code: public boolean isAdministrator() throws GuacamoleException {
          SystemPermissionSet systemPermissionSet = getEffective().getSystemPermissions();
          return systemPermissionSet.hasPermission(SystemPermission.Type.ADMINISTER);
      }
docs: Returns whether this entity is a system administrator, and thus is not
  restricted by permissions, taking into account permission inheritance
  via user groups.
  
  @return
  true if this entity is a system administrator, false otherwise.
  
  @throws GuacamoleException
  If an error occurs while determining the entity's system administrator
  status.