public static AbstractDiscount GetStrategyFor(Book book){
if(book.PublishedYear > 5)
return new MaxDiscount();
if (book.PublishedYear > 3)
return new MediumYearDiscount();
if (book.PublishedYear > 1)
return new MinYearDiscount();
return new NullDiscount();
}
private List<Book> LoadBooks(XmlNodeList nodes) {
var books = new List<Book>();
if (nodes == null)
return books;
foreach (XmlNode node in nodes) {
var book = new Book();
book.ISBN = GetValueFor(node, BookProperties.ISBN);
book.Title = GetValueFor(node, BookProperties.Title);
book.Price = GetNumValueFor(node, BookProperties.Price);
book.PublishedYear = GetIntValueFor(node, BookProperties.PublishedYear);
book.Authors = LoadAuthors(node);
books.Add(book);
}
return books;
}
public void Apply(Book book){
book.Price -= Discount/100*book.Price;
}
