/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.felix.useradmin.osgi;
import org.osgi.framework.BundleContext;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventAdmin;
import org.osgi.util.tracker.ServiceTracker;
/**
* Wraps a {@link ServiceTracker} as an {@link EventAdmin} allowing it to be
* used as a "normal" service without having to worry about the actual presence
* of the {@link EventAdmin} service itself.
*/
final class EventAdminHelper extends ServiceTracker implements EventAdmin {
/**
* Creates a new {@link EventAdminHelper} instance.
*
* @param context the bundle context to use, cannot be <code>null</code>.
*/
public EventAdminHelper(BundleContext context) {
super(context, EventAdmin.class.getName(), null /* customizer */);
}
/**
* {@inheritDoc}
*/
public void postEvent(Event event) {
EventAdmin eventAdmin = getEventAdmin();
if (eventAdmin != null) {
eventAdmin.postEvent(event);
}
}
/**
* {@inheritDoc}
*/
public void sendEvent(Event event) {
EventAdmin eventAdmin = getEventAdmin();
if (eventAdmin != null) {
eventAdmin.sendEvent(event);
}
}
/**
* Returns the event admin service, if available.
*
* @return the current event admin service, or <code>null</code> if it is not present.
*/
private EventAdmin getEventAdmin() {
return (EventAdmin) getService();
}
}