/*******************************************************************************
 * Copyright (c) 2013-2016 LAAS-CNRS (www.laas.fr)
 * 7 Colonel Roche 31077 Toulouse - France
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Initial Contributors:
 *     Thierry Monteil : Project manager, technical co-manager
 *     Mahdi Ben Alaya : Technical co-manager
 *     Samir Medjiah : Technical co-manager
 *     Khalil Drira : Strategy expert
 *     Guillaume Garzone : Developer
 *     François Aïssaoui : Developer
 *
 * New contributors :
 *******************************************************************************/
package org.eclipse.om2m.commons.obix.io;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Mapper class to convert oBIX XML representation to java object or vice-versa
 * 
 * @author Francois Aissaoui
 *
 */
public class ObixMapper {
	/** Logger */
	private static final Log LOGGER = LogFactory.getLog(ObixMapper.class);
	/** Current instance of the mapper */
	private static ObixMapper obixMapper;
	/** JAXB Context of oBIX objects */
	private JAXBContext context;
	
	/** Package containing oBIX objects */
	private static final String OBIX_PACKAGE = "org.eclipse.om2m.commons.obix";

	private ObixMapper() {
		try {
			context = JAXBContext.newInstance(OBIX_PACKAGE, ObixMapper.class.getClassLoader());
		} catch (JAXBException e) {
			LOGGER.error("Error creating the JAXB context for Obix objects", e);
		}
	}

	protected JAXBContext getJAXBContext() {
		return context;
	}

	/**
	 * Return the current instance of the oBIX mapper
	 * 
	 * @return current instance of ObixMapper
	 */
	public static ObixMapper getInstance() {
		if(obixMapper == null){
			obixMapper = new ObixMapper();
		}
		return obixMapper;
	}

}