getting information of new added/deleted edges

[<mhn.namak AT gmail.com>]

Hi all,
I want to use "graphstream" software to get a synthetic graph stream. However,
I don't need to visualize it. I just want to get the new edges/nodes per
request or in a batch mode.

My requirement is like the following:
- the graph model (e.g. BarabasiAlbert, ....)
- number of node/edges in total.
- streaming of edges in an ordered manner

The following code gives me the graph. However, in each event, I don't know
what are the new edges to have their order.
Is there any method that I can use to see what is the srcNodeId --> destNodeId
of the next streaming edge?

Graph graph = new SingleGraph("test1");
                Generator generator = new
BarabasiAlbertGenerator(maxEdgePerEvent);

                generator.addSink(graph);
                generator.begin();

        
                for (int i = 0; i < numberOfNodes; i++) {
                        generator.nextEvents(); //which edges/nodes were 
added?
                }

                
                for (Node node : graph) {
                        node.addAttribute("ui.label", node.getId());
                }

Thanks