public bool TryUpdate(Stream catalogStream, BookSource books, VolumeSource volumes,
Func<Date, bool> update, Func<bool> confirm)
{
var progress = Log.Action(5, "Trying catalog update...");
progress.Continue("Opening remote catalog...");
var parser = new CatalogParser { Log = Log };
using (var reader = parser.Open(catalogStream)) {
progress.Continue("Checking remote creation date...");
var date = parser.GetCreated(reader);
Log.Verbose("Remote creation date: {0}.", date);
if (update(date)) {
progress.Continue("Updating local catalog...");
string bookPath = null, volumePath = null;
try {
using (var bookStream = books.Create(out bookPath))
using (var volumeStream = volumes.Create(out volumePath))
Convert(parser, reader, date, bookStream, volumeStream);
progress.Continue("Copying converted catalog...");
if (confirm()) {
books.Update(bookPath);
volumes.Update(volumePath);
Log.Verbose("Local catalog updated.");
progress.Finish();
return true;
}
} finally {
if (bookPath != null)
IOUtility.DeleteTempFile(bookPath);
if (volumePath != null)
IOUtility.DeleteTempFile(volumePath);
}
Log.Warning("Local catalog left intact.");
progress.Finish();
return false;
}
Log.Warning("Local catalog up-to-date.");
progress.Finish();
return false;
}
}
