com.iflytek.edu.cloud.frame.spring.RequestMappingHandlerAdapterFactoryBean.java Source code

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/**
 * Copyright 2013-2014 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 com.iflytek.edu.cloud.frame.spring;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.format.support.FormattingConversionServiceFactoryBean;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean;
import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
import org.springframework.web.method.annotation.ModelAttributeMethodProcessor;
import org.springframework.web.method.annotation.RequestParamMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.mvc.method.annotation.AsyncTaskMethodReturnValueHandler;
import org.springframework.web.servlet.mvc.method.annotation.CallableMethodReturnValueHandler;
import org.springframework.web.servlet.mvc.method.annotation.DeferredResultMethodReturnValueHandler;
import org.springframework.web.servlet.mvc.method.annotation.HttpHeadersReturnValueHandler;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor;
import org.springframework.web.servlet.mvc.method.annotation.ServletRequestMethodArgumentResolver;
import org.springframework.web.servlet.mvc.method.annotation.ServletResponseMethodArgumentResolver;

/**
 * RequestMappingHandlerAdapter??? 
 * 
 * @author libinsong1204@gmail.com
 *
 */
public class RequestMappingHandlerAdapterFactoryBean
        implements FactoryBean<RequestMappingHandlerAdapter>, InitializingBean, ApplicationContextAware {
    private RequestMappingHandlerAdapter handlerAdapter;

    private List<HttpMessageConverter<?>> messageConverters;

    private ApplicationContext applicationContext;

    @Override
    public void afterPropertiesSet() throws Exception {
        handlerAdapter = new RequestMappingHandlerAdapter();
        handlerAdapter.setArgumentResolvers(getDefaultArgumentResolvers());
        handlerAdapter.setInitBinderArgumentResolvers(getDefaultInitBinderArgumentResolvers());
        handlerAdapter.setReturnValueHandlers(getDefaultReturnValueHandlers());

        ConfigurableWebBindingInitializer webBindingInitializer = new ConfigurableWebBindingInitializer();
        FormattingConversionServiceFactoryBean conversionServiceFactoryBean = new FormattingConversionServiceFactoryBean();
        conversionServiceFactoryBean.afterPropertiesSet();
        webBindingInitializer.setConversionService(conversionServiceFactoryBean.getObject());

        OptionalValidatorFactoryBean validatorFactoryBean = new OptionalValidatorFactoryBean();
        validatorFactoryBean.afterPropertiesSet();
        webBindingInitializer.setValidator(validatorFactoryBean);

        handlerAdapter.setWebBindingInitializer(webBindingInitializer);
        handlerAdapter.setApplicationContext(applicationContext);
        handlerAdapter.afterPropertiesSet();
    }

    @Override
    public RequestMappingHandlerAdapter getObject() throws Exception {
        return handlerAdapter;
    }

    @Override
    public Class<RequestMappingHandlerAdapter> getObjectType() {
        return RequestMappingHandlerAdapter.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

    private List<HandlerMethodArgumentResolver> getDefaultArgumentResolvers() {
        List<HandlerMethodArgumentResolver> resolvers = new ArrayList<HandlerMethodArgumentResolver>();

        // Type-based argument resolution
        resolvers.add(new ServletRequestMethodArgumentResolver());

        // Catch-all
        resolvers.add(new RequestParamMethodArgumentResolver(null, true));
        resolvers.add(new ServletResponseMethodArgumentResolver());
        resolvers.add(new ServletModelAttributeMethodProcessor(true));

        return resolvers;
    }

    private List<HandlerMethodArgumentResolver> getDefaultInitBinderArgumentResolvers() {
        List<HandlerMethodArgumentResolver> resolvers = new ArrayList<HandlerMethodArgumentResolver>();
        return resolvers;
    }

    private List<HandlerMethodReturnValueHandler> getDefaultReturnValueHandlers() {
        List<HandlerMethodReturnValueHandler> handlers = new ArrayList<HandlerMethodReturnValueHandler>();

        handlers.add(new HttpHeadersReturnValueHandler());
        handlers.add(new CallableMethodReturnValueHandler());
        handlers.add(new DeferredResultMethodReturnValueHandler());
        handlers.add(new AsyncTaskMethodReturnValueHandler(null));

        // Annotation-based return value types
        handlers.add(new ModelAttributeMethodProcessor(false));
        handlers.add(new RequestResponseBodyMethodProcessorExt(getMessageConverters()));

        return handlers;
    }

    public List<HttpMessageConverter<?>> getMessageConverters() {
        return messageConverters;
    }

    public void setMessageConverters(List<HttpMessageConverter<?>> messageConverters) {
        this.messageConverters = messageConverters;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

}