public static ModelStore LoadFrom(TextReader reader)
{
var store = new ModelStore();
try
{
if (reader.ReadLine() != "DATA-BEGIN")
{
return(null);
}
while (true)
{
string line = reader.ReadLine();
if (line == null)
{
return(null);
}
else if (line == "DATA-END")
{
break;
}
string[] tokens = line.Split(';');
switch (tokens[0])
{
case "BOOK":
{
int id = int.Parse(tokens[1]);
string title = tokens[2];
string author = tokens[3];
decimal price = decimal.Parse(tokens[4]);
if ((id < 0) || (price < 0))
{
return(null);
}
store.books.Add(new Book
{
Id = id,
Title = title,
Author = author,
Price = price
});
}
break;
case "CUSTOMER":
{
int id = int.Parse(tokens[1]);
if (id < 0)
{
return(null);
}
store.customers.Add(new Customer
{
Id = id,
FirstName = tokens[2],
LastName = tokens[3]
});
}
break;
case "CART-ITEM":
var customer = store.GetCustomer(int.Parse(tokens[1]));
int bookId = int.Parse(tokens[2]);
int count = int.Parse(tokens[3]);
var book = store.GetBook(bookId);
if (customer == null || book == null || count < 1)
{
return(null);
}
customer.ShoppingCart.Items.Add(new ShoppingCartItem
{
BookId = bookId,
Count = count
});
break;
default:
return(null);
}
}
}
catch (Exception ex)
{
if (ex is FormatException || ex is IndexOutOfRangeException)
{
return(null);
}
throw;
}
return(store);
}
public void ProcessCommand(string command)
{
try
{
string[] splitedCommand = command.Split(' ');
{
if (splitedCommand[0] != "GET")
{
InvalidCommand();
return;
}
//Checks if customer exists
int customerId = int.Parse(splitedCommand[1]);
if (modelStore.GetCustomer(customerId) == null)
{
InvalidCommand();
return;
}
if (splitedCommand[2].StartsWith("http://www.nezarka.net/"))
{
splitedCommand[2] = splitedCommand[2].Remove(0, 23);
}
else
{
InvalidCommand();
return;
}
string[] splitedShortCommand = splitedCommand[2].Split('/');
switch (splitedShortCommand[0])
{
case "Books":
{
if (splitedShortCommand.Length == 1)
{
ShowBooks(customerId);
return;
}
if (splitedShortCommand.Length == 3)
{
int bookId = int.Parse(splitedShortCommand[2]);
if (modelStore.GetBook(bookId) == null)
{
InvalidCommand();
return;
}
else
{
if (splitedShortCommand[1] == "Detail")
{
ShowBookDetail(customerId, bookId);
return;
}
}
}
InvalidCommand();
return;
}
case "ShoppingCart":
{
if (splitedShortCommand.Length == 1)
{
ShowShoppingCart(customerId);
return;
}
if (splitedShortCommand.Length == 3)
{
int bookId = int.Parse(splitedShortCommand[2]);
if (modelStore.GetBook(bookId) == null)
{
InvalidCommand();
return;
}
else
{
if (splitedShortCommand[1] == "Add")
{
AddToCart(customerId, bookId);
return;
}
if (splitedShortCommand[1] == "Remove")
{
RemoveFromCart(customerId, bookId);
return;
}
}
InvalidCommand();
return;
}
InvalidCommand();
return;
}
default:
InvalidCommand();
return;
}
}
}
catch (Exception ex)
{
if (ex is FormatException || ex is IndexOutOfRangeException)
{
InvalidCommand();
return;
}
throw;
}
}
public void ShowBooks(int customerId)
{
new PageBooks(modelStore.GetCustomer(customerId), modelStore.GetBooks()).Print();
}