private int dfsVisit(PackInfo u, Map names, Map edges) {
u.colour = PackInfo.GREY;
List deps = u.getDependencies();
if (deps != null) {
for (int i = 0; i < deps.size(); i++) {
String name = (String) deps.get(i);
PackInfo v = (PackInfo) names.get(name);
if (v == null) {
System.out.println("Failed to find dependency: " + name);
return -1;
}
Edge edge = new Edge(u, v);
if (edges.get(edge) == null) edges.put(edge, new Integer(v.colour));
if (v.colour == PackInfo.WHITE) {
final int result = dfsVisit(v, names, edges);
if (result != 0) return result;
}
}
}
u.colour = PackInfo.BLACK;
return 0;
}
