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}.

  }


  private String generateUrl(FacesContext facesContext, AbstractUICommandBase component) {
    String url;
    Application application = facesContext.getApplication();
    ViewHandler viewHandler = application.getViewHandler();
    ExternalContext externalContext = facesContext.getExternalContext();


    if (component.getResource() != null) {
      boolean jsfResource = component.isJsfResource();
      url = ResourceManagerUtils.getPageWithoutContextPath(facesContext, component.getResource());
      if (url != null) {
        if (jsfResource) {
          url = viewHandler.getActionURL(facesContext, url);
          url = externalContext.encodeActionURL(url);
        } else {
          url = viewHandler.getResourceURL(facesContext, url);
          url = externalContext.encodeResourceURL(url);
        }
      } else {
        url = "";
      }

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        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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  }


  private String generateUrl(FacesContext facesContext, AbstractUICommandBase component) {
    String url;
    Application application = facesContext.getApplication();
    ViewHandler viewHandler = application.getViewHandler();
    ExternalContext externalContext = facesContext.getExternalContext();


    if (component.getResource() != null) {
      boolean jsfResource = component.isJsfResource();
      url = ResourceManagerUtils.getPageWithoutContextPath(facesContext, component.getResource());
      if (url != null) {
        if (jsfResource) {
          url = viewHandler.getActionURL(facesContext, url);
          url = externalContext.encodeActionURL(url);
        } else {
          url = viewHandler.getResourceURL(facesContext, url);
          url = externalContext.encodeResourceURL(url);
        }
      } else {
        url = "";
      }
    } else if (component.getLink() != null) {


      String link = component.getLink();
      if (link.startsWith("/")) { // internal absolute link
        url = viewHandler.getActionURL(facesContext, link);
        url = externalContext.encodeActionURL(url);
      } else if (link.contains(":")) { // external link
        url = link;
      } else { // internal relative link
        url = externalContext.encodeResourceURL(link);

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 */
class RenderResponseExecutor implements PhaseExecutor {


  public boolean execute(FacesContext facesContext) {
    Application application = facesContext.getApplication();
    ViewHandler viewHandler = application.getViewHandler();


    try {
      final UIViewRoot viewRoot = facesContext.getViewRoot();
      if (viewRoot.getViewId() != null) {
        viewHandler.renderView(facesContext, viewRoot);
      } else {
        throw new FacesException("Can't render, because the viewId is <null>.");
      }
    } catch (IOException e) {
      throw new FacesException(e.getMessage(), e);

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            context = fcf.getFacesContext(servlet.getServletContext(),
                                          request, response, lifecycle);
        }


        // Create a new view root
        ViewHandler vh = context.getApplication().getViewHandler();
        if (log.isTraceEnabled()) {
            log.trace("  Creating new view for '" + uri + "'");
        }
        context.setViewRoot(vh.createView(context, uri));


        // Cause the view to be rendered
        if (log.isTraceEnabled()) {
            log.trace("  Rendering view for '" + uri + "'");
        }

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            context = fcf.getFacesContext(servlet.getServletContext(),
                                          request, response, lifecycle);
        }


        // Create a new view root
        ViewHandler vh = context.getApplication().getViewHandler();
        if (log.isTraceEnabled()) {
            log.trace("  Creating new view for '" + uri + "'");
        }
        context.setViewRoot(vh.createView(context, uri));


        // Cause the view to be rendered
        if (log.isTraceEnabled()) {
            log.trace("  Rendering view for '" + uri + "'");
        }

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            parameters = Collections.emptyMap();
        }
        // In theory the precedence order to deal with params is this:
        // component parameters, navigation-case parameters, view parameters
        // getBookmarkableURL deal with this details.
        ViewHandler viewHandler = facesContext.getApplication().getViewHandler();
        String href = viewHandler.getBookmarkableURL(facesContext,
                navigationCase.getToViewId(facesContext),
                parameters, navigationCase.isIncludeViewParams() || component.isIncludeViewParams());
        // handle fragment (viewId#fragment)
        String fragment = (String) component.getAttributes().get("fragment");
        if (fragment != null)

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@Deprecated
class RenderResponseExecutor implements PhaseExecutor {


  public boolean execute(FacesContext facesContext) {
    Application application = facesContext.getApplication();
    ViewHandler viewHandler = application.getViewHandler();


    try {
      final UIViewRoot viewRoot = facesContext.getViewRoot();
      if (viewRoot.getViewId() != null) {
        viewHandler.renderView(facesContext, viewRoot);
      } else {
        Object respObj = facesContext.getExternalContext().getResponse();
        if (respObj instanceof HttpServletResponse) {
            HttpServletResponse respHttp = (HttpServletResponse) respObj;
            respHttp.sendError(HttpServletResponse.SC_NOT_FOUND);

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        }
      }
    }


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


    boolean postBack = isPostBack(facesContext);
    if (postBack) {
      viewRoot = viewHandler.restoreView(facesContext, viewId);
    }
    if (viewRoot == null) {
      viewRoot = viewHandler.createView(facesContext, viewId);
      viewRoot.setViewId(viewId);
      facesContext.renderResponse();
    }


    facesContext.setViewRoot(viewRoot);

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