Record Monitor : RecordStore « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. RecordStore

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.rms.RecordListener;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreNotFoundException;

public class RecordMonitorMIDlet extends MIDlet implements CommandListener, RecordListener {
  private Command exitCommand = new Command("Exit", Command.EXIT, 1);

  private Command deleteCommand= new Command("Delete", Command.SCREEN, 1);

  private Command changeCommand = new Command("Edit", Command.SCREEN, 1);

  private Display display;

  RecordStore mainRS = null;

  RecordStore backupRS = null;

  public RecordMonitorMIDlet() {
    display = Display.getDisplay(this);
  }

  public void startApp() {
    TextBox aTextBox = new TextBox("Main", null, 256, TextField.ANY);

    byte[] nameEmail = null;
    boolean existingOrNot = false;
    boolean OK = true;

    existingOrNot = existing("aRS1");
    if (existingOrNot) {
      try {
        mainRS = RecordStore.openRecordStore("aRS1", false);
        mainRS.addRecordListener(this);
      } catch (Exception e) {
        OK = false;
      } finally {
        if (OK) {
          aTextBox.setString("Ok");
        } else {
          aTextBox.setString("Failed");
        }
      }
    } else {
      try {
        mainRS = RecordStore.openRecordStore("aRS1", true);
        mainRS.addRecordListener(this);
      } catch (Exception e) {
        OK = false;
      } finally {
        if (OK) {
          aTextBox.setString("Ok");
        } else {
          aTextBox.setString("Falied");
        }
      }
    }

    if (OK)
      try {
        backupRS = RecordStore.openRecordStore("aRS2", true);
      } catch (Exception e) {
      }
    if (OK)
      try {
        nameEmail = "JIDCA=login@yourname.net".getBytes();

        mainRS.addRecord(nameEmail, 0, nameEmail.length);
        aTextBox.setString("Added");
      } catch (Exception e) {
        aTextBox.setString("Add Falied");
      }

    String result = new String(nameEmail);
    int position = result.indexOf('=');
    result = "Name:" + result.substring(0, position) + "\n" + "E-mail?"
        + result.substring(position + 1, result.length());
    aTextBox.setString(result);

    try {
      int recordID = mainRS.getNextRecordID() - 1;
      byte[] newNameEmail = "Logis=login@yourname.net".getBytes();
      mainRS.setRecord(recordID, newNameEmail, 0, newNameEmail.length);
      recordID = mainRS.getNextRecordID() - 1;
      mainRS.deleteRecord(recordID);
    } catch (Exception e) {
    }

    aTextBox.addCommand(exitCommand);
    aTextBox.addCommand(deleteCommand);
    aTextBox.addCommand(changeCommand);
    aTextBox.setCommandListener(this);
    display.setCurrent(aTextBox);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
    try {
      if (mainRS != null) {
        mainRS.closeRecordStore();
      }
    } catch (Exception e) {
    }
    try {
      if (backupRS != null) {
        backupRS.closeRecordStore();
      }
    } catch (Exception e) {
    }
  }

  public boolean existing(String recordStoreName) {
    boolean existingOrNot = false;
    RecordStore mainRS = null;
    if (recordStoreName.length() > 32)
      return false;
    try {
      mainRS = RecordStore.openRecordStore(recordStoreName, false);
    } catch (RecordStoreNotFoundException e) {
      existingOrNot = false;
    } catch (Exception e) {
    } finally {
      try {
        mainRS.closeRecordStore();
      } catch (Exception e) {
      }
    }
    return existingOrNot;

  }

  public void commandAction(Command c, Displayable s) {
    if (c == deleteCommand) {
      try {
        int recordID = mainRS.getNextRecordID() - 1;
        mainRS.deleteRecord(recordID);
      } catch (Exception e) {
      }
    } else if (c == changeCommand) {
      try {
        int recordID = mainRS.getNextRecordID() - 1;
        byte[] newNameEmail = "Logis=login@yourname.net".getBytes();
        mainRS.setRecord(recordID, newNameEmail, 0, newNameEmail.length);
      } catch (Exception e) {
      }
    } else {
      destroyApp(false);
      notifyDestroyed();
    }
  }

  public void recordAdded(RecordStore recordStore, int recordID) {
    if (recordStore == mainRS) {
      try {
        byte[] data = recordStore.getRecord(recordID);
        int recID = backupRS.addRecord(data, 0, data.length);
      } catch (Exception e) {
      }
    }
  }

  public void recordChanged(RecordStore recordStore, int recordID) {
    if (recordStore == mainRS) {
      try {
        byte[] data = recordStore.getRecord(recordID);
        backupRS.setRecord(recordID, data, 0, data.length);
      } catch (Exception e) {
      }
    }
  }

  public void recordDeleted(RecordStore recordStore, int recordID) {
    if (recordStore == mainRS) {
      try {
        backupRS.deleteRecord(recordID);
      } catch (Exception e) {
      }
    }
  }
}

31.47.RecordStore
	31.47.1.	Load yahoo stock quote
	31.47.2.	Add records to RecordStore
	31.47.3.	delete RecordStore
	31.47.4.	Filter Fields
	31.47.5.	Get record from RecordStore
	31.47.6.	Save data to RecordStore
	31.47.7.	Record Monitor
	31.47.8.	Retrieve All
	31.47.9.	Sort Fields
	31.47.10.	Record Enumeration
	31.47.11.	RecordStore read and write
	31.47.12.	Read and write mixed data types with RecordStore
	31.47.13.	Mixed Record Enumeration
	31.47.14.	Sort records in RecordStore
	31.47.15.	Sort Mixed Record DataType
	31.47.16.	Search record in RecordStore
	31.47.17.	Search Mixed Record Data Type