/**
   * Gets an <tt>Endpoint</tt> participating in this <tt>Conference</tt> which has a specific
   * identifier/ID. If an <tt>Endpoint</tt> participating in this <tt>Conference</tt> with the
   * specified <tt>id</tt> does not exist at the time the method is invoked, the method optionally
   * initializes a new <tt>Endpoint</tt> instance with the specified <tt>id</tt> and adds it to the
   * list of <tt>Endpoint</tt>s participating in this <tt>Conference</tt>.
   *
   * @param id the identifier/ID of the <tt>Endpoint</tt> which is to be returned
   * @return an <tt>Endpoint</tt> participating in this <tt>Conference</tt> which has the specified
   *     <tt>id</tt> or <tt>null</tt> if there is no such <tt>Endpoint</tt> and <tt>create</tt>
   *     equals <tt>false</tt>
   */
  private Endpoint getEndpoint(String id, boolean create) {
    Endpoint endpoint = null;
    boolean changed = false;

    synchronized (endpoints) {
      for (Iterator<WeakReference<Endpoint>> i = endpoints.iterator(); i.hasNext(); ) {
        Endpoint e = i.next().get();

        if (e == null) {
          i.remove();
          changed = true;
        } else if (e.getID().equals(id)) {
          endpoint = e;
        }
      }

      if (create && endpoint == null) {
        endpoint = new Endpoint(id, this);
        // The propertyChangeListener will weakly reference this
        // Conference and will unregister itself from the endpoint
        // sooner or later.
        endpoint.addPropertyChangeListener(propertyChangeListener);
        endpoints.add(new WeakReference<>(endpoint));
        changed = true;

        EventAdmin eventAdmin = videobridge.getEventAdmin();
        if (eventAdmin != null) eventAdmin.sendEvent(EventFactory.endpointCreated(endpoint));
      }
    }

    if (changed) firePropertyChange(ENDPOINTS_PROPERTY_NAME, null, null);

    return endpoint;
  }