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/*******************************************************************************
* Copyright (c) 2001, 2005 IBM Corporation.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.useradmin;
import java.util.Hashtable;
import org.osgi.framework.*;
import org.osgi.service.prefs.PreferencesService;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
/** This is the bundle activator for the UserAdmin bundle.
*/
public class Activator implements BundleActivator, ServiceFactory, ServiceTrackerCustomizer {
/*
* ----------------------------------------------------------------------
* BundleActivator Interface implementation
* ----------------------------------------------------------------------
*/
protected ServiceRegistration registration;
protected UserAdmin userAdmin;
protected static String userAdminClazz = "org.osgi.service.useradmin.UserAdmin"; //$NON-NLS-1$
protected PreferencesService prefs;
protected BundleContext context;
protected ServiceTracker prefsTracker;
public Activator() {
//a public constructor is required for a BundleActivator
}
/**
* Required by BundleActivator Interface.
*/
public void start(BundleContext context_) throws Exception {
this.context = context_;
prefsTracker = new ServiceTracker(context, PreferencesService.class.getName(), this);
prefsTracker.open();
}
/**
* Required by BundleActivator Interface.
*/
public void stop(BundleContext context_) throws Exception {
prefsTracker.close();
unregisterUserAdminService();
}
public Object getService(Bundle bundle, ServiceRegistration registration_) {
userAdmin.setServiceReference(registration_.getReference());
return userAdmin;
}
public void ungetService(Bundle bundle, ServiceRegistration registration_, Object service) {
//do nothing
}
public Object addingService(ServiceReference reference) {
if (prefs == null) {
prefs = (PreferencesService) context.getService(reference);
try {
registerUserAdminService();
} catch (Exception ex) {
return null;
}
return prefs;
}
return null; //we don't want to track a service we are not using
}
public void modifiedService(ServiceReference reference, Object service) {
// do nothing
}
public void removedService(ServiceReference reference, Object service) {
if (service == prefs) {
prefs = null;
}
unregisterUserAdminService();
}
/**
* Register the UserAdmin service.
*/
protected void registerUserAdminService() throws Exception {
Hashtable properties = new Hashtable(7);
properties.put(Constants.SERVICE_VENDOR, UserAdminMsg.Service_Vendor);
properties.put(Constants.SERVICE_DESCRIPTION, UserAdminMsg.OSGi_User_Admin_service_IBM_Implementation_3);
properties.put(Constants.SERVICE_PID, getClass().getName());
userAdmin = new UserAdmin(prefs, context);
registration = context.registerService(userAdminClazz, this, properties);
userAdmin.setServiceReference(registration.getReference());
}
protected void unregisterUserAdminService() {
if(registration != null)
{
registration.unregister();
registration = null;
userAdmin.destroy();
userAdmin = null;
}
}
}
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