import java.applet.*;
import java.util.*;
import java.net.*;

public class MyAppletStub implements AppletStub {
  private Hashtable _properties;
  private Applet _applet;

/**
 * Creates a new MyAppletStub instance and initializes 
 * thei nit parameters from the command line.
 * Arguments are passed in as name=value pairs.
 * Reading the command line arguments can be made more
 * sophisciated depending on your needs, but the basic
 * idea will likely remain the same.
 * Also, this particular implementation doesn't deal
 * very well with invalid name=value pairs.
 * 
 * @param argv[] Command line arguments passed to Main
 * @param an Applet instance.
 */
  public MyAppletStub (String argv[ 
                          ], Applet a) {
    _applet = a;
    _properties = new Hashtable();
  }

  /**
   * Calls the applet's resize
   * @param width
   * @param height
   * @return void
   */
  public void appletResize (
     int width, int height) {
    _applet.resize (width, height);
  }

  /**
   * Returns the applet's context, which is 
   * null in this case. This is an area where more
   * creative programming
   * work can be done to try and provide a context
   * @return AppletContext Always null
   */ 
  public AppletContext getAppletContext () {
    return null;
  }

  /**
   * Returns the CodeBase. If a host parameter
   * isn't provided
   * in the command line arguments, the URL is based
   * on InetAddress.getLocalHost(). 
   * The protocol is "file:"
   * @return URL
   */
  public java.net.URL getCodeBase() {
    String host;
    if ( (host=getParameter (
      "host")) == null ) {
      try {
        host = InetAddress.getLocalHost(
                        ).getHostName();
      } catch (UnknownHostException e) {
        e.printStackTrace();
      }
    }
      
    java.net.URL u  = null;
    try {
      u = new java.net.URL (
       "file://"+host);
    } catch (Exception e) { }
    return u;
  }

  /**
   * Returns getCodeBase
   * @return URL
   */
  public java.net.URL getDocumentBase() {
    return getCodeBase();
  }

  /**
   * Returns the corresponding command line value
   * @return String
   */
  public String getParameter (
                    String p) {
    return (String)_properties.get (p);
  }

  /**
   * Applet is always true
   * @return boolean True
   */
  public boolean isActive () {
    return true;
  }
}