On Mon, Aug 13, 2012 at 6:21 AM, Andrea Aime
<[email protected]>wrote:
> Hi,
> I was looking into ways to get the default values for process parameters
> in the annotations
> and found out that it's not possible, because an annotation parameter can
> only
> be a Class, primitive, String or an array of those...
> Bummer!
>
> Maybe a way to get default values anyways could be to annotate static
> constant?
>
> @DefaultValue(name="paramName")
> public static final XYZ_DEFAULT= theValue;
>
> or as an alternative, have @DescribeParameter(...
> default="theStaticFieldName").
> Neither of these would be refactoring safe.
>
I could go for either of these... the first is nice because its direct but
the second is nice because it keeps the default with all the rest of the
metadata.
>
> As a final alternative, go with a naming convention, if the parameter is
> name XYWZ look for
> a constant named XYWZ_DEFAULT in the process class
>
> Definitely not as nice as it would have been with a direct attribute in
> the @DescribeParameter,
> and none of them is refactoring safe, but the latter has at least the
> advantage of brevity.
>
> What do you think, worth doing?
>
I think it would be worth doing as it helps further to reduce the boiler
plate. Even though its not refactor safe what about having the annotation
based factory do a validation check on the parameters. It still wouldn't be
refactor safe but as long as you ran a test case that causes the annotation
based process factory to load you should get an error.
>
> Cheers
> Andrea
>
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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