public Set<SystemPermission.Type> getSystemPermissions() {
        return systemPermissions;
    }
Returns the set of granted system-level permissions. If no permissions
are granted at the system level, this will be an empty set. This set is
mutable, and changes to this set will affect the permission set
directly.

@return
    The set of granted system-level permissions.
guacamole/src/main/java/org/apache/guacamole/rest/permission/APIPermissionSet.java