/// <summary>Get verion history by URI and timestamp</summary>
/// <param name="uri">object URI</param>
/// <param name="kind">search kind, should be object SearchKind.LatestVersion, SearchKind.LatestBefore or
/// SearchKind.OldestAfter</param>
/// <param name="timestamp">timestamp used to locate version</param>
/// <returns>version of the object or null if no such version is found</returns>
public Thing GetVersion(string uri, SearchKind kind, DateTime timestamp)
{
VersionHistory vh = (VersionHistory)root.prefixUriIndex[uri];
if (vh != null)
{
return(vh.GetVersion(kind, timestamp));
}
return(null);
}
private bool FollowReference(NameVal prop, VersionHistory vh)
{
if (vh != null)
{
if (kind == SearchKind.AllVersions)
{
foreach (Thing v in vh.versions)
{
if (MatchProperty(prop, v))
{
return(true);
}
}
}
else
{
Thing thing = vh.GetVersion(kind, timestamp);
return(thing != null && MatchProperty(prop, thing));
}
}
return(false);
}
static void DumpObject(Thing thing, TextWriter writer, int indent, SearchKind kind, DateTime timestamp, int depth)
{
WriteTab(writer, indent);
string typeName = GetQualifiedName(thing.type.vh.uri, writer);
writer.WriteLine(" rdf:about=\"" + thing.vh.uri + "\" vr:timestamp=\"" + thing.timestamp + "\">");
foreach (PropVal pv in thing.props)
{
object val = pv.val;
if (val is VersionHistory)
{
VersionHistory ptr = (VersionHistory)val;
if (kind != SearchKind.AllVersions)
{
if (depth > 0 || ptr.uri.StartsWith(thing.vh.uri))
{
Thing t = ptr.GetVersion(kind, timestamp);
if (t != null)
{
DumpObject(t, writer, indent + 1, kind, timestamp, depth - 1);
continue;
}
}
}
WriteTab(writer, indent + 1);
GetQualifiedName(pv.def.name, writer);
writer.WriteLine(" rdf:resource=\"" + ptr.uri + "\"/>");
}
else
{
WriteTab(writer, indent + 1);
string propName = GetQualifiedName(pv.def.name, writer);
writer.WriteLine(">" + val + "</" + propName + ">");
}
}
WriteTab(writer, indent);
writer.WriteLine("</" + typeName + ">");
}
private bool FollowReference(NameVal prop, VersionHistory vh)
{
if (vh != null)
{
if (kind == SearchKind.AllVersions)
{
foreach (Thing v in vh.versions)
{
if (MatchProperty(prop, v))
{
return true;
}
}
}
else
{
Thing thing = vh.GetVersion(kind, timestamp);
return thing != null && MatchProperty(prop, thing);
}
}
return false;
}
