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

public class Salv1 extends MIDlet implements CommandListener {
    TextField koord1 = new TextField("1. koordinaat", "", 5, TextField.NUMERIC);
    TextField koord2 = new TextField("2. koordinaat", "", 5, TextField.NUMERIC);
    Command c1 = new Command("Loe", Command.SCREEN, 1);
    Command c2 = new Command("Kirjuta", Command.SCREEN, 1);
    Form f = new Form("Salvesteerija");
    public Salv1() {
        f.append(koord1);
        f.append(koord2);
        f.addCommand(c1);
        f.addCommand(c2);
        f.setCommandListener(this);
        Display.getDisplay(this).setCurrent(f);
    }
    public void commandAction(Command p1, Displayable p2) {
        byte[] baidid;
        int[] indid = new int[2];
        try {
            RecordStore rs = RecordStore.openRecordStore("rs", true);
            // command == kirjuta
            if (p1 == c2) {
                indid[0] = Integer.parseInt(koord1.getString());
                indid[1] = Integer.parseInt(koord2.getString());
                baidid = i2b(indid);
                if (rs.getNumRecords()==0)
                    rs.addRecord(baidid, 0, baidid.length);
                else
                    rs.setRecord(1, baidid, 0, baidid.length);
            }
            // command == loe
            else {
                if (rs.getNumRecords()==0)
                    indid[0] = indid[1] = 0;
                else
                    indid = b2i(rs.getRecord(1));
                koord1.setString(String.valueOf(indid[0]));
                koord2.setString(String.valueOf(indid[1]));
            }
            rs.closeRecordStore();
        }
        catch(Exception e)
            e.printStackTrace();
    }
    protected void startApp() throws MIDletStateChangeException {}
    protected void pauseApp(){}
    protected void destroyApp(boolean kohustus) throws MIDletStateChangeException{}
    byte[] i2b(int[] i) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(bos);
        dos.writeInt(i[0]);
        dos.writeInt(i[1]);
        dos.close();     
        return bos.toByteArray();
    }
    int[] b2i(byte[] b) throws IOException {
        ByteArrayInputStream bis = new ByteArrayInputStream(b);
        DataInputStream dis = new DataInputStream(bis);
        int[] i = new int[2];
        i[0] = dis.readInt();
        i[1] = dis.readInt();
        return i;
    }
}