Examples of javax.faces.application.ViewHandler

javax.faces.application.ViewHandler

ViewHandler is the pluggablity mechanism for allowing implementations of or applications using the JavaServer Faces specification to provide their own handling of the activities in the Render Response and Restore View phases of the request processing lifecycle. This allows for implementations to support different response generation technologies, as well as alternative strategies for saving and restoring the state of each view.

Please see {@link StateManager} for information on how theViewHandler interacts the {@link StateManager}.

        LOG.debug("*** '" + entry.getKey() + "' -> '" + entry.getValue() + "'");
      }
    }


    Application application = facesContext.getApplication();
    ViewHandler viewHandler = application.getViewHandler();
    String viewId = facesContext.getViewRoot().getViewId();
    String formAction = viewHandler.getActionURL(facesContext, viewId);
    formAction = facesContext.getExternalContext().encodeActionURL(formAction);
    String contentType = writer.getContentTypeWithCharSet();
    ResponseUtils.ensureContentTypeHeader(facesContext, contentType);
    String clientId = page.getClientId(facesContext);
    final ClientProperties client = VariableResolverUtils.resolveClientProperties(facesContext);

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    writer.startElement(HtmlElements.DIV, page);
    writer.writeClassAttribute(Classes.create(page, "menuStore"));
    writer.endElement(HtmlElements.DIV);


    Application application = facesContext.getApplication();
    ViewHandler viewHandler = application.getViewHandler();


    writer.startElement(HtmlElements.SPAN, null);
    writer.writeIdAttribute(clientId + ComponentUtils.SUB_SEPARATOR + "jsf-state-container");
    writer.flush();
    if (!FacesContextUtils.isAjax(facesContext)) {
      if (FacesVersion.supports12()) {
        viewHandler.writeState(facesContext);
      } else {
        // catch the next written stuff into a string and look if it is empty (TOBAGO-909)
        FastStringWriter buffer = new FastStringWriter(40); // usually only the marker...
        TobagoResponseWriter originalWriter = (TobagoResponseWriter) facesContext.getResponseWriter();
        writer = (TobagoResponseWriter) writer.cloneWithWriter(buffer);
        facesContext.setResponseWriter(writer);
        viewHandler.writeState(facesContext);
        final String stateContent = buffer.toString();
        writer = originalWriter;
        facesContext.setResponseWriter(writer);


        if (StringUtils.isBlank(stateContent)) {

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        Util.notNull("context", context);


        CaseStruct caseStruct = getViewId(context, fromAction, outcome);
        if (caseStruct != null) {
            ExternalContext extContext = context.getExternalContext();
            ViewHandler viewHandler = Util.getViewHandler(context);
            assert (null != viewHandler);
            if (caseStruct.navCase.isRedirect()) {
                // perform a 302 redirect.
                String redirectUrl =
                      viewHandler.getRedirectURL(context,
                                                 caseStruct.viewId,
                                                 SharedUtils.evaluateExpressions(context, caseStruct.navCase.getParameters()),
                                                 caseStruct.navCase.isIncludeViewParams());
                try {
                    if (logger.isLoggable(Level.FINE)) {
                        logger.fine("Redirecting to path " + redirectUrl
                                    + " for outcome " + outcome +
                                    "and viewId " + caseStruct.viewId);
                    }
                    // encode the redirect to ensure session state
                    // is maintained
                    clearViewMapIfNecessary(context, caseStruct.viewId);
                    updateRenderTargets(context, caseStruct.viewId);
                    extContext.getFlash().setRedirect(true);
                    extContext.redirect(redirectUrl);
                } catch (java.io.IOException ioe) {
                    if (logger.isLoggable(Level.FINE)) {
                        logger.log(Level.FINE,"jsf.redirect_failed_error",
                                   redirectUrl);
                    }
                    throw new FacesException(ioe.getMessage(), ioe);
                }
                context.responseComplete();
               if (logger.isLoggable(Level.FINE)) {
                   logger.fine("Response complete for " + caseStruct.viewId);
               }
            } else {
                UIViewRoot newRoot = viewHandler.createView(context,
                                                            caseStruct.viewId);
                updateRenderTargets(context, caseStruct.viewId);
                context.setViewRoot(newRoot);
                if (logger.isLoggable(Level.FINE)) {
                    logger.fine("Set new view in FacesContext for " +

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            } else {
                viewIdToTest = "/" + viewIdToTest;
            }
        }


        ViewHandler viewHandler = Util.getViewHandler(context);
        viewIdToTest = viewHandler.deriveViewId(context, viewIdToTest);


        if (null != viewIdToTest) {
            CaseStruct caseStruct = new CaseStruct();
            caseStruct.viewId = viewIdToTest;
            caseStruct.navCase = new NavigationCase(currentViewId,

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            if (viewId == null) {
                throw new FacesException(MessageUtils.getExceptionMessageString(
                  MessageUtils.NULL_REQUEST_VIEW_ERROR_MESSAGE_ID));
            }


            ViewHandler viewHandler = Util.getViewHandler(facesContext);


            boolean isPostBack = (facesContext.isPostback() && !isErrorPage(facesContext));
            if (isPostBack) {
                facesContext.setProcessingEvents(false);
            // try to restore the view
                viewRoot = viewHandler.restoreView(facesContext, viewId);
                if (viewRoot == null) {
                    if (is11CompatEnabled(facesContext)) {
                        // 1.1 -> create a new view and flag that the response should
                        //        be immediately rendered
                        if (LOGGER.isLoggable(Level.FINE)) {
                            LOGGER.fine("Postback: recreating a view for " + viewId);
                        }
                        viewRoot = viewHandler.createView(facesContext, viewId);
                        facesContext.renderResponse();


                    } else {
                        Object[] params = {viewId};
                        throw new ViewExpiredException(
                                MessageUtils.getExceptionMessageString(
                                MessageUtils.RESTORE_VIEW_ERROR_MESSAGE_ID,
                                params),
                                viewId);
                    }
                }


                facesContext.setViewRoot(viewRoot);
                facesContext.setProcessingEvents(true);
                if (LOGGER.isLoggable(Level.FINE)) {
                    LOGGER.fine("Postback: restored view for " + viewId);
                }
            } else {
                if (LOGGER.isLoggable(Level.FINE)) {
                    LOGGER.fine("New request: creating a view for " + viewId);
                }


                String derivedViewId = viewHandler.deriveLogicalViewId(facesContext, viewId);
                ViewDeclarationLanguage vdl = viewHandler.getViewDeclarationLanguage(facesContext, derivedViewId);


                if (vdl != null) {
                    // If we have one, get the ViewMetadata...
                    ViewMetadata metadata = vdl.getViewMetadata(facesContext, viewId);

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            try {
                context.setProcessingEvents(false);
                ViewDeclarationLanguage vdl = vdlFactory.getViewDeclarationLanguage(viewId);
                viewRoot = vdl.getViewMetadata(context, viewId).createMetadataView(context);
                context.setViewRoot(viewRoot);
                ViewHandler outerViewHandler = context.getApplication().getViewHandler();
                String renderKitId = outerViewHandler.calculateRenderKitId(context);
                ResponseStateManager rsm = RenderKitUtils.getResponseStateManager(context, renderKitId);
                Object[] rawState = (Object[]) rsm.getState(context, viewId);
                if (rawState != null) {
                    Map<String, Object> state = (Map<String, Object>) rawState[1];
                    if (state != null) {

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        // Get Application instance
        Application application = context.getApplication();
        assert (application != null);


        // Get the ViewHandler
        ViewHandler viewHandler = application.getViewHandler();
        assert (viewHandler != null);


        return viewHandler;
    }

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    }
    if (!viewId.startsWith("/")) {
      throw new IllegalArgumentException(
          "Illegal view Id for build AJAX Action URL: " + viewId);
    }
    ViewHandler viewHandler = context.getApplication().getViewHandler();
    String actionURL = viewHandler.getActionURL(context, viewId);
    // HACK - check for a Jboss PortletBridge implementation. If present, append DirectLink attribute to url.
    // TODO - how to detect portlet application ?
    if (null != context.getExternalContext().getApplicationMap().get(
        "org.jboss.portletbridge.application.PortletStateHolder")) {
      // Mark Ajax action url as transparent with jsf-portlet bridge.

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  /**
   * @param facesContext
   * @return String A String representing the action URL
   */
  public String getActionUrl(FacesContext facesContext) {
    ViewHandler viewHandler = facesContext.getApplication()
        .getViewHandler();
    String viewId = facesContext.getViewRoot().getViewId();
    return viewHandler.getActionURL(facesContext, viewId);
  }

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        UIViewRoot viewRoot;
        
        /*
         * Check if we are stateless.
         */
        ViewHandler outerViewHandler = context.getApplication().getViewHandler();
        String renderKitId = outerViewHandler.calculateRenderKitId(context);
        ResponseStateManager rsm = RenderKitUtils.getResponseStateManager(context, renderKitId);
                
        if (rsm.isStateless(context, viewId))  {
            try {
                ViewDeclarationLanguage vdl = vdlFactory.getViewDeclarationLanguage(viewId);
                viewRoot = vdl.createView(context, viewId);
                context.setViewRoot(viewRoot);
                vdl.buildView(context, viewRoot);
                return viewRoot;
            } catch (IOException ioe) {
                throw new FacesException(ioe);
            }
        }
        
        if (StateContext.getStateContext(context).isPartialStateSaving(context, viewId)) {
            try {
                context.setProcessingEvents(false);
                ViewDeclarationLanguage vdl = vdlFactory.getViewDeclarationLanguage(viewId);
                viewRoot = vdl.getViewMetadata(context, viewId).createMetadataView(context);
                context.setViewRoot(viewRoot);
                outerViewHandler = context.getApplication().getViewHandler();
                renderKitId = outerViewHandler.calculateRenderKitId(context);
                rsm = RenderKitUtils.getResponseStateManager(context, renderKitId);
                Object[] rawState = (Object[]) rsm.getState(context, viewId);
                if (rawState != null) {
                    Map<String, Object> state = (Map<String, Object>) rawState[1];
                    if (state != null) {

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