@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((amount == null) ? 0 : amount.hashCode());
result = prime * result + ((product == null) ? 0 : product.hashCode());
result = prime * result + quantity;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
OrderItem other = (OrderItem) obj;
if (amount == null) {
if (other.amount != null) return false;
} else if (!amount.equals(other.amount)) return false;
if (product == null) {
if (other.product != null) return false;
} else if (!product.equals(other.product)) return false;
if (quantity != other.quantity) return false;
return true;
}
public BigDecimal computeAmount() {
this.amount = product.getPrice().multiply(new BigDecimal(quantity));
return this.amount;
}