fix for graph generation

src/de/tud/kom/p2psim/impl/topology/DefaultTopologyComponent.java

@@ -519,6 +519,11 @@ public class DefaultTopologyComponent implements TopologyComponent {
 			if (isDistanceBased) {
 				// Build neighbors solely based on an assumed range
 				for (MacLayer mac : topoView.getAllMacs()) {
+					//Fix Christoph Storm:
+					// Do not take offline nodes into account, unless told to do so...
+					if(onlyOnline && !currentView.containsNode(mac.getHost().getId())){
+						continue;
+					}
 					// Consider all nodes as potential neighbors
 					for (MacLayer neighborMac : topoView.getAllMacs()) {
 						// create, but do NOT add the node object
@@ -541,6 +546,11 @@ public class DefaultTopologyComponent implements TopologyComponent {
 			} else {
 				// Build neighborhoods based on underlay neighbors (1-hop)
 				for (MacLayer mac : topoView.getAllMacs()) {
+					// Fix Christoph Storm:
+					// Do not take offline nodes into account, unless told to do so...
+					if(onlyOnline && !currentView.containsNode(mac.getHost().getId())){
+						continue;
+					}
 					// Rely on underlay for neighbors
 					List<MacAddress> neighbors = topoView
 							.getNeighbors(mac.getMacAddress());