/* Intentionally private for singleton */
  private CatService(
      CommandsInterface ci,
      UiccCardApplication ca,
      IccRecords ir,
      Context context,
      IccFileHandler fh,
      UiccCard ic) {
    if (ci == null || ca == null || ir == null || context == null || fh == null || ic == null) {
      throw new NullPointerException("Service: Input parameters must not be null");
    }
    mCmdIf = ci;
    mContext = context;

    // Get the RilMessagesDecoder for decoding the messages.
    mMsgDecoder = RilMessageDecoder.getInstance(this, fh);

    // Register ril events handling.
    mCmdIf.setOnCatSessionEnd(this, MSG_ID_SESSION_END, null);
    mCmdIf.setOnCatProactiveCmd(this, MSG_ID_PROACTIVE_COMMAND, null);
    mCmdIf.setOnCatEvent(this, MSG_ID_EVENT_NOTIFY, null);
    mCmdIf.setOnCatCallSetUp(this, MSG_ID_CALL_SETUP, null);
    // mCmdIf.setOnSimRefresh(this, MSG_ID_REFRESH, null);

    mIccRecords = ir;
    mUiccApplication = ca;

    // Register for SIM ready event.
    mUiccApplication.registerForReady(this, MSG_ID_SIM_READY, null);
    mIccRecords.registerForRecordsLoaded(this, MSG_ID_ICC_RECORDS_LOADED, null);

    // Check if STK application is availalbe
    mStkAppInstalled = isStkAppInstalled();

    CatLog.d(this, "Running CAT service. STK app installed:" + mStkAppInstalled);
  }
  /**
   * Used for instantiating/updating the Service from the GsmPhone or CdmaPhone constructor.
   *
   * @param ci CommandsInterface object
   * @param ir IccRecords object
   * @param context phone app context
   * @param fh Icc file handler
   * @param ic Icc card
   * @return The only Service object in the system
   */
  public static CatService getInstance(CommandsInterface ci, Context context, UiccCard ic) {
    UiccCardApplication ca = null;
    IccFileHandler fh = null;
    IccRecords ir = null;
    if (ic != null) {
      /* Since Cat is not tied to any application, but rather is Uicc application
       * in itself - just get first FileHandler and IccRecords object
       */
      ca = ic.getApplicationIndex(0);
      if (ca != null) {
        fh = ca.getIccFileHandler();
        ir = ca.getIccRecords();
      }
    }
    synchronized (sInstanceLock) {
      if (sInstance == null) {
        if (ci == null || ca == null || ir == null || context == null || fh == null || ic == null) {
          return null;
        }
        HandlerThread thread = new HandlerThread("Cat Telephony service");
        thread.start();
        sInstance = new CatService(ci, ca, ir, context, fh, ic);
        CatLog.d(sInstance, "NEW sInstance");
      } else if ((ir != null) && (mIccRecords != ir)) {
        if (mIccRecords != null) {
          mIccRecords.unregisterForRecordsLoaded(sInstance);
        }

        if (mUiccApplication != null) {
          mUiccApplication.unregisterForReady(sInstance);
        }
        CatLog.d(sInstance, "Reinitialize the Service with SIMRecords and UiccCardApplication");
        mIccRecords = ir;
        mUiccApplication = ca;

        // re-Register for SIM ready event.
        mIccRecords.registerForRecordsLoaded(sInstance, MSG_ID_ICC_RECORDS_LOADED, null);
        mUiccApplication.registerForReady(sInstance, MSG_ID_SIM_READY, null);
        CatLog.d(sInstance, "sr changed reinitialize and return current sInstance");
      } else {
        CatLog.d(sInstance, "Return current sInstance");
      }
      return sInstance;
    }
  }