public static WatcherEvent Pick(List<FileSystemEventWrapper> events)
{
WatcherEvent result = null;
if (events.Count > 0)
{
var @event = events[0];
// waiting for follow up events
if ((DateTime.Now - @event.Time).TotalMilliseconds < 100)
{
return null;
}
// ignore "create new empty folder" event
if (@event.Type == WatcherChangeTypes.Created
&& Directory.Exists(@event.FullPath))
{
events.RemoveAt(0);
return null;
}
ConnectMovedEvent(events);
var series = TryPickSeries(events);
@event = series[0];
var @lastEvent = series[series.Count - 1];
result = new WatcherEvent();
result.Path = @event.Path;
result.Time = @event.Time;
switch (@lastEvent.Type)
{
case WatcherChangeTypes.Created:
case WatcherChangeTypes.Changed:
{
result.Type = WatcherEventChangeTypes.Updated;
break;
}
case WatcherChangeTypes.Deleted:
{
result.Type = WatcherEventChangeTypes.Deleted;
break;
}
case WatcherChangeTypes.Renamed:
{
result.Type = WatcherEventChangeTypes.Moved;
result.NewPath = @lastEvent.NewPath;
break;
}
default:
{
throw new HDWatcherException("Unknow event type " + @lastEvent.Type.ToString());
}
}
return result;
}
return result;
}
private static WatcherEvent TryPickDeleteEvent(List<FileSystemEventWrapper> events)
{
WatcherEvent result = null;
string searchingPath = string.Empty;
for (int i = events.Count; i >= 0; i--)
{
var @event = events[i];
if (result == null)
{
if (@event.Type == WatcherChangeTypes.Deleted)
{
result = new WatcherEvent();
result.Path = @event.Path;
result.Type = WatcherEventChangeTypes.Deleted;
result.Time = @event.Time;
searchingPath = result.Path;
}
}
else
{
if (@event.Type == WatcherChangeTypes.Renamed)
{
if (searchingPath.Equals(@event.NewPath, StringComparison.OrdinalIgnoreCase))
{
searchingPath = @event.Path;
events.RemoveAt(i);
}
}
else
{
if (searchingPath.Equals(@event.Path, StringComparison.OrdinalIgnoreCase))
{
events.RemoveAt(i);
}
}
}
}
return result;
}