private List<Vertex> getAdjacentes(Vertex vert) {
List<Vertex> adj = new ArrayList<Vertex>();
for (Edge arco : arcos) {
if (arco.getSource().equals(vert) && !isVisited(arco.getDestination())) {
adj.add(arco.getDestination());
}
}
return adj;
}
private List<Vertex> getNeighbors(Vertex node) {
List<Vertex> neighbors = new ArrayList<Vertex>();
for (Edge edge : edges) {
if (edge.getSource().equals(node) && !isSettled(edge.getDestination())) {
neighbors.add(edge.getDestination());
}
}
return neighbors;
}
public boolean removeEdgeTo(Vertex destination) {
for (Edge edge : getOutgoingEdges()) {
if (edge.getDestination() == destination) {
getOutgoingEdges().remove(edge);
edge.getDestination().getIncomingEdges().remove(edge);
graph.edges().remove(edge);
return true;
}
}
return false;
}
private static <T> void getPathFind(Graph<T> graph, HashMap<T, nodeBody<T>> path, T n1, T n2) {
if (!(n1.equals(n2))) {
for (Edge<T> e : graph.getEdgesFrom(n1)) {
T neighbor = e.getDestination();
if (!(path.containsKey(neighbor))) {
path.put(neighbor, new nodeBody<T>());
}
int newCost = path.get(n1).getCost() + e.getWeight();
nodeBody<T> nBody = path.get(neighbor);
if (newCost < nBody.getCost()) {
nBody.setCost(newCost);
nBody.setFrom(n1);
}
}
T next = null;
int lowestCost = Integer.MAX_VALUE;
for (T n : path.keySet()) {
nodeBody<T> c = path.get(n);
if (!c.isDone()) {
if (c.getCost() < lowestCost) {
next = n;
lowestCost = c.getCost();
}
}
}
path.get(next).setDone(true);
getPathFind(graph, path, next, n2);
} else return;
}
public void compAdjEdges(Vertex s, int w) {
Vertex source = s;
int vertWeight = w;
int tempWeight;
int origWeight;
/* Each adjacent edge to the source Vertex,
* (if it has not yet been handled)
* has a weight which is added to the current pathWeight.
* If this pathWeight is smaller than the one associated with
* the given edge's vertex (destination.getWeight())
* then the vertex's weight is updated and this path is
* added to the priority queue
*/
for (Edge e : source.adjacentD) {
Edge curEdge = e;
Vertex curVer = e.getDestination();
origWeight = curVer.getWeight();
if (curVer.known == false) {
tempWeight = curEdge.getWeight();
tempWeight = tempWeight + vertWeight;
if (tempWeight < origWeight) {
curVer.setWeight(tempWeight);
curVer.previous = source;
pq.add(curVer);
}
}
}
}
private int getDistance(Vertex node, Vertex target) {
for (Edge edge : edges) {
if (edge.getSource().equals(node) && edge.getDestination().equals(target)) {
return edge.getWeight();
}
}
throw new RuntimeException("Should not happen");
}
private int getDistance(Vertex node, Vertex target) {
for (Edge edge : arcos) {
if (edge.getSource().equals(node) && edge.getDestination().equals(target)) {
return edge.getWeight();
}
}
throw new RuntimeException("Inalcancavel");
}
@Override
public T next() {
if (hasNext()) {
Edge<T> tmp = nextEdge;
nextEdge = null;
return source ? tmp.getSource().getData() : tmp.getDestination().getData();
}
throw new NoSuchElementException();
}
public void removeAllEdges() {
for (Edge edge : getIncomingEdges()) {
edge.getSource().getOutgoingEdges().remove(edge);
}
incoming = null;
for (Edge edge : getOutgoingEdges()) {
edge.getDestination().getIncomingEdges().remove(edge);
}
outgoing = null;
}
private void start(Graph<E> graph) {
E min;
while ((min = getMin()) != null) {
// label min as visited
unvisited.remove(min);
// for each min neighbor...
for (Edge<E> edge : graph.getOutboundEdges(min)) {
int alt = dist.get(min) + edge.getWeight();
if (alt < dist.get(edge.getDestination())) {
// a shorter path was found!
dist.put(edge.getDestination(), alt);
prev.get(edge.getDestination()).clear();
prev.get(edge.getDestination()).add(min);
} else if (alt == dist.get(edge.getDestination())) {
// another path was found!
prev.get(edge.getDestination()).add(min);
}
}
}
}
private static <T> List<Edge<T>> getPathReturn(
Graph<T> graph, HashMap<T, nodeBody<T>> path, T n1, T n2) {
if (!(n1.equals(n2))) {
T next = path.get(n1).getFrom();
Edge<T> RetE = null;
int lowestCost = Integer.MAX_VALUE;
for (Edge<T> e : graph.getEdgesBetween(n1, next)) {
if ((e.getWeight() < lowestCost) && (e.getDestination().equals(n1))) {
RetE = e;
lowestCost = e.getWeight();
}
}
for (Edge<T> e : graph.getEdgesBetween(next, n1)) {
if ((e.getWeight() < lowestCost) && (e.getDestination().equals(n1))) {
RetE = e;
lowestCost = e.getWeight();
}
}
List<Edge<T>> l = getPathReturn(graph, path, next, n2);
l.add(RetE);
return l;
} else return new ArrayList<Edge<T>>();
}
@Override
/** Computes the shortest path from the startId given to all other vertices */
public void computeShortestPath() throws IllegalStateException {
vertices = new ArrayList<Vertex>();
isComputed = true;
Vertex currentVertex = startGraph.getData(startId);
PriorityQueue<Vertex> vertexList = new PriorityQueue<Vertex>();
vertexList.add(currentVertex);
currentVertex.setDistance(0);
// Here we reset the vertex colors after every calculation
for (Vertex vertex : (ArrayList<Vertex>) ((CoffeeGraph) startGraph).getVertexList()) {
vertex.setColor(0);
}
// Basic implementation of Dijkstras algorithm.
while (!vertexList.isEmpty()) {
currentVertex = vertexList.poll();
if (currentVertex.getColor() == 0) {
currentVertex.setColor(1);
for (Edge edge : currentVertex.getEdgeSet()) {
Vertex tempVertex = edge.getDestination();
double tempDistance = weighing.weight(edge);
double totalDistance = currentVertex.getDistance() + tempDistance;
if (totalDistance < tempVertex.getDistance()) {
vertexList.remove(tempVertex);
tempVertex.setDistance(totalDistance);
tempVertex.setPrevious(currentVertex);
vertexList.add(tempVertex);
if (!vertices.contains(tempVertex)) {
vertices.add(tempVertex);
}
}
}
}
}
}
/** Construct the parallel composition of two PTAs. */
public PTA compose(PTA pta1, PTA pta2) {
Set<String> alpha1, alpha2, alpha1only, alpha2only, sync;
Transition transition;
Edge edge;
double prob;
IndexPair state;
int src, dest;
// Store PTAs locally and create new one to store parallel composition
this.pta1 = pta1;
this.pta2 = pta2;
par = new PTA();
// New set of clocks is union of sets for two PTAs
for (String s : pta1.clockNames) {
par.getOrAddClock(s);
}
for (String s : pta2.clockNames) {
par.getOrAddClock(s);
}
// Get alphabets, compute intersection etc.
alpha1 = pta1.getAlphabet();
alpha2 = pta2.getAlphabet();
// System.out.println("alpha1: " + alpha1);
// System.out.println("alpha2: " + alpha2);
sync = new LinkedHashSet<String>();
alpha1only = new LinkedHashSet<String>();
alpha2only = new LinkedHashSet<String>();
for (String a : alpha1) {
if (!("".equals(a)) && alpha2.contains(a)) {
sync.add(a);
} else {
alpha1only.add(a);
}
}
for (String a : alpha2) {
if (!alpha1.contains(a)) {
alpha2only.add(a);
}
}
// Explicitly add tau to action lists
alpha1only.add("");
alpha2only.add("");
// System.out.println("alpha1only: " + alpha1only);
// System.out.println("alpha2only: " + alpha2only);
// System.out.println("sync: " + sync);
// Initialise states storage
states = new IndexedSet<IndexPair>();
explore = new LinkedList<IndexPair>();
// Add initial location
addState(0, 0);
src = -1;
while (!explore.isEmpty()) {
// Pick next state to explore
// (they are stored in order found so know index is src+1)
state = explore.removeFirst();
src++;
// Go through asynchronous transitions of PTA 1
for (String a : alpha1only) {
for (Transition transition1 : pta1.getTransitionsByAction(state.i1, a)) {
// Create new transition
transition = par.addTransition(src, a);
// Copy guard
for (Constraint c : transition1.getGuardConstraints())
transition.addGuardConstraint(c.deepCopy().renameClocks(pta1, par));
// Combine edges
for (Edge edge1 : transition1.getEdges()) {
prob = edge1.getProbability();
dest = addState(edge1.getDestination(), state.i2);
edge = transition.addEdge(prob, dest);
// Copy resets
for (Map.Entry<Integer, Integer> e : edge1.getResets()) {
edge.addReset(PTA.renameClock(pta1, par, e.getKey()), e.getValue());
}
}
}
}
// Go through asynchronous transitions of PTA 2
for (String a : alpha2only) {
for (Transition transition2 : pta2.getTransitionsByAction(state.i2, a)) {
// Create new transition
transition = par.addTransition(src, a);
// Copy guard
for (Constraint c : transition2.getGuardConstraints())
transition.addGuardConstraint(c.deepCopy().renameClocks(pta2, par));
// Combine edges
for (Edge edge2 : transition2.getEdges()) {
prob = edge2.getProbability();
dest = addState(state.i1, edge2.getDestination());
edge = transition.addEdge(prob, dest);
// Copy resets
for (Map.Entry<Integer, Integer> e : edge2.getResets()) {
edge.addReset(PTA.renameClock(pta2, par, e.getKey()), e.getValue());
}
}
}
}
// Go through synchronous transitions
for (String a : sync) {
for (Transition transition1 : pta1.getTransitionsByAction(state.i1, a)) {
for (Transition transition2 : pta2.getTransitionsByAction(state.i2, a)) {
// Create new transition
transition = par.addTransition(src, a);
// Guard is conjunction of guards
for (Constraint c : transition1.getGuardConstraints())
transition.addGuardConstraint(c.deepCopy().renameClocks(pta1, par));
for (Constraint c : transition2.getGuardConstraints())
transition.addGuardConstraint(c.deepCopy().renameClocks(pta2, par));
// Combine edges
for (Edge edge1 : transition1.getEdges()) {
for (Edge edge2 : transition2.getEdges()) {
prob = edge1.getProbability() * edge2.getProbability();
dest = addState(edge1.getDestination(), edge2.getDestination());
edge = transition.addEdge(prob, dest);
// Reset set is union of reset sets
for (Map.Entry<Integer, Integer> e : edge1.getResets()) {
edge.addReset(PTA.renameClock(pta1, par, e.getKey()), e.getValue());
}
for (Map.Entry<Integer, Integer> e : edge2.getResets()) {
edge.addReset(PTA.renameClock(pta2, par, e.getKey()), e.getValue());
}
}
}
}
}
}
}
return par;
}
/** Build a time bounded reachability query into a PTA; return the new target location set. */
private BitSet buildTimeBoundIntoPta(
PTA pta, BitSet targetLocs, int timeBound, boolean timeBoundStrict) {
String timerClock = null;
int timerClockIndex, numLocs, newTargetLoc;
String newTargetLocString;
List<Transition> trNewList;
Transition trNew;
BitSet targetLocsNew;
boolean toTarget;
int i;
// Add a timer clock
timerClock = "time";
while (pta.getClockIndex(timerClock) != -1) timerClock += "_";
timerClockIndex = pta.addClock(timerClock);
// Add a new target location
numLocs = pta.getNumLocations();
newTargetLocString = "target";
while (pta.getLocationIndex(newTargetLocString) != -1) newTargetLocString += "_";
newTargetLoc = pta.addLocation(newTargetLocString);
// Go through old (on-target) locations
for (i = 0; i < numLocs; i++) {
trNewList = new ArrayList<Transition>();
for (Transition tr : pta.getTransitions(i)) {
// See if the transition can go to a target location
toTarget = false;
for (Edge e : tr.getEdges()) {
if (targetLocs.get(e.getDestination())) {
toTarget = true;
break;
}
}
// Copy transition, modify edges going to target and add guard
if (toTarget) {
trNew = new Transition(tr);
for (Edge e : trNew.getEdges()) {
if (targetLocs.get(e.getDestination())) {
e.setDestination(newTargetLoc);
}
}
if (timeBoundStrict)
trNew.addGuardConstraint(Constraint.buildLt(timerClockIndex, timeBound));
else trNew.addGuardConstraint(Constraint.buildLeq(timerClockIndex, timeBound));
trNewList.add(trNew);
// Modify guard of copied transition
if (timeBoundStrict)
tr.addGuardConstraint(Constraint.buildGeq(timerClockIndex, timeBound));
else tr.addGuardConstraint(Constraint.buildGt(timerClockIndex, timeBound));
}
}
// Add new transitions to PTA
for (Transition tr : trNewList) {
pta.addTransition(tr);
}
}
// Re-generate set of target locations
targetLocsNew = new BitSet(pta.getNumLocations());
targetLocsNew.set(newTargetLoc);
return targetLocsNew;
}
private static <T> void depthFirstSearch(Graph<T> graph, T n, Set<T> v) {
v.add(n);
for (Edge<T> e : graph.getEdgesFrom(n))
if (!v.contains(e.getDestination())) depthFirstSearch(graph, e.getDestination(), v);
}
