Graphhopper: ClassCastException当计算路径与chastar /Dikstra Bi

Question

仅使用WGS84坐标，我可以将图形和索引写入磁盘。在另一个java项目中，我从磁盘读取图形和索引。下面的代码也可以很好地工作。

FlagEncoder encoder = new CarFlagEncoder();
EncodingManager em = new EncodingManager(encoder);
GraphBuilder gb = new GraphBuilder(em).
    setLocation(testDir).
    setStore(true).
    setCHGraph(new FastestWeighting(encoder));
// Load and use the graph
GraphHopperStorage graph = gb.load();
// Load index
LocationIndex index = new LocationIndexTree(graph.getBaseGraph(), graph.getDirectory());
if (!index.loadExisting())
    throw new IllegalStateException("location index cannot be loaded!");
AlgorithmOptions algoOpts = AlgorithmOptions.start().algorithm(Parameters.Algorithms.ASTAR_BI).
traversalMode(TraversalMode.NODE_BASED).
weighting(new FastestWeighting(encoder)).
build();
PrepareContractionHierarchies pch = new PrepareContractionHierarchies(graph.getDirectory(), graph, graph.getGraph(CHGraphImpl.class), new FastestWeighting(encoder), TraversalMode.NODE_BASED);
pch.doWork();
QueryResult fromQR = index.findClosest(fromCoordinate.x, fromCoordinate.y, EdgeFilter.ALL_EDGES);
QueryResult toQR = index.findClosest(toCoordinate.x, toCoordinate.y, EdgeFilter.ALL_EDGES);
QueryGraph queryGraph = new QueryGraph(graph);
queryGraph.lookup(fromQR, toQR);
RoutingAlgorithm algorithm = pch.createAlgo(queryGraph, algoOpts);
Path path = algorithm.calcPath(fromQR.getClosestNode(), toQR.getClosestNode());

然而，首先我想知道为什么准备缩略层次结构需要这么多时间。我原以为准备工作已经做好了。是不是又这样做了?名为"shortcuts_fastest_car"的文件的目的是什么?

第二，一旦调用algorithm.calcPath，我收到一个令人困惑的ClassCastException。

Exception in thread "main" java.lang.ClassCastException: com.graphhopper.storage.BaseGraph$EdgeIterable cannot be cast to com.graphhopper.util.CHEdgeIteratorState
at com.graphhopper.routing.util.LevelEdgeFilter.accept(LevelEdgeFilter.java:48)
at com.graphhopper.routing.AbstractRoutingAlgorithm.accept(AbstractRoutingAlgorithm.java:79)
at com.graphhopper.routing.AStarBidirection.fillEdges(AStarBidirection.java:217)
at com.graphhopper.routing.AStarBidirection.fillEdgesFrom(AStarBidirection.java:194)
at com.graphhopper.routing.AbstractBidirAlgo.runAlgo(AbstractBidirAlgo.java:68)
at com.graphhopper.routing.AbstractBidirAlgo.calcPath(AbstractBidirAlgo.java:61)

怎么了?是否有一些配置标志丢失?

Answer 1

我认为你必须通过CH图

graph.getGraph(CHGraphImpl.class)

而不仅仅是graph到QueryGraph构造函数