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

Example 1 with TupleExpr

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

the class GraphPattern method addOptionalTE.

public void addOptionalTE(GraphPattern gp) {
    List<ValueExpr> constraints = gp.removeAllConstraints();
    TupleExpr tupleExpr = gp.buildTupleExpr();
    OptionalTupleExpr optTE;
    if (constraints.isEmpty()) {
        optTE = new OptionalTupleExpr(tupleExpr);
    } else {
        ValueExpr constraint = constraints.get(0);
        for (int i = 1; i < constraints.size(); i++) {
            constraint = new And(constraint, constraints.get(i));
        }
        optTE = new OptionalTupleExpr(tupleExpr, constraint);
    }
    optionalTEs.add(optTE);
}

Example 2 with TupleExpr

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

the class QueryModelBuilder method visit.

@Override
public TupleExpr visit(ASTSelectQuery node, Object data) throws VisitorException {
    TupleExpr tupleExpr;
    ASTQueryBody queryBodyNode = node.getQueryBody();
    if (queryBodyNode != null) {
        // Build tuple expression for query body
        tupleExpr = (TupleExpr) queryBodyNode.jjtAccept(this, null);
    } else {
        tupleExpr = new SingletonSet();
    }
    // Apply result ordering
    ASTOrderBy orderByNode = node.getOrderBy();
    if (orderByNode != null) {
        List<OrderElem> orderElemements = (List<OrderElem>) orderByNode.jjtAccept(this, null);
        tupleExpr = new Order(tupleExpr, orderElemements);
    }
    // Apply projection
    tupleExpr = (TupleExpr) node.getSelectClause().jjtAccept(this, tupleExpr);
    // process limit and offset clauses, if present.
    ASTLimit limitNode = node.getLimit();
    int limit = -1;
    if (limitNode != null) {
        limit = (Integer) limitNode.jjtAccept(this, null);
    }
    ASTOffset offsetNode = node.getOffset();
    int offset = -1;
    if (offsetNode != null) {
        offset = (Integer) offsetNode.jjtAccept(this, null);
    }
    if (offset >= 1 || limit >= 0) {
        tupleExpr = new Slice(tupleExpr, offset, limit);
    }
    return tupleExpr;
}

Example 3 with TupleExpr

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

the class QueryModelBuilder method visit.

@Override
public CompareAny visit(ASTCompareAny node, Object data) throws VisitorException {
    ValueExpr valueExpr = (ValueExpr) node.getLeftOperand().jjtAccept(this, null);
    TupleExpr tupleExpr = (TupleExpr) node.getRightOperand().jjtAccept(this, null);
    CompareOp op = node.getOperator().getValue();
    return new CompareAny(valueExpr, tupleExpr, op);
}

Example 4 with TupleExpr

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

the class QueryModelBuilder method visit.

@Override
public TupleExpr visit(ASTTupleIntersect node, Object data) throws VisitorException {
    TupleExpr leftArg = (TupleExpr) node.getLeftArg().jjtAccept(this, null);
    TupleExpr rightArg = (TupleExpr) node.getRightArg().jjtAccept(this, null);
    return new Intersection(leftArg, rightArg);
}

Example 5 with TupleExpr

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

the class QueryModelBuilder method visit.

@Override
public In visit(ASTIn node, Object data) throws VisitorException {
    ValueExpr valueExpr = (ValueExpr) node.getLeftOperand().jjtAccept(this, null);
    TupleExpr tupleExpr = (TupleExpr) node.getRightOperand().jjtAccept(this, null);
    return new In(valueExpr, tupleExpr);
}