/*
    *   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
    *
   *     https://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.directory.api.ldap.codec.protocol.mina;
  
  
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.osgi.framework.BundleActivator;
  import org.osgi.framework.BundleContext;
  import org.osgi.framework.ServiceReference;
  import org.osgi.framework.ServiceRegistration;
  import org.osgi.util.tracker.ServiceTracker;
  import org.osgi.util.tracker.ServiceTrackerCustomizer;
  
  
  /**
   * The {@link org.osgi.framework.BundleActivator} for the codec.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class LdapProtocolCodecActivator implements BundleActivator
  {
      private ServiceTracker<LdapApiService, LdapApiService> serviceTracker;
  
      class LdapApiServiceTracker implements ServiceTrackerCustomizer<LdapApiService, LdapApiService>
      {
          private BundleContext bundleContext;
          private ServiceRegistration<?> registration;
  
  
          LdapApiServiceTracker( BundleContext context )
          {
              this.bundleContext = context;
          }
  
  
          @Override
          public LdapApiService addingService( ServiceReference<LdapApiService> reference )
          {
              LdapApiService ldapApiService = bundleContext.getService( reference );
              LdapProtocolCodecFactory factory = new LdapProtocolCodecFactory( ldapApiService );
              registration = bundleContext.registerService( LdapProtocolCodecFactory.class.getName(), factory, null );
              ldapApiService.registerProtocolCodecFactory( factory );
              return ldapApiService;
          }
  
  
          @Override
          public void modifiedService( ServiceReference<LdapApiService> reference, LdapApiService service )
          {
              // Do nothing ATM
          }
  
  
          @Override
          public void removedService( ServiceReference<LdapApiService> reference, LdapApiService service )
          {
              // TODO should we unregister the LdapProtocolCodecFactory at LdapApiService?
              // ldapApiService.unregisterProtocolCodecFactory( factory );
              registration.unregister();
          }
      }
  
  
      /**
       * Create a new instance of a LdapProtocolCodecActivator 
       */
      public LdapProtocolCodecActivator()
      {
          // Default constructor
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void start( BundleContext bundleContext ) throws Exception
      {
          LdapApiServiceTracker ldapApiServiceTracker = new LdapApiServiceTracker( bundleContext );
          serviceTracker = new ServiceTracker<>( bundleContext, LdapApiService.class,
              ldapApiServiceTracker );
          serviceTracker.open();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void stop( BundleContext bundleContext ) throws Exception
     {
         serviceTracker.close();
     }
 }