protected int getIndex(Graph<V, E> graph, E e, V v) {
Collection<E> commonEdgeSet = new HashSet<E>();
for (E another : graph.getIncidentEdges(v)) {
V u = graph.getOpposite(v, another);
if (u.equals(v)) {
commonEdgeSet.add(another);
}
}
int count = 0;
for (E other : commonEdgeSet) {
if (e.equals(other) == false) {
edge_index.put(other, count);
count++;
}
}
edge_index.put(e, count);
return count;
}
protected void computeBetweenness(Queue<V> queue, Transformer<E, ? extends Number> edge_weights) {
for (V v : graph.getVertices()) {
// initialize the betweenness data for this new vertex
for (V s : graph.getVertices()) this.vertex_data.put(s, new BetweennessData());
// if (v.equals(new Integer(0)))
// System.out.println("pause");
vertex_data.get(v).numSPs = 1;
vertex_data.get(v).distance = 0;
Stack<V> stack = new Stack<V>();
// Buffer<V> queue = new UnboundedFifoBuffer<V>();
// queue.add(v);
queue.offer(v);
while (!queue.isEmpty()) {
// V w = queue.remove();
V w = queue.poll();
stack.push(w);
BetweennessData w_data = vertex_data.get(w);
for (E e : graph.getOutEdges(w)) {
// TODO (jrtom): change this to getOtherVertices(w, e)
V x = graph.getOpposite(w, e);
if (x.equals(w)) continue;
double wx_weight = edge_weights.transform(e).doubleValue();
// for(V x : graph.getSuccessors(w))
// {
// if (x.equals(w))
// continue;
// FIXME: the other problem is that I need to
// keep putting the neighbors of things we've just
// discovered in the queue, if they're undiscovered or
// at greater distance.
// FIXME: this is the problem, right here, I think:
// need to update position in queue if distance changes
// (which can only happen with weighted edges).
// for each outgoing edge e from w, get other end x
// if x not already visited (dist x < 0)
// set x's distance to w's dist + edge weight
// add x to queue; pri in queue is x's dist
// if w's dist + edge weight < x's dist
// update x's dist
// update x in queue (MapBinaryHeap)
// clear x's incoming edge list
// if w's dist + edge weight = x's dist
// add e to x's incoming edge list
BetweennessData x_data = vertex_data.get(x);
double x_potential_dist = w_data.distance + wx_weight;
if (x_data.distance < 0) {
// queue.add(x);
// vertex_data.get(x).distance =
// vertex_data.get(w).distance + 1;
x_data.distance = x_potential_dist;
queue.offer(x);
}
// note:
// (1) this can only happen with weighted edges
// (2) x's SP count and incoming edges are updated below
if (x_data.distance > x_potential_dist) {
x_data.distance = x_potential_dist;
// invalidate previously identified incoming edges
// (we have a new shortest path distance to x)
x_data.incomingEdges.clear();
// update x's position in queue
((MapBinaryHeap<V>) queue).update(x);
}
// if (vertex_data.get(x).distance ==
// vertex_data.get(w).distance + 1)
//
// if (x_data.distance == x_potential_dist)
// {
// x_data.numSPs += w_data.numSPs;
//// vertex_data.get(x).predecessors.add(w);
// x_data.incomingEdges.add(e);
// }
}
for (E e : graph.getOutEdges(w)) {
V x = graph.getOpposite(w, e);
if (x.equals(w)) continue;
double e_weight = edge_weights.transform(e).doubleValue();
BetweennessData x_data = vertex_data.get(x);
double x_potential_dist = w_data.distance + e_weight;
if (x_data.distance == x_potential_dist) {
x_data.numSPs += w_data.numSPs;
// vertex_data.get(x).predecessors.add(w);
x_data.incomingEdges.add(e);
}
}
}
while (!stack.isEmpty()) {
V x = stack.pop();
// for (V w : vertex_data.get(x).predecessors)
for (E e : vertex_data.get(x).incomingEdges) {
V w = graph.getOpposite(x, e);
double partialDependency =
vertex_data.get(w).numSPs
/ vertex_data.get(x).numSPs
* (1.0 + vertex_data.get(x).dependency);
vertex_data.get(w).dependency += partialDependency;
// E w_x = graph.findEdge(w, x);
// double w_x_score = edge_scores.get(w_x).doubleValue();
// w_x_score += partialDependency;
// edge_scores.put(w_x, w_x_score);
double e_score = edge_scores.get(e).doubleValue();
edge_scores.put(e, e_score + partialDependency);
}
if (!x.equals(v)) {
double x_score = vertex_scores.get(x).doubleValue();
x_score += vertex_data.get(x).dependency;
vertex_scores.put(x, x_score);
}
}
}
if (graph instanceof UndirectedGraph) {
for (V v : graph.getVertices()) {
double v_score = vertex_scores.get(v).doubleValue();
v_score /= 2.0;
vertex_scores.put(v, v_score);
}
for (E e : graph.getEdges()) {
double e_score = edge_scores.get(e).doubleValue();
e_score /= 2.0;
edge_scores.put(e, e_score);
}
}
vertex_data.clear();
}