private static bool IsContainedBy(ISubGraphModel model, Object p, Object part) { // model will not be an ILinksModel
if (p == null || part == null) return false;
Object sg = model.GetGroupForNode(p);
if (sg == null) return false;
if (sg == part) return true;
if (IsContainedBy(model, sg, part)) return true;
return false;
}
private static Object CommonSubGraph(ISubGraphModel model, Object a, Object b) { // model will not be an ILinksModel
if (a == null) return null;
if (b == null) return null;
Object asg = model.GetGroupForNode(a);
if (asg == null) return null;
if (a == b) return asg;
Object bsg = model.GetGroupForNode(b);
if (bsg == null) return null;
if (asg == bsg) return bsg;
if (IsContainedBy(model, b, asg)) return asg;
if (IsContainedBy(model, a, bsg)) return bsg;
return CommonSubGraph(model, asg, bsg);
}