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

Example 26 with ValueExpr

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

the class TupleExprBuilder method visit.

@Override
public Object visit(ASTPropertyListPath propListNode, Object data) throws VisitorException {
    ValueExpr subject = (ValueExpr) data;
    ValueExpr verbPath = (ValueExpr) propListNode.getVerb().jjtAccept(this, data);
    if (verbPath instanceof Var) {
        @SuppressWarnings("unchecked") List<ValueExpr> objectList = (List<ValueExpr>) propListNode.getObjectList().jjtAccept(this, null);
        Var subjVar = mapValueExprToVar(subject);
        Var predVar = mapValueExprToVar(verbPath);
        for (ValueExpr object : objectList) {
            Var objVar = mapValueExprToVar(object);
            graphPattern.addRequiredSP(subjVar, predVar, objVar);
        }
    } else {
    // path is a single IRI or a more complex path. handled by the
    // visitor.
    }
    ASTPropertyListPath nextPropList = propListNode.getNextPropertyList();
    if (nextPropList != null) {
        nextPropList.jjtAccept(this, subject);
    }
    return null;
}

Example 27 with ValueExpr

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

the class TupleExprBuilder method createTupleExprForNegatedPropertySet.

private TupleExpr createTupleExprForNegatedPropertySet(NegatedPropertySet nps, int index) {
    Var subjVar = nps.getSubjectVar();
    Var predVar = createAnonVar();
    ValueExpr filterCondition = null;
    ValueExpr filterConditionInverse = null;
    // build (inverted) filter conditions for each negated path element.
    for (PropertySetElem elem : nps.getPropertySetElems()) {
        ValueConstant predicate = elem.getPredicate();
        if (elem.isInverse()) {
            Compare compare = new Compare(predVar, predicate, CompareOp.NE);
            if (filterConditionInverse == null) {
                filterConditionInverse = compare;
            } else {
                filterConditionInverse = new And(compare, filterConditionInverse);
            }
        } else {
            Compare compare = new Compare(predVar, predicate, CompareOp.NE);
            if (filterCondition == null) {
                filterCondition = compare;
            } else {
                filterCondition = new And(compare, filterCondition);
            }
        }
    }
    TupleExpr patternMatch = null;
    // one item)
    if (filterCondition != null) {
        for (ValueExpr objVar : nps.getObjectList()) {
            if (patternMatch == null) {
                patternMatch = new StatementPattern(nps.getScope(), subjVar, predVar, (Var) objVar, nps.getContextVar());
            } else {
                patternMatch = new Join(new StatementPattern(nps.getScope(), subjVar, predVar, (Var) objVar, nps.getContextVar()), patternMatch);
            }
        }
    }
    TupleExpr patternMatchInverse = null;
    // one item):
    if (filterConditionInverse != null) {
        for (ValueExpr objVar : nps.getObjectList()) {
            if (patternMatchInverse == null) {
                patternMatchInverse = new StatementPattern(nps.getScope(), (Var) objVar, predVar, subjVar, nps.getContextVar());
            } else {
                patternMatchInverse = new Join(new StatementPattern(nps.getScope(), (Var) objVar, predVar, subjVar, nps.getContextVar()), patternMatchInverse);
            }
        }
    }
    TupleExpr completeMatch = null;
    if (patternMatch != null) {
        completeMatch = new Filter(patternMatch, filterCondition);
    }
    if (patternMatchInverse != null) {
        if (completeMatch == null) {
            completeMatch = new Filter(patternMatchInverse, filterConditionInverse);
        } else {
            completeMatch = new Union(new Filter(patternMatchInverse, filterConditionInverse), completeMatch);
        }
    }
    return completeMatch;
}

Example 28 with ValueExpr

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

the class TupleExprBuilder method visit.

@Override
public Compare visit(ASTCompare node, Object data) throws VisitorException {
    ValueExpr leftArg = (ValueExpr) node.jjtGetChild(0).jjtAccept(this, null);
    ValueExpr rightArg = (ValueExpr) node.jjtGetChild(1).jjtAccept(this, null);
    return new Compare(leftArg, rightArg, node.getOperator());
}

Example 29 with ValueExpr

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

the class TupleExprBuilder method visit.

@Override
public Object visit(ASTAnd node, Object data) throws VisitorException {
    ValueExpr leftArg = (ValueExpr) node.jjtGetChild(0).jjtAccept(this, null);
    ValueExpr rightArg = (ValueExpr) node.jjtGetChild(1).jjtAccept(this, null);
    return new And(leftArg, rightArg);
}

Example 30 with ValueExpr

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

the class TupleExprBuilder method visit.

@Override
public Object visit(ASTLangMatches node, Object data) throws VisitorException {
    ValueExpr leftArg = (ValueExpr) node.jjtGetChild(0).jjtAccept(this, null);
    ValueExpr rightArg = (ValueExpr) node.jjtGetChild(1).jjtAccept(this, null);
    return new LangMatches(leftArg, rightArg);
}