/*
* Copyright 2002-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.servlet.config.annotation;
import java.util.ArrayList;
import java.util.List;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.HandlerExceptionResolver;
/**
* An {@link WebMvcConfigurer} implementation that delegates to other {@link WebMvcConfigurer} instances.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
class WebMvcConfigurerComposite implements WebMvcConfigurer {
private final List<WebMvcConfigurer> delegates = new ArrayList<WebMvcConfigurer>();
public void addWebMvcConfigurers(List<WebMvcConfigurer> configurers) {
if (configurers != null) {
this.delegates.addAll(configurers);
}
}
public void addFormatters(FormatterRegistry registry) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.addFormatters(registry);
}
}
public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.configureContentNegotiation(configurer);
}
}
public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.configureAsyncSupport(configurer);
}
}
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.configureMessageConverters(converters);
}
}
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.addArgumentResolvers(argumentResolvers);
}
}
public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.addReturnValueHandlers(returnValueHandlers);
}
}
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.configureHandlerExceptionResolvers(exceptionResolvers);
}
}
public void addInterceptors(InterceptorRegistry registry) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.addInterceptors(registry);
}
}
public void addViewControllers(ViewControllerRegistry registry) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.addViewControllers(registry);
}
}
public void addResourceHandlers(ResourceHandlerRegistry registry) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.addResourceHandlers(registry);
}
}
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
for (WebMvcConfigurer delegate : this.delegates) {
delegate.configureDefaultServletHandling(configurer);
}
}
public Validator getValidator() {
List<Validator> candidates = new ArrayList<Validator>();
for (WebMvcConfigurer configurer : this.delegates) {
Validator validator = configurer.getValidator();
if (validator != null) {
candidates.add(validator);
}
}
return selectSingleInstance(candidates, Validator.class);
}
private <T> T selectSingleInstance(List<T> instances, Class<T> instanceType) {
if (instances.size() > 1) {
throw new IllegalStateException(
"Only one [" + instanceType + "] was expected but multiple instances were provided: " + instances);
}
else if (instances.size() == 1) {
return instances.get(0);
}
else {
return null;
}
}
public MessageCodesResolver getMessageCodesResolver() {
List<MessageCodesResolver> candidates = new ArrayList<MessageCodesResolver>();
for (WebMvcConfigurer configurer : this.delegates) {
MessageCodesResolver messageCodesResolver = configurer.getMessageCodesResolver();
if (messageCodesResolver != null) {
candidates.add(messageCodesResolver);
}
}
return selectSingleInstance(candidates, MessageCodesResolver.class);
}
}