private QueryIterator length(
Binding binding, Graph graph, Node listNode, Var varLength, ExecutionContext execCxt) {
int x = GraphList.length(new GNode(graph, listNode));
if (x < 0) return IterLib.noResults(execCxt);
Node n = NodeFactoryExtra.intToNode(x);
return IterLib.oneResult(binding, varLength, n, execCxt);
}
private QueryIterator verify(
Binding binding, Graph graph, Node listNode, Node length, ExecutionContext execCxt) {
int x = GraphList.length(new GNode(graph, listNode));
int len = NodeFactoryExtra.nodeToInt(length);
if (x == len) return IterLib.result(binding, execCxt);
return IterLib.noResults(execCxt);
}
// Remove all triples associated with this magic property.
// Make an instance record.
private static PropertyFunctionInstance magicProperty(
Context context, Triple pfTriple, BasicPattern triples) {
List<Triple> listTriples = new ArrayList<>();
GNode sGNode = new GNode(triples, pfTriple.getSubject());
GNode oGNode = new GNode(triples, pfTriple.getObject());
List<Node> sList = null;
List<Node> oList = null;
if (GraphList.isListNode(sGNode)) {
sList = GraphList.members(sGNode);
GraphList.allTriples(sGNode, listTriples);
}
if (GraphList.isListNode(oGNode)) {
oList = GraphList.members(oGNode);
GraphList.allTriples(oGNode, listTriples);
}
PropFuncArg subjArgs = new PropFuncArg(sList, pfTriple.getSubject());
PropFuncArg objArgs = new PropFuncArg(oList, pfTriple.getObject());
// Confuses single arg with a list of one.
PropertyFunctionInstance pfi =
new PropertyFunctionInstance(subjArgs, pfTriple.getPredicate(), objArgs);
triples.getList().removeAll(listTriples);
return pfi;
}
