| /* |
| * 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.sling.installer.factories.subsystems.impl; |
| |
| import java.util.Dictionary; |
| import java.util.Hashtable; |
| |
| import org.apache.sling.installer.api.tasks.InstallTaskFactory; |
| import org.apache.sling.installer.api.tasks.ResourceTransformer; |
| import org.osgi.framework.BundleActivator; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.Constants; |
| import org.osgi.framework.ServiceReference; |
| import org.osgi.framework.ServiceRegistration; |
| import org.osgi.service.subsystem.Subsystem; |
| import org.osgi.service.subsystem.SubsystemConstants; |
| import org.osgi.util.tracker.ServiceTracker; |
| import org.osgi.util.tracker.ServiceTrackerCustomizer; |
| |
| public class Activator implements BundleActivator { |
| |
| /** The service tracker for the root subsystem */ |
| private ServiceTracker<Subsystem, Subsystem> rootSubsystemTracker; |
| |
| /** The service registration for the installer service. */ |
| private ServiceRegistration<?> serviceReg; |
| |
| /** |
| * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext) |
| */ |
| public void start(final BundleContext context) throws Exception { |
| this.rootSubsystemTracker = new ServiceTracker<Subsystem, Subsystem>(context, |
| context.createFilter("(&(" + Constants.OBJECTCLASS + "=" + Subsystem.class.getName() + ")" + |
| "(" + SubsystemConstants.SUBSYSTEM_ID_PROPERTY + "=0))"), |
| |
| new ServiceTrackerCustomizer<Subsystem, Subsystem>() { |
| |
| public Subsystem addingService(final ServiceReference<Subsystem> reference) { |
| final Subsystem service = context.getService(reference); |
| if ( service != null ) { |
| registerInstaller(context, service); |
| } |
| return service; |
| } |
| |
| public void modifiedService(final ServiceReference<Subsystem> reference, final Subsystem service) { |
| // nothing to do |
| } |
| |
| public void removedService(final ServiceReference<Subsystem> reference, final Subsystem service) { |
| unregisterInstaller(); |
| } |
| |
| }); |
| this.rootSubsystemTracker.open(); |
| } |
| |
| /** |
| * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext) |
| */ |
| public void stop(final BundleContext context) throws Exception { |
| if ( this.rootSubsystemTracker != null ) { |
| this.rootSubsystemTracker.close(); |
| this.rootSubsystemTracker = null; |
| } |
| this.unregisterInstaller(); |
| } |
| |
| private void registerInstaller(final BundleContext context, final Subsystem rootSubsystem) { |
| final Dictionary<String, Object> props = new Hashtable<String, Object>(); |
| props.put(Constants.SERVICE_DESCRIPTION, "Apache Sling Installer Support for Subsystems"); |
| props.put(Constants.SERVICE_VENDOR, "The Apache Software Foundation"); |
| this.serviceReg = context.registerService( |
| new String[] {ResourceTransformer.class.getName(), InstallTaskFactory.class.getName()}, |
| new SubsystemInstaller(rootSubsystem, context), props); |
| } |
| |
| private void unregisterInstaller() { |
| if ( serviceReg != null ) { |
| serviceReg.unregister(); |
| serviceReg = null; |
| } |
| } |
| } |