public Seller(Seller other) {
this.name = other.name;
this.product = new Product(other.product);
this.minPrice = other.minPrice;
this.strategy = other.getStrategy();
this.decrement = other.getDecrement();
}
public static boolean isValid(Seller seller) {
return (seller.getName() != null
&& !seller.getName().isEmpty()
&& Product.isValid(seller.getProduct())
&& seller.decrement.compareTo(BigDecimal.ZERO) == 1
&& seller.minPrice.compareTo(BigDecimal.ZERO) == 1);
}