Have a look at the annotated driven process factory; it would work *exactly*
the same way; after I move the process @annotations into supported status (i.e.
the gt-api module).
So you you know how FilterFunction_area (eek what a terrible name) has the
following:
public Object evaluate(Object feature) {
Geometry arg0;
try { // attempt to get value and perform conversion
arg0 = getExpression(0).evaluate(feature,Geometry.class);
} catch (Exception e) // probably a type error
{
throw new IllegalArgumentException(
"Filter Function problem for function area argument #0 - expected type
Geometry");
}
return new Double(StaticGeometry.area(arg0));
}
Where StaticGeometry.area(arg0) has:
static public double area(Geometry arg0)
{
if (arg0 == null) return -1d;
Geometry _this = arg0;
return _this.getArea();
}
We would update StaticGeometry to have:
@DescribeFunction(name="area", ... )
static public double area(@DescribeParam(name="geom",...) Geometry arg0){
if (arg0 == null) return -1d;
Geometry _this = arg0;
return _this.getArea();
}
And make a base factory class so it can do reflection and sort things out ...
public class StaticGeometry extends
StaticMethodsFunctionFactory<StaticGeometry> {
super("StaticGeometry", StaticGeometry.class );
}
For more details on the approach try the new tutorial for process stuff!
- http://docs.geotools.org/latest/userguide/tutorial/advanced/process.html
Aside I really need to make a post foss4g geotools blog post rounding up the
results of the code sprint; and linking to the presentations etc that used
GeoTools.
--
Jody Garnett
On Thursday, 29 September 2011 at 10:15 PM, Michael Bedward wrote:
> Hi Jody,
>
> > The functions were auto generated ages ago; I am not sure it was ever
> > packaged up as part of the build system.
>
> Phew. Glad to know I wasn't just missing the bleeding obvious.
>
> > I would like to replace them with annotations myself :-)
>
> How would that work ?
>
> Michael
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