Examples of javax.faces.application.NavigationHandler

javax.faces.application.NavigationHandler

A NavigationHandler is passed the outcome string returned by an application action invoked for this application, and will use this (along with related state information) to choose the view to be displayed next.

A default implementation of NavigationHandler must be provided by the JSF implementation, which will be utilized unless setNavigationHandler() is called to establish a different one. This default instance will compare the view identifier of the current view, the specified action binding, and the specified outcome against any navigation rules provided in faces-config.xml file(s). If a navigation case matches, the current view will be changed by a call to FacesContext.setViewRoot(). Note that a null outcome value will never match any navigation rule, so it can be used as an indicator that the current view should be redisplayed.

            ExceptionQueuedEvent event = it.next();
            ExceptionQueuedEventContext eqec = event.getContext();
            
            if(eqec.getException() instanceof ViewExpiredException) {
                FacesContext context = eqec.getContext();
                NavigationHandler navHandler = context.getApplication().getNavigationHandler();
 
                try {
                    navHandler.handleNavigation(context, null, "welcome.jsf?faces-redirect=true&expired=true");
                }
                finally {
                    it.remove();
                }
            }

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            ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource();


            Throwable t = context.getException();


            final FacesContext fc = FacesContext.getCurrentInstance();
            final NavigationHandler nav = fc.getApplication().getNavigationHandler();


            try {


                // change exception for different jpa provider as this is what
                // hibernate throws in case of optimistic lock failure.
                if (unwindException(t) instanceof StaleObjectStateException) {
                    FacesUtils.error("error.optimisticLocking");
                    nav.handleNavigation(fc, null, null);
                    fc.renderResponse();


                } else if (t instanceof ViewExpiredException) {


                    FacesUtils.error("error.sessionExpired");
                    nav.handleNavigation(fc, null, "/login.xhtml");
                    fc.renderResponse();


                }


            } finally {

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            ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource();


            Throwable t = context.getException();


            final FacesContext fc = FacesContext.getCurrentInstance();
            final NavigationHandler nav = fc.getApplication().getNavigationHandler();


            try {


                // change exception for different jpa provider as this is what
                // hibernate throws in case of optimistic lock failure.
                if (unwindException(t) instanceof StaleObjectStateException) {
                    FacesUtils.error("error.optimisticLocking");
                    nav.handleNavigation(fc, null, null);
                    fc.renderResponse();


                } else if (t instanceof ViewExpiredException) {


                    FacesUtils.error("error.sessionExpired");
                    nav.handleNavigation(fc, null, "/login.xhtml");
                    fc.renderResponse();


                }


            } finally {

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            FacesContext facesContext, UIOutcomeTarget component) throws IOException {
        String outcome = component.getOutcome();
        outcome = ((outcome == null) ? STR_EMPTY : outcome.trim());


        // Get the correct URL for the outcome.
        NavigationHandler nh = facesContext.getApplication().getNavigationHandler();
        if (!(nh instanceof ConfigurableNavigationHandler)) {
            throw new FacesException("Navigation handler must be an instance of " +
                    "ConfigurableNavigationHandler for using h:link or h:button");
        }
        ConfigurableNavigationHandler navigationHandler = (ConfigurableNavigationHandler) nh;

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      UIComponent source = event.getComponent();
      ActionSource actionSource = (ActionSource) source;
      Application application = facesContext.getApplication();
      MethodBinding binding = actionSource.getAction();
      // Retrieve the NavigationHandler instance..
      NavigationHandler navHandler = application.getNavigationHandler();
      // Invoke nav handling..
      String navBinding =
          (null != binding) ? binding.getExpressionString() : null;
      navHandler.handleNavigation(facesContext, navBinding,
          errorOutcome);
      // Trigger a switch to Render Response if needed
      facesContext.renderResponse();
    }
  }

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            FacesContext facesContext, UIOutcomeTarget component) throws IOException {
        String outcome = component.getOutcome();
        outcome = ((outcome == null) ? STR_EMPTY : outcome.trim());


        // Get the correct URL for the outcome.
        NavigationHandler nh = facesContext.getApplication().getNavigationHandler();
        if (!(nh instanceof ConfigurableNavigationHandler)) {
            throw new FacesException("Navigation handler must be an instance of " +
                    "ConfigurableNavigationHandler for using h:link or h:button");
        }
        ConfigurableNavigationHandler navigationHandler = (ConfigurableNavigationHandler) nh;

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        String outcome = component.getOutcome();
        outcome = (outcome == null) ? facesContext.getViewRoot().getViewId() : outcome;
        outcome = ((outcome == null) ? STR_EMPTY : outcome.trim());


        // Get the correct URL for the outcome.
        NavigationHandler nh = facesContext.getApplication().getNavigationHandler();
        if (!(nh instanceof ConfigurableNavigationHandler)) {
            throw new FacesException("Navigation handler must be an instance of " +
                    "ConfigurableNavigationHandler for using h:link or h:button");
        }
        ConfigurableNavigationHandler navigationHandler = (ConfigurableNavigationHandler) nh;

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            flowsWithId = new CopyOnWriteArrayList<Flow>();
            flowsByFlowId.put(id, flowsWithId);
        }
        flowsWithId.add(toAdd);
        
        NavigationHandler navigationHandler = context.getApplication().getNavigationHandler();
        if (navigationHandler instanceof ConfigurableNavigationHandler) {
            ((ConfigurableNavigationHandler)navigationHandler).inspectFlow(context, toAdd);
        }
        flowFeatureIsEnabled = true;
    }

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            }
        }


        // Retrieve the NavigationHandler instance..


        NavigationHandler navHandler = application.getNavigationHandler();


        // Invoke nav handling..


        navHandler.handleNavigation(context,
                                    (null != binding) ?
                                    binding.getExpressionString() : null,
                                    outcome);


        // Trigger a switch to Render Response if needed

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        String outcome = component.getOutcome();
        outcome = (outcome == null) ? facesContext.getViewRoot().getViewId()
                : outcome;
        outcome = ((outcome == null) ? STR_EMPTY : outcome.trim());
        // Get the correct URL for the outcome.
        NavigationHandler nh = facesContext.getApplication().getNavigationHandler();
        if (!(nh instanceof ConfigurableNavigationHandler))
        {
            throw new FacesException(
                    "Navigation handler must be an instance of "
                            + "ConfigurableNavigationHandler for using h:link or h:button");

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