spring ServletWebArgumentResolverAdapter 源码
spring ServletWebArgumentResolverAdapter 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ServletWebArgumentResolverAdapter.java
/*
* Copyright 2002-2017 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
*
* https://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.mvc.method.annotation;
import org.springframework.util.Assert;
import org.springframework.web.bind.support.WebArgumentResolver;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.method.annotation.AbstractWebArgumentResolverAdapter;
/**
* A Servlet-specific
* {@link org.springframework.web.method.annotation.AbstractWebArgumentResolverAdapter}
* that creates a {@link NativeWebRequest} from {@link ServletRequestAttributes}.
*
* <p><strong>Note:</strong> This class is provided for backwards compatibility.
* However it is recommended to re-write a {@code WebArgumentResolver} as
* {@code HandlerMethodArgumentResolver}. For more details see javadoc of
* {@link org.springframework.web.method.annotation.AbstractWebArgumentResolverAdapter}.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
public class ServletWebArgumentResolverAdapter extends AbstractWebArgumentResolverAdapter {
public ServletWebArgumentResolverAdapter(WebArgumentResolver adaptee) {
super(adaptee);
}
@Override
protected NativeWebRequest getWebRequest() {
RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
Assert.state(requestAttributes instanceof ServletRequestAttributes, "No ServletRequestAttributes");
ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes;
return new ServletWebRequest(servletRequestAttributes.getRequest());
}
}
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