public NodeSet CreateNodeSet(object key, XQueryExprBase[] path)
{
List<DmNode> nodes = new List<DmNode>();
GetNodesVisitor(path, this, 0, path.Length, nodes);
NodeSet res = new NodeSet(nodes);
if (_cached_set == null)
_cached_set = new Dictionary<object, NodeSet>();
_cached_set.Add(key, res);
return res;
}
private void GetNodesVisitor(XQueryExprBase[] path, DmNode curr, int index, int length, List<DmNode> res)
{
XQueryStepExpr expr = path[index] as XQueryStepExpr;
if (expr == null)
throw new ArgumentException();
DmNode[] nodes;
switch (expr.ExprType)
{
case XQueryPathExprType.Self:
nodes = curr.GetSelf();
break;
case XQueryPathExprType.Child:
nodes = curr.GetChilds();
break;
case XQueryPathExprType.Descendant:
nodes = curr.GetDescendants();
break;
case XQueryPathExprType.DescendantOrSelf:
nodes = curr.GetDescendantOrSelf();
break;
default:
throw new ArgumentException();
}
foreach (DmNode node in nodes)
if (node.TestNode(expr.NameTest, expr.TypeTest))
{
if (index < length -1)
GetNodesVisitor(path, node, index + 1, length, res);
else
res.Add(node);
}
}
