public void CreateIndexOn(ActivityStreamFilter filter)
{
filter = this.filter.Extend(filter);
var path = filter.ToUri(null);
Writers.Add(new FilteredObjectIdStreamWriter(filter, OpenWrite(path), ctx));
Indexes.Add(filter);
}
protected virtual Task <BaseObjectStreamReader> OpenReader(ActivityStreamFilter filter)
{
BaseObjectStreamReader ret = null;
string path = null;
foreach (var index in Indexes)
{
if (index.Contains(filter))
{
path = Localize(index.ToUri(null));
if (System.IO.File.Exists(path))
{
break;
}
else
{
path = null;
}
}
}
if (path == null)
{
path = Localize(filter.ToUri(null));
if (!System.IO.File.Exists(path))
{
path = Localize(filter.ToPath(null));
}
}
if (System.IO.File.Exists(path))
{
switch (System.IO.Path.GetExtension(path))
{
case ".index":
{
var s = System.IO.File.OpenRead(path);
if (filter.reverse)
{
ret = new ReverseObjectIdStreamReader(s, id =>
{
var p = Localize(filter.ToPath(id));
if (System.IO.File.Exists(p))
{
return(System.IO.File.OpenRead(p));
}
else
{
return(null);
}
}, _serializer);
}
else
{
ret = new ObjectIdStreamReader(s, id => System.IO.File.OpenRead(Localize(filter.ToPath(id))), _serializer);
}
}
break;
case ".json":
ret = new ObjectStreamReader(System.IO.File.OpenRead(path), _serializer);
break;
default:
throw new Exception($"Invalid activity stream type: {path}");
}
}
else
{
ret = new EmptyObjectStreamReader();
}
return(Task.FromResult(ret));
}