spring ModelMethodArgumentResolver 源码
spring ModelMethodArgumentResolver 代码
文件路径：/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ModelMethodArgumentResolver.java
/*
* Copyright 2002-2019 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.ui.Model;
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;
/**
* Resolver for a controller method argument of type {@link Model} that can
* also be resolved as a {@link java.util.Map}.
*
* <p>A Map return value can be interpreted in more than one way depending
* on the presence of annotations like {@code @ModelAttribute} or
* {@code @ResponseBody}. As of 5.2 this resolver returns false if a
* parameter of type {@code Map} is also annotated.
*
* @author Rossen Stoyanchev
* @since 5.2
*/
public class ModelMethodArgumentResolver extends HandlerMethodArgumentResolverSupport
implements SyncHandlerMethodArgumentResolver {
public ModelMethodArgumentResolver(ReactiveAdapterRegistry adapterRegistry) {
super(adapterRegistry);
}
@Override
public boolean supportsParameter(MethodParameter param) {
return checkParameterTypeNoReactiveWrapper(param, type ->
Model.class.isAssignableFrom(type) ||
(Map.class.isAssignableFrom(type) && param.getParameterAnnotations().length == 0));
}
@Override
public Object resolveArgumentValue(
MethodParameter parameter, BindingContext context, ServerWebExchange exchange) {
Class<?> type = parameter.getParameterType();
if (Model.class.isAssignableFrom(type)) {
return context.getModel();
}
else if (Map.class.isAssignableFrom(type)) {
return context.getModel().asMap();
}
else {
// Should never happen..
throw new IllegalStateException("Unexpected method parameter type: " + type);
}
}
}
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