async Task<IEnumerable<Track>> ImportDirectory(string directoryName,
CancellationToken cancellationToken, IProgress<string> progress)
{
if (directoryName == null) throw new ArgumentNullException("directoryName");
if (progress == null) throw new ArgumentNullException("progress");
cancellationToken.ThrowIfCancellationRequested();
messenger.SendToUI(new BeganScanningDirectoryEvent());
progress.ReportFormat("Scanning {0}...", Path.GetFileName(directoryName));
var filenames = Directory
.GetFiles(directoryName, "*.*", SearchOption.AllDirectories)
.Where(loader.IsSupportedFileFormat);
return await ImportAsync(filenames, cancellationToken, progress)
.ContinueWith<IEnumerable<Track>>(OnImportComplete);
}
public async Task<IEnumerable<Track>> ImportAsync(string filename,
CancellationToken cancellationToken, IProgress<string> progress)
{
if (filename == null) throw new ArgumentNullException("filename");
cancellationToken.ThrowIfCancellationRequested();
if (IsDirectory(filename))
return await ImportDirectory(filename, cancellationToken, progress);
if (!loader.IsSupportedFileFormat(filename))
return Enumerable.Empty<Track>();
progress.ReportFormat("Loading {0}", Path.GetFileName(filename));
Track track;
if (TryGetTrack(filename, out track))
return new[] { track };
track = await loader.LoadAsync(filename);
await storage.AddTrackAsync(track);
tracks.Add(track.Id, track);
messenger.SendToUI(new TrackAddedToLibraryEvent(track));
return new[] { track };
}