/*
* 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
*
* 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.Map;
import java.util.Optional;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.util.MultiValueMap;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.reactive.BindingContext;
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 RequestParam @RequestParam} where the annotation does not specify a
* request parameter name. See {@link RequestParamMethodArgumentResolver} for
* resolving {@link Map} method arguments with a request parameter name.
*
* <p>The created {@link Map} contains all request parameter name-value pairs.
* If the method parameter type is {@link MultiValueMap} instead, the created
* map contains all request parameters and all there values for cases where
* request parameters have multiple values.
*
* @author Rossen Stoyanchev
* @author Sebastien Deleuze
* @since 5.0
* @see RequestParamMethodArgumentResolver
*/
public class RequestParamMapMethodArgumentResolver extends HandlerMethodArgumentResolverSupport
implements SyncHandlerMethodArgumentResolver {
public RequestParamMapMethodArgumentResolver(ReactiveAdapterRegistry adapterRegistry) {
super(adapterRegistry);
}
@Override
public boolean supportsParameter(MethodParameter param) {
return checkAnnotatedParamNoReactiveWrapper(param, RequestParam.class, this::allParams);
}
private boolean allParams(RequestParam requestParam, Class<?> type) {
return Map.class.isAssignableFrom(type) && !StringUtils.hasText(requestParam.name());
}
@Override
public Optional<Object> resolveArgumentValue(MethodParameter methodParameter,
BindingContext context, ServerWebExchange exchange) {
boolean isMultiValueMap = MultiValueMap.class.isAssignableFrom(methodParameter.getParameterType());
MultiValueMap<String, String> queryParams = exchange.getRequest().getQueryParams();
Object value = isMultiValueMap ? queryParams : queryParams.toSingleValueMap();
return Optional.of(value);
}
}