Hello Lorenz, this was the question I was expected to ask? I mean values of
BestCategory are resources.
Kindly if you can guide me how to get the value, I searched it on the web
but could not found any related resources.
Kind regards
On Wed, Jan 18, 2017 at 10:57 AM, Lorenz B. <
buehm...@informatik.uni-leipzig.de> wrote:
>
> > OntModel model2=ModelFactory.createOntologyModel(
> OntModelSpec.OWL_DL_MEM);
> > InputStream in =FileManager.get().open("F://20-8.owl");
> > if (in==null) {
> > throw new IllegalArgumentException( "File: " + " not
> > found");
> > } model2.read(in,"");
> >
> > String ns="
> > http://www.semanticweb.org/t/ontologies/2016/7/myOWL#";;
> >
> > OntProperty favcat=model2.getOntProperty(ns+ "BestCategory");
> > String name=jTextField1.getText();
> > Individual indiv = user1.createIndividual(ns + name);
> > RDFNode phFav=indiv.getPropertyValue(favcat);
> > if (phFav!=null){
> > Literal l1=phFav.asLiteral();
> If BestCategory is an object property, why do you cast the value as
> literal?!
> >
> > s1=l1.toString(); }
> > }
> > if (s1=="CatPhysics"){
> > JOptionPane.showMessageDialog(null, "Physics");
> > }
> >
> > The rule itself is
> >
> > String rule ="[rule1: ( ?x http://www.semanticweb.org/
> > t/ontologies/2016/7/myOWL#Physics_Preferred_Category ?cat1 )" +
> > "( ?x http://www.semanticweb.org/t/ontologies/2016/7/myOWL#
> > Chem_Preferred_Category ?cat2 )" +
> > "( ?x http://www.semanticweb.org/t/ontologies/2016/7/myOWL#Geo_
> > Preferred_Category ?cat3 )" +
> > "greaterThan(?cat1,?cat2), greaterThan(?cat1,?cat3)"
> > + " -> (?x http://www.semanticweb.org/t/
> > ontologies/2016/7/myOWL#BestCategory http://www.semanticweb.org/t/
> > ontologies/2016/7/myOWL#BestCategory#Physics )]";
> >
> >
> > The BestCategory is object property.
> >
> > Regards
> >
> >
> > On Tue, Jan 17, 2017 at 8:16 PM, Andy Seaborne <a...@apache.org> wrote:
> >
> >> A Complete, Minimal Example please.
> >>
> >>
> >> Partial code, no data is not complete.
> >> It must compile and run to be complete.
> >>
> >> Minimal means only what is necessary to ask the question not the whole
> >> data or whole application.
> >>
> >> Andy
> >>
> >> On 17/01/17 17:14, Sidra shah wrote:
> >>
> >>> I am surprise that when there is no value in BestCategory, it gives me
> no
> >>> error and when the rule executes and value comes in BestCategory, it
> gives
> >>> me now *"RequiredLiteralException*"
> >>>
> >>> The code I used here is
> >>>
> >>> OntProperty favcat=model2.getOntProperty(ns+ "BestCategory");
> >>>
> >>> RDFNode phFav=indiv.getPropertyValue(favcat);
> >>> if (phFav!=null){
> >>> Literal l1=phFav.asLiteral();
> >>>
> >>> s1=l1.toString();}
> >>>
> >>> if (s1=="CatPhysics"){
> >>> JOptionPane.showMessageDialog(null, "Physics");
> >>> }
> >>>
> >>> Best regards
> >>>
> >>> On Tue, Jan 17, 2017 at 5:53 PM, Sidra shah <s.shahcyp...@gmail.com>
> >>> wrote:
> >>>
> >>> Hello Chris, thanks a lot for your suggestion.
> >>>> Best regards.
> >>>>
> >>>> On Tue, Jan 17, 2017 at 5:37 PM, Chris Dollin <
> >>>> chris.dol...@epimorphics.com> wrote:
> >>>>
> >>>>
> >>>>> On 17/01/17 13:30, Sidra shah wrote:
> >>>>>
> >>>>> Hi Lorenz, I am sorry but with much regards, you discussed here the
> >>>>>> problem, not the solution :) :)
> >>>>>>
> >>>>>> I know this if there is no value, there must be Null exception,
> >>>>>>
> >>>>>>
> >>>>> This is not true.
> >>>>>
> >>>>> but can you suggest me a way where we dodge the compiler
> >>>>>
> >>>>>>
> >>>>> No "dodging" of the compiler is required. Instead, just write
> >>>>> perfectly ordinary code that tests to see if the result of
> >>>>> getPropertyValue is null, and take one action if it isn't and
> >>>>> a different one if it is.
> >>>>>
> >>>>> There's nothing special about this. You don't need to use
> >>>>> break (which is for escaping from loops); just an if
> >>>>> with suitable then and else parts.
> >>>>>
> >>>>> I know this is more a Java problem, but any help I will appreciate.
> >>>>>
> >>>>>>
> >>>>> Find someone /local/ doing the same or similar course and talk to
> >>>>> them (and have them talk to you) about programming and this
> >>>>> problem. I don't mean copy each other's work; I mean use each
> >>>>> other to understand what the problem is about and how the code
> >>>>> works. Each of you will know things that the other doesn't; share.
> >>>>>
> >>>>> Chris
> >>>>>
> >>>>> --
> >>>>> "He could not weigh up which was worse and so tried not to think
> about
> >>>>> either."
> >>>>> /The Spellgrinder's
> >>>>> Apprentice/
> >>>>>
> >>>>> Epimorphics Ltd, http://www.epimorphics.com
> >>>>> Registered address: Court Lodge, 105 High Street, Portishead, Bristol
> >>>>> BS20 6PT
> >>>>> Epimorphics Ltd. is a limited company registered in England (number
> >>>>> 7016688)
> >>>>>
> >>>>>
> >>>>
> --
> Lorenz Bühmann
> AKSW group, University of Leipzig
> Group: http://aksw.org - semantic web research center
>
>
