On Fri, 2011-04-29 at 11:17 -0600, Justin Deoliveira wrote:
> Hi all,
>
>
> I wanted to continue on with some chat about the FunctionName
> interface. Jody recently modified it to return a list of argument
> names. However as Andrea noted in that thread it does not give any
> information about the types of those arguments.
>
>
> Well as it turns out for wfs 2.0/fes 2.0 the filter capabilities
> requires information about argument type. I could just do something
> lame and stick in xs:any or something like that but I figure it might
> be worth some modifications to the interface.
>
>
> Furthermore the spec requires that a function declare its return type
> as well. So the idea would be to modify FunctionName as follows:
>
>
> interface FunctionName {
>
>
> List<FunctionParameter> getArguments();
>
>
> FunctionParameter getReturn();
> }
>
>
> interface FunctionParameter {
> String getName();
> Class getType();
> }
>
>
> Now Andrea also brought up the issue of functions that take a variable
> number of arguments. One possibly solution might be to add some sort
> of flag like:
>
>
> interface FunctionName {
> boolean hasVariableArguments();
> }
>
>
> Or perhaps follow VolatileFunction and come with an interface called
> VariableArgumentFunction. Such functions would return an empty
> argument list. Or depending on if all the arguments are the same type
> maybe a single argument. Actually following this thought maybe a flag
> on FunctionParameter makes more sense:
>
>
> interface FunctionParameter {
> ...
> boolean isVariable();
> }
>
>
>
>
> Anyways thoughts?
interface FunctionParameter {
...
NumberRange<Integer> getCardinality();
}
would cover most possible cases? (array argument with bounded and
unbounded min/max limits)
2c./
>
>
>
> -Justin
>
>
>
> --
> Justin Deoliveira
> OpenGeo - http://opengeo.org
> Enterprise support for open source geospatial.
>
>
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--
Gabriel Roldan
grol...@opengeo.org
Expert service straight from the developers
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