/**
 * Return a handler mapping ordered at 1 to map URL paths directly to
 * view names. To configure view controllers, override
 * {@link #addViewControllers}.
 */
@Bean
@Nullable
public HandlerMapping viewControllerHandlerMapping(PathMatcher mvcPathMatcher,
		UrlPathHelper mvcUrlPathHelper,
		FormattingConversionService mvcConversionService,
		ResourceUrlProvider mvcResourceUrlProvider) {
	ViewControllerRegistry registry = new ViewControllerRegistry(this.applicationContext);
	addViewControllers(registry);

	AbstractHandlerMapping handlerMapping = registry.buildHandlerMapping();
	if (handlerMapping == null) {
		return null;
	}
	handlerMapping.setPathMatcher(mvcPathMatcher);
	handlerMapping.setUrlPathHelper(mvcUrlPathHelper);
	handlerMapping.setInterceptors(getInterceptors(mvcConversionService, mvcResourceUrlProvider));
	handlerMapping.setCorsConfigurations(getCorsConfigurations());
	return handlerMapping;
}
 

/**
 * Return a handler mapping ordered at Integer.MAX_VALUE-1 with mapped
 * resource handlers. To configure resource handling, override
 * {@link #addResourceHandlers}.
 */
@Bean
@Nullable
public HandlerMapping resourceHandlerMapping(UrlPathHelper mvcUrlPathHelper,
		PathMatcher mvcPathMatcher,
		ContentNegotiationManager mvcContentNegotiationManager,
		FormattingConversionService mvcConversionService,
		ResourceUrlProvider mvcResourceUrlProvider) {
	Assert.state(this.applicationContext != null, "No ApplicationContext set");
	Assert.state(this.servletContext != null, "No ServletContext set");

	ResourceHandlerRegistry registry = new ResourceHandlerRegistry(this.applicationContext,
			this.servletContext, mvcContentNegotiationManager, mvcUrlPathHelper);
	addResourceHandlers(registry);

	AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
	if (handlerMapping == null) {
		return null;
	}
	handlerMapping.setPathMatcher(mvcPathMatcher);
	handlerMapping.setUrlPathHelper(mvcUrlPathHelper);
	handlerMapping.setInterceptors(getInterceptors(mvcConversionService, mvcResourceUrlProvider));
	handlerMapping.setCorsConfigurations(getCorsConfigurations());
	return handlerMapping;
}
 

@Test
public void testCorsMinimal() throws Exception {
	loadBeanDefinitions("mvc-config-cors-minimal.xml");

	String[] beanNames = appContext.getBeanNamesForType(AbstractHandlerMapping.class);
	assertEquals(2, beanNames.length);
	for (String beanName : beanNames) {
		AbstractHandlerMapping handlerMapping = (AbstractHandlerMapping)appContext.getBean(beanName);
		assertNotNull(handlerMapping);
		DirectFieldAccessor accessor = new DirectFieldAccessor(handlerMapping);
		Map<String, CorsConfiguration> configs = ((UrlBasedCorsConfigurationSource) accessor
				.getPropertyValue("corsConfigurationSource")).getCorsConfigurations();
		assertNotNull(configs);
		assertEquals(1, configs.size());
		CorsConfiguration config = configs.get("/**");
		assertNotNull(config);
		assertArrayEquals(new String[]{"*"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "HEAD", "POST"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"*"}, config.getAllowedHeaders().toArray());
		assertNull(config.getExposedHeaders());
		assertNull(config.getAllowCredentials());
		assertEquals(Long.valueOf(1800), config.getMaxAge());
	}
}
 

public AbstractHandlerMapping getHandlerMapping() {
	Map<String, Object> urlMap = new LinkedHashMap<>();
	for (ServletWebSocketHandlerRegistration registration : this.registrations) {
		MultiValueMap<HttpRequestHandler, String> mappings = registration.getMappings();
		mappings.forEach((httpHandler, patterns) -> {
			for (String pattern : patterns) {
				urlMap.put(pattern, httpHandler);
			}
		});
	}
	WebSocketHandlerMapping hm = new WebSocketHandlerMapping();
	hm.setUrlMap(urlMap);
	hm.setOrder(this.order);
	if (this.urlPathHelper != null) {
		hm.setUrlPathHelper(this.urlPathHelper);
	}
	return hm;
}
 

/**
 * Return a handler mapping with the mapped ViewControllers.
 */
public AbstractHandlerMapping getHandlerMapping() {
	Map<String, Object> urlMap = new LinkedHashMap<>();
	for (WebMvcStompWebSocketEndpointRegistration registration : this.registrations) {
		MultiValueMap<HttpRequestHandler, String> mappings = registration.getMappings();
		mappings.forEach((httpHandler, patterns) -> {
			for (String pattern : patterns) {
				urlMap.put(pattern, httpHandler);
			}
		});
	}
	WebSocketHandlerMapping hm = new WebSocketHandlerMapping();
	hm.setUrlMap(urlMap);
	hm.setOrder(this.order);
	if (this.urlPathHelper != null) {
		hm.setUrlPathHelper(this.urlPathHelper);
	}
	return hm;
}
 

/**
 * 动态删除拦截器
 * @param interceptor       HandlerInterceptor
 * @param handlerMapping    AbstractHandlerMapping实现类
 */
@SuppressWarnings("all")
public static void removeDynamicInterceptor(HandlerInterceptor interceptor, AbstractHandlerMapping handlerMapping) {
    if (interceptor == null) return;
    try {
        findAdaptedInterceptorsField(handlerMapping);
        List<HandlerInterceptor> handlerInterceptors = (List<HandlerInterceptor>) adaptedInterceptorsField.get(handlerMapping);
        List<HandlerInterceptor> shouldRemoveInterceptors = handlerInterceptors.stream().filter(itor -> {
            // 只判断映射的拦截器类型
            if (itor instanceof HydrogenMappedInterceptor) {
                return itor.equals(interceptor);
            }
            return false;
        }).collect(Collectors.toList());
        handlerInterceptors.removeAll(shouldRemoveInterceptors);
        adaptedInterceptorsField.set(handlerMapping, handlerInterceptors);
    } catch (Exception e) {
        log.error("SpringMvcPolyfill invoke AbstractHandlerMapping.adaptedInterceptors error with msg: {}",  e.getMessage(), e);
    }
}
 

/**
 * 查找adaptedInterceptors
 * @param handlerMapping        AbstractHandlerMapping实现类
 * @throws NoSuchFieldException 反射字段异常
 */
private static void findAdaptedInterceptorsField(AbstractHandlerMapping handlerMapping) throws NoSuchFieldException {
    if (adaptedInterceptorsField == null) {
        // 虽然用了反射，但这些代码在只在启动时加载
        // 查找继承链
        // RequestMappingHandlerMapping -> RequestMappingInfoHandlerMapping -> AbstractHandlerMethodMapping -> AbstractHandlerMapping
        // WelcomePageHandlerMapping -> AbstractUrlHandlerMapping -> AbstractHandlerMapping
        Class<?> abstractHandlerMapping = handlerMapping.getClass();
        while (abstractHandlerMapping != AbstractHandlerMapping.class) {
            abstractHandlerMapping = abstractHandlerMapping.getSuperclass();
        }
        // TODO <mark> 由于使用底层API, 这个AbstractHandlerMapping.adaptedInterceptors很后的版本可能会改
        adaptedInterceptorsField = abstractHandlerMapping.getDeclaredField("adaptedInterceptors");
        adaptedInterceptorsField.setAccessible(true);
    }
}
 

/**
 * Return a handler mapping ordered at 1 to map URL paths directly to
 * view names. To configure view controllers, override
 * {@link #addViewControllers}.
 */
@Bean
@Nullable
public HandlerMapping viewControllerHandlerMapping() {
	ViewControllerRegistry registry = new ViewControllerRegistry(this.applicationContext);
	addViewControllers(registry);

	AbstractHandlerMapping handlerMapping = registry.buildHandlerMapping();
	if (handlerMapping == null) {
		return null;
	}
	handlerMapping.setPathMatcher(mvcPathMatcher());
	handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
	handlerMapping.setInterceptors(getInterceptors());
	handlerMapping.setCorsConfigurations(getCorsConfigurations());
	return handlerMapping;
}
 

/**
 * Return a handler mapping ordered at Integer.MAX_VALUE-1 with mapped
 * resource handlers. To configure resource handling, override
 * {@link #addResourceHandlers}.
 */
@Bean
@Nullable
public HandlerMapping resourceHandlerMapping() {
	Assert.state(this.applicationContext != null, "No ApplicationContext set");
	Assert.state(this.servletContext != null, "No ServletContext set");

	ResourceHandlerRegistry registry = new ResourceHandlerRegistry(this.applicationContext,
			this.servletContext, mvcContentNegotiationManager(), mvcUrlPathHelper());
	addResourceHandlers(registry);

	AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
	if (handlerMapping == null) {
		return null;
	}
	handlerMapping.setPathMatcher(mvcPathMatcher());
	handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
	handlerMapping.setInterceptors(getInterceptors());
	handlerMapping.setCorsConfigurations(getCorsConfigurations());
	return handlerMapping;
}
 

@Test
public void testCorsMinimal() throws Exception {
	loadBeanDefinitions("mvc-config-cors-minimal.xml");

	String[] beanNames = appContext.getBeanNamesForType(AbstractHandlerMapping.class);
	assertEquals(2, beanNames.length);
	for (String beanName : beanNames) {
		AbstractHandlerMapping handlerMapping = (AbstractHandlerMapping)appContext.getBean(beanName);
		assertNotNull(handlerMapping);
		DirectFieldAccessor accessor = new DirectFieldAccessor(handlerMapping);
		Map<String, CorsConfiguration> configs = ((UrlBasedCorsConfigurationSource)accessor
				.getPropertyValue("corsConfigurationSource")).getCorsConfigurations();
		assertNotNull(configs);
		assertEquals(1, configs.size());
		CorsConfiguration config = configs.get("/**");
		assertNotNull(config);
		assertArrayEquals(new String[]{"*"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "HEAD", "POST"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"*"}, config.getAllowedHeaders().toArray());
		assertNull(config.getExposedHeaders());
		assertNull(config.getAllowCredentials());
		assertEquals(Long.valueOf(1800), config.getMaxAge());
	}
}
 

public AbstractHandlerMapping getHandlerMapping() {
	Map<String, Object> urlMap = new LinkedHashMap<>();
	for (ServletWebSocketHandlerRegistration registration : this.registrations) {
		MultiValueMap<HttpRequestHandler, String> mappings = registration.getMappings();
		mappings.forEach((httpHandler, patterns) -> {
			for (String pattern : patterns) {
				urlMap.put(pattern, httpHandler);
			}
		});
	}
	WebSocketHandlerMapping hm = new WebSocketHandlerMapping();
	hm.setUrlMap(urlMap);
	hm.setOrder(this.order);
	if (this.urlPathHelper != null) {
		hm.setUrlPathHelper(this.urlPathHelper);
	}
	return hm;
}
 

/**
 * Return a handler mapping with the mapped ViewControllers.
 */
public AbstractHandlerMapping getHandlerMapping() {
	Map<String, Object> urlMap = new LinkedHashMap<>();
	for (WebMvcStompWebSocketEndpointRegistration registration : this.registrations) {
		MultiValueMap<HttpRequestHandler, String> mappings = registration.getMappings();
		mappings.forEach((httpHandler, patterns) -> {
			for (String pattern : patterns) {
				urlMap.put(pattern, httpHandler);
			}
		});
	}
	WebSocketHandlerMapping hm = new WebSocketHandlerMapping();
	hm.setUrlMap(urlMap);
	hm.setOrder(this.order);
	if (this.urlPathHelper != null) {
		hm.setUrlPathHelper(this.urlPathHelper);
	}
	return hm;
}
 

/**
 * Return a handler mapping ordered at Integer.MAX_VALUE-1 with mapped
 * resource handlers. To configure resource handling, override
 * {@link #addResourceHandlers}.
 */
@Bean
public HandlerMapping resourceHandlerMapping() {
	ResourceHandlerRegistry registry = new ResourceHandlerRegistry(this.applicationContext,
			this.servletContext, mvcContentNegotiationManager());
	addResourceHandlers(registry);

	AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
	if (handlerMapping != null) {
		handlerMapping.setPathMatcher(mvcPathMatcher());
		handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
		handlerMapping.setInterceptors(new ResourceUrlProviderExposingInterceptor(mvcResourceUrlProvider()));
		handlerMapping.setCorsConfigurations(getCorsConfigurations());
	}
	else {
		handlerMapping = new EmptyHandlerMapping();
	}
	return handlerMapping;
}
 

/**
 * Return a handler mapping ordered at Integer.MAX_VALUE-1 with mapped
 * resource handlers. To configure resource handling, override
 * {@link #addResourceHandlers}.
 */
@Bean
public HandlerMapping resourceHandlerMapping() {
	ResourceHandlerRegistry registry = new ResourceHandlerRegistry(this.applicationContext, this.servletContext);
	addResourceHandlers(registry);

	AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
	if (handlerMapping != null) {
		handlerMapping.setPathMatcher(mvcPathMatcher());
		handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
		handlerMapping.setInterceptors(new HandlerInterceptor[] {
				new ResourceUrlProviderExposingInterceptor(mvcResourceUrlProvider())});
		handlerMapping.setCorsConfigurations(getCorsConfigurations());
	}
	else {
		handlerMapping = new EmptyHandlerMapping();
	}
	return handlerMapping;
}
 

@Test
public void testCorsMinimal() throws Exception {
	loadBeanDefinitions("mvc-config-cors-minimal.xml", 14);

	String[] beanNames = appContext.getBeanNamesForType(AbstractHandlerMapping.class);
	assertEquals(2, beanNames.length);
	for (String beanName : beanNames) {
		AbstractHandlerMapping handlerMapping = (AbstractHandlerMapping)appContext.getBean(beanName);
		assertNotNull(handlerMapping);
		Map<String, CorsConfiguration> configs = handlerMapping.getCorsConfigurations();
		assertNotNull(configs);
		assertEquals(1, configs.size());
		CorsConfiguration config = configs.get("/**");
		assertNotNull(config);
		assertArrayEquals(new String[]{"*"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "HEAD", "POST"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"*"}, config.getAllowedHeaders().toArray());
		assertNull(config.getExposedHeaders());
		assertTrue(config.getAllowCredentials());
		assertEquals(new Long(1600), config.getMaxAge());
	}
}
 

/**
 * Return a {@link HandlerMapping} with mapped {@link HttpRequestHandler}s.
 */
public AbstractHandlerMapping getHandlerMapping() {
	Map<String, Object> urlMap = new LinkedHashMap<String, Object>();
	for (ServletWebSocketHandlerRegistration registration : this.registrations) {
		MultiValueMap<HttpRequestHandler, String> mappings = registration.getMappings();
		for (HttpRequestHandler httpHandler : mappings.keySet()) {
			for (String pattern : mappings.get(httpHandler)) {
				urlMap.put(pattern, httpHandler);
			}
		}
	}
	WebSocketHandlerMapping hm = new WebSocketHandlerMapping();
	hm.setUrlMap(urlMap);
	hm.setOrder(this.order);
	if (this.urlPathHelper != null) {
		hm.setUrlPathHelper(this.urlPathHelper);
	}
	return hm;
}
 

/**
 * Return a handler mapping with the mapped ViewControllers; or {@code null}
 * in case of no registrations.
 */
public AbstractHandlerMapping getHandlerMapping() {
	Map<String, Object> urlMap = new LinkedHashMap<String, Object>();
	for (WebMvcStompWebSocketEndpointRegistration registration : this.registrations) {
		MultiValueMap<HttpRequestHandler, String> mappings = registration.getMappings();
		for (HttpRequestHandler httpHandler : mappings.keySet()) {
			for (String pattern : mappings.get(httpHandler)) {
				urlMap.put(pattern, httpHandler);
			}
		}
	}
	WebSocketHandlerMapping hm = new WebSocketHandlerMapping();
	hm.setUrlMap(urlMap);
	hm.setOrder(this.order);
	if (this.urlPathHelper != null) {
		hm.setUrlPathHelper(this.urlPathHelper);
	}
	return hm;
}
 

/**
 * Return a handler mapping with the mapped resource handlers; or {@code null} in case
 * of no registrations.
 */
@Nullable
protected AbstractHandlerMapping getHandlerMapping() {
	if (this.registrations.isEmpty()) {
		return null;
	}

	Map<String, HttpRequestHandler> urlMap = new LinkedHashMap<>();
	for (ResourceHandlerRegistration registration : this.registrations) {
		for (String pathPattern : registration.getPathPatterns()) {
			ResourceHttpRequestHandler handler = registration.getRequestHandler();
			if (this.pathHelper != null) {
				handler.setUrlPathHelper(this.pathHelper);
			}
			if (this.contentNegotiationManager != null) {
				handler.setContentNegotiationManager(this.contentNegotiationManager);
			}
			handler.setServletContext(this.servletContext);
			handler.setApplicationContext(this.applicationContext);
			try {
				handler.afterPropertiesSet();
			}
			catch (Throwable ex) {
				throw new BeanInitializationException("Failed to init ResourceHttpRequestHandler", ex);
			}
			urlMap.put(pathPattern, handler);
		}
	}

	SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
	handlerMapping.setOrder(this.order);
	handlerMapping.setUrlMap(urlMap);
	return handlerMapping;
}
 

@Test
public void testCors() throws Exception {
	loadBeanDefinitions("mvc-config-cors.xml");

	String[] beanNames = appContext.getBeanNamesForType(AbstractHandlerMapping.class);
	assertEquals(2, beanNames.length);
	for (String beanName : beanNames) {
		AbstractHandlerMapping handlerMapping = (AbstractHandlerMapping)appContext.getBean(beanName);
		assertNotNull(handlerMapping);
		DirectFieldAccessor accessor = new DirectFieldAccessor(handlerMapping);
		Map<String, CorsConfiguration> configs = ((UrlBasedCorsConfigurationSource) accessor
				.getPropertyValue("corsConfigurationSource")).getCorsConfigurations();
		assertNotNull(configs);
		assertEquals(2, configs.size());
		CorsConfiguration config = configs.get("/api/**");
		assertNotNull(config);
		assertArrayEquals(new String[]{"https://domain1.com", "https://domain2.com"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "PUT"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"header1", "header2", "header3"}, config.getAllowedHeaders().toArray());
		assertArrayEquals(new String[]{"header1", "header2"}, config.getExposedHeaders().toArray());
		assertFalse(config.getAllowCredentials());
		assertEquals(Long.valueOf(123), config.getMaxAge());
		config = configs.get("/resources/**");
		assertArrayEquals(new String[]{"https://domain1.com"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "HEAD", "POST"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"*"}, config.getAllowedHeaders().toArray());
		assertNull(config.getExposedHeaders());
		assertNull(config.getAllowCredentials());
		assertEquals(Long.valueOf(1800), config.getMaxAge());
	}
}
 

/**
 * 动态添加拦截器
 * @param interceptor       拦截器
 * @param order             排序
 * @param includeURLs       需要拦截的URL
 * @param excludeURLs       排除拦截的URL
 * @param handlerMapping    AbstractHandlerMapping实现类
 */
@SuppressWarnings("all")
public static void addDynamicInterceptor(HandlerInterceptor interceptor, int order, List<String> includeURLs, List<String> excludeURLs, AbstractHandlerMapping handlerMapping) {
    String[] include = StringUtils.toStringArray(includeURLs);
    String[] exclude = StringUtils.toStringArray(excludeURLs);
    // HandlerInterceptor -> MappedInterceptor -> HydrogenMappedInterceptor
    HydrogenMappedInterceptor hmi = new HydrogenMappedInterceptor(new MappedInterceptor(include, exclude, interceptor));
    // 内部的处理流程会设置，然而不是最终采纳的拦截器列表
    // handlerMapping.setInterceptors(mappedInterceptor);
    hmi.setOrder(order);
    try {
        findAdaptedInterceptorsField(handlerMapping);
        // 添加到可采纳的拦截器列表，让拦截器处理器Chain流程获取得到这个拦截器
        List<HandlerInterceptor> handlerInterceptors = (List<HandlerInterceptor>) adaptedInterceptorsField.get(handlerMapping);
        // 过滤添加过的拦截器
        boolean mapped = handlerInterceptors.stream().anyMatch(itor -> {
            // 只判断HydrogenMappedInterceptor拦截器类型
            if (itor instanceof HydrogenMappedInterceptor) {
                return itor.equals(hmi);
            }
            return false;
        });
        if (mapped) {
            return;
        }
        handlerInterceptors.add(hmi);
        // 仿Spring MVC源码对拦截器排序
        handlerInterceptors = handlerInterceptors.stream()
                .sorted(OrderComparator.INSTANCE.withSourceProvider(itor -> {
                    if (itor instanceof HydrogenMappedInterceptor) {
                        return (Ordered) ((HydrogenMappedInterceptor) itor)::getOrder;
                    }
                    return null;
                })).collect(Collectors.toList());
        adaptedInterceptorsField.set(handlerMapping, handlerInterceptors);
    } catch (Exception e) {
        log.error("SpringMvcPolyfill invoke AbstractHandlerMapping.adaptedInterceptors error with msg: {}",  e.getMessage(), e);
    }
}
 

/**
 * Return a handler mapping with the mapped resource handlers; or {@code null} in case
 * of no registrations.
 */
@Nullable
protected AbstractHandlerMapping getHandlerMapping() {
	if (this.registrations.isEmpty()) {
		return null;
	}

	Map<String, HttpRequestHandler> urlMap = new LinkedHashMap<>();
	for (ResourceHandlerRegistration registration : this.registrations) {
		for (String pathPattern : registration.getPathPatterns()) {
			ResourceHttpRequestHandler handler = registration.getRequestHandler();
			if (this.pathHelper != null) {
				handler.setUrlPathHelper(this.pathHelper);
			}
			if (this.contentNegotiationManager != null) {
				handler.setContentNegotiationManager(this.contentNegotiationManager);
			}
			handler.setServletContext(this.servletContext);
			handler.setApplicationContext(this.applicationContext);
			try {
				handler.afterPropertiesSet();
			}
			catch (Throwable ex) {
				throw new BeanInitializationException("Failed to init ResourceHttpRequestHandler", ex);
			}
			urlMap.put(pathPattern, handler);
		}
	}

	SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
	handlerMapping.setOrder(this.order);
	handlerMapping.setUrlMap(urlMap);
	return handlerMapping;
}
 

@Test
public void testCors() throws Exception {
	loadBeanDefinitions("mvc-config-cors.xml");

	String[] beanNames = appContext.getBeanNamesForType(AbstractHandlerMapping.class);
	assertEquals(2, beanNames.length);
	for (String beanName : beanNames) {
		AbstractHandlerMapping handlerMapping = (AbstractHandlerMapping)appContext.getBean(beanName);
		assertNotNull(handlerMapping);
		DirectFieldAccessor accessor = new DirectFieldAccessor(handlerMapping);
		Map<String, CorsConfiguration> configs = ((UrlBasedCorsConfigurationSource)accessor
				.getPropertyValue("corsConfigurationSource")).getCorsConfigurations();
		assertNotNull(configs);
		assertEquals(2, configs.size());
		CorsConfiguration config = configs.get("/api/**");
		assertNotNull(config);
		assertArrayEquals(new String[]{"http://domain1.com", "http://domain2.com"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "PUT"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"header1", "header2", "header3"}, config.getAllowedHeaders().toArray());
		assertArrayEquals(new String[]{"header1", "header2"}, config.getExposedHeaders().toArray());
		assertFalse(config.getAllowCredentials());
		assertEquals(Long.valueOf(123), config.getMaxAge());
		config = configs.get("/resources/**");
		assertArrayEquals(new String[]{"http://domain1.com"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "HEAD", "POST"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"*"}, config.getAllowedHeaders().toArray());
		assertNull(config.getExposedHeaders());
		assertNull(config.getAllowCredentials());
		assertEquals(Long.valueOf(1800), config.getMaxAge());
	}
}
 

/**
 * Return a handler mapping with the mapped resource handlers; or {@code null} in case
 * of no registrations.
 */
protected AbstractHandlerMapping getHandlerMapping() {
	if (this.registrations.isEmpty()) {
		return null;
	}

	Map<String, HttpRequestHandler> urlMap = new LinkedHashMap<String, HttpRequestHandler>();
	for (ResourceHandlerRegistration registration : this.registrations) {
		for (String pathPattern : registration.getPathPatterns()) {
			ResourceHttpRequestHandler handler = registration.getRequestHandler();
			handler.setServletContext(this.servletContext);
			handler.setApplicationContext(this.applicationContext);
			handler.setContentNegotiationManager(this.contentNegotiationManager);
			try {
				handler.afterPropertiesSet();
			}
			catch (Throwable ex) {
				throw new BeanInitializationException("Failed to init ResourceHttpRequestHandler", ex);
			}
			urlMap.put(pathPattern, handler);
		}
	}

	SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
	handlerMapping.setOrder(order);
	handlerMapping.setUrlMap(urlMap);
	return handlerMapping;
}
 

/**
 * Return a handler mapping ordered at 1 to map URL paths directly to
 * view names. To configure view controllers, override
 * {@link #addViewControllers}.
 */
@Bean
public HandlerMapping viewControllerHandlerMapping() {
	ViewControllerRegistry registry = new ViewControllerRegistry(this.applicationContext);
	addViewControllers(registry);

	AbstractHandlerMapping handlerMapping = registry.buildHandlerMapping();
	handlerMapping = (handlerMapping != null ? handlerMapping : new EmptyHandlerMapping());
	handlerMapping.setPathMatcher(mvcPathMatcher());
	handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
	handlerMapping.setInterceptors(getInterceptors());
	handlerMapping.setCorsConfigurations(getCorsConfigurations());
	return handlerMapping;
}
 

/**
 * Return a handler mapping instance ordered at {@link Integer#MAX_VALUE} containing the
 * {@link DefaultServletHttpRequestHandler} instance mapped to {@code "/**"}; or {@code null} if
 * default servlet handling was not been enabled.
 */
protected AbstractHandlerMapping getHandlerMapping() {
	if (handler == null) {
		return null;
	}

	Map<String, HttpRequestHandler> urlMap = new HashMap<String, HttpRequestHandler>();
	urlMap.put("/**", handler);

	SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
	handlerMapping.setOrder(Integer.MAX_VALUE);
	handlerMapping.setUrlMap(urlMap);
	return handlerMapping;
}
 

/**
 * Return a handler mapping with the mapped resource handlers; or {@code null} in case of no registrations.
 */
protected AbstractHandlerMapping getHandlerMapping() {
	if (registrations.isEmpty()) {
		return null;
	}

	Map<String, HttpRequestHandler> urlMap = new LinkedHashMap<String, HttpRequestHandler>();
	for (ResourceHandlerRegistration registration : this.registrations) {
		for (String pathPattern : registration.getPathPatterns()) {
			ResourceHttpRequestHandler handler = registration.getRequestHandler();
			handler.setServletContext(this.servletContext);
			handler.setApplicationContext(this.appContext);
			try {
				handler.afterPropertiesSet();
			}
			catch (Exception e) {
				throw new BeanInitializationException("Failed to init ResourceHttpRequestHandler", e);
			}
			urlMap.put(pathPattern, handler);
		}
	}

	SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
	handlerMapping.setOrder(order);
	handlerMapping.setUrlMap(urlMap);
	return handlerMapping;
}
 

/**
 * Return a handler mapping ordered at 1 to map URL paths directly to
 * view names. To configure view controllers, override
 * {@link #addViewControllers}.
 */
@Bean
public HandlerMapping viewControllerHandlerMapping() {
	ViewControllerRegistry registry = new ViewControllerRegistry();
	registry.setApplicationContext(this.applicationContext);
	addViewControllers(registry);

	AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
	handlerMapping = (handlerMapping != null ? handlerMapping : new EmptyHandlerMapping());
	handlerMapping.setPathMatcher(mvcPathMatcher());
	handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
	handlerMapping.setInterceptors(getInterceptors());
	handlerMapping.setCorsConfigurations(getCorsConfigurations());
	return handlerMapping;
}
 

/**
 * Return a handler mapping ordered at Integer.MAX_VALUE with a mapped
 * default servlet handler. To configure "default" Servlet handling,
 * override {@link #configureDefaultServletHandling}.
 */
@Bean
public HandlerMapping defaultServletHandlerMapping() {
	DefaultServletHandlerConfigurer configurer = new DefaultServletHandlerConfigurer(servletContext);
	configureDefaultServletHandling(configurer);
	AbstractHandlerMapping handlerMapping = configurer.getHandlerMapping();
	handlerMapping = handlerMapping != null ? handlerMapping : new EmptyHandlerMapping();
	return handlerMapping;
}
 

@Test
public void testCors() throws Exception {
	loadBeanDefinitions("mvc-config-cors.xml", 14);

	String[] beanNames = appContext.getBeanNamesForType(AbstractHandlerMapping.class);
	assertEquals(2, beanNames.length);
	for (String beanName : beanNames) {
		AbstractHandlerMapping handlerMapping = (AbstractHandlerMapping)appContext.getBean(beanName);
		assertNotNull(handlerMapping);
		Map<String, CorsConfiguration> configs = handlerMapping.getCorsConfigurations();
		assertNotNull(configs);
		assertEquals(2, configs.size());
		CorsConfiguration config = configs.get("/api/**");
		assertNotNull(config);
		assertArrayEquals(new String[]{"http://domain1.com", "http://domain2.com"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "PUT"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"header1", "header2", "header3"}, config.getAllowedHeaders().toArray());
		assertArrayEquals(new String[]{"header1", "header2"}, config.getExposedHeaders().toArray());
		assertFalse(config.getAllowCredentials());
		assertEquals(new Long(123), config.getMaxAge());
		config = configs.get("/resources/**");
		assertArrayEquals(new String[]{"http://domain1.com"}, config.getAllowedOrigins().toArray());
		assertArrayEquals(new String[]{"GET", "HEAD", "POST"}, config.getAllowedMethods().toArray());
		assertArrayEquals(new String[]{"*"}, config.getAllowedHeaders().toArray());
		assertNull(config.getExposedHeaders());
		assertTrue(config.getAllowCredentials());
		assertEquals(new Long(1600), config.getMaxAge());
	}
}
 

@Test
public void emptyViewControllerHandlerMapping() {
	ApplicationContext context = initContext(WebConfig.class);
	String name = "viewControllerHandlerMapping";
	AbstractHandlerMapping handlerMapping = context.getBean(name, AbstractHandlerMapping.class);

	assertNotNull(handlerMapping);
	assertEquals(Integer.MAX_VALUE, handlerMapping.getOrder());
	assertTrue(handlerMapping.getClass().getName().endsWith("EmptyHandlerMapping"));
}