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Subject: Re: Question on JCasUtil's selectCovered(...)
From: Richard Eckart de Castilho <rec@apache.org>
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Date: Sun, 2 Aug 2015 00:09:57 +0200
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On 01.08.2015, at 23:06, Martin Wunderlich <martin_wu@gmx.net> wrote:

> Yes, I think you might be right, Richard, and that the problem is with =
the use of Generics.=20
>=20
> This would be the concrete FE class:=20
>=20
> public class StartingPositionOfPremiseUFE<Premise> extends =
StartingPositionOfPropositionUFE {
>=20
>    public static String FN_STARTINGPOSITIONOFPROPOSITION =3D =
"StartingPositionOfPremise";
>=20
> 	@Override
> 	List<Premise> getPropositions(JCas jcas, int start, int end) {
> 		return JCasUtil.selectCovered(jcas, Premise.class, =
start, end);
> 	}
> }

I don't see why you would define <Premise> here on the subclass. You =
would either define a type variable on the subclass or bind a type =
variable on the superclass, so:

public class StartingPositionOfPremiseUFE extends =
StartingPositionOfPropositionUFE<Premise>

> The call to selectCovered(=85) gives the described error. The method =
getPropositions(=85) is defined as abstract in the super-class, which =
looks like this:=20
>=20
>=20
> abstract public class StartingPositionOfPropositionUFE<T extends =
Proposition> extends FeatureExtractorResource_ImplBase implements =
ClassificationUnitFeatureExtractor{
> 	...
>    public List<Feature> extract(JCas jcas, TextClassificationUnit =
classificationUnit) {
>    	List<? extends Proposition> props =3D (List<? extends =
Proposition>) getPropositions(jcas, start, end);

Instead of <? extends Proposition>, I think you should be using <T>.

>        if( props !=3D null && props.size() > 0) {
>        	Proposition firstProposition =3D props.get(0);
>        	startingPos =3D firstProposition.getBegin();
>        }
>=20
> 	List<Feature> featList =3D new ArrayList<Feature>();
>        featList.add(new Feature(FN_STARTINGPOSITIONOFPROPOSITION, =
startingPos));
>=20
>        return featList;
>    }
>=20
>    abstract List<?> getPropositions(JCas jcas, int start, int end);

Again, instead of <?> I think you should be using <T>.

> }
>=20
> I=92ve removed the irrelevant bits to make it more concise.=20

I still don't see why you would get that error though.=20

Are you sure that "Premise.class" resolves to the right class here and =
not to another class which accidentally has the same name?

-- Richard=