Hi László, I have just added a small example of the SPIN API to create and invoke a SPIN template.
The key idea is to use pre-binding of variables in the Jena QueryExecution:
com.hp.hpl.jena.query.Query arq =
ARQFactory.get().createQuery((Select)template.getBody());
QueryExecution qexec = ARQFactory.get().createQueryExecution(arq, model);
QuerySolutionMap arqBindings = new QuerySolutionMap();
arqBindings.add("predicate", RDFS.label);
qexec.setInitialBinding(arqBindings); // Pre-assign the arguments
ResultSet rs = qexec.execSelect();
The full source code is attached. Please follow up if this doesn't cover your
use case.
Regards,
Holger
On Jul 1, 2011, at 11:21 PM, László Török wrote:
> Hi Scott,
>
> thanks, I think I'm sufficiently comfortable with TBC. What I don't quite
> grok yet, is how to do even simple things programmatically.
>
> Given the example SPIN template below, I'd like to replace the template
> variable with an actual property (which is a resource).
>
> Well, I can surely call toString() on Template to get the SPARQL query as
> string and do some regex magic, but there has to be a more elegant way. The
> javadoc is not very intuitive unfortunatelly. Any pointers how to do that?
> (TBC must be doing it somehow too.. :), no I'm not developing a TBC clone :) )
>
> Thanks,
>
> Las
>
> 2011/7/1 Scott Henninger <[email protected]>
> Las; You should be able to run the SPARQL query against an endpoint
> using the SERVICE keyword. E.g.:
>
> CONSTRUCT{
> _:b0 a spin:ConstraintViolation .
> _:b0 spin:violationRoot ?s .
> _:b0 spin:violationPath ?arg1 .
> }
> WHERE{
> SERVICE <service-uri>
> { ?s ?arg1 ?value .
> FILTER (!regex(str(?value), "^[0-9]{5}$"^^xsd:string))
> }
> }
>
> If you're overwhelmed by the SPIN API, you may want to download TBC-SE/
> ME/Free (http://www.topquadrant.com/products/TB_install.php) to
> experiment with SPIN features before jumping headlong into the API.
>
> -- Scott
>
>
> On Jul 1, 5:45 am, Las <[email protected]> wrote:
> > Hi,
> >
> > just started playing with SPIN 1.2, and I'm a bit overwhelmed.
> >
> > Basically, I've managed to load a serialized SPIN template. [1] I'd
> > like to set the free template variables and run it against a SPARQL
> > endpoint without loading all it's triples into memory (Jena Model).
> >
> > Can anybody give me some pointers how to do that?
> >
> > Thx,
> > Las
> >
> > [1]http://semwebquality.org/ontologies/dq-constraints#FiveDigitNumericAll
>
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> --
> László Török
>
> Skype: laczoka2000
> Twitter: @laczoka
>
>
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TemplateExample.java
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