Examples of com.sun.midp.midlet.MIDletStateHandler

com.sun.midp.midlet.MIDletStateHandler
The MIDletStateHandler starts and controls MIDlets through the lifecycle states. MIDlets are created using its no-arg Constructor. Once created a MIDlet is sequenced through the ACTIVE, PAUSED, and DESTROYED states.
The MIDletStateHandler is a singleton for the suite being run and is retrieved with getMIDletStateHandler(). This allow the MIDletStateHandler to be the anchor of trust internally for the MIDP API, restricted methods can obtain the MIDletStateHandler for a MIDlet suite inorder to check the properties and actions of a suite. Because of this, there MUST only be one a MIDlet suite per MIDletStateHandler. In addition a method can assume that the application manager is the caller if there is no suite started.

The MIDlet methods are protected in the javax.microedition.midlet package so the MIDletStateHandler can not call them directly. The MIDletState object and MIDletTunnel subclass class allow the MIDletStateHandler to hold the state of the MIDlet and to invoke methods on it. The MIDletState instance is created by the MIDlet when it is constructed.
This implementation of the MIDletStateHandler introduces extra internal MIDlet states to allow processing of MIDlet requested state changes in the control thread and serialized with other state changes. The additional states are:
- ACTIVE_PENDING - The MIDlet is still PAUSED but will be ACTIVE after startApp is called when the state is next processed.
- PAUSE_PENDING - The MIDlet is still ACTIVE but will be PAUSED after pauseApp is called when the state is next processed.
- DESTROY_PENDING - Indicates that the MIDlet needs to be DESTROYED. The MIDlet's destroyApp has not yet been called.
The MIDletStateHandler loops, looking for MIDlets that require state changes and making the requested changes including calling methods in the MIDlet to make the change.
When a MIDlet's state is changed to ACTIVE, PAUSED, or DESTROYED the MIDlet state listener is notified of the change, which in turn sends the notification onto the central AMS. @see MIDlet @see MIDletPeer @see MIDletLoader @see MIDletStateHandler

     * @return the current application.
     */
    static AppProxy getCurrent() {
        synchronized (mutex) {
            if (currentApp == null) {
                MIDletStateHandler mh =
                    MIDletStateHandler.getMidletStateHandler();
                MIDletSuite msuite = mh.getMIDletSuite();
                try {
                    currentApp = (msuite != null) ?
                        new AppProxy(msuite,
                                     mh.getFirstRunningMidlet(),
                                     null) :
                        new AppProxy(MIDletSuite.INTERNAL_SUITE_ID, "");
                } catch (ClassNotFoundException cnfe) {
                    return null;
                }

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     *
     * @exception SecurityException if the suite calling does not have the
     * the AMS permission
     */
    public static Image getIcon() {
        MIDletStateHandler midletStateHandler =
            MIDletStateHandler.getMidletStateHandler();


        MIDletSuite suite = midletStateHandler.getMIDletSuite();


        suite.checkIfPermissionAllowed(Permissions.AMS);


        return trustedIcon;
    }

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     * Overridden from TestCase parent. This method will kick off each
     * individual test
     */
    public void runTests() {
        
        MIDletStateHandler msHandler = MIDletStateHandler.getMidletStateHandler();
        // Start a new instance of DummyMIDlet
        try {
            msHandler.startMIDlet("com.sun.midp.util.DummyMIDlet",
                                  "DummyMIDlet");
        } catch (Exception cnf) {
            return;
        }

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        if (!initMidpNativeStates(home)) {
           throw new RuntimeException("MIDP native initialization failed");
        }


  /** 
   * Making the runtime believe that this is a trusted midlet suite.
   * This is needed because in midp's code, security check is often done
   * by checking the executing midlet suite's security token.
   * See com.sun.midp.jump.installer.TrustedMIDletSuiteInfo for more
   * information.
   **/
  
        final MIDletStateHandler handler = MIDletStateHandler.getMidletStateHandler();
        MIDletSuite suite = handler.getMIDletSuite();
        if (suite == null) {
           AccessController.doPrivileged(new PrivilegedAction() {
              public Object run() {
      
                try {

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     *   calling thread while this method is waiting to preempt the
     *   display.
     */
    private void checkForPermission(String name)
            throws InterruptedIOException {
        MIDletStateHandler midletStateHandler;
        MIDletSuite midletSuite;


        midletStateHandler = MIDletStateHandler.getMidletStateHandler();
        midletSuite = midletStateHandler.getMIDletSuite();


        if (midletSuite == null) {
            throw new IllegalStateException("This class can't be used " +
                "before a suite is started.");
        }

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     * @return the registry for the Framework class
     */
    RegistryImpl getRegistry() {
  try {
      SecurityToken token = getSecurityToken();
      MIDletStateHandler mstate =
    MIDletStateHandler.getMidletStateHandler();
            MIDletSuite msuite = mstate.getMIDletSuite();
      msuite.setTempProperty(token, "MIDlet-1",
           "CHAPI Tests,," + classname);


      return RegistryImpl.getRegistryImpl(classname, token);
  } catch (SecurityException sx) {

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    public static byte[] readJarEntry(SecurityToken securityToken,
                               String jarFilePath, String entryName)
            throws IOException {


        if (securityToken == null) {
            MIDletStateHandler midletStateHandler =
                MIDletStateHandler.getMidletStateHandler();
            MIDletSuite midletSuite = midletStateHandler.getMIDletSuite();


            midletSuite.checkIfPermissionAllowed(Permissions.AMS);
        } else {
            securityToken.checkIfPermissionAllowed(Permissions.AMS);
        }

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