import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.Enumeration;
import java.io.IOException;
import java.io.DataOutputStream;
import javax.microedition.io.file.*;
import javax.microedition.io.*;

public class Midlet extends MIDlet implements CommandListener {

 private List rootList;
 private Form editMap;
 private ChoiceGroup mapType;
 private Command ok;
 private Command save;
 private Command exit;
 private String path;

 public void startApp() {
  rootList = new List("Выберите папку с картой", List.IMPLICIT);
  ok = new Command("Выбрать", Command.OK, 0);
  save = new Command("Сохранить", Command.OK, 0);
  exit = new Command("Выход", Command.EXIT, 0);
  editMap = new Form("Параметры карты");
  try{
   Enumeration e = FileSystemRegistry.listRoots();
   while(e.hasMoreElements()){
   rootList.append(e.nextElement().toString(), null);
   }
  }catch(SecurityException se){
  }
  rootList.addCommand(ok);
  rootList.addCommand(exit);
  rootList.setCommandListener(this);
  Display.getDisplay(this).setCurrent(rootList);
 }

 public void commandAction(Command c, Displayable d){
  int selindex = rootList.getSelectedIndex();
  path = "file://" +  rootList.getString(selindex) + "world.sav";
  byte b;
  if(c==ok){
   changeForm(editMap);
  }
  if(c==save){
   b = Byte.parseByte(new Integer(mapType.getSelectedIndex()).toString());
   try{
    writeWorld(path, b);
   }catch(IOException ioe){
   }
  }
  if(c==exit){
   destroyApp(true);
   notifyDestroyed();
  }
 }

 public void changeForm(Form f){
  mapType = new ChoiceGroup("Тип карты", ChoiceGroup.IMPLICIT);
  mapType.append("Выживание", null);
  mapType.append("Творчество", null);
  f.append(mapType);
  f.addCommand(save);
  f.addCommand(ok);
  f.setCommandListener(this);
  Display.getDisplay(this).setCurrent(f);
 }

 public void writeWorld(String path, byte b) throws IOException{
  byte[] ba = {b};
  int off = 1;
  FileConnection fc = (FileConnection)Connector.open(path);
  if(fc.exists()){
   DataOutputStream dos = fc.openDataOutputStream();
   dos.write(ba, off, off);
   dos.close();
  }
  else{
   throw new IOException("File doesn't exists");
  } 
  fc.close();
 }

 public void pauseApp() {
 }

 public void destroyApp(boolean unconditional) {
 }
}