public PromoPackage(Book book1, Book book2, int discountAmount, DiscountType discountType)
{
this.book1 = book1;
this.book2 = book2;
this.discountAmount = discountAmount;
this.discountType = discountType;
}
/// <summary>
/// Gets the number of books in the inventory.
/// </summary>
/// <param name="book"></param>
/// <returns></returns>
public static int CountBooks(Book book)
{
if (!books.ContainsKey(book))
{
return 0;
}
return books[book];
}
public void AddBook(int amount, Book book)
{
int currentAmount = 0;
if (contents.ContainsKey(book))
{
currentAmount = contents[book];
}
currentAmount += amount;
contents[book] = currentAmount;
}
public static void AddBook(Book book, int amount)
{
if (!books.ContainsKey(book))
{
books.Add(book, 0);
}
int currentAmount = books[book];
currentAmount += amount;
books[book] = currentAmount;
}
/// <summary>
/// Deducts the amount given for the specified book in the inventory.
/// </summary>
/// <param name="book"></param>
/// <param name="amount"></param>
public static void DeductInventory(Book book, int amount)
{
int stock = books[book];
if (stock - amount < 0)
{
throw new ArgumentException("Not enough books in stock: current stock is " + stock + ", trying to deduct " +
amount);
}
stock -= amount;
books[book] = stock;
}
public int GetAmount(Book book)
{
return contents[book];
}
public bool ContainsBook(Book book)
{
return contents.ContainsKey(book);
}