spring PathVariableMapMethodArgumentResolver 源码
spring PathVariableMapMethodArgumentResolver 代码
文件路径：/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/PathVariableMapMethodArgumentResolver.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 java.util.Collections;
import java.util.Map;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.HandlerMapping;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport;
import org.springframework.web.reactive.result.method.SyncHandlerMethodArgumentResolver;
import org.springframework.web.server.ServerWebExchange;
/**
* Resolver for {@link Map} method arguments annotated with
* {@link PathVariable @PathVariable} where the annotation does not specify a
* path variable name. The resulting {@link Map} argument is a copy of all URI
* template name-value pairs.
*
* @author Rossen Stoyanchev
* @since 5.0
* @see PathVariableMethodArgumentResolver
*/
public class PathVariableMapMethodArgumentResolver extends HandlerMethodArgumentResolverSupport
implements SyncHandlerMethodArgumentResolver {
public PathVariableMapMethodArgumentResolver(ReactiveAdapterRegistry adapterRegistry) {
super(adapterRegistry);
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
return checkAnnotatedParamNoReactiveWrapper(parameter, PathVariable.class, this::allVariables);
}
private boolean allVariables(PathVariable pathVariable, Class<?> type) {
return (Map.class.isAssignableFrom(type) && !StringUtils.hasText(pathVariable.value()));
}
@Override
public Object resolveArgumentValue(
MethodParameter methodParameter, BindingContext context, ServerWebExchange exchange) {
String name = HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE;
return exchange.getAttributeOrDefault(name, Collections.emptyMap());
}
}
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