Hi Holger,
thanks, it was giant leap towards the solution. However, it is important
that I can run the instantiated template query against an external SPARQL
endpoint, as seen in the following snippet.
Query arqQuery =
ARQFactory.get().createQuery((org.topbraid.spin.model.Construct)templ.getBody());
List<String> sparqlEndpoint = new ArrayList<String>();
sparqlEndpoint.add("http://edgy:8890/sparql";);
QueryEngineHTTP qexec =
ARQFactory.get().createRemoteQueryExecution(arqQuery, sparqlEndpoint);
QuerySolutionMap arqBindings = new QuerySolutionMap();
arqBindings.add("predicate", RDFS.label);
arqBindings.add("arg1", postalCodeProp);
qexec.setInitialBinding(arqBindings);
qexec.execConstruct(newTriples);
ISSUE: QueryEngineHTTP doesn't not implement setInitialBinding. :( An
alternative could be (as I've heard), to add SERVICE to the query. However,
I didn't find a way to do it using some factory or fluent builder in the
API. I could surely resort to toString() and some regex or String.replace
magic, but then SPIN API would be degraded to a SPARQL serialization library
in the given scenario.
Let me know what you think.
Thanks,
Las
2011/7/5 Holger Knublauch <[email protected]>
> 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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> Composer,
> TopBraid Live, TopBraid Ensemble, SPARQLMotion and SPIN.
> To post to this group, send email to
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--
László Török
Skype: laczoka2000
Twitter: @laczoka
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