/// <summary>
/// Get an EditBookViewModel object from given isbn.
/// If no book can be found, return an empty EditBookViewModel.
/// </summary>
/// <remarks>
/// Does not fill out the Copies property!
/// </remarks>
/// <param name="isbn">ISBN as a string.</param>
/// <returns>EditBookViewModel</returns>
/// <exception cref="Services.Exceptions.DoesNotExistException">
/// Thrown when a book or its authors could not be found.</exception>
/// <exception cref="Services.Exceptions.DataAccessException">
/// Thrown when an error occurs in the data access layer.</exception>
public static EditBookViewModel GetEditBookViewModel(string isbn)
{
EditBookViewModel ebvm = new EditBookViewModel();
Book book = new Book();
if (!Book.GetBook(out book, isbn))
throw new DataAccessException("Ett oväntat fel uppstod när en bok skulle hämtas.");
if (book == null)
throw new DoesNotExistException("Ajdå! Boken hittades inte.");
var bookAuthors = new List<BookAuthor>();
if (!BookAuthor.GetBookAuthors(out bookAuthors, book.ISBN))
throw new DataAccessException("Ett oväntat fel uppstod när författare till en bok skulle hämtas.");
if (bookAuthors.Count < 1)
throw new DoesNotExistException("Mystiskt! Angivna författare kunde inte hittas.");
var authorIds = new List<int>();
foreach (BookAuthor ba in bookAuthors)
authorIds.Add(ba.Aid);
ebvm = Mapper.Map<EditBookViewModel>(book);
ebvm.AuthorIds = authorIds;
return ebvm;
}
public ActionResult Book(EditBookViewModel bookInfo)
{
string err = setBookViewLists(bookInfo);
bool upsertSuccess = false;
if (err != null)
ViewBag.error = err + "\n";
if (ModelState.IsValid)
{
try
{
BookServices.Upsert(bookInfo, bookInfo.Update);
bookInfo.Update = true;
upsertSuccess = true;
}
catch (AlreadyExistsException e) { ViewBag.error += e.Message; }
catch (DoesNotExistException e) { ViewBag.error += e.Message; }
catch (DataAccessException e) { ViewBag.error += e.Message; }
catch (Exception) { ViewBag.error += "Oväntat fel."; }
}
if(!upsertSuccess)
return View(bookInfo);
else
return RedirectToAction("Book", "Search", new { search = bookInfo.ISBN});
}
public ActionResult Book(string isbn)
{
var errors = new List<string>();
var bookInfo = new EditBookViewModel();
if (isbn != null)
{
try
{
bookInfo = BookServices.GetEditBookViewModel(isbn);
bookInfo.Update = true;
}
catch (DoesNotExistException e) { errors.Add(e.Message); }
catch (AlreadyExistsException e) { errors.Add(e.Message); }
catch (DataAccessException e) { errors.Add(e.Message); }
}
string err = setBookViewLists(bookInfo);
if (err != null)
errors.Add(err);
if (errors.Count > 0)
ViewBag.error = errors;
return View(bookInfo);
}
/// <summary>
/// Write a book to the database.
/// </summary>
/// <param name="editBookViewModel">The EditBookViewModel to write to the database.</param>
/// <param name="overwriteExisting">If a book with given ISBN already exists, then overwrite it only
/// if overwriteExisting is set to true.</param>
/// <exception cref="Services.Exceptions.AlreadyExistsException">
/// Thrown when the item already exists in the database and overwriteExisting is set to false.</exception>
/// <exception cref="Services.Exceptions.DoesNotExistException">
/// Thrown when the author ids in the viewmodel are invalid.</exception>
/// <exception cref="Services.Exceptions.DataAccessException">
/// Thrown when an error occurs in the data access layer.</exception>
public static void Upsert(EditBookViewModel editBookViewModel, bool overwriteExisting)
{
if (!overwriteExisting)
{
Book tmp;
Book.GetBook(out tmp, editBookViewModel.ISBN);
if (tmp != null)
{
throw new AlreadyExistsException("Aj, aj! En bok med angivet ISBN finns redan!");
}
}
Book book = Mapper.Map<Book>(editBookViewModel);
bool success = true;
try
{
success = Book.Upsert(book, editBookViewModel.AuthorIds);
}
catch (ArgumentException e)
{
if (e.ParamName == "authorIdList")
throw new DoesNotExistException("De angivna författarna finns inte i databasen.");
else
throw;
}
if (!success)
throw new DataAccessException("Tusan! Något gick fel när en bok skulle skapas eller uppdateras. Kontakta en administratör om felet kvarstår.");
}
/// <summary>
/// Populate lists in an EditBookViewModel.
/// </summary>
/// <param name="ebvm">The EditBookViewModel.</param>
/// <returns>Returns an error message or null, if no error occured.</returns>
private string setBookViewLists(EditBookViewModel ebvm)
{
try
{
if (ebvm.ISBN != null)
ebvm.Copies = CopyServices.getCopyViewModels(ebvm.ISBN);
var classDic = ClassificationServices.GetClassificationsAsDictionary();
var authorDic = AuthorServices.GetAuthorsAsDictionary();
ebvm.Classifications = new SelectList(classDic.OrderBy(x => x.Value), "Key", "Value");
ebvm.Authors = new SelectList(authorDic.OrderBy(x => x.Value), "Key", "Value");
}
catch (DataAccessException e)
{
if (ebvm.Copies == null) ebvm.Copies = new List<CopyViewModel>();
if (ebvm.Classifications == null) ebvm.Classifications = new SelectList(new List<SelectListItem>());
if (ebvm.Authors == null) ebvm.Authors = new SelectList(new List<SelectListItem>());
return e.Message;
}
return null;
}