001/* 002 * Copyright 2002-2012 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.servlet.mvc.method.annotation; 018 019import org.springframework.web.bind.support.WebArgumentResolver; 020import org.springframework.web.context.request.NativeWebRequest; 021import org.springframework.web.context.request.RequestAttributes; 022import org.springframework.web.context.request.RequestContextHolder; 023import org.springframework.web.context.request.ServletRequestAttributes; 024import org.springframework.web.context.request.ServletWebRequest; 025import org.springframework.web.method.annotation.AbstractWebArgumentResolverAdapter; 026 027/** 028 * A Servlet-specific {@link org.springframework.web.method.annotation.AbstractWebArgumentResolverAdapter} that creates a 029 * {@link NativeWebRequest} from {@link ServletRequestAttributes}. 030 * 031 * <p><strong>Note:</strong> This class is provided for backwards compatibility. 032 * However it is recommended to re-write a {@code WebArgumentResolver} as 033 * {@code HandlerMethodArgumentResolver}. For more details see javadoc of 034 * {@link org.springframework.web.method.annotation.AbstractWebArgumentResolverAdapter}. 035 * 036 * @author Rossen Stoyanchev 037 * @since 3.1 038 */ 039public class ServletWebArgumentResolverAdapter extends AbstractWebArgumentResolverAdapter { 040 041 public ServletWebArgumentResolverAdapter(WebArgumentResolver adaptee) { 042 super(adaptee); 043 } 044 045 @Override 046 protected NativeWebRequest getWebRequest() { 047 RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes(); 048 if (requestAttributes instanceof ServletRequestAttributes) { 049 ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes; 050 return new ServletWebRequest(servletRequestAttributes.getRequest()); 051 } 052 return null; 053 } 054}