Examples with Quad org.apache.jena.sparql.core.Quad used on opensource projects

Example 91 with Quad

use of org.apache.jena.sparql.core.Quad in project jena by apache.

the class QuadBlockCompilerMain method compile.

//@Override
@Override
public final SqlNode compile(QuadBlock quads) {
    SqlNode sqlNode = slotCompiler.start(quads);
    // Copy it because it's modified.
    quads = new QuadBlock(quads);
    // ---- Stage builder 
    SqlStageList sList = new SqlStageList();
    // Potential concurrent modification - need to use an explicit index.
    for (int i = 0; i < quads.size(); ) {
        Quad q = quads.get(i);
        if (patternTable != null && patternTable.trigger(q)) {
            // Removes current quad
            SqlStage stage = patternTable.process(i, quads);
            if (stage != null) {
                if (quads.get(i) == q)
                    throw new SDBInternalError("Pattern table returned a stage but did not remove the first quad");
                sList.add(stage);
                continue;
            }
        }
        sList.add(new SqlStageBasicQuad(q));
        i++;
    }
    // ---- and now turn the stages into SqlNodes  
    SqlNode sqlStages = sList.build(request, slotCompiler);
    // --- Join the initial node (constants). 
    sqlNode = SqlBuilder.innerJoin(request, sqlNode, sqlStages);
    sqlNode = slotCompiler.finish(sqlNode, quads);
    // Insert DISTINCT if accessing the RDF merge of all named graphs
    // An RDF Merge is the DISTINCT results of query over the union of all graphs.
    // Or in TransformSDB
    boolean needDistinct = false;
    // Either it's the uniongraph ...
    if (quads.getGraphNode().equals(Quad.unionGraph))
        needDistinct = true;
    else // Or it's the union graph via redirected defaultGraph
    if (Quad.isDefaultGraphGenerated(quads.getGraphNode()) && request.getContext().isTrue(SDB.unionDefaultGraph))
        needDistinct = true;
    if (needDistinct) {
        // DISTINCT -- over the named variables but not * (which includes the graph node).
        String renameName = request.genId("A");
        //sqlNode = SqlRename.view(renameName, sqlNode) ;
        sqlNode = SqlBuilder.view(request, sqlNode);
        sqlNode = SqlBuilder.distinct(request, sqlNode);
    }
    return sqlNode;
}

Example 92 with Quad

use of org.apache.jena.sparql.core.Quad in project jena by apache.

the class QBR_SubType method rewrite.

@Override
public QuadBlock rewrite(SDBRequest request, QuadBlock quadBlock) {
    if (!quadBlock.contains(null, null, rdfType, null))
        return quadBlock;
    quadBlock = new QuadBlock(quadBlock);
    int i = 0;
    // Better/clearer : do as copy over from one block to another. 
    while ((i = quadBlock.findFirst(i, null, null, rdfType, null)) != -1) {
        // { :s rdf:type :C } => { :s rdf:type ?V . ?V rdfs:subClassOf :C } 
        Quad rdfTypeQuad = quadBlock.get(i);
        Var var = request.genVar();
        Quad q1 = new Quad(rdfTypeQuad.getGraph(), rdfTypeQuad.getSubject(), rdfType, var);
        Quad q2 = new Quad(rdfTypeQuad.getGraph(), var, RDFS.subClassOf.asNode(), rdfTypeQuad.getObject());
        // replace rdf:type statement
        quadBlock.set(i, q1);
        // add subClassOf statement
        quadBlock.add(i + 1, q2);
        // Skip the two statements.
        i = i + 2;
    }
    return quadBlock;
}

Example 93 with Quad

use of org.apache.jena.sparql.core.Quad in project jena by apache.

the class T_QuadsObjectIsNull method dump.

private static void dump(DatasetGraphTransaction dsg) {
    dsg.begin(ReadWrite.READ);
    Iterator<Quad> iter = dsg.find();
    for (; iter.hasNext(); ) {
        Quad q = iter.next();
        System.out.println(q);
    }
    //RiotWriter.writeNQuads(System.out, dsg) ;
    dsg.commit();
    dsg.end();
}

Example 94 with Quad

use of org.apache.jena.sparql.core.Quad in project jena by apache.

the class TestConcurrentAccess method mrswDataset1.

@Test(expected = ConcurrentModificationException.class)
public void mrswDataset1() {
    DatasetGraph dsg = create().asDatasetGraph();
    Quad quad = SSE.parseQuad("(<g> <y> <p> 99)");
    Iterator<Quad> iter = dsg.find();
    dsg.add(quad);
    // Bad - after an update.
    iter.hasNext();
    iter.next();
}

Example 95 with Quad

use of org.apache.jena.sparql.core.Quad in project jena by apache.

the class TestConcurrentAccess method mrswSPARQL1.

@Test
public void mrswSPARQL1() {
    Dataset ds = create();
    Query query = QueryFactory.create("SELECT * { ?s ?p ?o}");
    try (QueryExecution qExec = QueryExecutionFactory.create(query, ds)) {
        ResultSet rs = qExec.execSelect();
        while (rs.hasNext()) rs.next();
    }
    DatasetGraph dsg = ds.asDatasetGraph();
    Quad quad = SSE.parseQuad("(<g> <y> <p> 99)");
    dsg.add(quad);
    Iterator<Quad> iter = dsg.find();
    iter.hasNext();
    iter.next();
}