/*******************************************************************************
 * 
 * Copyright 2010 Alexandru Craciun, and individual contributors as indicated
 * by the @authors tag. 
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 ******************************************************************************/
package org.netxilia.server.rest.provider;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

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.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import org.netxilia.api.exception.StorageException;
import org.netxilia.api.storage.IJsonSerializer;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * This is a json provider using the implementation of {@link IJsonSerializer}.
 * 
 * @author <a href='mailto:ax.craciun@gmail.com'>Alexandru Craciun</a>
 * 
 */
@Provider
@Produces({ MediaType.APPLICATION_JSON, "text/json" })
public class JsonProvider implements MessageBodyWriter<Object> {
	@Autowired
	private IJsonSerializer jsonSerializer;

	public IJsonSerializer getJsonSerializer() {
		return jsonSerializer;
	}

	public void setJsonSerializer(IJsonSerializer jsonSerializer) {
		this.jsonSerializer = jsonSerializer;
	}

	@Override
	public long getSize(Object t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return -1;
	}

	@Override
	public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return true;
	}

	@Override
	public void writeTo(Object t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
			MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException,
			WebApplicationException {
		String json;
		try {
			json = jsonSerializer.serialize(t);
		} catch (StorageException e) {
			throw new WebApplicationException(e);
		}
		httpHeaders.putSingle(javax.ws.rs.core.HttpHeaders.CONTENT_TYPE, mediaType.toString() + ";charset=UTF-8");
		entityStream.write(json.getBytes());

	}
}