void add(Node gNode, Node node) {
NodeTable gt = graph.get(gNode);
if (gt == null) {
gt = new NodeTable();
graph.put(gNode, gt);
}
if (!gt.containsKey(node)) {
gt.put(node, EntityImpl.create(gNode, node));
}
}
Iterable<Entity> getNodes(Node gNode) {
NodeTable gt = graph.get(gNode);
if (gt == null) return new ArrayList<Entity>();
return gt.values();
}
