@Synchronized("accessLock") public boolean containsUser(@NonNull String nick){
  String nickLowercase=nick.toLowerCase(locale);
  return userNickMap.containsKey(nickLowercase) || privateUsers.containsKey(nickLowercase);
}

@ Synchronized ( "accessLock" ) public boolean containsUser ( @ NonNull String nick ) { String nickLowercase = nick . toLowerCase ( locale ) ; return userNickMap . containsKey ( nickLowercase ) || privateUsers . containsKey ( nickLowercase ) ; }
check if user exists by nick
