} else if (n instanceof Host) {
try {
if (_graphManager.getType() == GraphTypes.Directed)
v = _graphManager.addVertex(new DirectedSparseVertex(), ((Host)n).getName());
else if (_graphManager.getType() == GraphTypes.UnDirected) {
v = _graphManager.addVertex(new UndirectedSparseVertex(), ((Host)n).getName());
}
v.setUserDatum("host", (Host)n, UserData.CLONE);
} catch (UniqueLabelException ule) {}
} else if (n instanceof ErrorMapper) {
ErrorMapper err = (ErrorMapper)n;