/**
  * Create an URL for the given locale, bundle and page that can be dispatched by this dispatcher
  *
  * @param locale The desired locale
  * @param bundleName The bundle name, e.g. "org.olat.core"
  * @param page The page, e.g. "my-file.html"
  * @return
  */
 public static String createContextHelpURI(Locale locale, String bundleName, String page) {
   return WebappHelper.getServletContextPath()
       + PATH_CHELP
       + locale.toString()
       + "/"
       + bundleName
       + "/"
       + page;
 }
  /**
   * @see org.olat.core.dispatcher.Dispatcher#execute(javax.servlet.http.HttpServletRequest,
   *     javax.servlet.http.HttpServletResponse, java.lang.String)
   */
  @Override
  public void execute(HttpServletRequest request, HttpServletResponse response) {
    UserRequest ureq = null;

    try {
      String uriPrefix = DispatcherModule.getLegacyUriPrefix(request);
      ureq = new UserRequestImpl(uriPrefix, request, response);
      if (!ContextHelpModule.isContextHelpEnabled()) {
        // disabled context help - redirect immediately
        DispatcherModule.sendNotFound(ureq.getNonParsedUri(), response);
        return;
      }

      ChiefController cc =
          (ChiefController)
              Windows.getWindows(ureq.getUserSession()).getAttribute(CONTEXTHELPCHIEFCONTROLLER);
      // reuse existing chief controller for this user
      if (cc != null) {
        Window currentWindow = cc.getWindow();
        // Check if this is a start URL or a framework URL
        if (ureq.isValidDispatchURI()) {
          // A standard framework request, dispatch by component
          currentWindow.dispatchRequest(ureq, false);
          return;
        } else {
          // If path contains complete URL, dispose and start from scratch
          Windows.getWindows(ureq).deregisterWindow(currentWindow);
          cc.dispose();
        }
      }

      // Creator code to create
      // 1) the chief controller
      // 2) the layout controller
      // 3) the context help main controller
      ControllerCreator cHelpPopupWindowControllerCreator =
          new ControllerCreator() {
            public Controller createController(UserRequest lureq, WindowControl lwControl) {
              ControllerCreator cHelpMainControllerCreator =
                  new ControllerCreator() {
                    public Controller createController(UserRequest lureq, WindowControl lwControl) {
                      // create the context help controller and wrapp it using the layout controller
                      ContextHelpMainController helpCtr =
                          new ContextHelpMainController(lureq, lwControl);
                      LayoutMain3ColsController layoutCtr =
                          new LayoutMain3ColsController(
                              lureq, lwControl, null, null, helpCtr.getInitialComponent(), null);
                      layoutCtr.addDisposableChildController(helpCtr);
                      return layoutCtr;
                    }
                  };
              ContextHelpLayoutControllerCreator cHelpPopupLayoutCreator =
                  new ContextHelpLayoutControllerCreator(cHelpMainControllerCreator);
              return new BaseFullWebappPopupBrowserWindow(
                  lureq, lwControl, cHelpPopupLayoutCreator.getFullWebappParts());
            }
          };

      BaseChiefControllerCreator bbc = new BaseChiefControllerCreator();
      bbc.setContentControllerCreator(cHelpPopupWindowControllerCreator);
      cc = bbc.createChiefController(ureq);
      // add to user session for cleanup on user logout
      Windows.getWindows(ureq.getUserSession()).setAttribute(CONTEXTHELPCHIEFCONTROLLER, cc);
      Window currentWindow = cc.getWindow();
      currentWindow.setUriPrefix(WebappHelper.getServletContextPath() + PATH_CHELP);
      Windows.getWindows(ureq).registerWindow(currentWindow);
      // finally dispatch the initial request
      currentWindow.dispatchRequest(ureq, true);

    } catch (Throwable th) {
      try {
        ChiefController msgcc = MsgFactory.createMessageChiefController(ureq, th);
        // the controller's window must be failsafe also
        msgcc.getWindow().dispatchRequest(ureq, true);
        // do not dispatch (render only), since this is a new Window created as
        // a result of another window's click.
      } catch (Throwable t) {
        logError("Sorry, can't handle this context help request....", t);
      }
    }
  }