@Override
protected QueryIterator processMethod() throws AsyncException {
// subject a variable.
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);
final Collection<Node> x;
if (!Var.isVar(memberNode))
// If memberNode is defined, find lists containing it.
x =
GraphList.listFromMember(
getHandler("x"), new GNode(execCxt.getActiveGraph(), memberNode));
else
// Hard. Subject unbound, no fixed member. Find every list and use BFI.
x = GraphList.findAllLists(getHandler("x"), execCxt.getActiveGraph());
return listIndex.super.allLists(
getHandler(""),
binding,
x,
listVar,
predicate,
new PropFuncArg(objectArgs, null),
execCxt);
}
@Override
protected QueryIterator processMethod() throws AsyncException {
// Find index of member.
int i = GraphList.index(getHandler("i"), new GNode(graph, listNode), member);
if (i < 0) return IterLib.noResults(execCxt);
Node idx = NodeFactory.intToNode(i);
return IterLib.oneResult(binding, var, idx, execCxt);
}
@Override
protected QueryIterator processMethod() throws AsyncException {
// Iterate over list
List<Node> members = GraphList.members(getHandler("members"), new GNode(graph, listNode));
List<Binding> bindings = new ArrayList<Binding>();
for (int i = 0; i < members.size(); i++) {
Node idx = NodeFactory.intToNode(i);
Node member = members.get(i);
BindingMap b = BindingFactory.create(binding);
b.add(varIndex, idx);
b.add(varMember, member);
bindings.add(b);
}
return new QueryIterPlainWrapper(bindings.iterator(), execCxt);
}
