public void AddProduct(Product product)
{
Contract.Requires(Stock != null);
Contract.Requires(product != null);
Contract.Requires(product.Ammount > 0, "PRE: Added ammount must be > 0");
Contract.Ensures(Contract.Exists(Stock, p => (string)p.Element("Name") == product.Name && (int)p.Element("Price") == product.Price), "POST: The added item must be in Stock");
Contract.Ensures(Contract.OldValue((int)Stock.Where(el => (string)el.Element("Name") == product.Name).Single().Element("Ammount")) + product.Ammount ==
(int)Stock.Where(el => (string)el.Element("Name") == product.Name).Single().Element("Ammount"),
"POST: The ammount of items has to be added");
if (CheckAvailability(product))
{
XElement node = Stock.Where(el => (string)el.Element("Name") == product.Name).Single();
node.Element("Ammount").Value = ((int)node.Element("Ammount") + product.Ammount).ToString();
node.Element("Price").Value = product.Price.ToString();
}
else
{
Stock.Last().AddAfterSelf(new XElement("Product", new XElement("Name", product.Name), new XElement("Price", product.Price), new XElement("Ammount", product.Ammount)));
}
Database.Save("StockDatabase.xml");
}
public bool CheckAvailability(Product product)
{
Contract.Requires(Stock != null);
Contract.Requires(product != null);
return Stock.Any(p => (string)p.Element("Name") == product.Name && (int)p.Element("Ammount") > 0);
}
private void faxeB_Click(object sender, EventArgs e)
{
Product prod = new Product("faxe");
machine.SelectProduct(prod);
// update disp
decimal valueToBeInserted = machine.SelectedProduct.Price - machine.InsertedValue;
dispL.Text = prepareDisp(valueToBeInserted);
purchaseB.Enabled = true;
}
public void EjectProduct(Product product, LinkedList<Product> productCase)
{
Contract.Requires(CheckAvailability(product), "PRE: Sought item must be in stock");
Contract.Requires(Stock != null);
Contract.Requires(productCase != null);
Contract.Requires(product != null);
Contract.Ensures(productCase.Contains(product), "POST: Sought item must be ejected");
Contract.Ensures(Contract.OldValue((int)Stock.Where(el => (string)el.Element("Name") == product.Name).Single().Element("Ammount")) - 1 ==
(int)Stock.Where(el => (string)el.Element("Name") == product.Name).Single().Element("Ammount"));
XElement node = Stock.Where(el => (string)el.Element("Name") == product.Name).Single();
node.Element("Ammount").Value = ((int)node.Element("Ammount") - 1).ToString();
productCase.AddLast(new Product(product.Name,1,product.Price));
Database.Save("StockDatabase.xml");
}
public decimal GetPrice(Product product)
{
Contract.Requires(Contract.Exists(Stock, p => (string)p.Element("Name") == product.Name), "PRE: Sought item must be known");
Contract.Requires(Stock != null);
Contract.Requires(product != null);
return (decimal)Stock.Where(p => (string)p.Element("Name") == product.Name).Select(p => p.Element("Price")).First();
}
internal void AddProduct([PexAssumeUnderTest]StockManager target, Product product)
{
target.AddProduct(product);
}
public static Product Create(string name, int amm, decimal price)
{
Product prod = new Product(name, amm, price);
return prod;
}
public TransactionResult SelectProduct(Product product)
{
Contract.Requires(state == State.Idle || state == State.ProductChosen);
if(StockMan.CheckAvailability(product))
{
SelectedProduct = product;
SelectedProduct.Price = StockMan.GetPrice(SelectedProduct);
state = State.ProductChosen;
return TransactionResult.Success;
}
return TransactionResult.OutOfStock;
}
public TransactionResult CheckProduct(Product product)
{
if (StockMan.CheckAvailability(product))
{
return TransactionResult.Success;
}
return TransactionResult.OutOfStock;
}
