I originally asked a variant of this question here:
http://groups.google.com/group/nhusers/browse_thread/thread/3381a892f7478561
Some users have asked me to post my full solution, so I am posting my
code below. The code attempts to obtain the snapshot of the
collection in the same data structure as the original collection.
However, I'm wondering if there is an easier way to do this? It seems
like something that people would commonly want to do, for auditing
purposes, etc.
private static object GetCollectionSnapshot(IPersistentCollection
collection)
{
// the collection is not dirty, then the snapshot is the collection
if (!collection.IsDirty)
{
return collection;
}
// it is dirty, so we need to get the snapshot
ICollection snapshot = collection.CollectionSnapshot.Snapshot;
// sometimes it seems there is no snapshot - in this case we just
return null
// to indicate that the snapshot is empty
if (snapshot == null)
return null;
// unfortunately, the snapshot is not always stored in the same data
structure as the collection itself
if(collection is ISet)
{
// "set"
return new HybridSet(((IDictionary)snapshot).Values);
}
else if(collection is IList && snapshot is IDictionary)
{
// "idbag"
return new ArrayList(((IDictionary) snapshot).Values);
}
else if(collection is IList && snapshot is IList)
{
// "list" or "bag"
// in this case, the NH snapshot is the same type as the
original
collection
return snapshot;
}
else if(collection is IDictionary)
{
// in this case, the NH snapshot is the same type as the
original
collection
return snapshot;
}
else
{
// TODO: implement this for other types of collection
throw new NotImplementedException("Snapshot is not implemented
for
this collection type.");
}
}
Thanks,
jr
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"nhusers" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/nhusers?hl=en
-~----------~----~----~----~------~----~------~--~---
