public static List<Book> getAll(string aId)
{
List<BookDTO> dtoList = null; ;
// This method retrieves a list of all books in the library system
if (string.IsNullOrEmpty(aId))
{
dtoList = LibraryDataAccess.getAllBooksDAL(); //BookDTO is the interface common for BL and DAL
}
else
{
//Fetch the correct AuthorDTO object and connect an Author object for it
AuthorDTO dto = LibraryDataAccess.loadAuthorDAL(Convert.ToInt32(aId));
dto.loadStatus = LoadStatus.Ghost; //Force it to load all data
Author AuthorObject = new Author(dto);
// Use the author objects IsbnList property
dtoList = LibraryDataAccess.getAllAuthorBookDAL(AuthorObject.IsbnList);
}
// Convert to Book objects since UI only references BL (not DAL or DTO)
List<Book> results = new List<Book>();
foreach (BookDTO dto in dtoList)
{
Book item = new Book(dto);
results.Add(item);
}
return results;
}
public static List<Author> getAll()
{
// This method retrieves a list of all authors in the library system
List<AuthorDTO> dtoList = LibraryDataAccess.getAllAuthorsDAL(); //AuthorDTO is the interface common for BL and DAL
// Convert to Author objects
List<Author> results = new List<Author>();
foreach(AuthorDTO dto in dtoList)
{
Author item = new Author(dto);
results.Add(item);
}
return results;
}