delete Lists.newArrayList()

OfficeServiceImpl.java

package org.jazzteam.fitnesclub.service.impl;

import com.google.common.collect.Lists;
import lombok.Builder;
import org.jazzteam.fitnesclub.dto.OfficeDto;
import org.jazzteam.fitnesclub.dto.RoomDto;

import org.jazzteam.fitnesclub.model.Office;
import org.jazzteam.fitnesclub.model.Room;
import org.jazzteam.fitnesclub.repository.OfficeRepository;
import org.jazzteam.fitnesclub.repository.RoomRepository;
import org.jazzteam.fitnesclub.repository.addictional.FitnessCategoryRepository;
import org.jazzteam.fitnesclub.repository.addictional.InventoryRepository;
import org.jazzteam.fitnesclub.repository.addictional.impl.FitnessCategoryRepositoryImpl;
import org.jazzteam.fitnesclub.repository.addictional.impl.InventoryRepositoryImpl;
import org.jazzteam.fitnesclub.repository.impl.OfficeRepositoryImpl;
import org.jazzteam.fitnesclub.repository.impl.RoomRepositoryImpl;
import org.jazzteam.fitnesclub.service.OfficeService;
import org.jazzteam.fitnesclub.validators.RoomValidator;

import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;

@Builder
public class OfficeServiceImpl implements OfficeService {
    private final OfficeRepository officeRepository = new OfficeRepositoryImpl();
    private final RoomValidator roomValidator;
    private final RoomRepository roomRepository = new RoomRepositoryImpl();
    private final FitnessCategoryRepository fitnessCategoryRepository = new FitnessCategoryRepositoryImpl();
    private final InventoryRepository inventoryRepository = new InventoryRepositoryImpl();

    @Override
    public Office addOffice(OfficeDto officeDto) {
        Office office = new Office();
        office.setAddress(officeDto.getAddress());
        return officeRepository.save(office);
    }

    @Override
    public Office updateOffice(OfficeDto officeDto) {
        Office office = officeRepository.findById(officeDto.getId());
        office.setAddress(officeDto.getAddress());
        return officeRepository.save(office);
    }

    @Override
    public void deleteOffice(OfficeDto officeDto) {
        Office officeToDelete = officeRepository.findById(officeDto.getId());
        officeRepository.delete(officeToDelete);
    }

    @Override
    public Room addRoom(RoomDto roomDto, Long officeId) {
        Room room = new Room();
        addFitnessCategoriesToRoom(roomDto, room);
        // TODO: 20.08.2021 validate that inventories in db enough to add in room
        addInventoryToRoom(roomDto, room);
        Office officeFromDb = officeRepository.findById(officeId);
        room.setOffice(officeFromDb);
        return roomRepository.save(room);
    }


    @Override
    public Room updateRoom(RoomDto roomDto) {
        Room room = roomRepository.findById(roomDto.getId());

        addFitnessCategoriesToRoom(roomDto, room);
        // TODO: 20.08.2021 validate that inventories in db enough to add in room
        addInventoryToRoom(roomDto, room);
        return roomRepository.save(room);
    }

    @Override
    public void deleteRoom(RoomDto roomDto) {
        Room roomToDelete = roomRepository.findById(roomDto.getId());
        roomRepository.delete(roomToDelete);
    }

    @Override
    public List<Office> findAllOffices(Predicate<Office> predicate) {
        return officeRepository.findAll(predicate);
    }

    @Override
    public List<Room> findAllRooms(Predicate<Room> predicate) {
        return roomRepository.findAll(predicate);
    }

    private void addFitnessCategoriesToRoom(RoomDto roomDto, Room room) {
        room.getFitnessCategories().addAll(
                roomDto.getFitnessCategories().stream()
                        .map(fitnessDto -> fitnessCategoryRepository.findById(fitnessDto.getId()))
                        .collect(Collectors.toList()));
    }

    private void addInventoryToRoom(RoomDto roomDto, Room room) {
        room.getInventories().addAll(roomDto.getInventories().stream()
                .map(inventoryDto -> inventoryRepository.findById(inventoryDto.getId()))
                .collect(Collectors.toList()));
    }
}