/*
* Copyright 2002-2014 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.accept;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.http.MediaType;
import org.springframework.util.Assert;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.context.request.NativeWebRequest;
/**
* A ContentNegotiationStrategy that uses a request parameter to determine what
* media types are requested. The default parameter name is {@code format}.
* Its value is used to look up the media type in the map given to the constructor.
*
* @author Rossen Stoyanchev
* @since 3.2
*/
public class ParameterContentNegotiationStrategy extends AbstractMappingContentNegotiationStrategy {
private static final Log logger = LogFactory.getLog(ParameterContentNegotiationStrategy.class);
private String parameterName = "format";
/**
* Create an instance with the given extension-to-MediaType lookup.
* @throws IllegalArgumentException if a media type string cannot be parsed
*/
public ParameterContentNegotiationStrategy(Map<String, MediaType> mediaTypes) {
super(mediaTypes);
}
/**
* Set the parameter name that can be used to determine the requested media type.
* <p>The default parameter name is {@code format}.
*/
public void setParameterName(String parameterName) {
Assert.notNull(parameterName, "parameterName is required");
this.parameterName = parameterName;
}
@Override
protected String getMediaTypeKey(NativeWebRequest webRequest) {
return webRequest.getParameter(this.parameterName);
}
@Override
protected void handleMatch(String mediaTypeKey, MediaType mediaType) {
if (logger.isDebugEnabled()) {
logger.debug("Requested media type is '" + mediaType + "' (based on parameter '" +
this.parameterName + "'='" + mediaTypeKey + "')");
}
}
@Override
protected MediaType handleNoMatch(NativeWebRequest request, String key) throws HttpMediaTypeNotAcceptableException {
throw new HttpMediaTypeNotAcceptableException(getAllMediaTypes());
}
}