class PsuDataMapper {

    public List<PsuData> mapToPsuDataList(List<PsuIdData> psuIdDataList, String instanceId) {
        return psuIdDataList.stream()
                   .map(psu -> mapToPsuData(psu, instanceId))
                   .filter(Objects::nonNull)
                   .collect(Collectors.toList());
    }

}