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Library providing generic classes and implementation for basic CRUD operations

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package com.cleverpine.cpspringdatacrud.service.impl;

import com.cleverpine.cpspringdatacrud.mapper.BusinessLayerMapper;
import com.cleverpine.cpspringdatacrud.repository.CommonRepository;
import com.cleverpine.cpspringdatacrud.service.contract.CRUDService;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import javax.persistence.EntityNotFoundException;
import java.util.List;
import java.util.stream.Collectors;

@Service
@RequiredArgsConstructor
public abstract class CRUDServiceImpl implements CRUDService {

    public static final String ENTITY_NOT_FOUND_ERROR_MESSAGE = "Could not find %s with id: [%s]";

    private final CommonRepository repository;
    private final BusinessLayerMapper mapper;
    private final Class entityClass;

    @Override
    public BusinessLayerDTO get(EntityId id) {
        return mapper.entityToBusinessLayerDTO(this.findById(id));
    }

    @Override
    public List getAll() {
        return repository.findAll()
                .stream()
                .map(mapper::entityToBusinessLayerDTO)
                .collect(Collectors.toList());
    }

    @Override
    public BusinessLayerDTO update(EntityId id, BusinessLayerDTO businessLayerDto) {
        var updatedEntity = mapper.businessLayerDTOToEntity(this.findById(id), businessLayerDto);
        repository.save(updatedEntity);
        return mapper.entityToBusinessLayerDTO(updatedEntity);
    }

    @Override
    public BusinessLayerDTO create(BusinessLayerDTO businessLayerDto) {
        var entity = mapper.businessLayerDTOToEntity(businessLayerDto);
        repository.save(entity);
        return mapper.entityToBusinessLayerDTO(entity);
    }

    @Override
    public void delete(EntityId id) {
        this.findById(id);
        repository.deleteById(id);
    }

    protected Entity findById(EntityId id) {
        return repository.findById(id)
                .orElseThrow(() -> new EntityNotFoundException(
                        String.format(ENTITY_NOT_FOUND_ERROR_MESSAGE, entityClass.getSimpleName(), id)));
    }
}