Java Code Examples for org.apache.jena.query.Query#addResultVar()
The following examples show how to use
org.apache.jena.query.Query#addResultVar() .
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Example 1
| Source File: TriplestoreResource.java From trellis with Apache License 2.0 | 6 votes |
|
/**
* This code is equivalent to the SPARQL query below.
*
* <p><pre><code>
* SELECT ?subject ?predicate ?object
* WHERE { GRAPH fromGraphName { ?subject ?predicate ?object } }
* </code></pre>
*/
private Stream<Quad> fetchAllFromGraph(final String fromGraphName, final IRI toGraphName) {
final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(SUBJECT);
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);
final ElementPathBlock epb = new ElementPathBlock();
epb.addTriple(create(SUBJECT, PREDICATE, OBJECT));
final ElementGroup elg = new ElementGroup();
elg.addElement(new ElementNamedGraph(createURI(fromGraphName), epb));
q.setQueryPattern(elg);
final Stream.Builder<Quad> builder = builder();
rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(toGraphName,
getSubject(qs), getPredicate(qs), getObject(qs))));
return builder.build();
}
Example 2
| Source File: TriplestoreResource.java From trellis with Apache License 2.0 | 5 votes |
|
/**
* Fetch data for this resource.
*
* <p>This is equivalent to the following SPARQL query:
* <pre><code>
* SELECT ?predicate ?object ?binarySubject ?binaryPredicate ?binaryObject
* WHERE {
* GRAPH trellis:PreferServerManaged {
* IDENTIFIER ?predicate ?object
* OPTIONAL {
* IDENTIFIER dc:hasPart ?binarySubject .
* ?binarySubject ?binaryPredicate ?binaryObject
* }
* }
* }
* </code></pre>
*/
protected void fetchData() {
LOGGER.debug("Fetching data from RDF datastore for: {}", identifier);
final Var binarySubject = Var.alloc("binarySubject");
final Var binaryPredicate = Var.alloc("binaryPredicate");
final Var binaryObject = Var.alloc("binaryObject");
final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);
q.addResultVar(binarySubject);
q.addResultVar(binaryPredicate);
q.addResultVar(binaryObject);
final ElementPathBlock epb1 = new ElementPathBlock();
epb1.addTriple(create(toJena(identifier), PREDICATE, OBJECT));
final ElementPathBlock epb2 = new ElementPathBlock();
epb2.addTriple(create(toJena(identifier), toJena(DC.hasPart), binarySubject));
epb2.addTriple(create(toJena(identifier), type.asNode(), toJena(LDP.NonRDFSource)));
epb2.addTriple(create(binarySubject, binaryPredicate, binaryObject));
final ElementGroup elg = new ElementGroup();
elg.addElement(epb1);
elg.addElement(new ElementOptional(epb2));
q.setQueryPattern(new ElementNamedGraph(toJena(Trellis.PreferServerManaged), elg));
rdfConnection.querySelect(q, qs -> {
final RDFNode s = qs.get("binarySubject");
final RDFNode p = qs.get("binaryPredicate");
final RDFNode o = qs.get("binaryObject");
nodesToTriple(s, p, o).ifPresent(t -> data.put(t.getPredicate(), t.getObject()));
data.put(getPredicate(qs), getObject(qs));
});
}
Example 3
| Source File: TriplestoreResource.java From trellis with Apache License 2.0 | 5 votes |
|
/**
* This code is equivalent to the SPARQL query below.
*
* <p><pre><code>
* SELECT ?subject ?predicate ?object
* WHERE {
* GRAPH trellis:PreferServerManaged {
* ?s ldp:member IDENTIFIER .
* ?s ldp:membershipResource ?subject .
* ?s rdf:type ldp:IndirectContainer .
* ?s ldp:membershipRelation ?predicate .
* ?s ldp:insertedContentRelation ?o .
* ?res dc:isPartOf ?s .
* }
* GRAPH ?res { ?res ?o ?object }
* }
* </code></pre>
*/
private Stream<Quad> fetchIndirectMemberQuads() {
final Var s = Var.alloc("s");
final Var o = Var.alloc("o");
final Var res = Var.alloc("res");
final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(SUBJECT);
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);
final ElementPathBlock epb1 = new ElementPathBlock();
epb1.addTriple(create(s, toJena(LDP.member), toJena(identifier)));
epb1.addTriple(create(s, toJena(LDP.membershipResource), SUBJECT));
epb1.addTriple(create(s, type.asNode(), toJena(LDP.IndirectContainer)));
epb1.addTriple(create(s, toJena(LDP.hasMemberRelation), PREDICATE));
epb1.addTriple(create(s, toJena(LDP.insertedContentRelation), o));
epb1.addTriple(create(res, toJena(DC.isPartOf), s));
final ElementPathBlock epb2 = new ElementPathBlock();
epb2.addTriple(create(res, o, OBJECT));
final ElementGroup elg = new ElementGroup();
elg.addElement(new ElementNamedGraph(toJena(Trellis.PreferServerManaged), epb1));
elg.addElement(new ElementNamedGraph(res, epb2));
q.setQueryPattern(elg);
final Stream.Builder<Quad> builder = builder();
rdfConnection.querySelect(q, qs ->
builder.accept(rdf.createQuad(LDP.PreferMembership, getSubject(qs), getPredicate(qs), getObject(qs))));
return builder.build();
}
Example 4
| Source File: TriplestoreResource.java From trellis with Apache License 2.0 | 5 votes |
|
/**
* This code is equivalent to the SPARQL query below.
*
* <p><pre><code>
* SELECT ?subject ?predicate ?object ?type
* WHERE {
* GRAPH trellis:PreferServerManaged {
* ?s ldp:member IDENTIFIER
* ?s ldp:membershipResource ?subject
* ?s ldp:hasMemberRelation ?predicate
* ?s ldp:insertedContentRelation ldp:MemberSubject
* ?object dc:isPartOf ?s
* ?object rdf:type ?type .
* }
* }
* </code></pre>
*/
private Stream<Quad> fetchDirectMemberQuads() {
final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(SUBJECT);
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);
q.addResultVar(TYPE);
final Var s = Var.alloc("s");
final ElementPathBlock epb = new ElementPathBlock();
epb.addTriple(create(s, toJena(LDP.member), toJena(identifier)));
epb.addTriple(create(s, toJena(LDP.membershipResource), SUBJECT));
epb.addTriple(create(s, toJena(LDP.hasMemberRelation), PREDICATE));
epb.addTriple(create(s, toJena(LDP.insertedContentRelation), toJena(LDP.MemberSubject)));
epb.addTriple(create(OBJECT, toJena(DC.isPartOf), s));
epb.addTriple(create(OBJECT, type.asNode(), TYPE));
final ElementNamedGraph ng = new ElementNamedGraph(toJena(Trellis.PreferServerManaged), epb);
final ElementGroup elg = new ElementGroup();
elg.addElement(ng);
q.setQueryPattern(elg);
final Stream.Builder<Quad> builder = builder();
rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(LDP.PreferMembership,
getSubject(qs), getPredicate(qs), adjustIdentifier((IRI) getObject(qs), getType(qs)))));
return builder.build();
}
Example 5
| Source File: TriplestoreResource.java From trellis with Apache License 2.0 | 5 votes |
|
/**
* This code is equivalent to the SPARQL query below.
*
* <p><pre><code>
* SELECT ?predicate ?object ?type
* WHERE {
* GRAPH trellis:PreferServerManaged {
* IDENTIFIER dc:isPartOf ?subject .
* ?subject ldp:isMemberOfRelation ?predicate .
* ?subject ldp:membershipResource ?object .
* ?subject ldp:insertedContentRelation ldp:MemberSubject .
* ?object rdf:type ?type .
* }
* }
* </code></pre>
*/
private Stream<Quad> fetchDirectMemberQuadsInverse() {
final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(PREDICATE);
q.addResultVar(OBJECT);
q.addResultVar(TYPE);
final ElementPathBlock epb = new ElementPathBlock();
epb.addTriple(create(toJena(identifier), toJena(DC.isPartOf), SUBJECT));
epb.addTriple(create(SUBJECT, toJena(LDP.isMemberOfRelation), PREDICATE));
epb.addTriple(create(SUBJECT, toJena(LDP.membershipResource), OBJECT));
epb.addTriple(create(SUBJECT, toJena(LDP.insertedContentRelation), toJena(LDP.MemberSubject)));
epb.addTriple(create(OBJECT, type.asNode(), TYPE));
final ElementNamedGraph ng = new ElementNamedGraph(toJena(Trellis.PreferServerManaged), epb);
final ElementGroup elg = new ElementGroup();
elg.addElement(ng);
q.setQueryPattern(elg);
final Stream.Builder<Quad> builder = builder();
final IRI ixnModel = getInteractionModel();
final IRI subject = adjustIdentifier(identifier, ixnModel);
rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(LDP.PreferMembership, subject,
getPredicate(qs), getObject(qs))));
return builder.build();
}
Example 6
| Source File: TriplestoreResource.java From trellis with Apache License 2.0 | 5 votes |
|
/**
* This code is equivalent to the SPARQL query below.
*
* <p><pre><code>
* SELECT ?object ?type
* WHERE {
* GRAPH trellis:PreferServerManaged {
* ?object dc:isPartOf IDENTIFIER .
* ?object rdf:type ?type .
* }
* }
* </code></pre>
*/
private Stream<Quad> fetchContainmentQuads() {
if (getInteractionModel().getIRIString().endsWith("Container")) {
final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(OBJECT);
q.addResultVar(TYPE);
final ElementPathBlock epb = new ElementPathBlock();
epb.addTriple(create(OBJECT, toJena(DC.isPartOf), toJena(identifier)));
epb.addTriple(create(OBJECT, type.asNode(), TYPE));
final ElementNamedGraph ng = new ElementNamedGraph(toJena(Trellis.PreferServerManaged), epb);
final ElementGroup elg = new ElementGroup();
elg.addElement(ng);
q.setQueryPattern(elg);
final Stream.Builder<Quad> builder = builder();
final IRI ixnModel = getInteractionModel();
final IRI subject = adjustIdentifier(identifier, ixnModel);
rdfConnection.querySelect(q, qs -> builder.accept(rdf.createQuad(LDP.PreferContainment,
subject, LDP.contains, adjustIdentifier((IRI) getObject(qs), getType(qs)))));
return builder.build();
}
return Stream.empty();
}
Example 7
| Source File: TriplestoreResourceService.java From trellis with Apache License 2.0 | 4 votes |
|
/**
* This code is equivalent to the SPARQL queries below.
*
* <pre><code>
* SELECT ?object WHERE {
* GRAPH trellis:PreferServerManaged { IDENTIFIER rdf:type ?object }
* }
* </code></pre>
*
* <pre><code>
* INSERT DATA {
* GRAPH trellis:PreferServerManaged {
* IDENTIFIER rdf:type ldp:Container ;
* dc:modified "NOW"^^xsd:dateTime }
* GRAPH IDENTIFIER?ext=audit {
* IDENTIFIER prov:wasGeneratedBy [
* rdf:type prov:Activity , as:Create ;
* prov:wasAssociatedWith trellis:AdministorAgent ;
* prov:atTime "TIME"^^xsd:dateTime ] }
* GRAPH IDENTIFIER?ext=acl {
* IDENTIFIER acl:mode acl.Read , acl:Write , acl:Control ;
* acl:agentClass foaf:Agent ;
* acl:accessTo IDENTIFIER }
* }
*
* </code></pre>
*/
@PostConstruct
public void initialize() {
final IRI root = rdf.createIRI(TRELLIS_DATA_PREFIX);
final Query q = new Query();
q.setQuerySelectType();
q.addResultVar(OBJECT);
final ElementPathBlock epb = new ElementPathBlock();
epb.addTriple(triple(toJena(root), toJena(type), OBJECT));
final ElementNamedGraph ng = new ElementNamedGraph(toJena(PreferServerManaged), epb);
final ElementGroup elg = new ElementGroup();
elg.addElement(ng);
q.setQueryPattern(elg);
final Stream.Builder<RDFTerm> builder = builder();
rdfConnection.querySelect(q, qs -> builder.accept(getObject(qs)));
if (!builder.build().findFirst().isPresent()) {
final Literal time = rdf.createLiteral(now().toString(), XSD.dateTime);
final IRI auth = rdf.createIRI(TRELLIS_DATA_PREFIX + "#auth");
final UpdateRequest update = new UpdateRequest();
final QuadDataAcc sink = new QuadDataAcc();
sink.addQuad(new Quad(toJena(PreferServerManaged), triple(toJena(root), toJena(type),
toJena(LDP.BasicContainer))));
sink.addQuad(new Quad(toJena(PreferServerManaged), triple(toJena(root), toJena(DC.modified),
toJena(time))));
sink.addQuad(new Quad(getExtIRI(root, ACL_EXT), triple(toJena(auth), toJena(ACL.mode), toJena(ACL.Read))));
sink.addQuad(new Quad(getExtIRI(root, ACL_EXT), triple(toJena(auth), toJena(ACL.mode), toJena(ACL.Write))));
sink.addQuad(new Quad(getExtIRI(root, ACL_EXT), triple(toJena(auth), toJena(ACL.mode),
toJena(ACL.Control))));
sink.addQuad(new Quad(getExtIRI(root, ACL_EXT), triple(toJena(auth), toJena(ACL.agentClass),
toJena(FOAF.Agent))));
sink.addQuad(new Quad(getExtIRI(root, ACL_EXT), triple(toJena(auth), toJena(ACL.accessTo), toJena(root))));
update.add(new UpdateDataInsert(sink));
rdfConnection.update(update);
}
LOGGER.info("Initialized Trellis Triplestore Resource Service");
}
