private List <BookItem> GetBooksForClass(
Valence.Request.Parameters param,
Valence.OrgUnitInfo course,
ref string message)
{
Uri uri = param.UserContext.CreateAuthenticatedUri(
"/d2l/api/" + param.ApiVersion("le") + "/" + course.Id + "/content/isbn/", "GET");
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "GET";
var handler = new Valence.Request.ErrorHandler();
var result = new List <BookItem>();
Valence.Request.Perform(
request, param.UserContext,
delegate(string data) {
var serializer = new JavaScriptSerializer();
var books = serializer.Deserialize <Valence.Book[]>(data);
if ((books == null) || (books.Length <= 0))
{
return;
}
foreach (Valence.Book b in books)
{
try {
GoogleBook.Volume volume = GoogleBook.Api.Query(b.Isbn);
if (volume.TotalItems != 0)
{
GoogleBook.Item item = volume.items.First();
BookItem book = FromGoogleBookToBookItem(item);
result.Add(book);
}
} catch (ArgumentNullException) {}
}
},
handler.Process);
if (handler.IsError)
{
message = "Unable to retrieve assigned books. " + handler.Message;
}
return(result);
}
static public BookItem Adapt(GoogleBook.Item book)
{
if (book.VolumeInfo.Title == null)
{
throw new ArgumentNullException();
}
var item = new BookItem {
Title = book.VolumeInfo.Title, Author = ""
};
if (book.VolumeInfo.Authors != null)
{
item.Author = string.Join(", ", book.VolumeInfo.Authors);
}
item.Isbn = "";
if (book.VolumeInfo.IndustryIdentifiers != null)
{
foreach (GoogleBook.Item._VolumeInfo.IndustryIdentifierItem id
in book.VolumeInfo.IndustryIdentifiers)
{
if (id.Type.StartsWith("ISBN_10"))
{
item.Isbn = id.Identifier;
}
}
}
if (item.Isbn.Length == 0)
{
throw new ArgumentNullException();
}
item.ThumbnailUrl = "";
if ((book.VolumeInfo.ImageLinks != null) &&
(book.VolumeInfo.ImageLinks.Thumbnail != null))
{
item.ThumbnailUrl = book.VolumeInfo.ImageLinks.Thumbnail;
}
return(item);
}
public IEnumerable <BookItem> AssignedBooks()
{
const string ROUTE = "";
var client = CreateClient();
var request = CreateContentRequest(ROUTE, Method.GET);
var response = client.Execute <List <Valence.Book> >(request);
if (response.StatusCode != HttpStatusCode.OK)
{
throw new InvalidOperationException("Unable to get isbns from course. Returned status: " + response.StatusCode);
}
var bookList = new List <BookItem>();
foreach (Valence.Book b in response.Data)
{
try {
GoogleBook.Volume volume = GoogleBook.Api.Query(b.Isbn);
if (volume.TotalItems != 0)
{
GoogleBook.Item item = volume.items.First();
BookItem book = GoogleBookAdaptor.Adapt(item);
// ensure that the isbn in the LMS is set. Sometimes GoogleBooks returns an alternate ISBN
book.Isbn = b.Isbn;
bookList.Add(book);
}
} catch (ArgumentNullException) {}
}
return(bookList);
}
