spring RequestBodyArgumentResolver 源码
spring RequestBodyArgumentResolver 代码
文件路径：/spring-web/src/main/java/org/springframework/web/service/invoker/RequestBodyArgumentResolver.java
/*
* Copyright 2002-2022 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.service.invoker;
import org.reactivestreams.Publisher;
import org.springframework.core.MethodParameter;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.core.ReactiveAdapter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.bind.annotation.RequestBody;
/**
* {@link HttpServiceArgumentResolver} for {@link RequestBody @RequestBody}
* annotated arguments.
*
* @author Rossen Stoyanchev
* @since 6.0
*/
public class RequestBodyArgumentResolver implements HttpServiceArgumentResolver {
private final ReactiveAdapterRegistry reactiveAdapterRegistry;
public RequestBodyArgumentResolver(ReactiveAdapterRegistry reactiveAdapterRegistry) {
Assert.notNull(reactiveAdapterRegistry, "ReactiveAdapterRegistry is required");
this.reactiveAdapterRegistry = reactiveAdapterRegistry;
}
@Override
public boolean resolve(
@Nullable Object argument, MethodParameter parameter, HttpRequestValues.Builder requestValues) {
RequestBody annot = parameter.getParameterAnnotation(RequestBody.class);
if (annot == null) {
return false;
}
if (argument != null) {
ReactiveAdapter reactiveAdapter = this.reactiveAdapterRegistry.getAdapter(parameter.getParameterType());
if (reactiveAdapter != null) {
setBody(argument, parameter, reactiveAdapter, requestValues);
}
else {
requestValues.setBodyValue(argument);
}
}
return true;
}
private <E> void setBody(
Object argument, MethodParameter parameter, ReactiveAdapter reactiveAdapter,
HttpRequestValues.Builder requestValues) {
String message = "Async type for @RequestBody should produce value(s)";
Assert.isTrue(!reactiveAdapter.isNoValue(), message);
parameter = parameter.nested();
Class<?> elementClass = parameter.getNestedParameterType();
Assert.isTrue(elementClass != Void.class, message);
ParameterizedTypeReference<E> typeRef = ParameterizedTypeReference.forType(parameter.getNestedGenericParameterType());
Publisher<E> publisher = reactiveAdapter.toPublisher(argument);
requestValues.setBody(publisher, typeRef);
}
}
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