Asking around there was tones of stuff that SQLUnpacker did not do ... talking to Jesse we cannot remember the details right now. Jesse has been fixing the PostPreProcessing but could not do all the simplification until he moves to trunk.
Yeah, 'tons of stuff', but when I asked for details all I got was the theoretical filter thing which wasn't implemented. I backed down because they had already done the work, but in general I think we should start to get less accepting of new work unless it actually does something significantly better, and that justification should be provided. Hopefully the new policies will make this happen more. But I do regret not being more forceful about making use of SQLUnpacker, since it was one of the first pieces of code I wrote for GeoTools I thought maybe it was lacking. But to be honest refactoring something that is being used and keeping the interface around is much better than throwing it out and writing something new. Indeed when the switch was made it introduced new problems. GeoTools is going to languish just being used by uDig and GeoServer until we figure out how to stick with an API, even if there are improvements that can be made.

Chris


Looking at *both* these implementations I think they are an example of code reuse getting in the way of clarity. It would be nice to have a utility class that breaks down a Filter into just the part you can encode, and then directly encode the good part into SQL with confidence.

I would find it much more clear to make a class that does this in one pass; that is accepts a filter and outputs both an SQL statement and the leftover filter that could not be encoded. That way we do not split up decision making between two classes.

Cheers,
Jody



Farber, Saul (ENV) wrote:
This is kind of a targeted question, but I'll throw it out to the list to see 
if anyone else can answer too.

Why is SQLUnpacker deprecated?

Looking at PostPreProcessFilterSplittingVisitor the only thing I can figure 
that it's doing that SQLUnpacker isn't doing is handling client-side 
transactions via a ClientTransactionAccessor.

Is there something fundamentally flawed about SQLUnpacker?  I do have to say 
that SQLUnpacker is MUCH more clearly and concisely written.

--saul

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