/**
* Initializes a new <tt>Conference</tt> instance which is to represent a conference in the terms
* of Jitsi Videobridge which has a specific (unique) ID and is managed by a conference focus with
* a specific JID.
*
* @param videobridge the <tt>Videobridge</tt> on which the new <tt>Conference</tt> instance is to
* be initialized
* @param id the (unique) ID of the new instance to be initialized
* @param focus the JID of the conference focus who has requested the initialization of the new
* instance and from whom further/future requests to manage the new instance must come or they
* will be ignored. Pass <tt>null</tt> to override this safety check.
*/
public Conference(Videobridge videobridge, String id, String focus) {
if (videobridge == null) throw new NullPointerException("videobridge");
if (id == null) throw new NullPointerException("id");
this.videobridge = videobridge;
this.id = id;
this.focus = focus;
this.lastKnownFocus = focus;
speechActivity = new ConferenceSpeechActivity(this);
speechActivity.addPropertyChangeListener(propertyChangeListener);
EventAdmin eventAdmin = videobridge.getEventAdmin();
if (eventAdmin != null) eventAdmin.sendEvent(EventFactory.conferenceCreated(this));
}
