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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.wink.providers.json4j;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import org.apache.wink.common.internal.utils.MediaTypeUtils;
import org.apache.wink.common.utils.ProviderUtils;
import org.apache.wink.json4j.JSONException;
import org.apache.wink.json4j.JSONObject;

@Provider
@Consumes(value = {MediaType.APPLICATION_JSON, "application/javascript"})
@Produces(value = {MediaType.APPLICATION_JSON, "application/javascript"})
public class JSON4JObjectProvider implements MessageBodyWriter,
    MessageBodyReader {

    public boolean isReadable(Class clazz,
                              Type type,
                              Annotation[] annotations,
                              MediaType mediaType) {
        return JSONObject.class == clazz;
    }

    public JSONObject readFrom(Class clazz,
                               Type type,
                               Annotation[] annotations,
                               MediaType mediaType,
                               MultivaluedMap headers,
                               InputStream is) throws IOException, WebApplicationException {
        try {
            return new JSONObject(new InputStreamReader(is, ProviderUtils.getCharset(mediaType)));
        } catch (JSONException e) {
            throw new WebApplicationException(e, Status.BAD_REQUEST);
        }
    }

    public long getSize(JSONObject obj,
                        Class clazz,
                        Type type,
                        Annotation[] annotations,
                        MediaType mediaType) {
        return -1;
    }

    public boolean isWriteable(Class clazz,
                               Type type,
                               Annotation[] annotations,
                               MediaType mediaType) {
        return JSONObject.class.isAssignableFrom(clazz);
    }

    public void writeTo(JSONObject obj,
                        Class clazz,
                        Type type,
                        Annotation[] annotations,
                        MediaType mediaType,
                        MultivaluedMap headers,
                        OutputStream os) throws IOException, WebApplicationException {
        mediaType = MediaTypeUtils.setDefaultCharsetOnMediaTypeHeader(headers, mediaType);
        OutputStreamWriter writer = new OutputStreamWriter(os, ProviderUtils.getCharset(mediaType));
        try {
            Writer json4jWriter = obj.write(writer);
            json4jWriter.flush();
            writer.flush();
        } catch (JSONException e) {
            throw new WebApplicationException(e, 500);
        }
    }
}