spring RequestHeaderMapMethodArgumentResolver 源码
spring RequestHeaderMapMethodArgumentResolver 代码
文件路径：/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/RequestHeaderMapMethodArgumentResolver.java
/*
* Copyright 2002-2018 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.reactive.result.method.annotation;
import java.util.Map;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.http.HttpHeaders;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport;
import org.springframework.web.reactive.result.method.SyncHandlerMethodArgumentResolver;
import org.springframework.web.server.ServerWebExchange;
/**
* Resolves {@link Map} method arguments annotated with {@code @RequestHeader}.
* For individual header values annotated with {@code @RequestHeader} see
* {@link RequestHeaderMethodArgumentResolver} instead.
*
* <p>The created {@link Map} contains all request header name/value pairs.
* The method parameter type may be a {@link MultiValueMap} to receive all
* values for a header, not only the first one.
*
* @author Rossen Stoyanchev
* @since 5.0
* @see RequestHeaderMethodArgumentResolver
*/
public class RequestHeaderMapMethodArgumentResolver extends HandlerMethodArgumentResolverSupport
implements SyncHandlerMethodArgumentResolver {
public RequestHeaderMapMethodArgumentResolver(ReactiveAdapterRegistry adapterRegistry) {
super(adapterRegistry);
}
@Override
public boolean supportsParameter(MethodParameter param) {
return checkAnnotatedParamNoReactiveWrapper(param, RequestHeader.class, this::allParams);
}
private boolean allParams(RequestHeader annotation, Class<?> type) {
return Map.class.isAssignableFrom(type);
}
@Override
public Object resolveArgumentValue(
MethodParameter methodParameter, BindingContext context, ServerWebExchange exchange) {
boolean isMultiValueMap = MultiValueMap.class.isAssignableFrom(methodParameter.getParameterType());
HttpHeaders headers = exchange.getRequest().getHeaders();
return (isMultiValueMap ? headers : headers.toSingleValueMap());
}
}
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