Hi Andy
indeed I first posted the question to SO..
here's the code; it's using Jena 3.6.0. I'm attaching the base and imported
.ttl files as well.
indeed the extension of the mapped file was invalid, but even changing it to
.ttl didn't help.
note that the query in queryModel() does produce results when the import is not
redirected
package com.jenatest;
import java.io.FileNotFoundException;
import org.apache.jena.query.Query;
import org.apache.jena.query.QueryExecution;
import org.apache.jena.query.QueryExecutionFactory;
import org.apache.jena.query.QueryFactory;
import org.apache.jena.query.QuerySolution;
import org.apache.jena.query.ResultSet;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.rdf.model.RDFNode;
import org.apache.jena.util.FileManager;
import org.apache.jena.util.LocationMapper;
public class App {
public void queryModel(Model model) {
Query sparql = QueryFactory.create("prefix ab:
<http://learningsparql.com/ns/addressbook#>\n" +
"prefix d: <http://learningsparql.com/ns/data#>\n" +
"\n" +
"select ?email ?courseTitle\n" +
" { \n" +
" ?d ab:email ?email ;\n" +
" ab:takingCourse ?course .\n" +
" ?course ab:courseTitle ?courseTitle\n" +
"}");
Query query = QueryFactory.create(sparql);
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet rs = qe.execSelect();
while (rs.hasNext()) {
QuerySolution qs = rs.next();
RDFNode r = qs.get("email");
System.out.println("email: " + r);
}
}
public void complexLoad() throws FileNotFoundException {
LocationMapper mapper = new LocationMapper();
mapper.addAltEntry("file:///Users/tht/workspace/jenatest/test_course.ttl",
"file:///Users/tht/workspace/jenatest/test_course.redirected.ttl");
Model model = ModelFactory.createOntologyModel();
String source = "/Users/tht/workspace/jenatest/test_book.ttl";
FileManager fileManager = new FileManager(mapper);
fileManager.addLocatorFile();
fileManager.readModel(model, "file://" + source, "TURTLE");
queryModel(model);
}
public static void main(String[] args) {
App app = new App();
try {
app.complexLoad();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
>-------- Оригинално писмо --------
>От: Andy Seaborne [email protected]
>Относно: Re: Jena doesn't use LocationMapper on owl-imports
>До: [email protected]
>Изпратено на: 13.04.2018 13:02
> same as yesterday's
>
> https://stackoverflow.com/questions/49801630/jena-doesnt-use-locationmapper-on-owl-imports
>
> Please provide a complete, minimal, debuggable example, and also say
> which version of Jena you are using.
>
> Andy
>
> PS redirecting to a file with an extension that does not indicate the
> RDF syntax will not work.
>
> On 13/04/18 10:21, r. r. wrote:
> > Hello!
> > I have a ttl file with owl-imports clause like
> >
> >
> >
> > @prefix xsd: <http://www.w3.org/2001/XMLSchema#>
> >
> > <http://test/data.ttl>
> > a owl:Ontology ;
> > owl:imports <file:///Users/tht/workspace/jenatest/test_course.ttl> ;
> > owl:versionInfo "tht testing owl:imports"^^xsd:string .
> >
> >
> >
> >
> > When test_course.ttl file exists, FileManager.get().readModel loads
> > the model, the other ttl is imported and sparql queries work fine. But
> > if I remove the file and use
> > FileManager.get().setLocationMapper().addAltEntry() to redirect to
> > another existing file, the model is not what i expect and the sparql
> > queries return no results.
> >
> >
> >
> >
> > So owl-imports works fine, but it seems like Jena is not using
> > LocationMapper when importing? or could it be my mapping uris are
> > incorrect? I'm using something like
> >
> >
> >
> >
> >
> > mapper.addAltEntry("file:///Users/tht/workspace/jenatest/test_course.ttl",
> > "file:///Users/tht/workspace/jenatest/test_course.ttl.redirected")
> >
> >
> > Thanks for any hints!
> >
> >
> >
> >
