// TODO: Put strings into the resources.
//
protected virtual Task <IVh <StreamInfo> > GetSourceStreamAsync(ISubjectFileLoadContext ctx)
{
var taskProxy = default(TaskCompletionSource <IVh <StreamInfo> >);
try {
taskProxy = new TaskCompletionSource <IVh <StreamInfo> >();
//
ctx.EnsureNotNull(nameof(ctx));
//
Uri readUri;
try {
readUri = ctx.BaseUri.Arg($"{nameof(ctx)}.{nameof(ctx.BaseUri)}").EnsureAbsolute().EnsureScheme(UriUtilities.UriSchemeFile).EnsureLoopbackOrUnc().Value;
}
catch (Exception exception) {
throw
new ArgumentException(
message: $"Указанный контекст загрузки имеет недопустимый базовый URI загрузки (свойство '{nameof(ctx)}.{nameof(ctx.BaseUri)}').{Environment.NewLine}\tИмя параметра:{Environment.NewLine}{nameof(ctx).IndentLines2()}{Environment.NewLine}\tКонтекст загрузки (параметр):{Environment.NewLine}{ctx.FmtStr().G().IndentLines2()}",
innerException: exception);
}
//
var file = new FileInfo(readUri.LocalPath);
if (file.Exists)
{
taskProxy
.SetResult(
result:
new StreamInfo(
stream: new FileStream(path: file.FullName, mode: FileMode.Open, access: FileAccess.Read, share: FileShare.Read),
ownsStream: true)
.ToValueHolder(ownsValue: true));
}
else
{
throw
new FileNotFoundException(
message: FormatXResource(locator: typeof(FileNotFoundException), subpath: null, args: new string[] { file.FullName }),
fileName: file.FullName);
}
//
return(taskProxy.Task);
}
catch (Exception exception) {
if (taskProxy?.TrySetException(exception) == true)
{
return(taskProxy.Task);
}
else
{
return(Task.FromException <IVh <StreamInfo> >(exception));
}
}
}
protected override async Task <IVh <StreamInfo> > RecognizeMediaFormatAsync(ISubjectFileLoadContext ctx, Stream stream)
{
ctx.EnsureNotNull(nameof(ctx));
//
if (ctx.File.Extension.EqualsOrdinalCI(DescriptionPackageConstants.PackageJsonFormatFileExtension))
{
return(new StreamInfo(stream: stream, ownsStream: false, contentMediaType: MediaTypeNameUtilities.AppJson).ToValueHolder());
}
else if (ctx.File.Extension.EqualsOrdinalCI(DescriptionPackageConstants.PackageXmlFormatFileExtension))
{
return(new StreamInfo(stream: stream, ownsStream: false, contentMediaType: MediaTypeNameUtilities.AppXml).ToValueHolder());
}
else
{
return(await base.RecognizeMediaFormatAsync(ctx, stream).ConfigureAwait(false));
}
}
protected virtual Task <TSubject> DoMaterializeAsync(ISubjectFileLoadContext context, StreamInfo stream) => base.DoMaterializeAsync(context, stream);
protected virtual Task <IVh <StreamInfo> > RecognizeMediaFormatAsync(ISubjectFileLoadContext ctx, Stream stream) => base.RecognizeMediaFormatAsync(ctx, stream);
