private boolean depthFirstSearchRecursive(
VertexType vertex, VertexType fromVertex, PreWorkPostWorkHandler<VertexType> handler)
throws InvalidVertexException {
// TODO:Implementing non-recursive version
// int vertexId = vertex.getId();
vertex.setMark(true);
if (handler != null) if (handler.doPreWork(fromVertex, vertex)) return true;
dispatchEvent(new PreWorkEvent<VertexType, EdgeType>(fromVertex, vertex, graph));
EventUtils.algorithmStep(this, "visit: " + vertex.getId());
VertexType lastInDepthVertex = vertex;
for (VertexType i : graph) {
if (graph.isEdge(vertex, i)) {
if (!i.getMark()) {
lastInDepthVertex = i;
if (depthFirstSearchRecursive(i, vertex, handler)) return true;
}
}
}
dispatchEvent(new PostWorkEvent<VertexType, EdgeType>(lastInDepthVertex, vertex, graph));
EventUtils.algorithmStep(this, "leave: " + vertex.getId());
if (handler != null) if (handler.doPostWork(lastInDepthVertex, vertex)) return true;
return false;
}
/**
* A wrapper for getting vertex Id's which supports multiple vertex owners.
*
* @param v Vertex which the caller intends to get its Id.
* @return The Id.
*/
protected int getId(VertexType v) {
if (subgraphIndex != 0) {
return v.getSubgraphId(subgraphIndex);
}
return v.getId();
}
public Vector<VertexType> acyclicSP(BaseGraph<VertexType, EdgeType> g, VertexType v)
throws InvalidVertexException {
BaseGraph<VertexType, EdgeType> gcopy = g.copy(gc);
final Integer dist[] = new Integer[g.getVerticesCount()];
Vector<VertexType> prev = new Vector<VertexType>();
Queue<VertexType> Q = new LinkedList<VertexType>();
HashMap<VertexType, VertexType> gcopy2g = new HashMap<VertexType, VertexType>();
HashMap<Integer, VertexType> t = new HashMap<Integer, VertexType>();
for (VertexType type : gcopy) t.put(type.getId(), type);
for (VertexType type : g) gcopy2g.put(t.get(type.getId()), type);
for (int i = 0; i < dist.length; i++) dist[i] = Integer.MAX_VALUE;
dist[v.getId()] = 0;
for (VertexType u : gcopy) {
if (gcopy.getInDegree(u) == 0) {
Q.add(u);
}
}
while (!Q.isEmpty()) {
VertexType u = Q.poll();
Iterator<EdgeType> iet = gcopy.edgeIterator(u);
while (iet.hasNext()) {
EdgeType e = iet.next();
if ((dist[u.getId()] + e.getWeight()) < dist[e.target.getId()]) {
dist[e.target.getId()] = dist[u.getId()] + e.getWeight();
prev.add(e.target.getId(), u);
dispatchEvent(
new PreWorkEvent<VertexType, EdgeType>(gcopy2g.get(e.target), gcopy2g.get(u), gcopy));
// System.out.println(e.target.getId());
}
if (gcopy.getInDegree((VertexType) e.target) == 1) Q.add((VertexType) e.target);
}
gcopy.removeVertex(u);
}
return prev;
}
