import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;
import java.io.*;

public class HotelDemo extends MIDlet implements CommandListener {

    private Command exitCommand, backCommand, nextCommand, saveCommand;
    private Display display;    // The display for this MIDlet
    private List menu;
    private Form fr1;
    private TextField tf1, tf2, tf3, tf4;
    private RecordEnumeration enum;
    private ByteArrayOutputStream bout = new ByteArrayOutputStream();
    private DataOutputStream dout = new DataOutputStream(bout);
    private RecordStore rs;
    private byte [] data = null;
    private ByteArrayInputStream bin;
    private DataInputStream din = null;
   
    public HotelDemo() {
        display = Display.getDisplay(this);
        exitCommand = new Command("Exit", Command.SCREEN, 1);
        nextCommand = new Command("Next", Command.BACK, 2);
        saveCommand = new Command("Save", Command.BACK, 2);
        backCommand = new Command("Back", Command.BACK, 2);
    }



    public void startApp() {
        menu = new List("Hotel List", Choice.IMPLICIT);
        menu.append("Add", null);
        menu.append("Show All", null);
        menu.addCommand(exitCommand);
        menu.setCommandListener(this);     
        display.setCurrent(menu);

        fr1 = new Form("Hotel");
        fr1.append("Name");
        tf1 = new TextField("", "", 15, TextField.ANY);
        fr1.append(tf1);
        fr1.append("Phone");
        tf2 = new TextField("", "", 15, TextField.PHONENUMBER);
        fr1.append(tf2);
        fr1.append("Zone");
        tf3 = new TextField("", "", 10, TextField.ANY);
        fr1.append(tf3);
        fr1.append("Price");
        tf4 = new TextField("", "", 10, TextField.NUMERIC);
        fr1.append(tf4);
        fr1.addCommand(backCommand);
        fr1.setCommandListener(this);
        
        openRecord();
    }
    

    public void resetScreen() {
        setScreen("", "", "", "");
    }
    
    public void setScreen(String name, String tel, String zone, String price) {
        tf1.setString(name);
        tf2.setString(tel);
        tf3.setString(zone);
        tf4.setString(price);
    }

    public void openRecord() {
        try {
            rs = RecordStore.openRecordStore("Hotel", true);            
        } catch (RecordStoreException ex) {
        }
    }
    

    public void addRecord(String name, String phone, String zone, int price) {
        try {
            dout.writeUTF(name);
            dout.writeUTF(phone);
            dout.writeUTF(zone);
            dout.writeInt(price);
            dout.flush();
        }catch (IOException ex) {
        }

        byte[] data = bout.toByteArray();
        try {
            rs.addRecord(data, 0, data.length);
        } catch (RecordStoreFullException ex) {
        } catch (RecordStoreException ex) {
        }       
    }
    
    public void pauseApp() {
    }


    public void destroyApp(boolean unconditional) {
        try {
            rs.closeRecordStore();            
        } catch (RecordStoreException ex) {
        }  
    }

    public void storeData() {
        String name = tf1.getString();
        String tel = tf2.getString();
        String zone = tf3.getString();
        int price = Integer.parseInt(tf4.getString());
        addRecord(name, tel, zone, price);
    }
    

    public void nextRecord() {
        try {
             
            if (enum.hasNextElement()) { 
                int id = enum.nextRecordId();
                int size = rs.getRecordSize(id);
                                
                if (data == null || data.length < size) {
                    data = new byte[size + 20];
                    bin = new ByteArrayInputStream(data);
                    din = new DataInputStream(bin);
                }
                rs.getRecord(id, data, 0);
                din.reset();
                String name = din.readUTF();
                String tel = din.readUTF();
                String zone = din.readUTF();
                int price = din.readInt();
                setScreen(name, tel, zone, price + "");
            }
        }catch (Exception ex) {   
	}
        
    }
    public void commandAction(Command c, Displayable s) {
        if (c == exitCommand) {
            destroyApp(false);
            notifyDestroyed();
        } else if (c == backCommand) {
            fr1.removeCommand(nextCommand);
            fr1.removeCommand(saveCommand);
           display.setCurrent(menu);
        } else if (c == saveCommand) {
            storeData();
            fr1.removeCommand(saveCommand);
            display.setCurrent(menu);
        } else if (c == nextCommand) {
            nextRecord();
          } else if (c == List.SELECT_COMMAND) {
             switch(((List) s).getSelectedIndex()) {
                case 0 : 
                    fr1.addCommand(saveCommand);
                    display.setCurrent(fr1);
                    resetScreen();
                    break;
                case 1 : 
                    try {
                        if (enum != null) {
                            enum.destroy();
                        }
                        enum = rs.enumerateRecords(null, null, true);
                        fr1.addCommand(nextCommand);
                        display.setCurrent(fr1);
                        nextRecord();
                    } catch(Exception ex) {
                    }
            }
        }
    }
}