J2MEMixedRecordEnumerationExample.java Source code

Introduction

Here is the source code for J2MEMixedRecordEnumerationExample.java

Source

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;

public class J2MEMixedRecordEnumerationExample extends MIDlet implements CommandListener {
    private Display display;

    private Alert alert;

    private Form form = new Form("Mixed RecordEnumeration");

    private Command exit = new Command("Exit", Command.SCREEN, 1);

    private Command start = new Command("Start", Command.SCREEN, 1);

    private RecordStore recordstore = null;

    private RecordEnumeration recordEnumeration = null;

    public J2MEMixedRecordEnumerationExample() {
        display = Display.getDisplay(this);
        form.addCommand(exit);
        form.addCommand(start);
        form.setCommandListener(this);
    }

    public void startApp() {
        display.setCurrent(form);
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }

    public void commandAction(Command command, Displayable displayable) {
        if (command == exit) {
            destroyApp(true);
            notifyDestroyed();
        } else if (command == start) {
            try {
                recordstore = RecordStore.openRecordStore("myRecordStore", true);
                byte[] outputRecord;
                String outputString[] = { "First Record", "Second Record", "Third Record" };
                int outputInteger[] = { 15, 10, 5 };
                boolean outputBoolean[] = { true, false, true };
                ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
                DataOutputStream outputDataStream = new DataOutputStream(outputStream);
                for (int x = 0; x < 3; x++) {
                    outputDataStream.writeUTF(outputString[x]);
                    outputDataStream.writeBoolean(outputBoolean[x]);
                    outputDataStream.writeInt(outputInteger[x]);
                    outputDataStream.flush();
                    outputRecord = outputStream.toByteArray();
                    recordstore.addRecord(outputRecord, 0, outputRecord.length);
                }
                outputStream.reset();
                outputStream.close();
                outputDataStream.close();
                StringBuffer buffer = new StringBuffer();
                byte[] byteInputData = new byte[300];
                ByteArrayInputStream inputStream = new ByteArrayInputStream(byteInputData);
                DataInputStream inputDataStream = new DataInputStream(inputStream);
                recordEnumeration = recordstore.enumerateRecords(null, null, false);
                while (recordEnumeration.hasNextElement()) {
                    recordstore.getRecord(recordEnumeration.nextRecordId(), byteInputData, 0);
                    buffer.append(inputDataStream.readUTF());
                    buffer.append("\n");
                    buffer.append(inputDataStream.readBoolean());
                    buffer.append("\n");
                    buffer.append(inputDataStream.readInt());
                    buffer.append("\n");
                    alert = new Alert("Reading", buffer.toString(), null, AlertType.WARNING);
                    alert.setTimeout(Alert.FOREVER);
                    display.setCurrent(alert);
                }
                inputStream.close();
                recordstore.closeRecordStore();
                if (RecordStore.listRecordStores() != null) {
                    RecordStore.deleteRecordStore("myRecordStore");
                    recordEnumeration.destroy();
                }
            } catch (Exception error) {
                alert = new Alert("Error Removing", error.toString(), null, AlertType.WARNING);
                alert.setTimeout(Alert.FOREVER);
                display.setCurrent(alert);
            }
        }

    }
}