Sorry, that should have been "not" asked on the Jena user group...
On 18 Jan 2017 7:09 pm, "Dick Murray" <dandh...@gmail.com> wrote:
You need to learn the difference between == and .equals().
Please read up on basic Java skills! These questions should be asked on the
Jena user group...
On 18 Jan 2017 1:14 pm, "Sidra shah" <s.shahcyp...@gmail.com> wrote:
Hello Lorenz, its not giving me the exception now but it does not display
the message JOption,. It does not read the * if (s1=="CatPhysics")*
RDFNode phFav=indiv.getPropertyValue(favcat);
if (phFav!=null){
RDFNode l1=phFav.asResource();
String s1=l1.toString();
}
if (s1=="CatPhysics"){
JOptionPane.showMessageDialog(null, "Phyics category");
}
On Wed, Jan 18, 2017 at 2:12 PM, Sidra shah <s.shahcyp...@gmail.com> wrote:
> Thank you Lorenz, let me read the document you mention here. I will come
> back after reading and applying.
>
> Best regards
>
> On Wed, Jan 18, 2017 at 1:46 PM, Lorenz B. <buehm...@informatik.uni-
> leipzig.de> wrote:
>
>> What is for you the "value of a resource"? The URI?
>>
>> There is only one good source for developers, and that's Javadoc [1] -
>> that's why we always refer to if people have questions.
>>
>> asResource() converts the RDFNode object to a resource
>>
>> [1]
>> https://jena.apache.org/documentation/javadoc/jena/org/
>> apache/jena/rdf/model/RDFNode.html
>>
>> > 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/o
>> ntologies/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
>> >>
>> >>
>> --
>> Lorenz Bühmann
>> AKSW group, University of Leipzig
>> Group: http://aksw.org - semantic web research center
>>
>>
>
