smartticket.java

值得一看的J2ME_J2EE结合使用经典例程

            startLoading(true, getMsg(MessageConstants.MOVIES));
        } else if (d == accountForm) {
            if (c == cancelCmd) {
                display.setCurrent(splashCanvas);
                return;
            }
            
            try {
                accountForm.validateAll();
            } catch (Exception e) {
                Alert a = createAlert(getMsg(MessageConstants.ERROR));
                a.setString(e.getMessage());
                display.setCurrent(a, accountForm);
                return;
            }
            
	    session.message = MessageConstants.CREATE_USER;
            nextScreen = splashCanvas;
            previousScreen = accountForm;
            alertScreen = createAlert(getMsg(MessageConstants.HAVE_ACCOUNT));
            startLoading(false, getMsg(MessageConstants.CREATING_USER));
        } else if (d == movieList) {
            if (c == backCmd) {
                display.setCurrent(signedInForm);
                return;
            }
            
            if (session.previewMode == AccountForm.PREVIEW_NONE) {
		session.message = MessageConstants.DISPLAY_LOCATIONS;
                nextScreen = locationList;
                previousScreen = movieList;
                startLoading(true, getMsg(MessageConstants.LOADING_LOCS));
            } else {
		session.message = MessageConstants.DISPLAY_POSTER;
                nextScreen = posterCanvas;
                previousScreen = movieList;
                startLoading(true, getMsg(MessageConstants.LOADING_POSTER));
            }
        } else if (d == posterCanvas) {
            if (c == backCmd) {
                display.setCurrent(movieList);
                return;
            }
	    session.message = MessageConstants.DISPLAY_LOCATIONS;
            nextScreen = locationList;
            previousScreen = movieList;
            startLoading(true, getMsg(MessageConstants.LOADING_LOCS));
        } else if (d == locationList) {
            if (c == backCmd) {
                display.setCurrent(movieList);
                return;
            }
            session.message = MessageConstants.DISPLAY_SHOWTIMES;
            nextScreen = showtimeList;
            previousScreen = locationList;
            startLoading(true, getMsg(MessageConstants.LOADING_SHOWTIMES));
        } else if (d == showtimeList) {
            if (c == backCmd) {
                display.setCurrent(locationList);
                return;
            }
            session.message = MessageConstants.DISPLAY_SEATINGPLAN;
            nextScreen = seatingCanvas;
            previousScreen = showtimeList;
            startLoading(true, getMsg(MessageConstants.LOADING_PLAN));
        } else if (d == seatingCanvas) {
            if (c == cancelCmd) {
                display.setCurrent(showtimeList);
                return;
            }
            session.message = MessageConstants.RESERVE_SEATS;
            nextScreen = confirmForm;
            previousScreen = seatingCanvas;
            startLoading(false, getMsg(MessageConstants.RESERVING_SEATS));
        } else if (d == confirmForm) {
            if (c == cancelCmd) {
		session.message = MessageConstants.CANCEL_SEATS;
                nextScreen = movieList;
                previousScreen = confirmForm;
                alertScreen = 
		    createAlert(getMsg(MessageConstants.PURCHASE_CANCELLED));
                startLoading(false, 
		    getMsg(MessageConstants.CANCELLING_PURCHASE));
                return;
            }

	    // check that we have the last 4 digits
	    if (confirmForm.getCreditCardCheck().length() < 4) {
		return;
	    }

            session.message = MessageConstants.CONFIRM_SEATS;
            nextScreen = splashCanvas;
            previousScreen = confirmForm;
            alertScreen = createAlert(getMsg(MessageConstants.THANK_YOU));
            startLoading(false, getMsg(MessageConstants.CONFIRMING_PURCHASE));
        }
    }

    /* Helper methods. */

    /**
     * Load the base servlet URL. This URL is concatenated with the
     * session id at login time. Subsequent logins use the base URL.
     */
    String getBaseServletURL() {
        return getAppProperty("SMARTicket-Servlet-URL");
    }

    /**
     * Start an operation that requires a separate thread.
     *
     * @param  stoppable  indicates whether the operation can be stopped
     *                    by the user.
     * @param  title  the title of the progress gauge to show to the user.
     * @see  stopLoading()
     */
    void startLoading(boolean stoppable, String title) {
        gaugeForm.init(title, stoppable);
        display.setCurrent(gaugeForm);
        new Thread(session).start();
    }
    
    /**
     * Finish the operation that required a separate thread.
     *
     * @see  startLoading(Runnable, boolean, String), stopLoading(Exception)
     */
    public void stopLoading() {
        if (alertScreen != null) {
            display.setCurrent(alertScreen, nextScreen);
            alertScreen = null;
        } else {
            display.setCurrent(nextScreen);
        }
        
        previousScreen = null;
        nextScreen = null;
    }

    /**
     * Finish the operation that required a separate thread, but ended
     * prematurely (either because it was stopped or encountered an exception.)
     *
     * @see  startLoading(Runnable, boolean, String), stopLoading()
     */
    public void stopLoading(Exception e) {
        if (gaugeForm.stopped) {
            display.setCurrent(previousScreen);
            return;
        }
        
        Alert alert = createAlert(e.getMessage() != null
                                  ? e.getMessage()
                                  : getMsg(MessageConstants.CANNOT_CONNECT));
        display.setCurrent(alert, previousScreen);
    }
    
    /**
     * Create an alert with the given message.
     */
    Alert createAlert(String message) {
        Alert result = new Alert(getMsg(MessageConstants.SMART_TICKET));
        result.setTimeout(Alert.FOREVER);
        result.setString(message);
        return result;
    }

    /**
     * Update the progress gauge with the given value.
     */
    public void updateGauge(int value) throws ApplicationException {
        gaugeForm.update(value);
    }
    
    /**
     * Initialize the table of localized messages.
     */
    private void initMsg() {
        msgTab = new String[MessageConstants.NUM_MSG];
	DataInputStream isr = null;

        try {
	    RecordStore rs = session.openMessageStore(false);
	    if (rs != null && 
		locale.equals(new String(rs.getRecord(1))) == false) {
		isr = new DataInputStream(
		    new ByteArrayInputStream(rs.getRecord(2)));
	    } else {
		InputStream is = 
		    getClass().getResourceAsStream("/default.properties");
		isr = new DataInputStream(is);
	    }

            if (isr != null) {
                int c, idx;
                int i = 0, msgid = 0;
                byte cb[] = new byte[1];
                byte buf[] = new byte[100];
                String l;
                while ((c = isr.read(cb, 0, 1)) != -1) {

                    // Consider both \n and \r to be line terminators.
                    // Hopefully that covers all platforms.  Note that
                    // we ignore any line not containing an "=", and
                    // that includes empty lines.
                    if (cb[0] == (byte)'\n' || cb[0] == '\r') {
                        l = new String(buf, 0, i);
                        i = 0;
                        idx = l.indexOf('=');
                        if (idx > 0) {
                            msgTab[msgid++] = l.substring(idx+1);
                        }
                    } else {
                        buf[i++] = cb[0];
                    }
                }
            }
        } catch (Exception e) {
	    // do nothing
        }
    }

    /**
     * Return the localized message for the given key.
     */
    protected static String getMsg(int key) {
        return msgTab[key] != null ? msgTab[key] : "General application error";
    }
}