| /** |
| * 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(); |
| } |
| } |