public override VersionUriList GetItemVersions(ItemDefinition itemDefinition, CallContext context)
{
#if DEBUG
var timer = Stopwatch.StartNew();
#endif
var headList = HeadProvider.GetItemVersions(itemDefinition, context);
if (headList != null && headList.Count > 0)
{
return(headList);
}
var itemVersions = ReadOnlyProviders.Select(provider => provider.GetItemVersions(itemDefinition))
.FirstOrDefault(list => list != null && list.Count > 0);
#if DEBUG
this.Trace(itemVersions, timer, itemDefinition, context);
#endif
return
(itemVersions ?? new VersionUriList());
}