public static FeedElement ToStreamEventBackwardFeed(ClientMessage.ReadStreamEventsBackwardCompleted msg,
Uri requestedUrl, EmbedLevel embedContent, bool headOfStream)
{
Ensure.NotNull(msg, "msg");
string escapedStreamId = Uri.EscapeDataString(msg.EventStreamId);
var self = HostName.Combine(requestedUrl, "/streams/{0}", escapedStreamId);
var feed = new FeedElement();
feed.SetTitle(string.Format("Event stream '{0}'", msg.EventStreamId));
feed.StreamId = msg.EventStreamId;
feed.SetId(self);
feed.SetUpdated(msg.Events.Length > 0 && msg.Events[0].Event != null
? msg.Events[0].Event.TimeStamp
: DateTime.MinValue.ToUniversalTime());
feed.SetAuthor(AtomSpecs.Author);
feed.SetHeadOfStream(headOfStream); //TODO AN: remove this ?
feed.SetSelfUrl(self);
//TODO AN: remove this ?
if (headOfStream) //NOTE: etag workaround - to be fixed with better http handling model
{
feed.SetETag(Configure.GetPositionETag(msg.LastEventNumber, ContentType.AtomJson));
}
var prevEventNumber = Math.Min(msg.FromEventNumber, msg.LastEventNumber) + 1;
var nextEventNumber = msg.FromEventNumber - msg.MaxCount;
feed.AddLink("self", self);
feed.AddLink("first",
HostName.Combine(requestedUrl, "/streams/{0}/head/backward/{1}", escapedStreamId, msg.MaxCount));
if (!msg.IsEndOfStream)
{
if (nextEventNumber < 0)
{
throw new Exception(string.Format("nextEventNumber is negative: {0} while IsEndOfStream",
nextEventNumber));
}
feed.AddLink("last",
HostName.Combine(requestedUrl, "/streams/{0}/{1}/forward/{2}", escapedStreamId, 0, msg.MaxCount));
feed.AddLink("next",
HostName.Combine(requestedUrl, "/streams/{0}/{1}/backward/{2}", escapedStreamId, nextEventNumber,
msg.MaxCount));
}
feed.AddLink("previous",
HostName.Combine(requestedUrl, "/streams/{0}/{1}/forward/{2}", escapedStreamId, prevEventNumber,
msg.MaxCount));
feed.AddLink("metadata", HostName.Combine(requestedUrl, "/streams/{0}/metadata", escapedStreamId));
for (int i = 0; i < msg.Events.Length; ++i)
{
feed.AddEntry(ToEntry(msg.Events[i], requestedUrl, embedContent));
}
return(feed);
}