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.reactive.config; 018 019import java.util.ArrayList; 020import java.util.List; 021import java.util.Objects; 022import java.util.function.Function; 023import java.util.stream.Collectors; 024 025import org.springframework.format.FormatterRegistry; 026import org.springframework.http.codec.ServerCodecConfigurer; 027import org.springframework.lang.Nullable; 028import org.springframework.util.CollectionUtils; 029import org.springframework.validation.MessageCodesResolver; 030import org.springframework.validation.Validator; 031import org.springframework.web.reactive.accept.RequestedContentTypeResolverBuilder; 032import org.springframework.web.reactive.result.method.annotation.ArgumentResolverConfigurer; 033 034/** 035 * A {@link WebFluxConfigurer} that delegates to one or more others. 036 * 037 * @author Brian Clozel 038 * @author Rossen Stoyanchev 039 * @since 5.0 040 */ 041public class WebFluxConfigurerComposite implements WebFluxConfigurer { 042 043 private final List<WebFluxConfigurer> delegates = new ArrayList<>(); 044 045 046 public void addWebFluxConfigurers(List<WebFluxConfigurer> configurers) { 047 if (!CollectionUtils.isEmpty(configurers)) { 048 this.delegates.addAll(configurers); 049 } 050 } 051 052 053 @Override 054 public void configureContentTypeResolver(RequestedContentTypeResolverBuilder builder) { 055 this.delegates.forEach(delegate -> delegate.configureContentTypeResolver(builder)); 056 } 057 058 @Override 059 public void addCorsMappings(CorsRegistry registry) { 060 this.delegates.forEach(delegate -> delegate.addCorsMappings(registry)); 061 } 062 063 @Override 064 public void configurePathMatching(PathMatchConfigurer configurer) { 065 this.delegates.forEach(delegate -> delegate.configurePathMatching(configurer)); 066 } 067 068 @Override 069 public void addResourceHandlers(ResourceHandlerRegistry registry) { 070 this.delegates.forEach(delegate -> delegate.addResourceHandlers(registry)); 071 } 072 073 @Override 074 public void configureArgumentResolvers(ArgumentResolverConfigurer configurer) { 075 this.delegates.forEach(delegate -> delegate.configureArgumentResolvers(configurer)); 076 } 077 078 @Override 079 public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) { 080 this.delegates.forEach(delegate -> delegate.configureHttpMessageCodecs(configurer)); 081 } 082 083 @Override 084 public void addFormatters(FormatterRegistry registry) { 085 this.delegates.forEach(delegate -> delegate.addFormatters(registry)); 086 } 087 088 @Override 089 public Validator getValidator() { 090 return createSingleBean(WebFluxConfigurer::getValidator, Validator.class); 091 } 092 093 @Override 094 public MessageCodesResolver getMessageCodesResolver() { 095 return createSingleBean(WebFluxConfigurer::getMessageCodesResolver, MessageCodesResolver.class); 096 } 097 098 @Override 099 public void configureViewResolvers(ViewResolverRegistry registry) { 100 this.delegates.forEach(delegate -> delegate.configureViewResolvers(registry)); 101 } 102 103 @Nullable 104 private <T> T createSingleBean(Function<WebFluxConfigurer, T> factory, Class<T> beanType) { 105 List<T> result = this.delegates.stream().map(factory).filter(Objects::nonNull).collect(Collectors.toList()); 106 if (result.isEmpty()) { 107 return null; 108 } 109 else if (result.size() == 1) { 110 return result.get(0); 111 } 112 else { 113 throw new IllegalStateException("More than one WebFluxConfigurer implements " + 114 beanType.getSimpleName() + " factory method."); 115 } 116 } 117 118}