import java.awt.*;

import java.awt.event.*;        // for ActionListener, ActionEvent

import java.lang.Thread;

import java.io.*;

import java.util.Stack;



public class MenuLoader extends Thread 

{

    Menu           m;                // root menu to be loaded

    ActionListener l;                // will be called when a menu is clicked

    ActionListener doneListener;     // will be called when the loading is done

    BookmarkParser p;                // used to parse an HTML bookmark file



    public MenuLoader(Menu m, Reader r, ActionListener l) 

        throws IOException

    {

        this.m = m;

        this.p = new BookmarkParser(r);

        this.l = l;

    }



    public void addActionListener(ActionListener l){

        this.doneListener = l;

    }



    public void run()

    {    

        MenuBuilder b = new MenuBuilder(m, l);

 

        try{

        while( p.next() != BookmarkParser.EOF ){

            switch(p.getType()){

            case p.BOOKMARK:

                b.addBookmark(p.getName(), p.getLink());    

                break;

            case p.FOLDER:

                b.startSubmenu(p.getName());

                break;

            case p.FOLDER_END:

                b.endSubmenu();

                break;

            case p.SEPARATOR:

                b.addSeparator();

                break;

            default:

                break;

            }

        }//while



        notifyListener("done");



        }catch(IOException e){

            notifyListener("error");

        }



    }



    void notifyListener(String command){

        if( doneListener != null ) {

            doneListener.actionPerformed(

                new ActionEvent(this, 0, command)

            );

        }

    }





};





class MenuBuilder{



    Stack s = new Stack();

    ActionListener l;



    public MenuBuilder(Menu m, ActionListener l){

        s.push(m);

        this.l = l;

    }



    public void addBookmark(String name, String link){

        MenuItem i = new MenuItem(name);

        i.setActionCommand(link);

        i.addActionListener(l);

        getCurrentMenu().add(i);

    }

    public void addSeparator(){    getCurrentMenu().addSeparator();    }

    public void startSubmenu(String name){

        Menu sub = new Menu(name);

        getCurrentMenu().add(sub);

        s.push(sub);  

    }

    public void endSubmenu() {     s.pop();    }

    

    Menu    getCurrentMenu(){

        return (Menu)(s.peek());

    }



}