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public class WebPurchaseService {
 @Autowired PurchaseDao purchaseDao;
 @Autowired PurchaseValidator purchaseValidator;

 public PurchaseConfirmation executePurchase(Purchase purchase) {
    if (!purchaseValidator.validate(purchase)) {
       throw new PurchaseException("НеверныйIncorrect заказorder", purchase);
    }
    purchaseDao.save(purchase);
    return new PurchaseConfirmation( purchase );
 }
}