while (it.hasNext()) {
TrackBackListener listener = (TrackBackListener)it.next();
if (event.getType() == TrackBackEvent.TRACKBACK_ADDED) {
listener.trackBackAdded(event);
} else if (event.getType() == TrackBackEvent.TRACKBACK_REMOVED) {
listener.trackBackRemoved(event);
} else if (event.getType() == TrackBackEvent.TRACKBACK_APPROVED) {
listener.trackBackApproved(event);
} else if (event.getType() == TrackBackEvent.TRACKBACK_REJECTED) {
listener.trackBackRejected(event);
}