spring RequestAttributeMethodArgumentResolver 源码
spring RequestAttributeMethodArgumentResolver 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestAttributeMethodArgumentResolver.java
/*
* Copyright 2002-2017 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.servlet.mvc.method.annotation;
import jakarta.servlet.ServletException;
import org.springframework.core.MethodParameter;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.annotation.RequestAttribute;
import org.springframework.web.bind.annotation.ValueConstants;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver;
/**
* Resolves method arguments annotated with an @{@link RequestAttribute}.
*
* @author Rossen Stoyanchev
* @since 4.3
*/
public class RequestAttributeMethodArgumentResolver extends AbstractNamedValueMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
return parameter.hasParameterAnnotation(RequestAttribute.class);
}
@Override
protected NamedValueInfo createNamedValueInfo(MethodParameter parameter) {
RequestAttribute ann = parameter.getParameterAnnotation(RequestAttribute.class);
Assert.state(ann != null, "No RequestAttribute annotation");
return new NamedValueInfo(ann.name(), ann.required(), ValueConstants.DEFAULT_NONE);
}
@Override
@Nullable
protected Object resolveName(String name, MethodParameter parameter, NativeWebRequest request){
return request.getAttribute(name, RequestAttributes.SCOPE_REQUEST);
}
@Override
protected void handleMissingValue(String name, MethodParameter parameter) throws ServletException {
throw new ServletRequestBindingException("Missing request attribute '" + name +
"' of type " + parameter.getNestedParameterType().getSimpleName());
}
}
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