I have tried many options to execute user defined SPIN functions. But i
could not succeed.
*SPIN Function*:
SELECT ?users
WHERE {
{
SELECT ((GROUP_CONCAT(DISTINCT ?user; SEPARATOR=',')) AS ?users)
WHERE {
?user a :Person .
?user :accountAge ?age .
FILTER (?age <= 10) .
}
} .
}
*SPARQL Query:*
SELECT (<http://www.semanticweb.org/socure.me/activityOntology#InvalidUser>()
AS ?u) {}
It works fine in TopBraid Composer. But doesn't work in coding.
I have tried in 4 methods and everything returns empty result. They are,
// TYPE 1
registry.registerAll(model, null);
String str = "SELECT ?x WHERE { BIND (<
http://topbraid.org/sparqlmotionfunctions#parseDate>('12/3/11','MM/dd/
yy') as ?x) }";
QueryExecution exec = QueryExecutionFactory.create(str, model);
ResultSet resultSet = exec.execSelect();
ResultSetFormatter.out(resultSet);
// TYPE 2
Resource queryResource = model.listStatements(null, RDF.type,
SP.Select).next().getSubject();
Select selectQuery = (Select) SPINFactory.asQuery(queryResource);
List<Resource> res = selectQuery.getResultVariables();
System.out.println(res.get(0).toString());
// TYPE 3
Function function = registry.getFunction("
http://www.semanticweb.org/socure.me/activityOntology#InvalidUser";, model);
registry.registerFunctions(model, function);
String query = "SELECT (<
http://www.semanticweb.org/socure.me/activityOntology#InvalidUser>() AS ?u)
{}";
QueryExecution exec = QueryExecutionFactory.create(query, model);
ResultSet resultSet = exec.execSelect();
System.out.println(resultSet.getRowNumber());
// TYPE 4
Query arqQuery = new ARQFactory().createQuery(spinQuery);
QueryExecution exec = QueryExecutionFactory.create(arqQuery, model);
ResultSet resultSet = exec.execSelect();
System.out.println(resultSet.getRowNumber());
Type 1 is predefined function. Even that is returning empty result. I am
not sure whether this is the correct methods.
If someone could help me resolve this problem.
Awaiting for your reply.
Thanks
---
Leo Anbarasan M
India
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