check if permission is valid -> if not check parent

IotPermission permission = null;
// get only valid permissions
List<IotPermission> permissions = getValidPermissionsListByPlateNumber(plateNumber);

// check if permission is for this carpark
boolean isCarparkFound = false;
for (IotPermission perm : permissions) {
    if (carparkId.equals(perm.getCarParkRef())) {
        isCarparkFound = true;
        permission = perm;
        break;
    }
}

// check permission for parent carpark
if (!isCarparkFound) {
    Integer parentCarpark = entrance.getGatewayRef().getCarParkRef().getParentCarParkRef();
    for (IotPermission perm : permissions) {
        if (parentCarpark != null && parentCarpark.equals(perm.getCarParkRef())) {
            permission = perm;
            break;
        }
    }
}