Is there an easy way to write a FilterVisitor that looks at all
Filters/Expressions passed to it regardless of type? This would allow for
visitors that returned all Filters of a specified type (like Intersects or
even SpatialOperator) or return all Filters that reference a specified
property name.
If the answer is, "No, not without overriding every method in
DefaultFilterVisitor", then I propose that DefaultFilterVisitor have two
methods added to it - preVisit and postVisit.
protected Object preVisit(Object o, Object data) {
return data;
}
protected Object postVisit(Object o, Object data) {
return data;
}
all other calls (except visitNullFilter) invoke these prior to and after
doing any other work. If folks would rather such functionality not be in
DefaultFilterVisitor itself, then I have a subclass that I'd like to
contribute which extends DefaultFilterVisitor with these methods. I can
also contribute the two visitors I used as examples above - FindType and
FindPropertyUsage.
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