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/**
 * Copyright 2012 Impetus Infotech.
 *
 * 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 com.impetus.kundera.rest.common;

import java.io.InputStream;
import java.io.StringWriter;

import javax.ws.rs.core.MediaType;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.api.json.JSONJAXBContext;
import com.sun.jersey.api.json.JSONUnmarshaller;

/**
 * Utility for converting objects into XML and vice versa
 * 
 * @author amresh.singh
 */
public class JAXBUtils
{
    private static Logger log = LoggerFactory.getLogger(JAXBUtils.class);

    /**
     * Converts InputStream to Object using JAXB
     * 
     * @param str
     * @param objectClass
     * @return
     */
    public static Object toObject(InputStream is, Class objectClass, String mediaType)
    {
        Object output = null;

        try
        {
            output = objectClass.newInstance();

            if (MediaType.APPLICATION_XML.equals(mediaType))
            {
                JAXBContext jaxbContext = JAXBContext.newInstance(objectClass);

                Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();

                output = jaxbUnmarshaller.unmarshal(is);
            }
            else if (MediaType.APPLICATION_JSON.equals(mediaType))
            {

                JSONJAXBContext context = new JSONJAXBContext(JSONConfiguration.mappedJettison().build(), objectClass);
                JSONUnmarshaller jsonUnmarshaller = context.createJSONUnmarshaller();

                output = jsonUnmarshaller.unmarshalFromJSON(is, objectClass);
            }

        }
        catch (JAXBException e)
        {
            log.warn("Error while converting String to Object using JAXB:" + e.getMessage());
            return null;
        }
        catch (InstantiationException e)
        {
            log.warn("Error while converting String to Object using JAXB:" + e.getMessage());
            return null;
        }
        catch (IllegalAccessException e)
        {
            log.warn("Error while converting String to Object using JAXB:" + e.getMessage());
            return null;
        }
        return output;
    }

    public static String toString(Class objectClass, Object object, String mediaType)
    {
        try
        {
            if (MediaType.APPLICATION_XML.equals(mediaType))
            {
                JAXBContext jaxbContext = JAXBContext.newInstance(objectClass);
                Marshaller jaxbMarshaller = jaxbContext.createMarshaller();

                StringWriter writer = new StringWriter();

                jaxbMarshaller.marshal(object, writer);
                return writer.toString();

            }
            else if (MediaType.APPLICATION_JSON.equals(mediaType))
            {
                return null;
            }
            else
            {
                return null;
            }
        }
        catch (JAXBException e)
        {
            log.error("Error during translation, Caused by:" + e.getMessage() + ", returning null");
            return null;
        }
    }

}