methods need to return promptly.
   **/
  public void run() 
  {
 
   try 
    {   
    	// Find out  who's logged on
      	// Connect to port 79 (the standard finger port) on the host
      	// that the applet was loaded from.

	Connect();

  	ReadSocket();

        PopUpWindow window = new PopUpWindow("Who is on", returnline);

    }
    catch(Exception e) //RWW added to catch ALL
    {
         e.printStackTrace();
         PopUpWindow window = new PopUpWindow(" Problems", e.toString());
          System.out.println("Socket Exception:" + e.toString());
    }

 }

// uses the jdk1.0.2 event handler...
        public boolean handleEvent(Event event)
        {
                int x, y;
                switch (event.id)
                {

                   case Event.ACTION_EVENT:
                   {
 			System.out.println("mouse down");
                        x = event.x;
                        y = event.y;
  			new Thread(this).start();
                   }
		}
		return true;
	}
 
 	public void ReadSocket()
        {
        // Send a blank line to the finger server, telling it that we want
        // a listing of everyone logged on instead of information about an
        // individual user.
             StringBuffer mystring = new StringBuffer(578); 
             String line;
             try
                {  
                        out.println();
      			out.flush();    // Send it now!

                        for(;;)
                        {
                                line = in.readLine();
		System.out.println("line:" + line + "\n");

				if (line == null) break;

				mystring.append(line);
	System.out.println("mystring.append:" + mystring.toString() + "\n");


                        }

                        returnline = mystring.toString();
                }
                catch(Exception e)
                {
                        e.printStackTrace();
                        System.out.println("Error:" + e.toString());
                        PopUpWindow window = new PopUpWindow("Problems read socket", e.toString());


                }
        }

  
	public void Connect()
        {
                try
                {  
                        socket = new Socket(this.getCodeBase().getHost(), 79);
                        out = new PrintStream(socket.getOutputStream());
                        in = new DataInputStream(socket.getInputStream());

                }
                catch(Exception e) //RWW added to catch ALL
                {
                        e.printStackTrace();
                        PopUpWindow window = new PopUpWindow("Socket Problems", e.toString());
                        System.out.println("Socket Exception:" + e.toString());
                }

        }

} // end init class


class PopUpWindow extends Frame
{
        public Panel buttonPanel;
        public Button close;

        public PopUpWindow(String title, String mesg){
                //Instantiate variables
                super(title);
                Label return_message = new Label(mesg);
                buttonPanel = new Panel();
                close = new Button("OK");

                //Add button to panel and panel to window
                setLayout(new FlowLayout());
                buttonPanel.setLayout(new GridLayout(2,1));
                buttonPanel.add(return_message);
                buttonPanel.add(close);
                add(buttonPanel);

                //Size window to preferred size
                this.reshape(100, 100, 500, 550);
                move(150,300);
                close.requestFocus();
                show();
        }//end PopUpWindow(String, String)
 //  uses the jdk1.0.2 event handler...
        public boolean action(Event e, Object arg){
                if(e.target instanceof Button){
                        if(e.target == close){
                                if(this.isShowing())
                                {
                                        dispose();
                                }
                        }
                }
                return true;
        }//end action(Event, Object)
}//end class definition