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https://issues.apache.org/jira/browse/JENA-631?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joshua Taylor updated JENA-631:
-------------------------------
Attachment: PropertyFunctionsNotCalledInPath.java
Code to demonstrate the issue.
> property functions are not called from property paths
> -----------------------------------------------------
>
> Key: JENA-631
> URL: https://issues.apache.org/jira/browse/JENA-631
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ, Jena
> Affects Versions: Jena 2.11.1
> Reporter: Joshua Taylor
> Attachments: PropertyFunctionsNotCalledInPath.java
>
>
> Property functions in certain property paths are not invoked. This was
> discussed on the users mailing list [1], and sample code to reproduce follows.
> [1]
> http://mail-archives.apache.org/mod_mbox/jena-users/201401.mbox/%3CCA%2BQ4JnnO4oOLzdA0OP1csP8fr_RRdtRW_p_o8D9%2BKpwvisTm8g%40mail.gmail.com%3E
> import com.hp.hpl.jena.graph.Node;
> import com.hp.hpl.jena.query.Query;
> import com.hp.hpl.jena.query.QueryExecutionFactory;
> import com.hp.hpl.jena.query.QueryFactory;
> import com.hp.hpl.jena.rdf.model.Model;
> import com.hp.hpl.jena.rdf.model.ModelFactory;
> import com.hp.hpl.jena.sparql.algebra.Algebra;
> import com.hp.hpl.jena.sparql.engine.ExecutionContext;
> import com.hp.hpl.jena.sparql.engine.QueryIterator;
> import com.hp.hpl.jena.sparql.engine.binding.Binding;
> import com.hp.hpl.jena.sparql.pfunction.PropFuncArg;
> import com.hp.hpl.jena.sparql.pfunction.library.version;
> import com.hp.hpl.jena.vocabulary.RDFS;
> public class PropertyFunctionsNotCalledInPath {
> // This class isn't important. It's just an extension of an existing
> property
> // function class so that we can add some output.
> public static class versionEx extends version {
> @Override
> public QueryIterator execEvaluated(Binding binding, PropFuncArg
> subject, Node predicate, PropFuncArg object, ExecutionContext execCxt) {
> System.out.println( "** Calling versionEx **" );
> return super.execEvaluated(binding, subject, predicate,
> object, execCxt);
> }
>
> }
> public static void main(String[] args) {
> Model model = ModelFactory.createDefaultModel();
> model.add( RDFS.Class, RDFS.comment, RDFS.Class );
> String[] queries = {
> "ask { ?s
> <java:PropertyFunctionsNotCalledInPath$versionEx> \"foo\" }" ,
> "ask { ?s
> <java:PropertyFunctionsNotCalledInPath$versionEx>? \"foo\" }" };
>
> for ( String queryString : queries ) {
> Query query = QueryFactory.create( queryString );
> System.out.println( "Result:
> "+QueryExecutionFactory.create( query, model ).execAsk() );
> System.out.println( "Query: "+queryString );
> System.out.println( "Algebra: "+Algebra.compile( query
> ));
> }
>
> /*
> * Output is as follows. The versionEx property function gets
> called in the
> * simple case, but not in the case of the more complicated
> property path.
> * Neither algebra expression has a propertyfunc operator; the
> first just
> * uses (triple ...).
> ** Calling versionEx **
> Result: false
> Query: ask { ?s <java:PropertyFunctionsNotCalledInPath$versionEx> "foo" }
> Algebra: (bgp (triple ?s <java:PropertyFunctionsNotCalledInPath$versionEx>
> "foo"))
> Result: true
> Query: ask { ?s <java:PropertyFunctionsNotCalledInPath$versionEx>? "foo" }
> Algebra: (path ?s (path? <java:PropertyFunctionsNotCalledInPath$versionEx>)
> "foo")
> */
> }
> }
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