/**
*
* Copyright 2009-2011 Rickard Öberg AB
*
* 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.qi4j.library.rest.server.restlet.responsewriter;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.qi4j.library.rest.server.spi.ResponseWriter;
import org.restlet.Request;
import org.restlet.data.CharacterSet;
import org.restlet.data.Language;
import org.restlet.data.MediaType;
import org.restlet.representation.Variant;
/**
* Helper methods for ResponseWriters
*/
public abstract class AbstractResponseWriter
implements ResponseWriter
{
protected static List<Language> ENGLISH = Arrays.asList( Language.ENGLISH );
protected Variant getVariant( Request request,
List<Language> possibleLanguages,
List<MediaType> possibleMediaTypes
)
{
Language language = request.getClientInfo().getPreferredLanguage( possibleLanguages );
if( language == null )
{
language = possibleLanguages.get( 0 );
}
MediaType responseType = request.getClientInfo().getPreferredMediaType( possibleMediaTypes );
if( responseType == null && request.getClientInfo()
.getPreferredMediaType( Collections.singletonList( MediaType.ALL ) ) == MediaType.ALL )
{
responseType = possibleMediaTypes.get( 0 );
}
Variant variant = new Variant( responseType, language );
variant.setCharacterSet( CharacterSet.UTF_8 );
return variant;
}
}