Thanks Lorenz for your guidance. Best regards
On Tue, Nov 22, 2016 at 4:29 PM, Lorenz B. < [email protected]> wrote: > Ok, I overlooked that you have the value given. > > > > Lorenz, with regards, > > > > Is it mandatory to use : if( Value == null) > No, not if you can ensure that there is always exactly one value. > > > > I mean every property will have a value. In my case, the property > supposed > > to have three values so I need: > > > > if (Value=="Value1") > You have to use Java object equality instead. > > //do this > > > > if (Value=="Value2") > > //do this > > else > > // do this > > > > However, in general case, I want to ask if we have or expected to have a > > null value, can we do some operation on it or just we display a message > to > > user that value is null? > > > > if( Value == null) > > JOptionPane.showMessageDialog(null, "Value is null"); > You can't do anything on a NULL value - it's a Java NULL. In any case, > you should handle this case and give a warning as you suggested. > > > > > > > > > > > > On Tue, Nov 22, 2016 at 3:59 PM, Lorenz B. < > > [email protected]> wrote: > > > >> > >>> Hello Lorenz thanks, > >>> > >>> You mean something like this: > >>> > >>> RDFNode Value =individual.getPropertyValue(myPropertyName); > >>> > >>> if (Value=="PropertyValue") > >> No, more the other case indeed such that don't have to "know" the value, > >> i.e. > >> > >> if( Value == null) { > >> > >> } else { > >> > >> } > >>> // > >>> > >>> On Tue, Nov 22, 2016 at 3:36 PM, Lorenz B. < > >>> [email protected]> wrote: > >>> > >>>> You can use Individual::getPropertyValue, see [1] > >>>> > >>>> [1] > >>>> https://jena.apache.org/documentation/javadoc/jena/ > >>>> org/apache/jena/ontology/OntResource.html# > getPropertyValue-org.apache. > >>>> jena.rdf.model.Property- > >>>> > >>>>> Does Jena have hasOntProperty() like we have hasOntClass()? In my > >>>> project I > >>>>> need something like if instance/individual has "this property value", > >> do > >>>>> some operation. > >>>>> > >>>>> Thank you for your time. > >>>>> > >>>> -- > >>>> 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 > >> > >> > -- > Lorenz Bühmann > AKSW group, University of Leipzig > Group: http://aksw.org - semantic web research center > >
