public OrderStatus buy(int aItemId, int quantity) throws UnknownArticleException {
Item orderedItem = stockDao.getItem(aItemId);
if (orderedItem == null) {
throw new UnknownArticleException();
}
if (stockDao.addOrder(orderedItem, quantity)) {
return new OrderStatus(orderedItem, ++orderId);
} else {
return new OrderStatus(orderedItem);
}
}
public List listStock() {
return stockDao.getCurrentStock();
}