Login Navigation Handler

Question

Hello,
I would like to implement a navigation handler to control access to some pages, in the sense that if the user is not logged in, he/she cannot access some pages.
So let's say the user is not logged in, clicks on some menu link, gets redirected to the login page, logs in, and then is redirected to the page he wanted to access.
I can't manage to figure out how to do the last part.
My navigation handler:
public class LoginNavigationHandler extends NavigationHandler {
     NavigationHandler _base;
     String actionNameCurrent;
     String actionMethodCurrent;
     public LoginNavigationHandler (NavigationHandler base) {
          super();
          _base = base;     
     public void handleNavigation(FacesContext fc, String actionMethod, String actionName) {
                actionNameCurrent = actionName;
                actionMethodCurrent = actionMethod;
                HttpSession session = (HttpSession)fc.getExternalContext().getSession(false);
                LoginBean  loginManager = (LoginBean)session.getAttribute(LoginBean.BEAN_MAPPING);
                if (loginManager == null){
                     loginManager = new LoginBean();
                     loginManager.setLoggedIn(false);
                     session.setAttribute(LoginBean.BEAN_MAPPING, loginManager);
                if (actionNameCurrent!=null) {
                     if (actionNameCurrent.equals(PageEnum.NAV_PAGE_RETURN_BACK)) {
                          navigationCase4ReturningBack(fc, loginManager);
                     navigationCase4Login(fc, loginManager);
                _base.handleNavigation(fc, actionMethodCurrent, actionNameCurrent);
     private void navigationCase4Login(FacesContext fc, LoginBean loginManager) {
          //if not logged in and not navigating to login page
          if (!loginManager.isLoggedIn() &&
                   !actionNameCurrent.equals(PageEnum.NAV_PAGE_LOGIN)) {
               //store the current navigation position
               loginManager.setPreviousAction(actionNameCurrent);
               loginManager.setPreviousMethod(actionMethodCurrent);
               loginManager.setPreviousViewId(fc.getViewRoot().getViewId());                    
               System.out.println("Set previous action name "+actionNameCurrent);          
               //if not navigating to one of the publicly available pages
               if (!actionNameCurrent.equals(PageEnum.NAV_PAGE_PRODUCTSLIST)
                      && !actionNameCurrent.equals(PageEnum.NAV_PAGE_REGISTER)                    
                      && !actionNameCurrent.equals(PageEnum.NAV_PAGE_CONTACT)){
                    //redirect to login page
                    actionNameCurrent = PageEnum.NAV_PAGE_LOGIN;                    
     private void navigationCase4ReturningBack(FacesContext fc, LoginBean loginManager) {
          if (loginManager.isLoggedIn()) {
               //restore the previous navigation position                
               actionNameCurrent = loginManager.getPreviousAction();
               actionMethodCurrent = loginManager.getPreviousMethod();
               fc.getViewRoot().setViewId(loginManager.getPreviousViewId());                
}I have a menu, each menu item has an action (method is called 'init' but I also have some items with actionListeners associated to them).
What happens is this: onclick, the action/actionListener method is called, then the navigation handler gets called. I'd like to invert the order, because I need the user's data before loading page content. Any way to do this?
I've tried parsing the actionMethod string to get the bean name and invoke init method by reflection, but in the case of the menu items with actionlisteners it does not work :(
Thanks.

Answer 1

I've solved the problem:
private void navigationCase4ReturningBack(FacesContext fc, LoginBean loginManager) {
     if (loginManager.isLoggedIn()) {
          //restore the previous navigation position                
          actionNameCurrent = loginManager.getPreviousAction();
          actionMethodCurrent = loginManager.getPreviousMethod();
          fc.getViewRoot().setViewId(loginManager.getPreviousViewId());
          try{
               if (actionMethodCurrent != null && !actionMethodCurrent.isEmpty()){
                       ELContext elContext = fc.getELContext();
                     ExpressionFactory ef = fc.getApplication().getExpressionFactory();
                     MethodExpression me = ef.createMethodExpression(elContext, actionMethodCurrent, String.class, new Class[] {});
                     me.invoke(elContext, null);
           }catch(Exception e){
               e.printStackTrace();
     }