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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library 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 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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.
 */

package com.liferay.osgi.service.tracker.collections.internal;

import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;

/**
 * @author Carlos Sierra Andrés
 */
public class ServiceTrackerUtil {

	public static  ServiceTracker createServiceTracker(
		BundleContext bundleContext, Class clazz, String filterString,
		ServiceTrackerCustomizer serviceTrackerCustomizer) {

		if (filterString != null) {
			try {
				Filter filter = bundleContext.createFilter(
					"(&(objectClass=" + clazz.getName() + ")" + filterString +
						")");

				return new ServiceTracker<>(
					bundleContext, filter, serviceTrackerCustomizer);
			}
			catch (InvalidSyntaxException ise) {
				throwException(ise);

				return null;
			}
		}
		else {
			return new ServiceTracker<>(
				bundleContext, clazz, serviceTrackerCustomizer);
		}
	}

	public static  T throwException(Throwable throwable) {
		return ServiceTrackerUtil._throwException(
			throwable);
	}

	private static  T _throwException(
			Throwable throwable)
		throws E {

		throw (E)throwable;
	}

}