I misunderstood about Model.createResource().
So, I changed the source to which you guess, and then the program worked
well.
Thanks a lot!
(2013年11月08日 10:24), Holger Knublauch wrote:
In those lines
Resource rsrc = model.createResource();
org.topbraid.spin.model.Query query =
SPINFactory.asQuery(rsrc); // This function always returns null.
you are first creating a new Resource which has no triples attached to
it, and then try to convert it to a Query. This is not how it will work.
You need to find an existing instance of sp:Select from your Model, e.g.
using
StmtIterator it = model.listStatements(null, RDF.type, SP.Select);
while(it.hasNext()) {
Resource rsrc = it.next().getSubject();
....
}
HTH
Holger
On 11/8/2013 11:20, [email protected] wrote:
Hi Holger,
I got it.
I attached the source code.
Thanks,
Ryo
2013?11?8???? 9?59?29? UTC+9 Holger Knublauch:
Hi Ryo,
sorry I cannot see what would be wrong. I would need a complete
example (Java code) to reproduce this.
Regards,
Holger
On 11/8/2013 10:38, [email protected] <javascript:> wrote:
Hi Holger,
The rdf:types of the resource is http://spinrdf.org/sp#Select
<http://spinrdf.org/sp#Select> .
Thanks,
Ryo
2013?11?6???? 13?45?20? UTC+9 Holger Knublauch:
Hi,
the resource needs to have rdf:type sp:Select (or sp:Ask
etc). Could you
send me the part of the (Turtle) source code that defines
that resource,
or (even better) print out the rdf:types of the resource in
the Jena model?
Thanks,
Holger
On 11/1/2013 13:38, [email protected] wrote:
> Hi,
>
> I'm trying to convert a file of SPIN query in RDF to raw
SPARQL query
> with the API.
> I used
>
com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel().read(InputStream,
> String, String).createResource() to convert SPIN query to
> com.hp.hpl.jena.rdf.model.Resource.
> Converting to com.hp.hpl.jena.rdf.model.Resource might be
successful
>
(com.hp.hpl.jena.rdf.model.Resource.getModel().write(Writer)
runs well).
> However,
SPINFactory.asQuery(com.hp.hpl.jena.rdf.model.Resource)
> returned null.
> What is wrong? The RDF file is right.
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