/*******************************************************************************
 * Copyright (c) 2010 Neil Bartlett.
 * 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
 *
 * Contributors:
 *     Neil Bartlett - initial API and implementation
 *******************************************************************************/
package bndtools.utils;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

public class ServiceUtils {
    public static final <R, S, E extends Throwable> R usingService(BundleContext context, Class<S> clazz, ServiceOperation<R, S, E> operation) throws E {
        ServiceReference<S> reference = context.getServiceReference(clazz);
        if (reference != null) {
            S service = context.getService(reference);
            if (service != null) {
                try {
                    return operation.execute(service);
                } finally {
                    context.ungetService(reference);
                }
            }
        }
        return null;
    }
}