I started playing around with adding parameter info to FunctionName today. I
attached a very rough page to this issue:
>
> http://jira.codehaus.org/browse/GEOT-3569
>
> By no means complete or ready to commit, but wanted to post it to foster
> discussion and get some initial feedback.
>
> So basically I tried to follow Jody's advice and reuse on of the existing
> "parameter" classes we have, which actually turned out to be troublesome.
> Basically here are the candidates i could find:
>
> 1. org.geotools.data.Parameter
> 2. org.opengis.parameter.ParameterDescriptor
>
> 1 would work generally but it is declared in gt main wheras the function
> interface lives in gt-opengis.
Darn; sorry Justin I did not think of that.
> 2 sort of works but is (a) an absolute nightmare to program against
> (getName() not returning a string, etc..). And it does not really allow me to
> set min and max occurs cleanly. And quite honestly is really overkill for
> what we need.
>
>
Yeah number (2) is horrible.
> So moving forward i see the following possibilities:
> 1. Stick with ParameterDescriptor even though it is really messy
>
>
please no!
> 2. Factor out an interface for org.geotools.data.Parameter into gt-opengis
>
>
Better idea; see below.
> 3. Roll our own new interface for Function parameters
>
>
Only advantage here would be an exact 1/2 match for the filter capabilities
document. I am really loath to introduce anything new (as have to make yet
another set of dynamic user interfaces support classes etc...
> 4. Use some alternative that i did not find.
>
>
4.1. Move org.geotools.data.Parameter to gt-opengis
We could also just move the code over; remember we originally wanted to
combined gt-opengis and gt-api; but are stuck on a few issues (mostly
ReferencedEnvelope making use of the CRS utility class internally).
4.2 Variation on 2+3 - make an interface for FunctionParameters; and make
org.geotools.data.Parameter implement it?
> Thanks all. Feedback welcome.
>
>
Thanks for looking at what is an annoying problem Justin; I am sorry I was not
more clear (org.opengis.parameter.ParameterDescriptor is indeed a nightmare to
use).
Jody
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