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A protection domain is essentially a mapping between a set of permissions and a set of certificates that can be used to authenticate a given MIDlet. A permission is an object that represents the right to perform a restricted operation (see the Requesting Permissions section). When a MIDlet is installed, the AMS places it in a protection domain based on which certificate was used to digitally sign the MIDlet (or into a special domain for untrusted third-party MIDlets if the MIDlet is a MIDP 1 MIDlet and/or not signed). If the MIDlet attempts to perform an action that requires permission, the result depends on whether the permission is one that is granted to the MIDlet s protection domain. If it is (and if the MIDlet correctly requested the permission in its JAD file; see Requesting Permissions ), then the action is allowed without consulting the user. If not, the AMS will take over the display and show the user a system screen stating what restricted action the MIDlet would like to perform (such as sending an SMS to a given phone number; see Figure 8-1) and asking the user s permission. If the permission is not granted, the method call that required permission throws a SecurityException.

Attach a 50cm (20 inch) cable to the Sound Sensor. Leave the other end floating; you ll attach it in the next steps.

3. Click the Finish button. Then just sit back as the Application Block Software Factory does its magic. Your solution should look similar to Figure 14-6. Notice that the design-time configuration project, unit test projects, and application block project have been stubbed out for you.

CHAPTER 8 JOHNNXT IS ALIVE!

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Figure 14-6. New application block solution in the Solution Explorer The created class files are mostly just empty shells that need the guts created for them. To assist in this process, a series of TODO comments have been inserted in the files, as reminders of what still needs to be done to complete the application block. To simplify searching for all the TODO comments within an application, open the Task List window, and then select Comments in the drop-down list. All of the TODO comments will then be listed in the task list, as shown in the example in Figure 14-7.

Figure 8-1. The AMS shows a warning screen if an untrusted MIDlet attempts to perform a restricted action. A MIDP 2 or greater handset generally has four protection domains: the manufacturer domain, the operator domain, the identified third-party domain, and the unidentified thirdparty domain. (It is possible for the manufacturer to define other protection domains as well.) The manufacturer domain is the domain for all of those MIDlets signed by the handset manufacturer, and the operator domain is the domain for all of the MIDlets signed by the mobile network operator who provides the user s phone service. Both of these parties are implicitly trusted, so these two domains are granted the widest range of permissions. (The digital certificates for the operator domain may be stored in the device s smart card to allow the user to switch the device from one operator s network to another.) The identified third-party domain is the domain for MIDlets signed by a certificate that is granted by a recognized Certificate Authority (see the section Using Digital Certificates ). In MIDP 2, this domain was called the Trusted Third-Party Domain but the name was misleading because the only thing the Certificate

Note The TODO comments are not a complete list of what must be done to complete your specific custom application block, of course. You may need to take into account architecture and development considerations as well.

Insert the master NXT brick in place. Notice that the two long pins go in the holes on the NXT s back. Attach the Sound Sensor cable to port 1. Attach the left tread s motor to port C and the right tread s motor to port A.

/** * the canvas that all of the game will be drawn on. */ private JumpCanvas myCanvas; /** * the thread that advances the cowboy. */ private GameThread myGameThread; //----------------------------------------------------// initialization and game state changes /** * empty constructor. */ public Jump() { } /** * Switch the command to the play again command. */ void setNewCommand () { myCanvas.removeCommand(myPauseCommand); myCanvas.removeCommand(myGoCommand); myCanvas.addCommand(myNewCommand); } /** * Switch the command to the go command. */ private void setGoCommand() { myCanvas.removeCommand(myPauseCommand); myCanvas.removeCommand(myNewCommand); myCanvas.addCommand(myGoCommand); } /** * Switch the command to the pause command. */ private void setPauseCommand () { myCanvas.removeCommand(myNewCommand); myCanvas.removeCommand(myGoCommand); myCanvas.addCommand(myPauseCommand); } //----------------------------------------------------------------

With the initial application block stubbed out, the next task is to provide the necessary mechanism for consuming providers that will be associated with the application block. To do this, you need to run the New Provider Factory and Base recipe. 1. Open the Guidance Navigator (View Other Windows) and select the New Provider Factory and Base recipe. Expand the node and click Run This Recipe. 2. The New Provider Factory and Base dialog box appears. Here, you specify a provider name and indicate whether there will be only one implementation or multiple implementations for the provider. For this example, enter the name SampleProvider and set the provider type to There will be several different implementations of this provider type, as shown in Figure 14-8. Click Next.

CHAPTER 8 JOHNNXT IS ALIVE!

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