public static Borrowing Issue(Patron patron, BorrowableItem item)
{
Borrowing ret = null;
if (item.BorrowedBy != null)
throw new BookBorrowedException();
ret = new Borrowing(patron, item);
item.BorrowedBy = ret;
patron.BorrowedBooks.Add(ret);
return ret;
}
public void BorrowBook(Patron patron, BorrowableItem book)
{
try
{
Borrowing b = Borrowing.Issue(patron, book);
_RecordOfBorrowings.Add(book.Title, b);
}
catch (BookBorrowedException e)
{
Console.WriteLine(e.Message);
}
catch (InvalidBorrowException e)
{
Console.WriteLine(e.Message);
}
catch (IssueBookException e)
{
Console.WriteLine(e.Message);
}
}
private Borrowing(Patron patron, BorrowableItem item)
{
_Item = item;
_Patron = patron;
_DueDate = patron.GetDueDate();
}