Examples with Node org.apache.jena.graph.Node used on opensource projects

Example 71 with Node

use of org.apache.jena.graph.Node in project jena by apache.

the class PathEngineSPARQL method doFixedLengthPath.

@Override
protected void doFixedLengthPath(Path pathStep, Node node, long fixedLength, Collection<Node> output) {
    // Not SPARQL
    if (fixedLength == 0) {
        output.add(node);
        return;
    }
    // P_Mod(path, count, count)
    // One step.
    Iterator<Node> iter = eval(pathStep, node);
    // Build a path for all remaining steps.
    long count2 = dec(fixedLength);
    P_FixedLength nextPath = new P_FixedLength(pathStep, count2);
    // Accumulate across everything from first step.
    for (; iter.hasNext(); ) {
        Node n2 = iter.next();
        Iterator<Node> iter2 = eval(nextPath, n2);
        fill(iter2, output);
    }
}

Example 72 with Node

use of org.apache.jena.graph.Node in project jena by apache.

the class PathEngineSPARQL method doOneOrMoreN.

@Override
protected void doOneOrMoreN(Path pathStep, Node node, Collection<Node> output) {
    Set<Node> visited = new HashSet<>();
    // Do one step without including.
    Iterator<Node> iter1 = eval(pathStep, node);
    for (; iter1.hasNext(); ) {
        Node n1 = iter1.next();
        ALP_N(n1, pathStep, visited, output);
    }
}

Example 73 with Node

use of org.apache.jena.graph.Node in project jena by apache.

the class PropFuncArg method asExprList.

public ExprList asExprList() {
    ExprList exprList = new ExprList();
    if (isNode()) {
        Node n = getArg();
        Expr expr = ExprUtils.nodeToExpr(n);
        exprList.add(expr);
        return exprList;
    }
    for (Node n : getArgList()) {
        Expr expr = ExprUtils.nodeToExpr(n);
        exprList.add(expr);
    }
    return exprList;
}

Example 74 with Node

use of org.apache.jena.graph.Node in project jena by apache.

the class PathLib method evalGroundedPath.

// Subject and object are nodes.
private static QueryIterator evalGroundedPath(Binding binding, Graph graph, Node subject, Path path, Node object, ExecutionContext execCxt) {
    Iterator<Node> iter = PathEval.eval(graph, subject, path, execCxt.getContext());
    // Now count the number of matches.
    int count = 0;
    for (; iter.hasNext(); ) {
        Node n = iter.next();
        if (n.sameValueAs(object))
            count++;
    }
    return new QueryIterYieldN(count, binding, execCxt);
}

Example 75 with Node

use of org.apache.jena.graph.Node in project jena by apache.

the class listIndex method execOneList.

@Override
protected QueryIterator execOneList(Binding binding, Node listNode, Node predicate, List<Node> objectArgs, ExecutionContext execCxt) {
    if (Var.isVar(listNode))
        throw new ExprEvalException("ListIndex : subject not a list or variable bound to a list");
    if (objectArgs.size() != 2)
        throw new ExprEvalException("ListIndex : object not a list of length 2");
    Node indexNode = objectArgs.get(0);
    Node memberNode = objectArgs.get(1);
    Graph graph = execCxt.getActiveGraph();
    if (Var.isVar(indexNode) && !Var.isVar(memberNode))
        return findIndex(graph, binding, listNode, Var.alloc(indexNode), memberNode, execCxt);
    if (!Var.isVar(indexNode) && Var.isVar(memberNode))
        return getByIndex(graph, binding, listNode, indexNode, Var.alloc(memberNode), execCxt);
    if (!Var.isVar(indexNode) && !Var.isVar(memberNode))
        return testSlotValue(graph, binding, listNode, indexNode, memberNode, execCxt);
    return findIndexMember(graph, binding, listNode, Var.alloc(indexNode), Var.alloc(memberNode), execCxt);
}