221     public function get_participant($user_id, $can_be_removed=false) {  argument
230         $r = $this->model->sqlite->query($q, $this->id, $user_id);
239     public function is_subscribent($user_id=null) {  argument
240         if ($user_id == null) {
241             $user_id = $this->model->user_nick;
243         $par = $this->get_participant($user_id);
250     public function remove_participant_flags($user_id, $flags) {  argument
256         $participant = $this->get_participant($user_id, true);
258             throw new ConsistencyViolationException("$user_id isn't participant");
269         $this->model->sqlite->query($sql, $this->id, $user_id);
273 	public function set_participant_flags($user_id, $flags=array()) {  argument
280         if (!$this->model->userFactory->exists($user_id)) {
281             throw new \Exception("$user_id isn't dokuwiki user");
289         $participant = $this->get_participant($user_id, true);
294             $participant['user_id'] = $user_id;
309             $this->model->sqlite->query($q, $this->id, $user_id);
314 	public function remove_participant($user_id) {  argument
320         $participant = $this->get_participant($user_id);
322             throw new ConsistencyViolationException("$user_id isn't participant");
334         $this->model->sqlite->query($q, $this->id, $user_id);