Hi Hong,
your starting point is an RDF string serialized in Turtle. So you first
need to convert that Turtle snippet to a Jena Model. The following code
should work, assuming source is your Turtle snippet.
Model model = JenaUtil.createDefaultModel();
model.read(new StringReader(source), "urn:x-dummy:base",
FileUtils.langTurtle);
// Get the first instance of sp:Select *
Resource queryResource = model.listStatements(null, RDF.type,
SP.Select).next().getSubject();
org.topbraid.spin.model.Query spinQuery =
SPINFactory.asQuery(queryResource);
Now you have a SPIN query object that you can turn into either the
string or Jena Query object as shown in SPINParsingExamples.
HTH
Holger
* note that this is a bit brittle - the Model may contain another
instance of sp:Select as a nested sub-query. In that case, the query is
more complex, and you would need to get the instance of sp:Select that
has no incoming triples, e.g. !model.contains(null, null, queryResource)
On 4/30/2012 18:37, Hong Sun wrote:
Dear All,
I am now looking for a method to in the SPIN API open source to
convert the SPIN RDF syntax string below to Jena Query.
@prefix ex:<http://example.org/demo#> .
@prefix rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
[] a<http://spinrdf.org/sp#Select> ;
<http://spinrdf.org/sp#resultVariables>
(_:b1) ;
<http://spinrdf.org/sp#where>
([<http://spinrdf.org/sp#object>
ex:Person ;
<http://spinrdf.org/sp#predicate>
rdf:type ;
<http://spinrdf.org/sp#subject>
_:b1
]) .
_:b1<http://spinrdf.org/sp#varName>
"person"^^<http://www.w3.org/2001/XMLSchema#string> .
The online service (SPIN RDF Syntax to SPARQL Text Converter)
http://spinservices.org/spinrdfconverter.html provides the desired
function. But which method (in the SPIN API open source) should I use
to create a Query object with the String text stated above? (e.g. a
counterpart of ARQFactory.get().createQuery() to create Query based on
SPIN syntax)
Thanks in advance!
Hong
--
You received this message because you are subscribed to the Google
Group "TopBraid Suite Users", the topics of which include Enterprise Vocabulary
Network (EVN), TopBraid Composer,
TopBraid Live, TopBraid Ensemble, SPARQLMotion and SPIN.
To post to this group, send email to
[email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/topbraid-users?hl=en
