public async Task <CollectionObject> Get(ActivityStreamFilter filter)
{
var ret = new List <BaseObject>();
var pipe = this.ctx.GetPipe();
var ctx = new ActivityDeliveryContext
{
IsReading = true,
context = this.ctx, box = this, Filter = filter
};
var tryCount = 0;
using (var reader = await OpenReader(filter))
{
while (true)
{
var item = await reader.Read();
if (item == null)
{
if (tryCount == 0)
{
return(null);
}
break;
}
else if (item is Error err)
{
ret.Add(item);
}
else if (item is ActivityObject activity)
{
if (filter.IsMatch(activity))
{
ctx.item = activity;
var res = await pipe.Pipe(ctx) ?? ctx.item;
if (res != null)
{
ret.Add(res);
}
}
}
else
{
throw new Exception($"Invalid type {item.type}");
}
tryCount++;
}
}
if (ctx.Undos.Count > 0)
{
ret = ret.Where(r => !ctx.Undos.Contains(r.id)).ToList();
}
return(ret.ToCollection());
}
public override Task Write(BaseObject item)
{
if (_filter.IsMatch(item))
{
return(base.Write(item));
}
else
{
return(Task.CompletedTask);
}
}