Examples with Table org.apache.jena.sparql.algebra.Table used on opensource projects

Example 6 with Table

use of org.apache.jena.sparql.algebra.Table in project jena by apache.

the class Eval method evalGraph.

static Table evalGraph(OpGraph opGraph, Evaluator evaluator) {
    ExecutionContext execCxt = evaluator.getExecContext();
    if (!Var.isVar(opGraph.getNode())) {
        DatasetGraph dsg = execCxt.getDataset();
        Node graphNode = opGraph.getNode();
        if (!dsg.containsGraph(graphNode))
            return new TableEmpty();
        Graph graph = execCxt.getDataset().getGraph(opGraph.getNode());
        if (// But contains was true?!!
        graph == null)
            throw new InternalErrorException("Graph was present, now it's not");
        ExecutionContext execCxt2 = new ExecutionContext(execCxt, graph);
        Evaluator e2 = EvaluatorFactory.create(execCxt2);
        return eval(e2, opGraph.getSubOp());
    }
    // Graph node is a variable.
    Var gVar = Var.alloc(opGraph.getNode());
    Table current = null;
    for (Iterator<Node> iter = execCxt.getDataset().listGraphNodes(); iter.hasNext(); ) {
        Node gn = iter.next();
        Graph graph = execCxt.getDataset().getGraph(gn);
        ExecutionContext execCxt2 = new ExecutionContext(execCxt, graph);
        Evaluator e2 = EvaluatorFactory.create(execCxt2);
        Table tableVarURI = TableFactory.create(gVar, gn);
        // Evaluate the pattern, join with this graph node possibility.
        // XXX If Var.ANON then no-opt.
        Table patternTable = eval(e2, opGraph.getSubOp());
        Table stepResult = evaluator.join(patternTable, tableVarURI);
        if (current == null)
            current = stepResult;
        else
            current = evaluator.union(current, stepResult);
    }
    if (current == null)
        // Nothing to loop over
        return new TableEmpty();
    return current;
}

Example 7 with Table

use of org.apache.jena.sparql.algebra.Table in project jena by apache.

the class Eval method eval.

public static Table eval(Evaluator evaluator, Op op) {
    EvaluatorDispatch ev = new EvaluatorDispatch(evaluator);
    op.visit(ev);
    Table table = ev.getResult();
    return table;
}

Example 8 with Table

use of org.apache.jena.sparql.algebra.Table in project jena by apache.

the class EvaluatorDispatch method visit.

@Override
public void visit(OpFilter opFilter) {
    Table table = eval(opFilter.getSubOp());
    table = evaluator.filter(opFilter.getExprs(), table);
    push(table);
}

Example 9 with Table

use of org.apache.jena.sparql.algebra.Table in project jena by apache.

the class EvaluatorDispatch method visit.

@Override
public void visit(OpTopN opTop) {
    Table table = eval(opTop.getSubOp());
    //table = evaluator.topN(table, opTop.getLimti(), opTop.getConditions()) ;
    table = evaluator.order(table, opTop.getConditions());
    table = evaluator.slice(table, 0, opTop.getLimit());
    push(table);
}

Example 10 with Table

use of org.apache.jena.sparql.algebra.Table in project jena by apache.

the class EvaluatorDispatch method visit.

@Override
public void visit(OpOrder opOrder) {
    Table table = eval(opOrder.getSubOp());
    table = evaluator.order(table, opOrder.getConditions());
    push(table);
}