class Product {
public string ProductNumber { get; }
public Manufacturer Manufacturer { get; }
public string Description { get; private set; }
public Product(string productNumber, Manufacturer manufacturer, string description) {
ProductNumber = productNumber ?? throw new ArgumentNullException(nameof(productNumber));
Manufacturer = manufacturer ?? throw new ArgumentNullException(nameof(manufacturer));
Description = description ?? throw new ArgumentNullException(nameof(description));
}
}
class Manufacturer {
public string ManufacturerNumber { get; }
public string Name { get; private set; }
public Manufacturer(string manufacturerNumber, string name) {
ManufacturerNumber = manufacturerNumber ?? throw new ArgumentNullException(nameof(manufacturerNumber));
Name = name ?? throw new ArgumentNullException(nameof(name));
}
}
public class ProductDTO {
public string ProductNumber { get; set; }
public ManufacturerDTO Manufacturer { get; set; }
public string Description { get; set; }
}
public class ManufacturerDTO {
public string ManufacturerNumber { get; set; }
public string Name { get; set; }
}
class ProductFactory {
private DbContext dbContext;
public ProductFactory(DbContext dbContext) {
this.dbContext = dbContext;
}
public Product CreateProduct(ProductDTO productDto) {
if (dbContext == null) throw new InvalidOperationException($"{nameof(dbContext)} must not be null");
if (productDto == null) throw new ArgumentNullException(nameof(productDto));
if (productDto.Manufacturer == null) throw new ArgumentException($"{nameof(Product)}.{nameof(productDto.Manufacturer)} must not be null");
Manufacturer manufacturer = GetManufacturer(productDto.Manufacturer);
Product product = new Product(productDto.ProductNumber, manufacturer, productDto.Description);
return product;
}
private Manufacturer GetManufacturer(ManufacturerDTO manufacturerDto) {
Manufacturer manufacturer =
ExistManufacturer(manufacturerDto.ManufacturerNumber)
? LoadManufacturer(manufacturerDto.ManufacturerNumber)
: CreateManufacturer(manufacturerDto);
return manufacturer;
}
private bool ExistManufacturer(string manufacturerNumber) {
return dbContext.Manufacturers.Local.Any(x => x.ManufacturerNumber == manufacturerNumber)
|| dbContext.Manufacturers.Any(x => x.ManufacturerNumber == manufacturerNumber);
}
private Manufacturer LoadManufacturer(string manufacturerNumber) {
return dbContext.Manufacturers.Local.SingleOrDefault(x => x.ManufacturerNumber == manufacturerNumber)
?? dbContext.Manufacturers.Single(x => x.ManufacturerNumber == manufacturerNumber);
}
private Manufacturer CreateManufacturer(ManufacturerDTO manufacturerDto) {
Manufacturer manufacturer = new Manufacturer(manufacturerDto.ManufacturerNumber, manufacturerDto.Name);
dbContext.Manufacturers.Add(manufacturer);
return manufacturer;
}
}
public class Program
{
public static void Main()
{
DbContext dbContext = new DbContext();
ProductFactory productFactory = new ProductFactory(dbContext);
for (int i = 0; i < 10; ++i)
{
ProductDTO productDto = ReadProduct(i);
Product product = productFactory.CreateProduct(productDto);
dbContext.Products.Add(product);
}
dbContext.SaveChanges();
}
private static ProductDTO ReadProduct(int i) {
ProductDTO productDto = new ProductDTO()
{
ProductNumber = "P" + i.ToString("0000"),
Manufacturer = new ManufacturerDTO()
{
ManufacturerNumber = "1234",
Name = "Default Manufacturer"
},
Description = "Default Description for product"
};
return productDto;
}
}
