/**
* initial for routing, if the start node is an intersect, then it should already in the adjlist,
* than we just add it. If the start node is not intersect, then the node will not in adjlist, we
* need find the node's two edge entrance if the edge is bidirection or one edge entrance if the
* edge is oneway.
*
* @param startNode
* @param endNode
* @param startTime
* @param dayIndex
* @param nodeHelperCache
*/
public static PriorityQueue<NodeInfoHelper> initialStartSet(
long startNode,
long endNode,
int startTime,
int dayIndex,
HashMap<Long, NodeInfoHelper> nodeHelperCache) {
PriorityQueue<NodeInfoHelper> openSet =
new PriorityQueue<NodeInfoHelper>(
10000,
new Comparator<NodeInfoHelper>() {
public int compare(NodeInfoHelper n1, NodeInfoHelper n2) {
return (int) (n1.getTotalCost() - n2.getTotalCost());
}
});
NodeInfo start = OSMData.nodeHashMap.get(startNode);
NodeInfoHelper current;
// initial start end set
if (start.isIntersect()) {
// initial
current = new NodeInfoHelper(startNode);
current.setCost(0);
current.setCurrentLevel(10);
current.setHeuristic(OSMRouting.estimateHeuristic(startNode, endNode));
openSet.offer(current); // push the start node
nodeHelperCache.put(current.getNodeId(), current); // add cache
} else {
EdgeInfo edge = start.getOnEdgeList().getFirst();
double travelTime = 1; // second
int distance; // feet
int totalDistance = edge.getDistance(); // feet
if (!edge.isOneway()) {
// distance from start to middle
distance = edge.getStartDistance(startNode);
travelTime = edge.getTravelTime(startTime, dayIndex, false);
travelTime *= (double) distance / totalDistance;
travelTime /= OSMParam.MILLI_PER_SECOND;
current = new NodeInfoHelper(edge.getStartNode());
current.setCost(travelTime);
current.setCurrentLevel(10);
current.setHeuristic(OSMRouting.estimateHeuristic(edge.getStartNode(), endNode));
openSet.offer(current); // push the start node
nodeHelperCache.put(current.getNodeId(), current); // add cache
}
// distance from middle to end
distance = edge.getEndDistance(startNode);
travelTime = edge.getTravelTime(startTime, dayIndex, true);
travelTime *= (double) distance / totalDistance;
current = new NodeInfoHelper(edge.getEndNode());
current.setCost(travelTime);
current.setCurrentLevel(10);
current.setHeuristic(OSMRouting.estimateHeuristic(edge.getEndNode(), endNode));
openSet.offer(current); // push the start node
nodeHelperCache.put(current.getNodeId(), current); // add cache
}
return openSet;
}
/**
* initial the end node set, if the end node is intersect, add it directly or we find the end
* node's edge's entrance(s)
*
* @param nodeId
* @return
*/
public static HashSet<Long> initialEndSet(long nodeId) {
HashSet<Long> endSet = new HashSet<Long>();
NodeInfo end = OSMData.nodeHashMap.get(nodeId);
// initial start end set
if (end.isIntersect()) {
endSet.add(nodeId);
} else {
EdgeInfo edge = end.getOnEdgeList().getFirst();
if (!edge.isOneway()) {
endSet.add(edge.getEndNode());
}
endSet.add(edge.getStartNode());
}
return endSet;
}
/**
* using low bound for travel time, for reverse searching
*
* @param endNode
* @param startNode
* @param openSet
* @param nodeHelperCache
*/
public void initialEndSet(
long startNode,
long endNode,
PriorityQueue<NodeInfoHelper> openSet,
HashMap<Long, NodeInfoHelper> nodeHelperCache) {
NodeInfo start = OSMData.nodeHashMap.get(startNode);
NodeInfoHelper current;
// initial start end set
if (start.isIntersect()) {
// initial
current = new NodeInfoHelper(startNode);
current.setCost(0);
current.setCurrentLevel(10);
current.setHeuristic(OSMRouting.estimateHeuristic(startNode, endNode));
openSet.offer(current); // push the start node
nodeHelperCache.put(current.getNodeId(), current); // add cache
} else {
EdgeInfo edge = start.getOnEdgeList().getFirst();
double travelTime = 1; // second
int distance; // feet
int totalDistance = edge.getDistance(); // feet
if (!edge.isOneway()) {
// distance from start to middle
distance = edge.getStartDistance(startNode);
// get low bound of travel time
travelTime = edge.getTravelTimeMin(false);
travelTime *= (double) distance / totalDistance;
current = new NodeInfoHelper(edge.getStartNode());
current.setCost(travelTime);
current.setCurrentLevel(10);
current.setHeuristic(OSMRouting.estimateHeuristic(edge.getStartNode(), endNode));
openSet.offer(current); // push the start node
nodeHelperCache.put(current.getNodeId(), current); // add cache
}
// distance from middle to end
distance = edge.getEndDistance(startNode);
travelTime = edge.getTravelTimeMin(true);
travelTime *= (double) distance / totalDistance;
current = new NodeInfoHelper(edge.getEndNode());
current.setCost(travelTime);
current.setCurrentLevel(10);
current.setHeuristic(OSMRouting.estimateHeuristic(edge.getEndNode(), endNode));
openSet.offer(current); // push the start node
nodeHelperCache.put(current.getNodeId(), current); // add cache
}
}
public static FibonacciHeap<NodeInfoHelper> initialStartSet(
long startNode,
long endNode,
HashMap<Long, FibonacciHeapNode<NodeInfoHelper>> nodeHelperCache) {
FibonacciHeap<NodeInfoHelper> openSet = new FibonacciHeap<NodeInfoHelper>();
NodeInfo start = OSMData.nodeHashMap.get(startNode);
NodeInfoHelper initial;
FibonacciHeapNode<NodeInfoHelper> fInitial;
// initial start end set
if (start.isIntersect()) {
// initial
initial = new NodeInfoHelper(startNode);
initial.setCost(0);
initial.setHeuristic(estimateHeuristic(startNode, endNode));
fInitial = new FibonacciHeapNode<NodeInfoHelper>(initial);
openSet.insert(fInitial, initial.getTotalCost()); // push the start node
nodeHelperCache.put(initial.getNodeId(), fInitial); // add cache
} else {
EdgeInfo edge = start.getOnEdgeList().getFirst();
double speed = edge.getTravelSpeed();
int travelTime = 1; // second
int distance;
if (!edge.isOneway()) {
// distance from start to middle
distance = edge.getStartDistance(startNode);
travelTime = (int) Math.round(distance / speed * OSMParam.MILLI_PER_SECOND);
initial = new NodeInfoHelper(edge.getStartNode());
initial.setCost(travelTime);
initial.setHeuristic(estimateHeuristic(edge.getStartNode(), endNode));
fInitial = new FibonacciHeapNode<NodeInfoHelper>(initial);
openSet.insert(fInitial, initial.getTotalCost()); // push the start node
nodeHelperCache.put(initial.getNodeId(), fInitial); // add cache
}
distance = edge.getEndDistance(startNode);
travelTime = (int) Math.round(distance / speed * OSMParam.MILLI_PER_SECOND);
initial = new NodeInfoHelper(edge.getEndNode());
initial.setCost(travelTime);
initial.setHeuristic(estimateHeuristic(edge.getEndNode(), endNode));
fInitial = new FibonacciHeapNode<NodeInfoHelper>(initial);
openSet.insert(fInitial, initial.getTotalCost()); // push the start node
nodeHelperCache.put(initial.getNodeId(), fInitial); // add cache
}
return openSet;
}