Examples with StatementPattern org.eclipse.rdf4j.query.algebra.StatementPattern used on opensource projects

Example 1 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class QueryModelBuilder method visit.

@Override
public Object visit(ASTBasicPathExprTail tailNode, Object data) throws VisitorException {
    List<Var> subjVars = (List<Var>) data;
    Var predVar = (Var) tailNode.getEdge().jjtAccept(this, null);
    List<Var> objVars = (List<Var>) tailNode.getNode().jjtAccept(this, null);
    Var contextVar = graphPattern.getContextVar();
    StatementPattern.Scope spScope = graphPattern.getStatementPatternScope();
    for (Var subjVar : subjVars) {
        for (Var objVar : objVars) {
            StatementPattern sp = new StatementPattern(spScope, subjVar, predVar, objVar, contextVar);
            graphPattern.addRequiredTE(sp);
        }
    }
    // Process next tail segment
    ASTPathExprTail nextTailNode = tailNode.getNextTail();
    if (nextTailNode != null) {
        List<Var> joinVars = nextTailNode.isBranch() ? subjVars : objVars;
        nextTailNode.jjtAccept(this, joinVars);
    }
    return null;
}

Example 2 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class QueryModelBuilder method visit.

@Override
public Var visit(ASTReifiedStat node, Object data) throws VisitorException {
    assert node.getID() != null : "ID variable not set";
    Var subjVar = (Var) node.getSubject().jjtAccept(this, null);
    Var predVar = (Var) node.getPredicate().jjtAccept(this, null);
    Var objVar = (Var) node.getObject().jjtAccept(this, null);
    Var idVar = (Var) node.getID().jjtAccept(this, null);
    Var contextVar = graphPattern.getContextVar();
    StatementPattern.Scope spScope = graphPattern.getStatementPatternScope();
    Var rdfType = new Var("_rdfType", RDF.TYPE);
    Var rdfStatement = new Var("_rdfStatement", RDF.STATEMENT);
    Var rdfSubject = new Var("_rdfSubject", RDF.SUBJECT);
    Var rdfPredicate = new Var("_rdfPredicate", RDF.PREDICATE);
    Var rdfObject = new Var("_rdfObject", RDF.OBJECT);
    graphPattern.addRequiredTE(new StatementPattern(spScope, idVar, rdfType, rdfStatement, contextVar));
    graphPattern.addRequiredTE(new StatementPattern(spScope, idVar, rdfSubject, subjVar, contextVar));
    graphPattern.addRequiredTE(new StatementPattern(spScope, idVar, rdfPredicate, predVar, contextVar));
    graphPattern.addRequiredTE(new StatementPattern(spScope, idVar, rdfObject, objVar, contextVar));
    return idVar;
}

Example 3 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class TupleExprBuilder method visit.

@Override
public TupleExpr visit(ASTConstruct node, Object data) throws VisitorException {
    TupleExpr result = (TupleExpr) data;
    // Collect construct triples
    graphPattern = new GraphPattern();
    super.visit(node, null);
    TupleExpr constructExpr = graphPattern.buildTupleExpr();
    // Retrieve all StatementPatterns from the construct expression
    List<StatementPattern> statementPatterns = StatementPatternCollector.process(constructExpr);
    if (constructExpr instanceof Filter) {
        // sameTerm filters in construct (this can happen when there's a
        // cyclic
        // path defined, see SES-1685 and SES-2104)
        // we remove the sameTerm filters by simply replacing all mapped
        // variable occurrences
        Set<SameTerm> sameTermConstraints = getSameTermConstraints((Filter) constructExpr);
        statementPatterns = replaceSameTermVars(statementPatterns, sameTermConstraints);
    }
    Set<Var> constructVars = getConstructVars(statementPatterns);
    VarCollector whereClauseVarCollector = new VarCollector();
    result.visit(whereClauseVarCollector);
    // Create BNodeGenerators for all anonymous variables
    // NB: preserve order for a deterministic output
    Map<Var, ExtensionElem> extElemMap = new LinkedHashMap<Var, ExtensionElem>();
    for (Var var : constructVars) {
        if (var.isAnonymous() && !extElemMap.containsKey(var)) {
            ValueExpr valueExpr;
            if (var.hasValue()) {
                valueExpr = new ValueConstant(var.getValue());
            } else {
                valueExpr = new BNodeGenerator();
            }
            extElemMap.put(var, new ExtensionElem(valueExpr, var.getName()));
        } else if (!whereClauseVarCollector.collectedVars.contains(var)) {
            // non-anon var in construct clause not present in where clause
            if (!extElemMap.containsKey(var)) {
                // assign non-anonymous vars not present in where clause as
                // extension elements. This is necessary to make external
                // binding
                // assingnment possible (see SES-996)
                extElemMap.put(var, new ExtensionElem(var, var.getName()));
            }
        }
    }
    if (!extElemMap.isEmpty()) {
        result = new Extension(result, extElemMap.values());
    }
    // Create a Projection for each StatementPattern in the constructor
    List<ProjectionElemList> projList = new ArrayList<ProjectionElemList>();
    for (StatementPattern sp : statementPatterns) {
        ProjectionElemList projElemList = new ProjectionElemList();
        projElemList.addElement(new ProjectionElem(sp.getSubjectVar().getName(), "subject"));
        projElemList.addElement(new ProjectionElem(sp.getPredicateVar().getName(), "predicate"));
        projElemList.addElement(new ProjectionElem(sp.getObjectVar().getName(), "object"));
        if (sp.getContextVar() != null) {
            projElemList.addElement(new ProjectionElem(sp.getContextVar().getName(), "context"));
        }
        projList.add(projElemList);
    }
    if (projList.size() == 1) {
        result = new Projection(result, projList.get(0));
    } else if (projList.size() > 1) {
        result = new MultiProjection(result, projList);
    } else {
        // Empty constructor
        result = new EmptySet();
    }
    return new Reduced(result);
}

Example 4 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class UpdateExprBuilder method getProjectionVars.

private Set<Var> getProjectionVars(Collection<StatementPattern> statementPatterns) {
    Set<Var> vars = new LinkedHashSet<Var>(statementPatterns.size() * 2);
    for (StatementPattern sp : statementPatterns) {
        vars.add(sp.getSubjectVar());
        vars.add(sp.getPredicateVar());
        vars.add(sp.getObjectVar());
        if (sp.getContextVar() != null) {
            vars.add(sp.getContextVar());
        }
    }
    return vars;
}

Example 5 with StatementPattern

use of org.eclipse.rdf4j.query.algebra.StatementPattern in project rdf4j by eclipse.

the class SPARQLParserTest method testSES1927UnequalLiteralValueConstants2.

@Test
public void testSES1927UnequalLiteralValueConstants2() throws Exception {
    StringBuilder qb = new StringBuilder();
    qb.append("ASK {?a <foo:bar> \"test\". ?a <foo:foo> \"test\"^^<foo:bar> .} ");
    ParsedQuery q = parser.parseQuery(qb.toString(), null);
    TupleExpr te = q.getTupleExpr();
    assertNotNull(te);
    assertTrue(te instanceof Slice);
    Slice s = (Slice) te;
    assertTrue(s.getArg() instanceof Join);
    Join j = (Join) s.getArg();
    assertTrue(j.getLeftArg() instanceof StatementPattern);
    assertTrue(j.getRightArg() instanceof StatementPattern);
    StatementPattern leftArg = (StatementPattern) j.getLeftArg();
    StatementPattern rightArg = (StatementPattern) j.getRightArg();
    assertFalse(leftArg.getObjectVar().equals(rightArg.getObjectVar()));
    assertNotEquals(leftArg.getObjectVar().getName(), rightArg.getObjectVar().getName());
}