001/* 002 * Copyright 2002-2017 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 javax.servlet.http.HttpServletRequest; 020 021import org.springframework.core.MethodParameter; 022import org.springframework.lang.Nullable; 023import org.springframework.util.Assert; 024import org.springframework.web.bind.support.WebDataBinderFactory; 025import org.springframework.web.context.request.NativeWebRequest; 026import org.springframework.web.method.support.HandlerMethodArgumentResolver; 027import org.springframework.web.method.support.ModelAndViewContainer; 028import org.springframework.web.servlet.support.ServletUriComponentsBuilder; 029import org.springframework.web.util.UriComponentsBuilder; 030 031 032/** 033 * Resolvers argument values of type {@link UriComponentsBuilder}. 034 * 035 * <p>The returned instance is initialized via 036 * {@link ServletUriComponentsBuilder#fromServletMapping(HttpServletRequest)}. 037 * 038 * @author Rossen Stoyanchev 039 * @since 3.1 040 */ 041public class UriComponentsBuilderMethodArgumentResolver implements HandlerMethodArgumentResolver { 042 043 @Override 044 public boolean supportsParameter(MethodParameter parameter) { 045 Class<?> type = parameter.getParameterType(); 046 return (UriComponentsBuilder.class == type || ServletUriComponentsBuilder.class == type); 047 } 048 049 @Override 050 public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer, 051 NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception { 052 053 HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class); 054 Assert.state(request != null, "No HttpServletRequest"); 055 return ServletUriComponentsBuilder.fromServletMapping(request); 056 } 057 058}