///////    Factor.java    ///////
import java.awt.*;
import java.io.*;
import java.net.*;
import java.applet.*;
import java.awt.event.*;
import java.net.URLEncoder;

/**  
 *  Applet for polynomial factoring.
 *  A polynomial in infix notation is forwarded to a
 *  factoring server to retrieve all irreducible factors
 *  over the integers
 *  @author Paul S. Wang
 */

public class Factor extends Applet
{     public void init()
      {   browser = getAppletContext();
	  server = "http://SymbolicNet.mcs.kent.edu" + cgi;
	  tf = new TextField(30);
	  tf.setBackground(Color.cyan);
	  Button s = new Button(" Submit ");
	  add(tf); add(s);
	  s.addActionListener(new SubmitHandler());
      }

      private final class SubmitHandler
                    implements ActionListener
      {   public void actionPerformed(ActionEvent e)
          {   factor(tf.getText());
          }
      }

      protected void factor(String poly)
      { String to = "polynomial=" + URLEncoder.encode(poly);
	CgiClient cc = new CgiUrl(server);
	cc.postQuery(to);
        try 
	{  String msg = cc.readNextLine();
	   URL url = new URL(msg);
	   browser.showDocument(url, "_blank");
           //to = "delete=" + URLEncoder.encode(url.getFile());
           //CgiClient.post(server, to); 
	}  catch(MalformedURLException e) { JavaSystem.error(e); }
	   catch(IOException e) { JavaSystem.error(e); }
      }

      protected TextField tf;
      protected AppletContext browser;
      protected String server;
      static String cgi = "/cgi-bin/jfac?factor+y^3-x^3";
}