Examples with Aggregator org.apache.jena.sparql.expr.aggregate.Aggregator used on opensource projects

Example 1 with Aggregator

use of org.apache.jena.sparql.expr.aggregate.Aggregator in project jena by apache.

the class ApplyTransformVisitor method visit.

@Override
public void visit(OpGroup opGroup) {
    boolean changed = false;
    VarExprList varExpr = opGroup.getGroupVars();
    VarExprList varExpr2 = collect(varExpr);
    if (varExpr != varExpr2)
        changed = true;
    List<ExprAggregator> aggs = opGroup.getAggregators();
    List<ExprAggregator> aggs2 = aggs;
    // And the aggregators...
    aggs2 = new ArrayList<>();
    for (ExprAggregator agg : aggs) {
        Aggregator aggregator = agg.getAggregator();
        Var v = agg.getVar();
        // Variable associated with the aggregate
        // Not .getExprVar()
        Expr eVar = agg.getAggVar();
        Expr eVar2 = transform(eVar);
        if (eVar != eVar2)
            changed = true;
        // The Aggregator expression
        ExprList e = aggregator.getExprList();
        ExprList e2 = e;
        if (e != null)
            // Null means "no relevant expression" e.g. COUNT(*)
            e2 = transform(e);
        if (e != e2)
            changed = true;
        Aggregator a2 = aggregator.copy(e2);
        aggs2.add(new ExprAggregator(eVar2.asVar(), a2));
    }
    OpGroup opGroup2 = opGroup;
    if (changed)
        opGroup2 = OpGroup.create(opGroup.getSubOp(), varExpr2, aggs2);
    visit1(opGroup2);
}

Example 2 with Aggregator

use of org.apache.jena.sparql.expr.aggregate.Aggregator in project jena by apache.

the class ExprAggregator method applyNodeTransform.

@Override
public ExprAggregator applyNodeTransform(NodeTransform transform) {
    // Can't rewrite this to a non-variable.
    Node node = transform.apply(var);
    if (!Var.isVar(node)) {
        Log.warn(this, "Attempt to convert an aggregation variable to a non-variable: ignored");
        node = var;
    }
    Var v = (Var) node;
    Aggregator agg = aggregator.copyTransform(transform);
    return new ExprAggregator(Var.alloc(node), agg);
}

Example 3 with Aggregator

use of org.apache.jena.sparql.expr.aggregate.Aggregator in project jena by apache.

the class ExprAggregator method copySubstitute.

@Override
public ExprAggregator copySubstitute(Binding binding) {
    Var v = var;
    Aggregator agg = aggregator;
    return new ExprAggregator(v, agg);
}