spring SessionAttributeMethodArgumentResolver 源码
spring SessionAttributeMethodArgumentResolver 代码
文件路径：/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/SessionAttributeMethodArgumentResolver.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.reactive.result.method.annotation;
import reactor.core.publisher.Mono;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.util.Assert;
import org.springframework.web.bind.annotation.SessionAttribute;
import org.springframework.web.bind.annotation.ValueConstants;
import org.springframework.web.server.MissingRequestValueException;
import org.springframework.web.server.ServerWebExchange;
/**
* Resolves method arguments annotated with an @{@link SessionAttribute}.
*
* @author Rossen Stoyanchev
* @since 5.0
* @see RequestAttributeMethodArgumentResolver
*/
public class SessionAttributeMethodArgumentResolver extends AbstractNamedValueArgumentResolver {
public SessionAttributeMethodArgumentResolver(ConfigurableBeanFactory factory, ReactiveAdapterRegistry registry) {
super(factory, registry);
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
return parameter.hasParameterAnnotation(SessionAttribute.class);
}
@Override
protected NamedValueInfo createNamedValueInfo(MethodParameter parameter) {
SessionAttribute ann = parameter.getParameterAnnotation(SessionAttribute.class);
Assert.state(ann != null, "No SessionAttribute annotation");
return new NamedValueInfo(ann.name(), ann.required(), ValueConstants.DEFAULT_NONE);
}
@Override
protected Mono<Object> resolveName(String name, MethodParameter parameter, ServerWebExchange exchange) {
return exchange.getSession()
.filter(session -> session.getAttribute(name) != null)
.map(session -> session.getAttribute(name));
}
@Override
protected void handleMissingValue(String name, MethodParameter parameter) {
throw new MissingRequestValueException(
name, parameter.getNestedParameterType(), "session attribute", parameter);
}
}
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