public PaginatedContentSource(Func <ContentEntry, object> getViewModel, IContentProviderService service, ContentSearchOptions options, ContentPage initialPage)
{
if (initialPage is null)
{
throw new ArgumentNullException(nameof(initialPage));
}
this.getViewModel = getViewModel;
this.service = service ?? throw new ArgumentNullException(nameof(service));
this.options = options ?? throw new ArgumentNullException(nameof(options));
this.items.AddRange(initialPage.Entries.Select(e => getViewModel(e)));
this.pageSize = initialPage.Entries.Count;
}
public async Task EnsurePresentAsync(FileSample sample, IProgress <double> progress = null, CancellationToken cancellationToken = default)
{
if (sample is null)
{
throw new ArgumentNullException(nameof(sample));
}
if (await this.storage.GetIsPresentAsync(sample.Id, sample.ContentHash))
{
progress?.Report(1);
return;
}
if (!this.settings.DownloadInBackground)
{
Task <bool> downloadQuestionTask;
if (this.downloadInBackground != null)
{
downloadQuestionTask = this.downloadInBackground;
}
else
{
lock (this.settings) {
if (this.downloadInBackground == null)
{
// TODO: Localize
var prompt = new PromptMessage("Download missing files", "Some of the files for these elements are missing. Would you like to download them now?", "Download");
Messenger.Default.Send(prompt);
this.downloadInBackground = prompt.Result;
downloadQuestionTask = this.downloadInBackground;
}
else
{
downloadQuestionTask = this.downloadInBackground;
}
}
}
if (!await downloadQuestionTask)
{
progress?.Report(1);
return;
}
}
IContentProviderService[] providers = await this.services.GetServicesAsync <IContentProviderService> ().ConfigureAwait(false);
IContentProviderService handler = providers.FirstOrDefault(c => c.CanAcquire(sample));
ManagedDownload download = null;
if (handler != null)
{
string id = handler.GetEntryIdFromUrl(sample.SourceUrl);
if (id != null)
{
ContentEntry entry = await handler.GetEntryAsync(id, cancellationToken);
download = QueueDownload(sample.Id, sample.Name, handler.DownloadEntryAsync(id), entry.Size, sample.ContentHash, progress, cancellationToken);
}
}
if (download == null)
{
if (!Uri.TryCreate(sample.SourceUrl, UriKind.Absolute, out Uri uri))
{
progress?.Report(1);
throw new ArgumentException();
}
if (uri.IsFile)
{
if (await this.storage.GetIsPresentAsync(uri))
{
progress?.Report(1);
return;
}
else
{
progress?.Report(1);
throw new FileNotFoundException();
}
}
download = QueueDownload(sample.Id, sample.Name, new Uri(sample.SourceUrl), sample.ContentHash, progress, cancellationToken);
}
await download.Task;
}
internal ContentProviderModelValidator()
{
ContentProviderService = new DdsContentProviderService();
}
