Mixed Record Enumeration Example
/*
J2ME: The Complete Reference
James Keogh
Publisher: McGraw-Hill
ISBN 0072227109
*/
//jad file (please verify the jar size)
/*
MIDlet-Name: MixedRecordEnumerationExample
MIDlet-Version: 1.0
MIDlet-Vendor: MyCompany
MIDlet-Jar-URL: MixedRecordEnumerationExample.jar
MIDlet-1: MixedRecordEnumerationExample, ,
MixedRecordEnumerationExample
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-JAR-SIZE: 100
*/
import javax.microedition.rms.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.io.*;
public class MixedRecordEnumerationExample
extends MIDlet implements CommandListener
{
private Display display;
private Alert alert;
private Form form;
private Command exit;
private Command start;
private RecordStore recordstore = null;
private RecordEnumeration recordEnumeration = null;
public MixedRecordEnumerationExample ()
{
display = Display.getDisplay(this);
exit = new Command("Exit", Command.SCREEN, 1);
start = new Command("Start", Command.SCREEN, 1);
form = new Form("Mixed RecordEnumeration");
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 );
}
catch (Exception error)
{
alert = new Alert("Error Creating",
error.toString(), null, AlertType.WARNING);
alert.setTimeout(Alert.FOREVER);
display.setCurrent(alert);
}
try
{
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();
}
catch ( Exception error)
{
alert = new Alert("Error Writing",
error.toString(), null, AlertType.WARNING);
alert.setTimeout(Alert.FOREVER);
display.setCurrent(alert);
}
try
{
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();
}
catch (Exception error)
{
alert = new Alert("Error Reading",
error.toString(), null, AlertType.WARNING);
alert.setTimeout(Alert.FOREVER);
display.setCurrent(alert);
}
try
{
recordstore.closeRecordStore();
}
catch (Exception error)
{
alert = new Alert("Error Closing",
error.toString(), null, AlertType.WARNING);
alert.setTimeout(Alert.FOREVER);
display.setCurrent(alert);
}
if (RecordStore.listRecordStores() != null)
{
try
{
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);
}
}
}
}
}
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