/*
 * This is a very simple example of how to use the HTTPClient package in an
 * Applet. It just POSTs a request to a cgi-script on the server when you
 * hit the 'Doit' button, and then displays the returned headers and data in
 * a text window.
 */

package HTTPClient.doc;

import java.applet.*;
import java.awt.*;
import HTTPClient.*;


public class HTTPClientExample extends Applet implements Runnable
{
    private HTTPConnection con;
    private HTTPResponse   rsp = null;
    private String         script = "/cgi-bin/my_script.cgi";

    private String         disp = "";
    private Thread         thread = null;
    private TextArea       text;


    public void init()
    {
	/* setup a text area and a button */

        setLayout(new BorderLayout());

	add("Center", text = new TextArea(60, 60));
	text.setEditable(false);

	add("South", new Button("Doit"));
 

	/* get an HTTPConnection */

        try
        {
	    con = new HTTPConnection(getCodeBase());
        }
        catch (Exception e)
        {
            disp = "Error creating HTTPConnection:\n" + e;
            repaint();
            return;
        }
    }

    public void start()
    {
	/* run the http request in a separate thread */

	if (thread == null)
	{
	    thread = new Thread(this);
	    thread.start();
	}
    }

    public void run()
    {
	try
	{
	    /* wait for the button to be pressed */

	    waitForDoit();

	    /* POST something to the script */

	    disp = "POSTing ...";
	    repaint();
	    rsp = con.Post(script, "Hello World again");
	    repaint();
	}
	catch (Exception e)
	{
	    disp = "Error POSTing: " + e;
	    e.printStackTrace();
	}
    }

    
    private synchronized void waitForDoit()
    {
	try { wait(); } catch (InterruptedException ie) { }
    }

    private synchronized void notifyDoit()
    {
	notify();
    }


    public void stop()
    {
	if (thread != null)
	{
	    thread.stop();
	    thread = null;
	}
    }


    public boolean action(Event evt, Object obj)
    {
	if (obj.equals("Doit"))
	{
	    notifyDoit();	// tell request thread to do the request
	    return true;
	}

	return super.action(evt, obj);
    }


    public void paint(Graphics g)
    {
	text.setText(disp + "\n");

	if (rsp == null) return;

	try
	{
	    text.appendText("\n---Headers:\n" + rsp.toString());
	    text.appendText("\n---Data:\n" + new String(rsp.getData(), 0) +
			    "\n");
	}
	catch (java.io.IOException ioe)
	{
	    text.appendText("\n---Got Exception:\n" + ioe + "\n");
	}
    }

}