@Override
public View resolveViewName(String viewName, Locale locale) throws BeansException {
	ApplicationContext context = getApplicationContext();
	if (!context.containsBean(viewName)) {
		if (logger.isDebugEnabled()) {
			logger.debug("No matching bean found for view name '" + viewName + "'");
		}
		// Allow for ViewResolver chaining...
		return null;
	}
	if (!context.isTypeMatch(viewName, View.class)) {
		if (logger.isDebugEnabled()) {
			logger.debug("Found matching bean for view name '" + viewName +
					"' - to be ignored since it does not implement View");
		}
		// Since we're looking into the general ApplicationContext here,
		// let's accept this as a non-match and allow for chaining as well...
		return null;
	}
	return context.getBean(viewName, View.class);
}
 

private ModelAndView getModelAndView(ModelAndViewContainer mavContainer,
		ModelFactory modelFactory, NativeWebRequest webRequest) throws Exception {

	modelFactory.updateModel(webRequest, mavContainer);
	if (mavContainer.isRequestHandled()) {
		return null;
	}
	ModelMap model = mavContainer.getModel();
	ModelAndView mav = new ModelAndView(mavContainer.getViewName(), model);
	if (!mavContainer.isViewReference()) {
		mav.setView((View) mavContainer.getView());
	}
	if (model instanceof RedirectAttributes) {
		Map<String, ?> flashAttributes = ((RedirectAttributes) model).getFlashAttributes();
		HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
		RequestContextUtils.getOutputFlashMap(request).putAll(flashAttributes);
	}
	return mav;
}
 

@Override
public ModelAndView resolveModelAndView(Method handlerMethod,
		Class handlerType,
		Object returnValue,
		ExtendedModelMap implicitModel,
		NativeWebRequest webRequest) {
	if (returnValue instanceof MySpecialArg) {
		return new ModelAndView(new View() {
			@Override
			public String getContentType() {
				return "text/html";
			}

			@Override
			public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response)
					throws Exception {
				response.getWriter().write("myValue");
			}

		});
	}
	return UNRESOLVED;
}
 

@Test
public void resolveViewNameWithAcceptHeader() throws Exception {
	request.addHeader("Accept", "application/vnd.ms-excel");

	Map<String, MediaType> mapping = Collections.singletonMap("xls", MediaType.valueOf("application/vnd.ms-excel"));
	MappingMediaTypeFileExtensionResolver extensionsResolver = new MappingMediaTypeFileExtensionResolver(mapping);
	ContentNegotiationManager manager = new ContentNegotiationManager(new HeaderContentNegotiationStrategy());
	manager.addFileExtensionResolvers(extensionsResolver);
	viewResolver.setContentNegotiationManager(manager);

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));

	View viewMock = mock(View.class, "application_xls");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(null);
	given(viewResolverMock.resolveViewName(viewName + ".xls", locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn("application/vnd.ms-excel");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock, result);
}
 

@Test
public void resolveViewNameWithRequestParameter() throws Exception {
	request.addParameter("format", "xls");

	Map<String, MediaType> mapping = Collections.singletonMap("xls", MediaType.valueOf("application/vnd.ms-excel"));
	ParameterContentNegotiationStrategy paramStrategy = new ParameterContentNegotiationStrategy(mapping);
	viewResolver.setContentNegotiationManager(new ContentNegotiationManager(paramStrategy));

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));
	viewResolver.afterPropertiesSet();

	View viewMock = mock(View.class, "application_xls");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(null);
	given(viewResolverMock.resolveViewName(viewName + ".xls", locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn("application/vnd.ms-excel");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock, result);
}
 

@Test
public void resolveViewNoMatch() throws Exception {
	request.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9");

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));

	viewResolver.afterPropertiesSet();

	View viewMock = mock(View.class, "application_xml");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn("application/pdf");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertNull("Invalid view", result);
}
 

@Test
public void resolveViewNameAcceptHeader() throws Exception {
	request.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");

	ViewResolver viewResolverMock1 = mock(ViewResolver.class);
	ViewResolver viewResolverMock2 = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Arrays.asList(viewResolverMock1, viewResolverMock2));

	viewResolver.afterPropertiesSet();

	View viewMock1 = mock(View.class, "application_xml");
	View viewMock2 = mock(View.class, "text_html");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock1.resolveViewName(viewName, locale)).willReturn(viewMock1);
	given(viewResolverMock2.resolveViewName(viewName, locale)).willReturn(viewMock2);
	given(viewMock1.getContentType()).willReturn("application/xml");
	given(viewMock2.getContentType()).willReturn("text/html;charset=ISO-8859-1");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock2, result);
}
 

@Test
public void resolveViewContentTypeNull() throws Exception {
	request.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));

	viewResolver.afterPropertiesSet();

	View viewMock = mock(View.class, "application_xml");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn(null);

	View result = viewResolver.resolveViewName(viewName, locale);
	assertNull("Invalid view", result);
}
 

@Test
public void testCacheRemoval() throws Exception {
	StaticWebApplicationContext wac = new StaticWebApplicationContext();
	wac.setServletContext(new MockServletContext());
	wac.refresh();
	InternalResourceViewResolver vr = new InternalResourceViewResolver();
	vr.setViewClass(JstlView.class);
	vr.setApplicationContext(wac);

	View view = vr.resolveViewName("example1", Locale.getDefault());
	View cached = vr.resolveViewName("example1", Locale.getDefault());
	if (view != cached) {
		fail("Caching doesn't work");
	}

	vr.removeFromCache("example1", Locale.getDefault());
	cached = vr.resolveViewName("example1", Locale.getDefault());
	if (view == cached) {
		// the chance of having the same reference (hashCode) twice if negligible).
		fail("View wasn't removed from cache");
	}
}
 

@Test
public void resolveViewNoMatchUseUnacceptableStatus() throws Exception {
	viewResolver.setUseNotAcceptableStatusCode(true);
	request.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9");

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));

	viewResolver.afterPropertiesSet();

	View viewMock = mock(View.class, "application_xml");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn("application/pdf");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertNotNull("Invalid view", result);
	MockHttpServletResponse response = new MockHttpServletResponse();
	result.render(null, request, response);
	assertEquals("Invalid status code set", 406, response.getStatus());
}
 

@PostMapping("profile")
public View addTask(@RequestParam("category") String category, @RequestParam("title") String title,
                    @RequestParam("content") String content, @RequestParam("code") String code,
                    @RequestParam("id_user") String id_user, HttpServletRequest request) {
    Topic topic = new Topic();
    topic.setCategory(category);

    // I know that it can be blank field, but I did it on purpose to find out about Optionals:
    if (Objects.equals(code, ""))
        topic.setCode(null);
    else
        topic.setCode(code);

    topic.setContent(content);
    topic.setTitle(title);
    topic.setCreatedDate(LocalDateTime.now());
    topic.setUser(userRepository.getUserById(Long.parseLong(id_user)));

    topicRepository.save(topic);
    String contextPath = request.getContextPath();
    return new RedirectView(contextPath + "/profile");
}
 

@Test
public void resolveViewNameWithPathExtension() throws Exception {
	request.setRequestURI("/test.xls");

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));
	viewResolver.afterPropertiesSet();

	View viewMock = mock(View.class, "application_xls");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(null);
	given(viewResolverMock.resolveViewName(viewName + ".xls", locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn("application/vnd.ms-excel");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock, result);
}
 

@Test
public void resolveViewNameWithAcceptHeader() throws Exception {
	request.addHeader("Accept", "application/vnd.ms-excel");

	Map<String, MediaType> mapping = Collections.singletonMap("xls", MediaType.valueOf("application/vnd.ms-excel"));
	MappingMediaTypeFileExtensionResolver extensionsResolver = new MappingMediaTypeFileExtensionResolver(mapping);
	ContentNegotiationManager manager = new ContentNegotiationManager(new HeaderContentNegotiationStrategy());
	manager.addFileExtensionResolvers(extensionsResolver);
	viewResolver.setContentNegotiationManager(manager);

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));

	View viewMock = mock(View.class, "application_xls");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(null);
	given(viewResolverMock.resolveViewName(viewName + ".xls", locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn("application/vnd.ms-excel");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock, result);
}
 

@Test
public void resolveArgumentWithExistingPathVars() throws Exception {
	Map<String, String> uriTemplateVars = new HashMap<>();
	uriTemplateVars.put("name", "value");
	request.setAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, uriTemplateVars);

	uriTemplateVars.put("oldName", "oldValue");
	request.setAttribute(View.PATH_VARIABLES, uriTemplateVars);

	String result = (String) resolver.resolveArgument(paramNamedString, mavContainer, webRequest, null);
	assertEquals("PathVariable not resolved correctly", "value", result);

	@SuppressWarnings("unchecked")
	Map<String, Object> pathVars = (Map<String, Object>) request.getAttribute(View.PATH_VARIABLES);
	assertNotNull(pathVars);
	assertEquals(2, pathVars.size());
	assertEquals("value", pathVars.get("name"));
	assertEquals("oldValue", pathVars.get("oldName"));
}
 

@Test
public void resolveViewNameWithRequestParameter() throws Exception {
	request.addParameter("format", "xls");

	Map<String, MediaType> mapping = Collections.singletonMap("xls", MediaType.valueOf("application/vnd.ms-excel"));
	ParameterContentNegotiationStrategy paramStrategy = new ParameterContentNegotiationStrategy(mapping);
	viewResolver.setContentNegotiationManager(new ContentNegotiationManager(paramStrategy));

	ViewResolver viewResolverMock = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Collections.singletonList(viewResolverMock));
	viewResolver.afterPropertiesSet();

	View viewMock = mock(View.class, "application_xls");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock.resolveViewName(viewName, locale)).willReturn(null);
	given(viewResolverMock.resolveViewName(viewName + ".xls", locale)).willReturn(viewMock);
	given(viewMock.getContentType()).willReturn("application/vnd.ms-excel");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock, result);
}
 

@Test
public void resolveViewNameFilename() throws Exception {
	request.setRequestURI("/test.html");

	ViewResolver viewResolverMock1 = mock(ViewResolver.class, "viewResolver1");
	ViewResolver viewResolverMock2 = mock(ViewResolver.class, "viewResolver2");
	viewResolver.setViewResolvers(Arrays.asList(viewResolverMock1, viewResolverMock2));

	viewResolver.afterPropertiesSet();

	View viewMock1 = mock(View.class, "application_xml");
	View viewMock2 = mock(View.class, "text_html");

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock1.resolveViewName(viewName, locale)).willReturn(viewMock1);
	given(viewResolverMock1.resolveViewName(viewName + ".html", locale)).willReturn(null);
	given(viewResolverMock2.resolveViewName(viewName, locale)).willReturn(null);
	given(viewResolverMock2.resolveViewName(viewName + ".html", locale)).willReturn(viewMock2);
	given(viewMock1.getContentType()).willReturn("application/xml");
	given(viewMock2.getContentType()).willReturn("text/html;charset=ISO-8859-1");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock2, result);
}
 

@Override
public View resolveViewName(String viewName, Locale locale) throws Exception {
    if (views.isEmpty()) {
        logger.warn("No views configured for view resolver [{}]", getClass().getName());
    }

    View view = null;

    if (view == null) {
        view = resolveViewWithHrefSuffix(viewName, locale);
    }

    if (view == null) {
        view = resolveViewWithAcceptHeader(viewName, locale);
    }

    return view;
}
 

@Test
public void nestedViewResolverIsNotSpringBean() throws Exception {
	StaticWebApplicationContext webAppContext = new StaticWebApplicationContext();
	webAppContext.setServletContext(new MockServletContext());
	webAppContext.refresh();

	InternalResourceViewResolver nestedResolver = new InternalResourceViewResolver();
	nestedResolver.setApplicationContext(webAppContext);
	nestedResolver.setViewClass(InternalResourceView.class);
	viewResolver.setViewResolvers(new ArrayList<>(Arrays.asList(nestedResolver)));

	FixedContentNegotiationStrategy fixedStrategy = new FixedContentNegotiationStrategy(MediaType.TEXT_HTML);
	viewResolver.setContentNegotiationManager(new ContentNegotiationManager(fixedStrategy));

	viewResolver.afterPropertiesSet();

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	View result = viewResolver.resolveViewName(viewName, locale);
	assertNotNull("Invalid view", result);
}
 

@Override
public View resolveViewName(String viewName, Locale locale) throws Exception {
	RequestAttributes attrs = RequestContextHolder.getRequestAttributes();
	Assert.isInstanceOf(ServletRequestAttributes.class, attrs);
	List<MediaType> requestedMediaTypes = getMediaTypes(((ServletRequestAttributes) attrs).getRequest());
	if (requestedMediaTypes != null) {
		List<View> candidateViews = getCandidateViews(viewName, locale, requestedMediaTypes);
		View bestView = getBestView(candidateViews, requestedMediaTypes, attrs);
		if (bestView != null) {
			return bestView;
		}
	}
	if (this.useNotAcceptableStatusCode) {
		if (logger.isDebugEnabled()) {
			logger.debug("No acceptable view found; returning 406 (Not Acceptable) status code");
		}
		return NOT_ACCEPTABLE_VIEW;
	}
	else {
		logger.debug("No acceptable view found; returning null");
		return null;
	}
}
 

private void doTestUrlBasedViewResolverWithPrefixes(UrlBasedViewResolver vr) throws Exception {
	StaticWebApplicationContext wac = new StaticWebApplicationContext();
	wac.setServletContext(new MockServletContext());
	wac.refresh();
	vr.setPrefix("/WEB-INF/");
	vr.setSuffix(".jsp");
	vr.setApplicationContext(wac);

	View view = vr.resolveViewName("example1", Locale.getDefault());
	assertEquals("Correct view class", JstlView.class, view.getClass());
	assertEquals("Correct URL", "/WEB-INF/example1.jsp", ((InternalResourceView) view).getUrl());

	view = vr.resolveViewName("example2", Locale.getDefault());
	assertEquals("Correct view class", JstlView.class, view.getClass());
	assertEquals("Correct URL", "/WEB-INF/example2.jsp", ((InternalResourceView) view).getUrl());

	view = vr.resolveViewName("redirect:myUrl", Locale.getDefault());
	assertEquals("Correct view class", RedirectView.class, view.getClass());
	assertEquals("Correct URL", "myUrl", ((RedirectView) view).getUrl());

	view = vr.resolveViewName("forward:myUrl", Locale.getDefault());
	assertEquals("Correct view class", InternalResourceView.class, view.getClass());
	assertEquals("Correct URL", "myUrl", ((InternalResourceView) view).getUrl());
}
 

private View getAuthorizationCodeResponse(AuthorizationRequest authorizationRequest, Authentication authUser) {
	try {
		return new RedirectView(getSuccessfulRedirect(authorizationRequest,
				generateCode(authorizationRequest, authUser)), false, true, false);
	}
	catch (OAuth2Exception e) {
		return new RedirectView(getUnsuccessfulRedirect(authorizationRequest, e, false), false, true, false);
	}
}
 

@Test
public void resolveViewNameFilenameDefaultView() throws Exception {
	request.setRequestURI("/test.json");

	Map<String, MediaType> mapping = Collections.singletonMap("json", MediaType.APPLICATION_JSON);
	PathExtensionContentNegotiationStrategy pathStrategy = new PathExtensionContentNegotiationStrategy(mapping);
	viewResolver.setContentNegotiationManager(new ContentNegotiationManager(pathStrategy));

	ViewResolver viewResolverMock1 = mock(ViewResolver.class);
	ViewResolver viewResolverMock2 = mock(ViewResolver.class);
	viewResolver.setViewResolvers(Arrays.asList(viewResolverMock1, viewResolverMock2));

	View viewMock1 = mock(View.class, "application_xml");
	View viewMock2 = mock(View.class, "text_html");
	View viewMock3 = mock(View.class, "application_json");

	List<View> defaultViews = new ArrayList<View>();
	defaultViews.add(viewMock3);
	viewResolver.setDefaultViews(defaultViews);

	viewResolver.afterPropertiesSet();

	String viewName = "view";
	Locale locale = Locale.ENGLISH;

	given(viewResolverMock1.resolveViewName(viewName, locale)).willReturn(viewMock1);
	given(viewResolverMock1.resolveViewName(viewName + ".json", locale)).willReturn(null);
	given(viewResolverMock2.resolveViewName(viewName, locale)).willReturn(viewMock2);
	given(viewResolverMock2.resolveViewName(viewName + ".json", locale)).willReturn(null);
	given(viewMock1.getContentType()).willReturn("application/xml");
	given(viewMock2.getContentType()).willReturn("text/html;charset=ISO-8859-1");
	given(viewMock3.getContentType()).willReturn("application/json");

	View result = viewResolver.resolveViewName(viewName, locale);
	assertSame("Invalid view", viewMock3, result);
}
 

@Test
public void attributeStatusCodeHttp10() throws Exception {
	RedirectView rv = new RedirectView();
	rv.setUrl("http://url.somewhere.com");
	MockHttpServletRequest request = createRequest();
	request.setAttribute(View.RESPONSE_STATUS_ATTRIBUTE, HttpStatus.CREATED);
	MockHttpServletResponse response = new MockHttpServletResponse();
	rv.render(new HashMap<String, Object>(), request, response);
	assertEquals(201, response.getStatus());
	assertEquals("http://url.somewhere.com", response.getHeader("Location"));
}
 

@GetMapping("scheduled")
public View scheduled(Model model, HttpServletResponse response) throws Exception {
  if (!rqueueWebConfig.isEnable()) {
    response.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
    return null;
  }
  addBasicDetails(model);
  addNavData(model, NavTab.SCHEDULED);
  model.addAttribute("title", "Scheduled Tasks");
  List<List<Object>> l = rqueueQDetailService.getScheduledTasks();
  model.addAttribute("tasks", l.subList(1, l.size()));
  model.addAttribute("header", l.get(0));
  return rqueueViewResolver.resolveViewName("running", Locale.ENGLISH);
}
 

/**
 * Return a ModelAndView object with the specified view name.
 * <p>The content of the {@link RequestContextUtils#getInputFlashMap
 * "input" FlashMap} is also added to the model.
 * @see #getViewName()
 */
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
		throws Exception {

	String viewName = getViewName();

	if (getStatusCode() != null) {
		if (getStatusCode().is3xxRedirection()) {
			request.setAttribute(View.RESPONSE_STATUS_ATTRIBUTE, getStatusCode());
		}
		else {
			response.setStatus(getStatusCode().value());
			if (getStatusCode().equals(HttpStatus.NO_CONTENT) && viewName == null) {
				return null;
			}
		}
	}

	if (isStatusOnly()) {
		return null;
	}

	ModelAndView modelAndView = new ModelAndView();
	modelAndView.addAllObjects(RequestContextUtils.getInputFlashMap(request));
	if (viewName != null) {
		modelAndView.setViewName(viewName);
	}
	else {
		modelAndView.setView(getView());
	}
	return modelAndView;
}
 

@Override
@Nullable
public View resolveViewName(String viewName, Locale locale) throws Exception {
	if (!isCache()) {
		return createView(viewName, locale);
	}
	else {
		Object cacheKey = getCacheKey(viewName, locale);
		View view = this.viewAccessCache.get(cacheKey);
		if (view == null) {
			synchronized (this.viewCreationCache) {
				view = this.viewCreationCache.get(cacheKey);
				if (view == null) {
					// Ask the subclass to create the View object.
					view = createView(viewName, locale);
					if (view == null && this.cacheUnresolved) {
						view = UNRESOLVED_VIEW;
					}
					if (view != null) {
						this.viewAccessCache.put(cacheKey, view);
						this.viewCreationCache.put(cacheKey, view);
					}
				}
			}
		}
		else {
			if (logger.isTraceEnabled()) {
				logger.trace(formatKey(cacheKey) + "served from cache");
			}
		}
		return (view != UNRESOLVED_VIEW ? view : null);
	}
}
 

protected View resolveViewName(String viewName, Map<String, Object> model, Locale locale,
		HttpServletRequest request) throws Exception {

	for (ViewResolver viewResolver : this.viewResolvers) {
		View view = viewResolver.resolveViewName(viewName, locale);
		if (view != null) {
			return view;
		}
	}
	return null;
}
 

/**
 * Determines the status code to use for HTTP 1.1 compatible requests.
 * <p>The default implementation returns the {@link #setStatusCode(HttpStatus) statusCode}
 * property if set, or the value of the {@link #RESPONSE_STATUS_ATTRIBUTE} attribute.
 * If neither are set, it defaults to {@link HttpStatus#SEE_OTHER} (303).
 * @param request the request to inspect
 * @param response the servlet response
 * @param targetUrl the target URL
 * @return the response status
 */
protected HttpStatus getHttp11StatusCode(
		HttpServletRequest request, HttpServletResponse response, String targetUrl) {

	if (this.statusCode != null) {
		return this.statusCode;
	}
	HttpStatus attributeStatusCode = (HttpStatus) request.getAttribute(View.RESPONSE_STATUS_ATTRIBUTE);
	if (attributeStatusCode != null) {
		return attributeStatusCode;
	}
	return HttpStatus.SEE_OTHER;
}
 

@Override
@Nullable
public View resolveViewName(String viewName, Locale locale) throws Exception {
	RequestAttributes attrs = RequestContextHolder.getRequestAttributes();
	Assert.state(attrs instanceof ServletRequestAttributes, "No current ServletRequestAttributes");
	List<MediaType> requestedMediaTypes = getMediaTypes(((ServletRequestAttributes) attrs).getRequest());
	if (requestedMediaTypes != null) {
		List<View> candidateViews = getCandidateViews(viewName, locale, requestedMediaTypes);
		View bestView = getBestView(candidateViews, requestedMediaTypes, attrs);
		if (bestView != null) {
			return bestView;
		}
	}

	String mediaTypeInfo = logger.isDebugEnabled() && requestedMediaTypes != null ?
			" given " + requestedMediaTypes.toString() : "";

	if (this.useNotAcceptableStatusCode) {
		if (logger.isDebugEnabled()) {
			logger.debug("Using 406 NOT_ACCEPTABLE" + mediaTypeInfo);
		}
		return NOT_ACCEPTABLE_VIEW;
	}
	else {
		logger.debug("View remains unresolved" + mediaTypeInfo);
		return null;
	}
}
 

@Test
public void testIsWriteableEnum() throws Exception {
    String viewName = "/test";
    View view = expectGetView(viewName);
    viewResolver.setClassResources(Collections.singletonMap(TestEnum.class.getName() + "."
            + TestEnum.ONE, viewName));
    replayAll();
    assertTrue(viewResolver.isWriteable(TestEnum.ONE.getClass(), null, null, null));
    assertEquals(view, viewResolver.getView(TestEnum.ONE.getClass(), TestEnum.ONE));
}