/**
     * The method is called by a ProtocolProvider implementation whenever a change in the
     * registration state of the corresponding provider had occurred.
     *
     * @param evt ProviderStatusChangeEvent the event describing the status change.
     */
    public void registrationStateChanged(RegistrationStateChangeEvent evt) {
      if (logger.isDebugEnabled())
        logger.debug(
            "The provider changed state from: " + evt.getOldState() + " to: " + evt.getNewState());

      if (evt.getNewState() == RegistrationState.REGISTERED) {
        opSetPersPresence =
            (OperationSetPersistentPresenceJabberImpl)
                jabberProvider.getOperationSet(OperationSetPersistentPresence.class);

        // Create the Jabber FileTransferManager.
        manager = new FileTransferManager(jabberProvider.getConnection());

        fileTransferRequestListener = new FileTransferRequestListener();

        ProviderManager.getInstance()
            .addIQProvider(FileElement.ELEMENT_NAME, FileElement.NAMESPACE, new FileElement());

        ProviderManager.getInstance()
            .addIQProvider(ThumbnailIQ.ELEMENT_NAME, ThumbnailIQ.NAMESPACE, new ThumbnailIQ());

        jabberProvider
            .getConnection()
            .addPacketListener(
                fileTransferRequestListener,
                new AndFilter(
                    new PacketTypeFilter(StreamInitiation.class), new IQTypeFilter(IQ.Type.SET)));
      } else if (evt.getNewState() == RegistrationState.UNREGISTERED) {
        if (fileTransferRequestListener != null && jabberProvider.getConnection() != null) {
          jabberProvider.getConnection().removePacketListener(fileTransferRequestListener);
        }

        ProviderManager providerManager = ProviderManager.getInstance();
        if (providerManager != null) {
          ProviderManager.getInstance()
              .removeIQProvider(FileElement.ELEMENT_NAME, FileElement.NAMESPACE);

          ProviderManager.getInstance()
              .removeIQProvider(ThumbnailIQ.ELEMENT_NAME, ThumbnailIQ.NAMESPACE);
        }

        fileTransferRequestListener = null;
        manager = null;
      }
    }
  /**
   * {@inheritDoc}
   *
   * <p>Implements {@link RegistrationStateChangeListener}. Notifies this instance that there has
   * been a change in the <tt>RegistrationState</tt> of {@link #protocolProvider}. Subscribes this
   * instance to {@link ColibriConferenceIQ}s as soon as <tt>protocolProvider</tt> is registered and
   * unsubscribes it as soon as <tt>protocolProvider</tt> is unregistered.
   */
  public void registrationStateChanged(RegistrationStateChangeEvent ev) {
    RegistrationState registrationState = ev.getNewState();

    if (RegistrationState.REGISTERED.equals(registrationState)) {
      protocolProvider.getConnection().addPacketListener(this, this);
    } else if (RegistrationState.UNREGISTERED.equals(registrationState)) {
      XMPPConnection connection = protocolProvider.getConnection();

      if (connection != null) connection.removePacketListener(this);
    }
  }
    /**
     * The method is called by a ProtocolProvider implementation whenever a change in the
     * registration state of the corresponding provider had occurred.
     *
     * @param evt ProviderStatusChangeEvent the event describing the status change.
     */
    public void registrationStateChanged(RegistrationStateChangeEvent evt) {
      if (logger.isDebugEnabled())
        logger.debug(
            "The provider changed state from: " + evt.getOldState() + " to: " + evt.getNewState());

      if (evt.getNewState() == RegistrationState.REGISTERING) {
        opSetPersPresence =
            (OperationSetPersistentPresenceJabberImpl)
                jabberProvider.getOperationSet(OperationSetPersistentPresence.class);

        if (smackMessageListener == null) {
          smackMessageListener = new SmackMessageListener();
        } else {
          // make sure this listener is not already installed in this
          // connection
          jabberProvider.getConnection().removePacketListener(smackMessageListener);
        }

        jabberProvider
            .getConnection()
            .addPacketListener(
                smackMessageListener,
                new AndFilter(packetFilters.toArray(new PacketFilter[packetFilters.size()])));
      } else if (evt.getNewState() == RegistrationState.REGISTERED) {
        new Thread(
                new Runnable() {
                  @Override
                  public void run() {
                    initAdditionalServices();
                  }
                })
            .start();
      } else if (evt.getNewState() == RegistrationState.UNREGISTERED
          || evt.getNewState() == RegistrationState.CONNECTION_FAILED
          || evt.getNewState() == RegistrationState.AUTHENTICATION_FAILED) {
        if (jabberProvider.getConnection() != null) {
          if (smackMessageListener != null)
            jabberProvider.getConnection().removePacketListener(smackMessageListener);
        }

        smackMessageListener = null;
      }
    }