Some progress reported against http://jira.codehaus.org/browse/GEOT-3508

Eric if you can review when you get a chance; you should be able to try your 
groovy tests and see if I missed anything, add comments to the Jira issue and 
we can work through the results.

Summary of Actions:
- We had a problem with a base class tripping up instanceof checks (so NotImpl 
would show up as a BinaryLogicalOperator), rather than accept the utility 
methods as a work around I have fixed the issue with our class structure. This 
should only effect code that was halfway between the opengis interfaces and the 
geotools interfaces (we had one test failure as a result of this fix - and it 
was a class cast exception in the test case).
- We had a number of new utility methods for the Filters class; focused on 
appending and removing "children" from an existing And or Or filter. This 
pointed out that geChildren() returned a mutable list - fixing that did not 
introduce any troubles (except in Kevin's code)

Finally
- I have not quite gotten to terms with the PrePostFilterVisitor class; it 
seems to be trying to match patterns in the filter data structure (ie find a 
greaterThan filter where the propertyName is "zone"). Suggestions are welcome.


-- 
Jody Garnett

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