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

Example 36 with TupleExpr

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

the class QueryModelBuilder method visit.

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

Example 37 with TupleExpr

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

the class QueryModelBuilder method visit.

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

Example 38 with TupleExpr

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

the class QueryModelBuilder method visit.

@Override
public TupleExpr visit(ASTConstructQuery node, Object data) throws VisitorException {
    TupleExpr tupleExpr;
    if (node.hasQueryBody()) {
        // Build tuple expression for query body
        tupleExpr = (TupleExpr) node.getQueryBody().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);
    }
    // Create constructor
    ConstructorBuilder cb = new ConstructorBuilder();
    ASTConstruct constructNode = node.getConstructClause();
    if (!constructNode.isWildcard()) {
        TupleExpr constructExpr = (TupleExpr) constructNode.jjtAccept(this, null);
        tupleExpr = cb.buildConstructor(tupleExpr, constructExpr, constructNode.isDistinct(), constructNode.isReduced());
    } else if (node.hasQueryBody()) {
        tupleExpr = cb.buildConstructor(tupleExpr, constructNode.isDistinct(), constructNode.isReduced());
    }
    // else: "construct *" without query body, just return the SingletonSet
    // 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 39 with TupleExpr

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

the class QueryModelBuilder method visit.

@Override
public TupleExpr visit(ASTTupleUnion node, Object data) throws VisitorException {
    TupleExpr leftArg = (TupleExpr) node.getLeftArg().jjtAccept(this, null);
    TupleExpr rightArg = (TupleExpr) node.getRightArg().jjtAccept(this, null);
    TupleExpr result = new Union(leftArg, rightArg);
    if (node.isDistinct()) {
        result = new Distinct(result);
    }
    return result;
}

Example 40 with TupleExpr

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

the class QueryModelBuilder method visit.

@Override
public TupleExpr visit(ASTSelect node, Object data) throws VisitorException {
    TupleExpr result = (TupleExpr) data;
    Extension extension = new Extension();
    ProjectionElemList projElemList = new ProjectionElemList();
    for (ASTProjectionElem projElemNode : node.getProjectionElemList()) {
        ValueExpr valueExpr = (ValueExpr) projElemNode.getValueExpr().jjtAccept(this, null);
        String alias = projElemNode.getAlias();
        if (alias != null) {
            // aliased projection element
            extension.addElement(new ExtensionElem(valueExpr, alias));
            projElemList.addElement(new ProjectionElem(alias));
        } else if (valueExpr instanceof Var) {
            // unaliased variable
            Var projVar = (Var) valueExpr;
            projElemList.addElement(new ProjectionElem(projVar.getName()));
        } else {
            throw new IllegalStateException("required alias for non-Var projection elements not found");
        }
    }
    if (!extension.getElements().isEmpty()) {
        extension.setArg(result);
        result = extension;
    }
    result = new Projection(result, projElemList);
    if (node.isDistinct()) {
        result = new Distinct(result);
    } else if (node.isReduced()) {
        result = new Reduced(result);
    }
    return result;
}