/*
* Copyright 2002-2016 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
*
* http://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.Optional;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.web.bind.annotation.RequestAttribute;
import org.springframework.web.bind.annotation.ValueConstants;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.ServerWebInputException;
/**
* Resolves method arguments annotated with an @{@link RequestAttribute}.
*
* @author Rossen Stoyanchev
* @since 5.0
* @see SessionAttributeMethodArgumentResolver
*/
public class RequestAttributeMethodArgumentResolver extends AbstractNamedValueSyncArgumentResolver {
/**
* @param factory a bean factory to use for resolving ${...}
* placeholder and #{...} SpEL expressions in default values;
* or {@code null} if default values are not expected to have expressions
* @param registry for checking reactive type wrappers
*/
public RequestAttributeMethodArgumentResolver(ConfigurableBeanFactory factory, ReactiveAdapterRegistry registry) {
super(factory, registry);
}
@Override
public boolean supportsParameter(MethodParameter param) {
return checkAnnotatedParamNoReactiveWrapper(param, RequestAttribute.class, (annot, type) -> true);
}
@Override
protected NamedValueInfo createNamedValueInfo(MethodParameter parameter) {
RequestAttribute annot = parameter.getParameterAnnotation(RequestAttribute.class);
return new NamedValueInfo(annot.name(), annot.required(), ValueConstants.DEFAULT_NONE);
}
@Override
protected Optional<Object> resolveNamedValue(String name, MethodParameter parameter, ServerWebExchange exchange) {
return exchange.getAttribute(name);
}
@Override
protected void handleMissingValue(String name, MethodParameter parameter) {
String type = parameter.getNestedParameterType().getSimpleName();
String reason = "Missing request attribute '" + name + "' of type " + type;
throw new ServerWebInputException(reason, parameter);
}
}