/*
* 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.Collections;
import java.util.Map;
import java.util.Optional;
import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.ui.ModelMap;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.reactive.HandlerMapping;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolver;
import org.springframework.web.server.ServerWebExchange;
/**
* Resolver for {@link Map} method arguments also annotated with
* {@link PathVariable @PathVariable} where the annotation does not specify a
* path variable name. The resulting {@link Map} argument is a coyp of all URI
* template name-value pairs.
*
* @author Rossen Stoyanchev
* @see PathVariableMethodArgumentResolver
*/
public class PathVariableMapMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
PathVariable ann = parameter.getParameterAnnotation(PathVariable.class);
return (ann != null && (Map.class.isAssignableFrom(parameter.getParameterType()))
&& !StringUtils.hasText(ann.value()));
}
/**
* Return a Map with all URI template variables or an empty map.
*/
@Override
public Mono<Object> resolveArgument(MethodParameter parameter, ModelMap model,
ServerWebExchange exchange) {
String name = HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE;
Optional<Object> value = exchange.getAttribute(name);
return (value.isPresent() ? Mono.just(value.get()) : Mono.just(Collections.emptyMap()));
}
}