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();
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 <[email protected]> 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 <[email protected]>
>> wrote:
>>
>> Hello Chris, thanks a lot for your suggestion.
>>>
>>> Best regards.
>>>
>>> On Tue, Jan 17, 2017 at 5:37 PM, Chris Dollin <
>>> [email protected]> 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)
>>>>
>>>>
>>>
>>>
>>
