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

Example 46 with ValueExpr

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

the class TupleExprBuilder method processHavingClause.

private TupleExpr processHavingClause(ASTHavingClause havingNode, TupleExpr tupleExpr, Group group) throws VisitorException {
    if (havingNode != null) {
        // create an implicit group
        if (group == null) {
            group = new Group(tupleExpr);
        }
        ValueExpr expr = (ValueExpr) havingNode.jjtGetChild(0).jjtAccept(this, tupleExpr);
        // retrieve any aggregate operators from the expression.
        AggregateCollector collector = new AggregateCollector();
        collector.meetOther(expr);
        // replace operator occurrences with an anonymous var, and alias it
        // to the group
        Extension extension = new Extension();
        for (AggregateOperator operator : collector.getOperators()) {
            Var var = createAnonVar();
            // replace occurrence of the operator in the filter expression
            // with the variable.
            AggregateOperatorReplacer replacer = new AggregateOperatorReplacer(operator, var);
            replacer.meetOther(expr);
            String alias = var.getName();
            // create an extension linking the operator to the variable
            // name.
            ExtensionElem pe = new ExtensionElem(operator, alias);
            extension.addElement(pe);
            // add the aggregate operator to the group.
            GroupElem ge = new GroupElem(alias, operator);
            // FIXME quite often the aggregate in the HAVING clause will be
            // a duplicate of an aggregate in the projection. We could
            // perhaps
            // optimize for that, to avoid having to evaluate twice.
            group.addGroupElement(ge);
        }
        extension.setArg(group);
        tupleExpr = new Filter(extension, expr);
    }
    return tupleExpr;
}

Example 47 with ValueExpr

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

the class TupleExprBuilder method visit.

@Override
public ValueExpr visit(ASTIn node, Object data) throws VisitorException {
    ValueExpr result = null;
    ValueExpr leftArg = (ValueExpr) data;
    int listItemCount = node.jjtGetNumChildren();
    if (listItemCount == 0) {
        result = new ValueConstant(BooleanLiteral.FALSE);
    } else if (listItemCount == 1) {
        ValueExpr arg = (ValueExpr) node.jjtGetChild(0).jjtAccept(this, null);
        result = new Compare(leftArg, arg, CompareOp.EQ);
    } else {
        ListMemberOperator listMemberOperator = new ListMemberOperator();
        listMemberOperator.addArgument(leftArg);
        for (int i = 0; i < listItemCount; i++) {
            ValueExpr arg = (ValueExpr) node.jjtGetChild(i).jjtAccept(this, null);
            listMemberOperator.addArgument(arg);
        }
        result = listMemberOperator;
    }
    return result;
}

Example 48 with ValueExpr

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

the class TupleExprBuilder method visit.

@Override
public Object visit(ASTGroupConcat node, Object data) throws VisitorException {
    ValueExpr ve = (ValueExpr) node.jjtGetChild(0).jjtAccept(this, data);
    GroupConcat gc = new GroupConcat(ve, node.isDistinct());
    if (node.jjtGetNumChildren() > 1) {
        ValueExpr separator = (ValueExpr) node.jjtGetChild(1).jjtAccept(this, data);
        gc.setSeparator(separator);
    }
    return gc;
}

Example 49 with ValueExpr

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

the class SerqlValueExprRenderer method meet.

/**
 * @inheritDoc
 */
@Override
public void meet(FunctionCall theOp) throws Exception {
    mBuffer.append(theOp.getURI()).append("(");
    boolean aFirst = true;
    for (ValueExpr aArg : theOp.getArgs()) {
        if (!aFirst) {
            mBuffer.append(", ");
        } else {
            aFirst = false;
        }
        aArg.visit(this);
    }
    mBuffer.append(")");
}

Example 50 with ValueExpr

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

the class SparqlValueExprRenderer method meet.

/**
 * @inheritDoc
 */
@Override
public void meet(FunctionCall theOp) throws Exception {
    mBuffer.append("<").append(theOp.getURI()).append(">(");
    boolean aFirst = true;
    for (ValueExpr aArg : theOp.getArgs()) {
        if (!aFirst) {
            mBuffer.append(", ");
        } else {
            aFirst = false;
        }
        aArg.visit(this);
    }
    mBuffer.append(")");
}