Functional Programming 

Optional.ofNullable(supplementaryOfferings)
        .ifPresentOrElse((supplementaryOfferingsList) -> {
            Optional<SupplementaryOfferingDto> collect = supplementaryOfferingsList.stream()
                    .filter(s -> s.getOfferingName()
                            .contains(primaryOffering.getOfferingName().toUpperCase()))
                    .findFirst();
            if (collect.isPresent() && ACTIVE.equals(collect.get().getStatus())) {
                setActivationStatus(entity, ACTIVE.getName());
            }
        }, () -> {
            if (ACTIVE.name().equals(primaryOffering.getStatus())) {
                setActivationStatus(entity, ACTIVE.getName());
            }
        });

Here's the breakdown:

  1. Optional.ofNullable(supplementaryOfferings): Creates an Optional object with the value of supplementaryOfferings. If supplementaryOfferings is null, an empty Optional is created.

  2. .ifPresentOrElse((supplementaryOfferingsList) -> {...}, () -> {...}): This method is used to perform one of two actions based on whether the Optional contains a non-null value (supplementaryOfferings) or is empty.

    • (supplementaryOfferingsList) -> {...}: If supplementaryOfferings is not null, this lambda expression is executed. It operates on the assumption that supplementaryOfferings is a list. Inside this block:

      • It creates a stream from the list of SupplementaryOfferingDto.
      • Filters the stream based on whether the offeringName contains the uppercase version of primaryOffering.getOfferingName().
      • Uses findFirst() to get the first matching element.
      • If the element is present and its status is ACTIVE, it sets the activation status of entity using setActivationStatus.

    • () -> {...}: If supplementaryOfferings is null or an empty list, this lambda expression is executed. Inside this block:

      • Checks if the status of primaryOffering is ACTIVE.
      • If true, it sets the activation status of entity using setActivationStatus.

In summary, the code checks for the presence of supplementaryOfferings and performs different actions based on whether it is present and contains certain conditions or if it is absent and the status of primaryOffering is ACTIVE. The use of Optional helps handle potential null situations more elegantly.



2. Instead of : 

if (Objects.nonNull(supplementOfferByMsisdn.getData())) {
    Optional<SupplementaryOfferOutput> first = supplementOfferByMsisdn.getData()
            .stream()
            .filter(so -> Objects.equals(so.getNgbssId(), numberTariffProjection.getExtId()))
            .findFirst();
    if (first.isPresent() && ACTIVE.getName().equals(first.get().getStatus())) {
        setActivationStatus(entity, ACTIVE.getName());
    }
}

write this:

Optional.ofNullable(supplementOfferByMsisdn.getData())
        .map(data -> data.stream()
                .filter(so -> Objects.equals(so.getNgbssId(), numberTariffProjection.getExtId()))
                .findFirst())
        .filter(found -> found.isPresent() && ACTIVE.getName().equals(found.get().getStatus()))
        .ifPresent(result -> setActivationStatus(entity, ACTIVE.getName()));


--------------------------------------------------------------------------------------------------------------------------------

//package az.azerconnect.sales.salesprocess.service.impl;
//
//import az.azerconnect.sales.salesprocess.clients.GenericResponse;
//import az.azerconnect.sales.salesprocess.clients.ngbss.azerfon.NgbssAzerfonClient;
//import az.azerconnect.sales.salesprocess.clients.ngbss.azerfon.model.response.PrimaryOfferingAzf;
//import az.azerconnect.sales.salesprocess.clients.ngbss.azerfon.model.response.SubscriberAzfPrimaryOfferResponse;
//import az.azerconnect.sales.salesprocess.constants.types.TariffTypes;
//import az.azerconnect.sales.salesprocess.dto.response.SupplementaryOfferingDto;
//import az.azerconnect.sales.salesprocess.entity.TariffEntity;
//import az.azerconnect.sales.salesprocess.projection.NumberTariffProjection;
//import az.azerconnect.sales.salesprocess.repository.TariffRepository;
//import az.azerconnect.sales.salesprocess.service.AzfTariffActivationService;
//import lombok.RequiredArgsConstructor;
//import org.springframework.stereotype.Service;
//
//import java.util.List;
//import java.util.Optional;
//
//import static az.azerconnect.sales.salesprocess.constants.OfferingStatus.ACTIVE;
//
//@Service
//@RequiredArgsConstructor
//public class AzfTariffActivationServiceImpl implements AzfTariffActivationService {
//
//    private final NgbssAzerfonClient ngbssAzerfonClient;
//    private final TariffRepository tariffRepository;
//
//    @Override
//    public void activateTariffStatus(String phoneNumber, NumberTariffProjection numberTariffProjection) {
//        GenericResponse<SubscriberAzfPrimaryOfferResponse> offerResponse =
//                ngbssAzerfonClient.checkSubscriberByMsisdnV2(null, phoneNumber);
//
//        TariffEntity tariffEntity = tariffRepository.getById(numberTariffProjection.getTariffId());
//
//        if (offerResponse.getData() != null) {
//            if (TariffTypes.PO.equals(numberTariffProjection.getType())) {
//                PrimaryOfferingAzf primaryOffering = offerResponse.getData().getPrimaryOffering();
//                if (primaryOffering != null
//                        && primaryOffering.getOfferingId() != null
//                        && primaryOffering.getOfferingId().equals(numberTariffProjection.getExtId())
//                        && ACTIVE.getName().equals(primaryOffering.getStatus())
//                ) {
//                    List<SupplementaryOfferingDto> supplementaryOfferingList = offerResponse.getData().getSupplementaryOfferingList();
//                    if (supplementaryOfferingList != null) {
//                        Optional<SupplementaryOfferingDto> collect =
//                                supplementaryOfferingList.stream()
//                                        .filter(s -> s.getOfferingName().contains(primaryOffering.getOfferingName().toUpperCase()))
//                                        .findFirst();
//                        if (collect.isPresent()) {
//                            if (ACTIVE.equals(collect.get().getStatus())) {
//                                tariffEntity.setStatus(ACTIVE.getName());
//                            }
//                        } else {
//                            tariffEntity.setStatus(ACTIVE.getName());
//                        }
//                    } else {
//                        tariffEntity.setStatus(ACTIVE.getName());
//                    }
//                }
//                tariffRepository.save(tariffEntity);
//            } else {
//                List<SupplementaryOfferingDto> supplementaryOfferingList = offerResponse.getData().getSupplementaryOfferingList();
//
//                if (supplementaryOfferingList != null && supplementaryOfferingList.stream()
//                        .anyMatch(x -> x.getOfferingId().equals(numberTariffProjection.getExtId()) &&
//                                x.getStatus().equals(ACTIVE))) {
//                    tariffEntity.setStatus(ACTIVE.getName());
//                }
//                tariffRepository.save(tariffEntity);
//            }
//        }
//    }
//}

--------

package az.azerconnect.sales.salesprocess.service.impl;

import az.azerconnect.sales.salesprocess.clients.GenericResponse;
import az.azerconnect.sales.salesprocess.clients.ngbss.azerfon.NgbssAzerfonClient;
import az.azerconnect.sales.salesprocess.clients.ngbss.azerfon.model.response.PrimaryOfferingAzf;
import az.azerconnect.sales.salesprocess.clients.ngbss.azerfon.model.response.SubscriberAzfPrimaryOfferResponse;
import az.azerconnect.sales.salesprocess.constants.types.TariffTypes;
import az.azerconnect.sales.salesprocess.dto.response.SupplementaryOfferingDto;
import az.azerconnect.sales.salesprocess.entity.ChangeOfferEntity;
import az.azerconnect.sales.salesprocess.entity.TariffEntity;
import az.azerconnect.sales.salesprocess.projection.NumberTariffProjection;
import az.azerconnect.sales.salesprocess.repository.ChangeOfferRepository;
import az.azerconnect.sales.salesprocess.repository.TariffRepository;
import az.azerconnect.sales.salesprocess.service.AzfTariffActivationService;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Objects;
import java.util.Optional;

import static az.azerconnect.sales.salesprocess.constants.OfferingStatus.ACTIVE;
import static az.azerconnect.sales.salesprocess.constants.ScheduleConstants.NEW_NUMBER_SALE;

@Service
@RequiredArgsConstructor
public class AzfTariffActivationServiceImpl2 implements AzfTariffActivationService {

    private final NgbssAzerfonClient ngbssAzerfonClient;
    private final TariffRepository tariffRepository;
    private final ChangeOfferRepository changeOfferRepository;

    @Override
    public void activateTariffStatus(String phoneNumber, NumberTariffProjection numberTariffProjection) {
        GenericResponse<SubscriberAzfPrimaryOfferResponse> offerResponse =
                ngbssAzerfonClient.checkSubscriberByMsisdnV2(null, phoneNumber);

        if (NEW_NUMBER_SALE.equals(numberTariffProjection.getOperationType())) {
            processTariffActivation(tariffRepository.getById(numberTariffProjection.getTariffId()),
                    offerResponse, numberTariffProjection);
        } else {
            processTariffActivation(changeOfferRepository.findById(Long.valueOf(numberTariffProjection
                    .getTariffId())).get(), offerResponse, numberTariffProjection);
        }
    }

    private void processTariffActivation(Object entity,
                                         GenericResponse<SubscriberAzfPrimaryOfferResponse> offerResponse,
                                         NumberTariffProjection numberTariffProjection) {
        if (Objects.isNull(offerResponse.getData())) {
            return;
        }

        if (TariffTypes.PO.equals(numberTariffProjection.getType())) {
            processPrimaryOfferingActivation(entity, offerResponse.getData().getPrimaryOffering(),
                    offerResponse.getData().getSupplementaryOfferingList(), numberTariffProjection);
        } else {
            processSupplementaryOfferingActivation(entity, offerResponse.getData().getSupplementaryOfferingList(),
                    numberTariffProjection);
        }

        if (entity instanceof TariffEntity) {
            tariffRepository.save((TariffEntity) entity);
        } else if (entity instanceof ChangeOfferEntity) {
            changeOfferRepository.save((ChangeOfferEntity) entity);
        }
    }

    private void processPrimaryOfferingActivation(Object entity, PrimaryOfferingAzf primaryOffering,
                                                  List<SupplementaryOfferingDto> supplementaryOfferings,
                                                  NumberTariffProjection numberTariffProjection) {
        if (primaryOffering != null && primaryOffering.getOfferingId() != null
                && primaryOffering.getOfferingId().equals(numberTariffProjection.getExtId())
                && ACTIVE.getName().equals(primaryOffering.getStatus())) {

            Optional.ofNullable(supplementaryOfferings)
                    .ifPresentOrElse((supplementaryOfferingsList) -> {
                        Optional<SupplementaryOfferingDto> collect = supplementaryOfferingsList.stream()
                                .filter(s -> s.getOfferingName()
                                        .contains(primaryOffering.getOfferingName().toUpperCase()))
                                .findFirst();
                        if (collect.isPresent() && ACTIVE.equals(collect.get().getStatus())) {
                            setActivationStatus(entity, ACTIVE.getName());
                        }
                    }, () -> {
                        if (ACTIVE.name().equals(primaryOffering.getStatus())) {
                            setActivationStatus(entity, ACTIVE.getName());
                        }
                    });
        }
    }

    private void processSupplementaryOfferingActivation(Object entity,
                                                        List<SupplementaryOfferingDto> supplementaryOfferings,
                                                        NumberTariffProjection numberTariffProjection) {
        if (supplementaryOfferings != null && supplementaryOfferings.stream()
                .anyMatch(so -> so.getOfferingId().equals(numberTariffProjection.getExtId()) &&
                        so.getStatus().equals(ACTIVE))) {
            setActivationStatus(entity, ACTIVE.getName());
        }
    }

    private void setActivationStatus(Object entity, String status) {
        if (entity instanceof TariffEntity) {
            ((TariffEntity) entity).setStatus(status);
        } else if (entity instanceof ChangeOfferEntity) {
            ((ChangeOfferEntity) entity).setActivateStatus(status);
        }
    }

}


--------------------------------------------------------------------------------------------------------------------------------

//package az.azerconnect.sales.salesprocess.service.impl;
//
//import az.azerconnect.sales.salesprocess.clients.GenericResponse;
//import az.azerconnect.sales.salesprocess.clients.ngbss.bakcell.NgbssBakcellClient;
//import az.azerconnect.sales.salesprocess.clients.ngbss.bakcell.model.SubscriberInfoResponse;
//import az.azerconnect.sales.salesprocess.clients.ngbss.bakcell.model.SupplementaryOfferOutput;
//import az.azerconnect.sales.salesprocess.constants.types.TariffTypes;
//import az.azerconnect.sales.salesprocess.entity.TariffEntity;
//import az.azerconnect.sales.salesprocess.projection.NumberTariffProjection;
//import az.azerconnect.sales.salesprocess.repository.TariffRepository;
//import az.azerconnect.sales.salesprocess.service.BkcTariffActivationService;
//import lombok.RequiredArgsConstructor;
//import org.springframework.stereotype.Service;
//
//import java.util.List;
//import java.util.Optional;
//
//import static az.azerconnect.sales.salesprocess.constants.OfferingStatus.ACTIVE;
//
//@Service
//@RequiredArgsConstructor
//public class BkcTariffActivationServiceImpl implements BkcTariffActivationService {
//
//    private final NgbssBakcellClient bakcellClient;
//    private final TariffRepository tariffRepository;
//
//    @Override
//    public void activateTariffStatus(String phoneNumber, NumberTariffProjection numberTariffProjection) {
//        TariffEntity tariffEntity = tariffRepository.getById(numberTariffProjection.getTariffId());
//
//        if (TariffTypes.PO.equals(numberTariffProjection.getType())) {
//            GenericResponse<SubscriberInfoResponse> subscriberInfoResponseGenericResponse = bakcellClient.checkSubscriberByMSISDN(null, phoneNumber);
//            SubscriberInfoResponse data = subscriberInfoResponseGenericResponse.getData();
//            if (data != null && data.getPrimaryOffering() != null
//                    && data.getPrimaryOffering().getOfferingId() != null
//                    && data.getPrimaryOffering().getOfferingId().equals(numberTariffProjection.getExtId())
//                    && ACTIVE.getName().equals(data.getPrimaryOffering().getStatus())
//            ) {
//                tariffEntity.setStatus(ACTIVE.getName());
//                tariffRepository.save(tariffEntity);
//            }
//        } else {
//            GenericResponse<List<SupplementaryOfferOutput>> supplementOfferByMsisdn = bakcellClient.getSupplementOfferByMsisdn(phoneNumber);
//            if (supplementOfferByMsisdn.getData() != null) {
//                Optional<SupplementaryOfferOutput> first = supplementOfferByMsisdn.getData()
//                        .stream()
//                        .filter(x -> x.getNgbssId().equals(numberTariffProjection.getExtId()))
//                        .findFirst();
//                if (first.isPresent() && ACTIVE.getName().equals(first.get().getStatus())) {
//                    tariffEntity.setStatus(ACTIVE.getName());
//                    tariffRepository.save(tariffEntity);
//                }
//            }
//        }
//    }
//}


----------

package az.azerconnect.sales.salesprocess.service.impl;

import az.azerconnect.sales.salesprocess.clients.GenericResponse;
import az.azerconnect.sales.salesprocess.clients.ngbss.bakcell.NgbssBakcellClient;
import az.azerconnect.sales.salesprocess.clients.ngbss.bakcell.model.PrimaryOfferingBkc;
import az.azerconnect.sales.salesprocess.clients.ngbss.bakcell.model.SubscriberInfoResponse;
import az.azerconnect.sales.salesprocess.clients.ngbss.bakcell.model.SupplementaryOfferOutput;
import az.azerconnect.sales.salesprocess.constants.types.TariffTypes;
import az.azerconnect.sales.salesprocess.entity.ChangeOfferEntity;
import az.azerconnect.sales.salesprocess.entity.TariffEntity;
import az.azerconnect.sales.salesprocess.projection.NumberTariffProjection;
import az.azerconnect.sales.salesprocess.repository.ChangeOfferRepository;
import az.azerconnect.sales.salesprocess.repository.TariffRepository;
import az.azerconnect.sales.salesprocess.service.BkcTariffActivationService;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Objects;
import java.util.Optional;

import static az.azerconnect.sales.salesprocess.constants.OfferingStatus.ACTIVE;
import static az.azerconnect.sales.salesprocess.constants.ScheduleConstants.NEW_NUMBER_SALE;

@Service
@RequiredArgsConstructor
public class BkcTariffActivationServiceImpl2 implements BkcTariffActivationService {

    private final NgbssBakcellClient bakcellClient;
    private final TariffRepository tariffRepository;
    private final ChangeOfferRepository changeOfferRepository;

    @Override
    public void activateTariffStatus(String phoneNumber, NumberTariffProjection numberTariffProjection) {
        GenericResponse<SubscriberInfoResponse> offerResponse =
                bakcellClient.checkSubscriberByMSISDN(null, phoneNumber);

        if (NEW_NUMBER_SALE.equals(numberTariffProjection.getOperationType())) {
            proceedPrimaryOffering(tariffRepository.getById(numberTariffProjection.getTariffId()),
                    offerResponse, numberTariffProjection, phoneNumber);
        } else {
            proceedPrimaryOffering(changeOfferRepository.findById(
                            Long.valueOf(numberTariffProjection.getTariffId()))
                    .get(), offerResponse, numberTariffProjection, phoneNumber);
        }
    }

    private void proceedPrimaryOffering(Object entity, GenericResponse<SubscriberInfoResponse> offerResponse,
                                        NumberTariffProjection numberTariffProjection, String phoneNumber) {
        GenericResponse<List<SupplementaryOfferOutput>> supplementOfferByMsisdn =
                bakcellClient.getSupplementOfferByMsisdn(phoneNumber);
        if (Objects.isNull(offerResponse.getData())) {
            return;
        }
        if (TariffTypes.PO.equals(numberTariffProjection.getType())) {
            processPrimaryOfferingActivation(entity, offerResponse.getData().getPrimaryOffering(),
                    numberTariffProjection);
        } else {
            processSupplementaryOfferingActivation(entity, supplementOfferByMsisdn, numberTariffProjection);
        }

        if (entity instanceof TariffEntity) {
            tariffRepository.save((TariffEntity) entity);
        } else if (entity instanceof ChangeOfferEntity) {
            changeOfferRepository.save((ChangeOfferEntity) entity);
        }
    }

    private void processPrimaryOfferingActivation(Object entity, PrimaryOfferingBkc primaryOffering,
                                                  NumberTariffProjection numberTariffProjection) {
        if (Objects.nonNull(primaryOffering)
                && Objects.equals(primaryOffering.getOfferingId(), numberTariffProjection.getExtId())
                && ACTIVE.getName().equals(primaryOffering.getStatus())) {
            setActivationStatus(entity, ACTIVE.getName());
        }
    }

    private void processSupplementaryOfferingActivation(
            Object entity,
            GenericResponse<List<SupplementaryOfferOutput>> supplementOfferByMsisdn,
            NumberTariffProjection numberTariffProjection) {

        Optional.ofNullable(supplementOfferByMsisdn.getData())
                .map(data -> data.stream()
                        .filter(so -> Objects.equals(so.getNgbssId(), numberTariffProjection.getExtId()))
                        .findFirst())
                .filter(found -> found.isPresent() && ACTIVE.getName().equals(found.get().getStatus()))
                .ifPresent(result -> setActivationStatus(entity, ACTIVE.getName()));
    }

    private void setActivationStatus(Object entity, String status) {
        if (entity instanceof TariffEntity) {
            ((TariffEntity) entity).setStatus(status);
        } else if (entity instanceof ChangeOfferEntity) {
            ((ChangeOfferEntity) entity).setActivateStatus(status);
        }
    }

}










 

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