public void testTransfers() throws Exception {
TransferTable transferTable = graph.getTransferTable();
// create dummy routes and trips
Route fromRoute = new Route();
fromRoute.setId(new AgencyAndId("agency", "1"));
Trip fromTrip = new Trip();
fromTrip.setId(new AgencyAndId("agency", "1.1"));
fromTrip.setRoute(fromRoute);
Route toRoute = new Route();
toRoute.setId(new AgencyAndId("agency", "2"));
Trip toTrip = new Trip();
toTrip.setId(new AgencyAndId("agency", "2.1"));
toTrip.setRoute(toRoute);
Trip toTrip2 = new Trip();
toTrip2.setId(new AgencyAndId("agency", "2.2"));
toTrip2.setRoute(toRoute);
// find stops
Stop stopK = ((TransitStopArrive) graph.getVertex("agency_K_arrive")).getStop();
Stop stopN = ((TransitStopDepart) graph.getVertex("agency_N_depart")).getStop();
Stop stopM = ((TransitStopDepart) graph.getVertex("agency_M_depart")).getStop();
assertTrue(transferTable.hasPreferredTransfers());
assertEquals(
StopTransfer.UNKNOWN_TRANSFER,
transferTable.getTransferTime(stopN, stopM, fromTrip, toTrip));
assertEquals(
StopTransfer.FORBIDDEN_TRANSFER,
transferTable.getTransferTime(stopK, stopM, fromTrip, toTrip));
assertEquals(
StopTransfer.PREFERRED_TRANSFER,
transferTable.getTransferTime(stopN, stopK, toTrip, toTrip2));
assertEquals(
StopTransfer.TIMED_TRANSFER, transferTable.getTransferTime(stopN, stopK, fromTrip, toTrip));
assertEquals(15, transferTable.getTransferTime(stopN, stopK, fromTrip, toTrip2));
Vertex e_arrive = graph.getVertex("agency_E_arrive");
Vertex f_depart = graph.getVertex("agency_F_depart");
Edge edge = new TransferEdge(e_arrive, f_depart, 10000, 10000);
long startTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 18, 0, 50, 0);
Vertex stop_b = graph.getVertex("agency_B_depart");
Vertex stop_g = graph.getVertex("agency_G_arrive");
RoutingRequest options = new RoutingRequest();
options.dateTime = startTime;
options.setRoutingContext(graph, stop_b, stop_g);
ShortestPathTree spt = aStar.getShortestPathTree(options);
GraphPath path = spt.getPath(stop_g, false);
assertNotNull(path);
assertTrue(
"expected to use much later trip due to min transfer time",
path.getEndTime() - startTime > 4.5 * 60 * 60);
/* cleanup */
e_arrive.removeOutgoing(edge);
f_depart.removeIncoming(edge);
}
public synchronized void initIndexes() {
if (vertexIndex != null) {
return;
}
graphService.setLoadLevel(LoadLevel.DEBUG);
Graph graph = graphService.getGraph();
vertexIndex = new STRtree();
edgeIndex = new STRtree();
for (Vertex v : graph.getVertices()) {
Envelope vertexEnvelope = new Envelope(v.getCoordinate());
vertexIndex.insert(vertexEnvelope, v);
for (Edge e : v.getOutgoing()) {
Envelope envelope;
Geometry geometry = e.getGeometry();
if (geometry == null) {
envelope = vertexEnvelope;
} else {
envelope = geometry.getEnvelopeInternal();
}
edgeIndex.insert(envelope, e);
}
}
vertexIndex.build();
edgeIndex.build();
}
/**
* The safest bike lane should have a safety weight no lower than the time weight of a flat
* street. This method divides the safety lengths by the length ratio of the safest street,
* ensuring this property.
*
* @param graph
*/
private void applyBikeSafetyFactor(Graph graph) {
_log.info(
GraphBuilderAnnotation.register(
graph,
Variety.GRAPHWIDE,
"Multiplying all bike safety values by " + (1 / bestBikeSafety)));
HashSet<Edge> seenEdges = new HashSet<Edge>();
for (Vertex vertex : graph.getVertices()) {
for (Edge e : vertex.getOutgoing()) {
if (!(e instanceof PlainStreetEdge)) {
continue;
}
PlainStreetEdge pse = (PlainStreetEdge) e;
if (!seenEdges.contains(e)) {
seenEdges.add(e);
pse.setBicycleSafetyEffectiveLength(
pse.getBicycleSafetyEffectiveLength() / bestBikeSafety);
}
}
for (Edge e : vertex.getIncoming()) {
if (!(e instanceof PlainStreetEdge)) {
continue;
}
PlainStreetEdge pse = (PlainStreetEdge) e;
if (!seenEdges.contains(e)) {
seenEdges.add(e);
pse.setBicycleSafetyEffectiveLength(
pse.getBicycleSafetyEffectiveLength() / bestBikeSafety);
}
}
}
}
public static int getPreviousArriveTime(
RoutingRequest request, int arrivalTime, Vertex stopVertex) {
int bestArrivalTime = -1;
request.arriveBy = true;
// find the alights
for (Edge prealight : stopVertex.getIncoming()) {
if (prealight instanceof PreAlightEdge) {
Vertex arrival = prealight.getFromVertex(); // this is the arrival vertex
for (Edge alight : arrival.getIncoming()) {
if (alight instanceof TransitBoardAlight) {
State state = new State(alight.getToVertex(), arrivalTime, request);
State result = alight.traverse(state);
if (result == null) continue;
int time = (int) result.getTime();
if (time > bestArrivalTime) {
bestArrivalTime = time;
}
}
}
}
}
request.arriveBy = false;
return bestArrivalTime;
}
public void testPickupDropoff() throws Exception {
Vertex stop_o = graph.getVertex("agency_O_depart");
Vertex stop_p = graph.getVertex("agency_P");
int i = 0;
for (@SuppressWarnings("unused") Edge e : stop_o.getOutgoing()) {
++i;
}
assertTrue(i == 3);
long startTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 19, 12, 0, 0);
RoutingRequest options = new RoutingRequest();
options.dateTime = startTime;
options.setRoutingContext(graph, stop_o, stop_p);
ShortestPathTree spt = aStar.getShortestPathTree(options);
GraphPath path = spt.getPath(stop_p, false);
assertNotNull(path);
long endTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 19, 12, 10, 0);
assertEquals(endTime, path.getEndTime());
startTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 19, 12, 0, 1);
options.dateTime = startTime;
options.setRoutingContext(graph, stop_o, stop_p);
spt = aStar.getShortestPathTree(options);
path = spt.getPath(stop_p, false);
assertNotNull(path);
endTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 19, 15, 10, 0);
assertEquals(endTime, path.getEndTime());
}
/**
* Tear down this routing context, removing any temporary edges.
*
* @returns the number of edges removed.
*/
public int destroy() {
int nRemoved = 0;
if (origin != null) nRemoved += origin.removeTemporaryEdges();
if (target != null) nRemoved += target.removeTemporaryEdges();
for (Vertex v : intermediateVertices) nRemoved += v.removeTemporaryEdges();
return nRemoved;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final InferredEdge other = (InferredEdge) obj;
if (endVertex == null) {
if (other.endVertex != null) {
return false;
}
} else if (!endVertex.equals(other.endVertex)) {
return false;
}
if (startVertex == null) {
if (other.startVertex != null) {
return false;
}
} else if (!startVertex.equals(other.startVertex)) {
return false;
}
return true;
}
/** Generates a TripPlan from a set of paths */
public TripPlan generatePlan(List<GraphPath> paths, RoutingRequest request) {
GraphPath exemplar = paths.get(0);
Vertex tripStartVertex = exemplar.getStartVertex();
Vertex tripEndVertex = exemplar.getEndVertex();
String startName = tripStartVertex.getName();
String endName = tripEndVertex.getName();
// Use vertex labels if they don't have names
if (startName == null) {
startName = tripStartVertex.getLabel();
}
if (endName == null) {
endName = tripEndVertex.getLabel();
}
Place from = new Place(tripStartVertex.getX(), tripStartVertex.getY(), startName);
Place to = new Place(tripEndVertex.getX(), tripEndVertex.getY(), endName);
TripPlan plan = new TripPlan(from, to, request.getDateTime());
for (GraphPath path : paths) {
Itinerary itinerary = generateItinerary(path, request.getShowIntermediateStops());
plan.addItinerary(itinerary);
}
return plan;
}
public void testRoutingOverMidnight() throws Exception {
// this route only runs on weekdays
Vertex stop_g = graph.getVertex("agency:G_depart");
Vertex stop_h = graph.getVertex("agency:H_arrive");
ShortestPathTree spt;
GraphPath path;
RoutingRequest options = new RoutingRequest();
// Friday evening
options.dateTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 18, 23, 20, 0);
options.setRoutingContext(graph, stop_g, stop_h);
spt = aStar.getShortestPathTree(options);
path = spt.getPath(stop_h, false);
assertNotNull(path);
assertEquals(4, path.states.size());
// Saturday morning
long startTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 19, 0, 5, 0);
options.dateTime = startTime;
options.setRoutingContext(graph, stop_g.getLabel(), stop_h.getLabel());
spt = aStar.getShortestPathTree(options);
path = spt.getPath(stop_h, false);
assertNotNull(path);
assertEquals(4, path.states.size());
long endTime = path.getEndTime();
assertTrue(endTime < startTime + 60 * 60);
}
public void drawAnotation(GraphBuilderAnnotation anno) {
Envelope env = new Envelope();
Edge e = anno.getReferencedEdge();
if (e != null) {
this.enqueueHighlightedEdge(e);
env.expandToInclude(e.getFromVertex().getCoordinate());
env.expandToInclude(e.getToVertex().getCoordinate());
}
ArrayList<Vertex> vertices = new ArrayList<Vertex>();
Vertex v = anno.getReferencedVertex();
if (v != null) {
env.expandToInclude(v.getCoordinate());
vertices.add(v);
}
if (e == null && v == null) return;
// make it a little bigger, especially needed for STOP_UNLINKED
env.expandBy(0.02);
// highlight relevant things
this.clearHighlights();
this.setHighlightedVertices(vertices);
// zoom the graph display
this.zoomToEnvelope(env);
// and draw
this.draw();
}
public static int getNextDepartTime(
RoutingRequest request, int departureTime, Vertex stopVertex) {
int bestArrivalTime = Integer.MAX_VALUE;
request.arriveBy = false;
// find the boards
for (Edge preboard : stopVertex.getOutgoing()) {
if (preboard instanceof PreBoardEdge) {
Vertex departure = preboard.getToVertex(); // this is the departure vertex
for (Edge board : departure.getOutgoing()) {
if (board instanceof TransitBoardAlight) {
State state = new State(board.getFromVertex(), departureTime, request);
State result = board.traverse(state);
if (result == null) continue;
int time = (int) result.getTime();
if (time < bestArrivalTime) {
bestArrivalTime = time;
}
}
}
}
}
request.arriveBy = true;
return bestArrivalTime;
}
public void testFrequencies() {
Vertex stop_u = graph.getVertex("agency_U_depart");
Vertex stop_v = graph.getVertex("agency_V_arrive");
ShortestPathTree spt;
GraphPath path;
RoutingRequest options = new RoutingRequest();
options.setModes(new TraverseModeSet("TRANSIT"));
options.dateTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 7, 0, 0, 0);
options.setRoutingContext(graph, stop_u, stop_v);
// U to V - original stop times - shouldn't be used
spt = aStar.getShortestPathTree(options);
path = spt.getPath(stop_v, false);
assertNotNull(path);
assertEquals(4, path.states.size());
long endTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 7, 6, 40, 0);
assertEquals(endTime, path.getEndTime());
// U to V - first frequency
options.dateTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 7, 7, 0, 0);
options.setRoutingContext(graph, stop_u, stop_v);
spt = aStar.getShortestPathTree(options);
path = spt.getPath(stop_v, false);
assertNotNull(path);
assertEquals(4, path.states.size());
endTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 7, 7, 40, 0);
assertEquals(endTime, path.getEndTime());
// U to V - second frequency
options.dateTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 7, 14, 0, 0);
options.setRoutingContext(graph, stop_u, stop_v);
spt = aStar.getShortestPathTree(options);
path = spt.getPath(stop_v, false);
assertNotNull(path);
assertEquals(4, path.states.size());
endTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 7, 14, 40, 0);
assertEquals(endTime, path.getEndTime());
boolean boarded = false;
for (FrequencyBoard e : filter(stop_u.getOutgoing(), FrequencyBoard.class)) {
boarded = true;
FrequencyBoard board = (FrequencyBoard) e;
FrequencyBasedTripPattern pattern = board.getPattern();
int previousArrivalTime = pattern.getPreviousArrivalTime(0, 0, false, false, false);
assertTrue(previousArrivalTime < 0);
previousArrivalTime = pattern.getPreviousArrivalTime(0, 60 * 60 * 7 - 1, false, false, false);
assertEquals(60 * 60 * 6, previousArrivalTime);
previousArrivalTime = pattern.getPreviousArrivalTime(0, 60 * 60 * 11, false, false, false);
assertEquals(60 * 60 * 10, previousArrivalTime);
previousArrivalTime = pattern.getPreviousArrivalTime(0, 60 * 60 * 18, false, false, false);
assertEquals(60 * 60 * 16, previousArrivalTime);
}
assertTrue(boarded);
}
private Vertex getVertexByCrossStreets(String s1, String s2) {
for (Vertex v : Context.getInstance().graph.getVertices()) {
if (v.getName().contains(s1) && v.getName().contains(s2)) {
return v;
}
}
return null;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((endVertex == null) ? 0 : endVertex.hashCode());
result = prime * result + ((startVertex == null) ? 0 : startVertex.hashCode());
return result;
}
public static DisjointSet<Vertex> getConnectedComponents(Graph graph) {
DisjointSet<Vertex> components = new DisjointSet<Vertex>();
for (Vertex v : graph.getVertices()) {
for (Edge e : v.getOutgoing()) {
components.union(e.getFromVertex(), e.getToVertex());
}
}
return components;
}
public void testBoardAlight() throws Exception {
Vertex stop_a_depart = graph.getVertex("agency:A_depart");
Vertex stop_b_depart = graph.getVertex("agency:B_depart");
assertEquals(1, stop_a_depart.getDegreeOut());
assertEquals(3, stop_b_depart.getDegreeOut());
for (Edge e : stop_a_depart.getOutgoing()) {
assertEquals(TransitBoardAlight.class, e.getClass());
assertTrue(((TransitBoardAlight) e).boarding);
}
TransitBoardAlight pb = (TransitBoardAlight) stop_a_depart.getOutgoing().iterator().next();
Vertex journey_a_1 = pb.getToVertex();
assertEquals(1, journey_a_1.getDegreeIn());
for (Edge e : journey_a_1.getOutgoing()) {
if (e.getToVertex() instanceof TransitStop) {
assertEquals(TransitBoardAlight.class, e.getClass());
} else {
assertEquals(PatternHop.class, e.getClass());
}
}
}
public void testWheelchairAccessible() throws Exception {
Vertex near_a = graph.getVertex("near_1_agency_entrance_a");
Vertex near_b = graph.getVertex("near_1_agency_entrance_b");
Vertex near_c = graph.getVertex("near_1_agency_C");
Vertex near_e = graph.getVertex("near_1_agency_E");
Vertex stop_d = graph.getVertex("agency:D");
Vertex split_d = null;
for (StreetTransitLink e : Iterables.filter(stop_d.getOutgoing(), StreetTransitLink.class)) {
split_d = e.getToVertex();
}
RoutingRequest options = new RoutingRequest();
options.wheelchairAccessible = true;
options.dateTime = TestUtils.dateInSeconds("America/New_York", 2009, 8, 18, 0, 0, 0);
ShortestPathTree spt;
GraphPath path;
// stop B is accessible, so there should be a path.
options.setRoutingContext(graph, near_a, near_b);
spt = aStar.getShortestPathTree(options);
path = spt.getPath(near_b, false);
assertNotNull(path);
// stop C is not accessible, so there should be no path.
options.setRoutingContext(graph, near_a, near_c);
spt = aStar.getShortestPathTree(options);
path = spt.getPath(near_c, false);
assertNull(path);
// stop E has no accessibility information, but we should still be able to route to it.
options.setRoutingContext(graph, near_a, near_e);
spt = aStar.getShortestPathTree(options);
path = spt.getPath(near_e, false);
assertNotNull(path);
// from stop A to stop D would normally be trip 1.1 to trip 2.1, arriving at 00:30. But trip
// 2 is not accessible, so we'll do 1.1 to 3.1, arriving at 01:00
GregorianCalendar time = new GregorianCalendar(2009, 8, 18, 0, 0, 0);
time.setTimeZone(TimeZone.getTimeZone("America/New_York"));
options.dateTime = TestUtils.toSeconds(time);
options.setRoutingContext(graph, near_a, split_d);
spt = aStar.getShortestPathTree(options);
time.add(Calendar.HOUR, 1);
time.add(Calendar.SECOND, 1); // for the StreetTransitLink
path = spt.getPath(split_d, false);
assertNotNull(path);
assertEquals(TestUtils.toSeconds(time), path.getEndTime());
}
public TargetBound(RoutingRequest options) {
this.options = options;
if (options.rctx.target != null) {
this.realTarget = options.rctx.target;
this.realTargetCoordinate = realTarget.getCoordinate();
this.distanceToNearestTransitStop = realTarget.getDistanceToNearestTransitStop();
bounders = new ArrayList<State>();
transitLocalStreets = options.rctx.graph.getService(TransitLocalStreetService.class);
speedUpperBound = options.getSpeedUpperBound();
this.speedWeight = options.getWalkReluctance() / speedUpperBound;
this.transferTimeInWalkDistance = options.getTransferSlack() / options.getWalkSpeed();
}
}
public void reset(RoutingRequest options) {
this.options = options;
if (realTarget != options.rctx.target) {
this.realTarget = options.rctx.target;
this.realTargetCoordinate = realTarget.getCoordinate();
this.distanceToNearestTransitStop = realTarget.getDistanceToNearestTransitStop();
bounders = new ArrayList<State>();
Arrays.fill(distance, -1);
}
spt = new ArrayMultiShortestPathTree(options);
transitLocalStreets = options.rctx.graph.getService(TransitLocalStreetService.class);
speedUpperBound = options.getSpeedUpperBound();
this.speedWeight = options.getWalkReluctance() / speedUpperBound;
}
/* Somewhat hackish convenience method to grab a hop edge on a particular route leaving a particular stop. */
private PatternHop getHopEdge(String stopId, String routeId) {
Vertex stopDepartVertex = graph.getVertex("agency:" + stopId + "_depart");
for (Edge edge : stopDepartVertex.getOutgoing()) {
if (edge instanceof TransitBoardAlight) {
TransitBoardAlight tba = ((TransitBoardAlight) edge);
if (tba.boarding && tba.getPattern().route.getId().getId().equals(routeId)) {
for (Edge edge2 : tba.getToVertex().getOutgoing()) {
if (edge2 instanceof PatternHop) {
return (PatternHop) edge2;
}
}
}
}
}
return null;
}
public void testBoardAlightStopIndex() {
Vertex stop_b_arrive = graph.getVertex("agency:C_arrive");
Vertex stop_b_depart = graph.getVertex("agency:C_depart");
Map<TripPattern, Integer> stopIndex = new HashMap<TripPattern, Integer>();
for (Edge edge : stop_b_depart.getOutgoing()) {
TransitBoardAlight tba = (TransitBoardAlight) edge;
stopIndex.put(tba.getPattern(), tba.getStopIndex());
}
for (Edge edge : stop_b_arrive.getIncoming()) {
TransitBoardAlight tba = (TransitBoardAlight) edge;
if (stopIndex.containsKey(tba.getPattern()))
assertEquals((Integer) stopIndex.get(tba.getPattern()), new Integer(tba.getStopIndex()));
}
}
public void zoomToVertex(Vertex v) {
Envelope e = new Envelope();
e.expandToInclude(v.getCoordinate());
e.expandBy(0.002);
modelBounds = e;
drawLevel = DRAW_ALL;
}
private void labelState(State s, String str) {
fill(240, 240, 240);
Vertex v = s.getVertex();
drawVertex(v, 8);
str += " " + shortDateFormat.format(new Date(s.getTime() * 1000));
str += " [" + (int) s.getWeight() + "]";
double x = toScreenX(v.getX()) + 10;
double y = toScreenY(v.getY());
double dy = y - lastLabelY;
if (dy == 0) {
y = lastLabelY + 20;
} else if (Math.abs(dy) < 20) {
y = lastLabelY + Math.signum(dy) * 20;
}
text(str, (float) x, (float) y);
lastLabelY = y;
}
public double getTargetDistance(Vertex vertex) {
int vertexIndex = vertex.getIndex();
if (vertexIndex < distance.length) {
if (distance[vertexIndex] > 0.0) {
return distance[vertexIndex];
} else {
double d =
distanceLibrary.fastDistance(
realTargetCoordinate.y, realTargetCoordinate.x, vertex.getY(), vertex.getX());
distance[vertexIndex] = d;
return d;
}
} else {
return distanceLibrary.fastDistance(
realTargetCoordinate.y, realTargetCoordinate.x, vertex.getY(), vertex.getX());
}
}
protected List<Edge> getOutgoingMatchableEdges(Vertex vertex) {
List<Edge> edges = new ArrayList<Edge>();
for (Edge e : vertex.getOutgoing()) {
if (!(e instanceof StreetEdge)) continue;
if (e.getGeometry() == null) continue;
edges.add(e);
}
return edges;
}
public PatternHop getHopOut(Vertex v) {
for (TransitBoardAlight e : filter(v.getOutgoing(), TransitBoardAlight.class)) {
if (!e.isBoarding()) continue;
for (PatternHop f : filter(e.getToVertex().getOutgoing(), PatternHop.class)) {
return f;
}
}
return null;
}
/**
* Makes a new Place from a state. Contains information about time.
*
* @return
*/
private Place makePlace(State state, boolean time) {
Vertex v = state.getVertex();
Coordinate endCoord = v.getCoordinate();
String name = v.getName();
Place place;
if (time) {
Calendar timeAtState = makeCalendar(state);
place = new Place(endCoord.x, endCoord.y, name, timeAtState);
} else {
place = new Place(endCoord.x, endCoord.y, name);
}
if (v instanceof TransitVertex) {
TransitVertex transitVertex = (TransitVertex) v;
place.stopId = transitVertex.getStopId();
place.stopCode = transitVertex.getStopCode();
place.zoneId = state.getZone();
}
return place;
}
/*
* Iterate through all vertices and their (outgoing) edges. If they are of 'interesting' types, add them to the corresponding spatial index.
*/
public synchronized void buildSpatialIndex() {
vertexIndex = new STRtree();
edgeIndex = new STRtree();
Envelope env;
// int xminx, xmax, ymin, ymax;
for (Vertex v : graph.getVertices()) {
Coordinate c = v.getCoordinate();
env = new Envelope(c);
vertexIndex.insert(env, v);
for (Edge e : v.getOutgoing()) {
if (e.getGeometry() == null) continue;
if (e instanceof PatternEdge || e instanceof StreetTransitLink || e instanceof StreetEdge) {
env = e.getGeometry().getEnvelopeInternal();
edgeIndex.insert(env, e);
}
}
}
vertexIndex.build();
edgeIndex.build();
}
public void highlightVertex(Vertex v) {
Coordinate c = v.getCoordinate();
double xd = 0, yd = 0;
while (!modelBounds.contains(c)) {
xd = modelBounds.getWidth() / 100;
yd = modelBounds.getHeight() / 100;
modelBounds.expandBy(xd, yd);
}
modelBounds.expandBy(xd, yd);
highlightedVertex = v;
drawLevel = DRAW_ALL;
}
/**
* Internals of getRegionsForVertex; keeps track of seen vertices to avoid loops.
*
* @param regionData
* @param vertex
* @param seen
* @param depth
* @return
*/
private static HashSet<Integer> getRegionsForVertex(
RegionData regionData, Vertex vertex, HashSet<Vertex> seen, int depth) {
seen.add(vertex);
HashSet<Integer> regions = new HashSet<Integer>();
int region = vertex.getGroupIndex();
if (region >= 0) {
regions.add(region);
} else {
for (Edge e : vertex.getOutgoing()) {
final Vertex tov = e.getToVertex();
if (!seen.contains(tov))
regions.addAll(getRegionsForVertex(regionData, tov, seen, depth + 1));
}
for (Edge e : vertex.getIncoming()) {
final Vertex fromv = e.getFromVertex();
if (!seen.contains(fromv))
regions.addAll(getRegionsForVertex(regionData, fromv, seen, depth + 1));
}
}
return regions;
}