/*
* Copyright 2002-2012 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.method.annotation;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.core.MethodParameter;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
/**
* Resolves {@link Map} method arguments annotated with an @{@link 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 Arjen Poutsma
* @author Rossen Stoyanchev
* @since 3.1
* @see RequestParamMethodArgumentResolver
*/
public class RequestParamMapMethodArgumentResolver implements HandlerMethodArgumentResolver {
public boolean supportsParameter(MethodParameter parameter) {
RequestParam requestParamAnnot = parameter.getParameterAnnotation(RequestParam.class);
if (requestParamAnnot != null) {
if (Map.class.isAssignableFrom(parameter.getParameterType())) {
return !StringUtils.hasText(requestParamAnnot.value());
}
}
return false;
}
public Object resolveArgument(
MethodParameter parameter, ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, WebDataBinderFactory binderFactory)
throws Exception {
Class<?> paramType = parameter.getParameterType();
Map<String, String[]> parameterMap = webRequest.getParameterMap();
if (MultiValueMap.class.isAssignableFrom(paramType)) {
MultiValueMap<String, String> result = new LinkedMultiValueMap<String, String>(parameterMap.size());
for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
for (String value : entry.getValue()) {
result.add(entry.getKey(), value);
}
}
return result;
}
else {
Map<String, String> result = new LinkedHashMap<String, String>(parameterMap.size());
for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
if (entry.getValue().length > 0) {
result.put(entry.getKey(), entry.getValue()[0]);
}
}
return result;
}
}
}