/*
* Copyright 2002-2011 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.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.springframework.core.MethodParameter;
import org.springframework.http.HttpHeaders;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestHeader;
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 {@code @RequestHeader}.
* For individual header values annotated with {@code @RequestHeader} see
* {@link RequestHeaderMethodArgumentResolver} instead.
*
* <p>The created {@link Map} contains all request header name/value pairs.
* The method parameter type may be a {@link MultiValueMap} to receive all
* values for a header, not only the first one.
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @since 3.1
*/
public class RequestHeaderMapMethodArgumentResolver implements HandlerMethodArgumentResolver {
public boolean supportsParameter(MethodParameter parameter) {
return parameter.hasParameterAnnotation(RequestHeader.class)
&& Map.class.isAssignableFrom(parameter.getParameterType());
}
public Object resolveArgument(MethodParameter parameter,
ModelAndViewContainer mavContainer,
NativeWebRequest webRequest,
WebDataBinderFactory binderFactory) throws Exception {
Class<?> paramType = parameter.getParameterType();
if (MultiValueMap.class.isAssignableFrom(paramType)) {
MultiValueMap<String, String> result;
if (HttpHeaders.class.isAssignableFrom(paramType)) {
result = new HttpHeaders();
}
else {
result = new LinkedMultiValueMap<String, String>();
}
for (Iterator<String> iterator = webRequest.getHeaderNames(); iterator.hasNext();) {
String headerName = iterator.next();
for (String headerValue : webRequest.getHeaderValues(headerName)) {
result.add(headerName, headerValue);
}
}
return result;
}
else {
Map<String, String> result = new LinkedHashMap<String, String>();
for (Iterator<String> iterator = webRequest.getHeaderNames(); iterator.hasNext();) {
String headerName = iterator.next();
String headerValue = webRequest.getHeader(headerName);
result.put(headerName, headerValue);
}
return result;
}
}
}