/**

TourGuide.java

An Applet by Rajiv Pant (Betul)

A web site navigator, also
a Tour Guide for your visit to a web site or a group of web sites.

Parameters can be set from calling html page so that other sites
may easily use this applet.

Aim of applet / Future Additions:

* To be fully customizable.
* Use full multimedia introductions to sites. (Of course, users can
turn off sound :-)

* If a page has special instructions for its introduction (which may
either be stored in the page itself on in the links file specified
as a parameter to the applet, the applet can do special things including:

   ** Open another window to display an introduction page.
   ** Parse the page and display it in parts explaing things.

 @version 1.00 1996/Mar/14
 @author Rajiv Pant (Betul)

*/

import java.awt.*;
import java.applet.*;
import java.net.*;
import java.io.*;
import java.util.* ; // for Hashtable

public class TourGuide extends Applet
{  public void init()
   {

      System.out.print ("\n\nHello.\n\n" ) ;

      setBackground (Color.white) ;

      boolean read = readLinksFile() ;

      setLayout(new BorderLayout());
      add("Center", links);

   }
   
   public boolean action(Event evt, Object arg)
   {  if (evt.target == links)
      {  try
         {  AppletContext context = getAppletContext();
            URL u = new URL ( (String) ( its_link.get ( (String)arg ) )  )  ;
            context.showDocument(u, getParameter("frame_name")) ;
         } catch(Exception e)
         {  showStatus("Error " + e);
         }
      }
      else return super.action(evt, arg);
      return true;
   }
   
   private List links = new List(10, false);
   Hashtable its_link = new Hashtable() ;

private boolean readLinksFile()
{

  System.out.print (
"I am going to read in the list of links now. \n\n"
) ;

  URL FileURL = null ;

  try
  {
     FileURL = new URL ( getParameter("links_file") ) ;
  }
  catch (MalformedURLException e)
  {
     showStatus("Error " + e) ;
  }


  try
  {
     InputStream in = FileURL.openStream() ;
     DataInputStream din = new DataInputStream (in) ;
     
     String description = "" ;
     String link        = "" ;

     while (  ( description = din.readLine() ) != null )
     {
        if ( (link = din.readLine() ) != null )
        {
          link = "http://" + link ;
          its_link.put (description, link) ;
          links.addItem (description) ;
          System.out.println ("Description: " + description) ;
          System.out.println ("Link:        " + link + "\n") ;
        }
     }

  }
  catch (IOException e)
  {
     showStatus("Error " + e) ;
  }

  return true ;
} // readLinksFile

}