67 lines
2.1 KiB
Java
67 lines
2.1 KiB
Java
|
package ch.zhaw.ads;
|
||
|
|
|
||
|
|
import java.util.LinkedList;
|
||
|
|
import java.util.List;
|
||
|
|
import java.util.Queue;
|
||
|
|
import java.util.StringTokenizer;
|
||
|
|
|
||
|
|
public class RouteServer implements CommandExecutor {
|
||
|
|
/**
|
||
|
|
build the graph given a text file with the topology
|
||
|
|
*/
|
||
|
|
public Graph<DijkstraNode> createGraph(String topo) throws Exception {
|
||
|
|
// TODO implement
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
apply the dijkstra algorithm
|
||
|
|
*/
|
||
|
|
public void dijkstraRoute(Graph<DijkstraNode> graph, String from, String to) {
|
||
|
|
// TODO implement
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
find the route in the graph after applied dijkstra
|
||
|
|
the route should be returned with the start town first
|
||
|
|
*/
|
||
|
|
public List<DijkstraNode> getRoute(Graph<DijkstraNode, Edge> graph, String to) {
|
||
|
|
List<DijkstraNode> route = new LinkedList<>();
|
||
|
|
DijkstraNode town = graph.findNode(to);
|
||
|
|
do {
|
||
|
|
route.add(0, town);
|
||
|
|
town = town.getPrev();
|
||
|
|
} while (town != null);
|
||
|
|
return route;
|
||
|
|
}
|
||
|
|
|
||
|
|
public String execute(String topo) throws Exception {
|
||
|
|
Graph<DijkstraNode, Edge> graph = createGraph(topo);
|
||
|
|
dijkstraRoute(graph, "Winterthur", "Lugano");
|
||
|
|
List<DijkstraNode> route = getRoute(graph, "Lugano");
|
||
|
|
// generate result string
|
||
|
|
StringBuilder builder = new StringBuilder();
|
||
|
|
for (DijkstraNode rt : route) builder.append(rt).append("\n");
|
||
|
|
return builder.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
public static void main(String[] args)throws Exception {
|
||
|
|
String swiss = "Winterthur Zürich 25\n" +
|
||
|
|
"Zürich Bern 126\n" +
|
||
|
|
"Zürich Genf 277\n" +
|
||
|
|
"Zürich Luzern 54\n" +
|
||
|
|
"Zürich Chur 121\n" +
|
||
|
|
"Zürich Berikon 16\n" +
|
||
|
|
"Bern Genf 155\n" +
|
||
|
|
"Genf Lugano 363\n" +
|
||
|
|
"Lugano Luzern 206\n" +
|
||
|
|
"Lugano Chur 152\n" +
|
||
|
|
"Chur Luzern 146\n" +
|
||
|
|
"Luzern Bern 97\n" +
|
||
|
|
"Bern Berikon 102\n" +
|
||
|
|
"Luzern Berikon 41\n";
|
||
|
|
RouteServer server = new RouteServer();
|
||
|
|
System.out.println(server.execute(swiss));
|
||
|
|
}
|
||
|
|
}
|