libraries/rest-server/src/main/java/org/apache/zest/library/rest/server/restlet/responsewriter/JSONResponseWriter.java

/**
 *
 * 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.apache.zest.library.rest.server.restlet.responsewriter;

import java.util.Arrays;
import java.util.List;
import org.json.JSONObject;
import org.restlet.Response;
import org.restlet.data.MediaType;
import org.restlet.representation.StringRepresentation;
import org.restlet.resource.ResourceException;

/**
 * Handles JSONObject output
 */
public class JSONResponseWriter extends AbstractResponseWriter
{
    private static final List<MediaType> supportedMediaTypes = Arrays.asList( MediaType.TEXT_HTML, MediaType.APPLICATION_JSON );

    @Override
    public boolean writeResponse( final Object result, final Response response )
        throws ResourceException
    {
        if( result instanceof JSONObject )
        {
            MediaType type = getVariant( response.getRequest(), ENGLISH, supportedMediaTypes ).getMediaType();
            if( MediaType.APPLICATION_JSON.equals( type ) )
            {
                JSONObject json = (JSONObject) result;
                StringRepresentation representation
                    = new StringRepresentation( json.toString(), MediaType.APPLICATION_JSON );
                response.setEntity( representation );
                return true;
            }
            else if( MediaType.TEXT_HTML.equals( type ) )
            {
                JSONObject json = (JSONObject) result;
                StringRepresentation representation
                    = new StringRepresentation( json.toString(), MediaType.TEXT_HTML );
                response.setEntity( representation );
                return true;
            }
        }
        return false;
    }
}