package com.j2medev.chapter10;

import java.io.IOException;
import java.io.InputStream;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.xml.parsers.*;
import org.xml.sax.SAXException;

public class ParseMIDlet extends MIDlet implements CommandListener,Runnable{
    
    private Display display = null;
    private Form form = null;
    private Thread thread = null;
    private Command parseCommand = new Command("parse",Command.OK,1);
    
    public void startApp() {
        if(display == null){
            display = Display.getDisplay(this);
            form = new Form("jaxp");
            //把document.xml的原始內容顯示在Form上
            InputStream is = getClass().getResourceAsStream("/document.xml");
            try {
                byte[] data = new byte[is.available()];
                is.read(data);
                form.append(new String(data));
                //正確顯示出來才添加parseCommand
                form.addCommand(parseCommand);
            } catch (IOException ex) {
                ex.printStackTrace();
                form.append(ex.getMessage());
            }
            form.addCommand(new Command("exit",Command.EXIT,1));
            form.setCommandListener(this);
        }
        display.setCurrent(form);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void commandAction(Command command, Displayable displayable) {
        if(command.getCommandType() == Command.EXIT){
            destroyApp(false);
            notifyDestroyed();
        }else if(command == parseCommand){
            //開始解析，在單獨的線程中完成。
            thread = new Thread(this);
            thread.start();
        }
    }
    
    public void run(){
        form.deleteAll();
        form.append("parsing the xml file");
        //創建SAXParserFactory實例
        SAXParserFactory instance = SAXParserFactory.newInstance();
        try {
            //創建SAXParser
            SAXParser parser = instance.newSAXParser();
            InputStream is = getClass().getResourceAsStream("/document.xml");
            //開始解析
            parser.parse(is,new MyHandler(form));
        } catch (ParserConfigurationException ex) {
            ex.printStackTrace();
        } catch (SAXException ex) {
            ex.printStackTrace();
        }catch(IOException ex){
            ex.printStackTrace();
        }
        form.removeCommand(parseCommand);
        display.setCurrent(form);
    }
}