/**
 * Copyright (c) 2011, 2014 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0 
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors: 
 * 		Florian Pirchner - Initial implementation
 */
package org.eclipse.osbp.dsl.tests.model;

import javax.persistence.EntityManagerFactory;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;

public class Activator implements BundleActivator {

	public BundleContext context;

	@Override
	public void start(BundleContext context) throws Exception {
		this.context = context;
	}

	@Override
	public void stop(BundleContext context) throws Exception {
		this.context = null;
	}

	/**
	 * Returns the entity manager factory or <code>null</code>.
	 * 
	 * @return
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static EntityManagerFactory getEMF() {
		BundleContext context = FrameworkUtil.getBundle(Activator.class)
				.getBundleContext();
		ServiceReference[] refs;
		try {
			refs = context.getServiceReferences(
					EntityManagerFactory.class.getName(),
					"(osgi.unit.name=dbDerby)");
			if (refs != null) {
				return (EntityManagerFactory) context.getService(refs[0]);
			}
		} catch (InvalidSyntaxException e) {
			throw new RuntimeException(e);
		}

		return null;
	}
}