receivescreen.java

J2ME MIDP_Example_Applications

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
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// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
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// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
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// Corporation.
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// Sun Microsystems, Inc.
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import java.io.*;
import javax.microedition.lcdui.*;
import javax.wireless.messaging.*;

class ReceiveScreen
  extends Form
  implements CommandListener
{
  private final Command decodeCommand, backCommand;
  private final EncryptedSMSMIDlet parent;
  private final BinaryMessage message;
  private final TextField password;

  ReceiveScreen(EncryptedSMSMIDlet parent, BinaryMessage message)
  {
    super("Got Secured SMS");

    this.message = message;
    this.parent = parent;

    // init UI
    decodeCommand = new Command("Decode", Command.OK, 0);
    backCommand = new Command("Back", Command.BACK, 0);
    password = new TextField("Enter message's password",
                             "",
                             256,
                             TextField.PASSWORD);

    append("Recived message from " + message.getAddress());
    append(password);

    addCommand(decodeCommand);
    addCommand(backCommand);
    setCommandListener(this);
  }


  public void commandAction(Command cmd, Displayable displayable)
  {
    if (cmd == decodeCommand && password.getString().length()>0) {
      decode(message);
      removeCommand(decodeCommand);
    }
    if (cmd == backCommand) {
      parent.showMain();
    }
  }


  private void decode(BinaryMessage message)
  {
    try
    {
      byte payload[] = message.getPayloadData();
      // measure how long does it take to decrypt
      long difference = System.currentTimeMillis();
      String result = MessageCodec.decodeMessage(payload,
                                                 password.getString());
      difference = System.currentTimeMillis() - difference;
      StringBuffer msg = new StringBuffer("Decoded message in ")
        .append(difference)
        .append(" ms: ")
        .append(result);

      parent.showReport(msg.toString(), payload);
    }
    catch (Exception e)
    {
      parent.showMessage(e.getMessage());
    }

  }
}