SparqlBuilder for Construct query with Union

[F Amer]

Can someone point me to some examples of using SparqlBuilder to formulate Construct query of the type below ? My eventual goal is to be able to dynamically union multiple named graphs depending upon request.

construct {?s ?p ?o} where {

   { graph <http://www.example1.com> {?s ?p ?o} }

   union

   { graph <http://www.example2.com> {?s ?p ?o} }

 }

Thanks

[Jeen Broekstra]

The code should be something like this:

Variable s = var("s"), p = var("p"), o = var("o");

TriplePattern spo = s.has(p, o);

ConstructQuery q = Queries.CONSTRUCT(spo)

    .where(GraphPatterns.union(

        and(spo).from(Rdf.iri("http://example1.com")),

        and(spo).from(Rdf.iri("http://example2.com"))

    )

);

Unfortunately, there appears to be a bug in the SparqlBuilder: the above produces a syntactically illegal query (the builder neglects to put curly braces around the union arguments). This is a known bug (https://github.com/eclipse/rdf4j/issues/2614) that we haven't gotten around to fixing yet.

Cheers,

Jeen

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[F Amer]

Thank you.

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