/**
  * Transforms a complete list of {@link PtuFlexOffer} to a {@link FlexOfferDto}.
  *
  * @param ptuFlexOffers a {@link java.util.List} of {@link PtuFlexOffer}.
  * @return a {@link FlexOfferDto}.
  */
 public static FlexOfferDto transformPtuFlexOffers(List<PtuFlexOffer> ptuFlexOffers) {
   if (ptuFlexOffers == null || ptuFlexOffers.isEmpty()) {
     return null;
   }
   PtuFlexOffer firstPtuFlexOffer = ptuFlexOffers.get(0);
   FlexOfferDto flexOfferDto = new FlexOfferDto();
   flexOfferDto.setParticipantDomain(firstPtuFlexOffer.getParticipantDomain());
   flexOfferDto.setConnectionGroupEntityAddress(
       firstPtuFlexOffer.getConnectionGroup().getUsefIdentifier());
   flexOfferDto.setPeriod(firstPtuFlexOffer.getPtuContainer().getPtuDate());
   flexOfferDto.setFlexRequestSequenceNumber(firstPtuFlexOffer.getFlexRequestSequence());
   flexOfferDto.setSequenceNumber(firstPtuFlexOffer.getSequence());
   ptuFlexOffers
       .stream()
       .forEach(ptuFlexOffer -> flexOfferDto.getPtus().add(transformPtuFlexOffer(ptuFlexOffer)));
   return flexOfferDto;
 }
 private void populateFlexOfferDto(
     FlexOfferDto flexOfferDto, FlexRequestDto flexRequestDto, boolean populatePtus) {
   flexOfferDto.setPeriod(flexRequestDto.getPeriod());
   flexOfferDto.setConnectionGroupEntityAddress(flexRequestDto.getConnectionGroupEntityAddress());
   flexOfferDto.setParticipantDomain(flexRequestDto.getParticipantDomain());
   if (populatePtus) {
     flexRequestDto
         .getPtus()
         .stream()
         .forEach(
             ptuFlexRequestDto -> {
               PtuFlexOfferDto ptuFlexOfferDto = new PtuFlexOfferDto();
               ptuFlexOfferDto.setPtuIndex(ptuFlexRequestDto.getPtuIndex());
               if (ptuFlexRequestDto.getDisposition() == DispositionTypeDto.AVAILABLE) {
                 ptuFlexOfferDto.setPrice(BigDecimal.ZERO);
                 ptuFlexOfferDto.setPower(BigInteger.ZERO);
               } else {
                 max100PercentOfOriginalPower(ptuFlexRequestDto, ptuFlexOfferDto);
               }
               flexOfferDto.getPtus().add(ptuFlexOfferDto);
             });
   }
 }