Examples with AlternativeRoutingTemplate com.graphhopper.routing.template.AlternativeRoutingTemplate used on opensource projects

Example 1 with AlternativeRoutingTemplate

use of com.graphhopper.routing.template.AlternativeRoutingTemplate in project graphhopper by graphhopper.

the class GraphHopper method calcPaths.

/**
     * This method calculates the alternative path list using the low level Path objects.
     */
public List<Path> calcPaths(GHRequest request, GHResponse ghRsp) {
    if (ghStorage == null || !fullyLoaded)
        throw new IllegalStateException("Do a successful call to load or importOrLoad before routing");
    if (ghStorage.isClosed())
        throw new IllegalStateException("You need to create a new GraphHopper instance as it is already closed");
    // default handling
    String vehicle = request.getVehicle();
    if (vehicle.isEmpty()) {
        vehicle = getDefaultVehicle().toString();
        request.setVehicle(vehicle);
    }
    Lock readLock = readWriteLock.readLock();
    readLock.lock();
    try {
        if (!encodingManager.supports(vehicle))
            throw new IllegalArgumentException("Vehicle " + vehicle + " unsupported. " + "Supported are: " + getEncodingManager());
        HintsMap hints = request.getHints();
        String tModeStr = hints.get("traversal_mode", traversalMode.toString());
        TraversalMode tMode = TraversalMode.fromString(tModeStr);
        if (hints.has(Routing.EDGE_BASED))
            tMode = hints.getBool(Routing.EDGE_BASED, false) ? TraversalMode.EDGE_BASED_2DIR : TraversalMode.NODE_BASED;
        FlagEncoder encoder = encodingManager.getEncoder(vehicle);
        boolean forceFlexibleMode = hints.getBool(CH.DISABLE, false);
        if (!chFactoryDecorator.isDisablingAllowed() && forceFlexibleMode)
            throw new IllegalArgumentException("Flexible mode not enabled on the server-side");
        String algoStr = request.getAlgorithm();
        if (algoStr.isEmpty())
            algoStr = chFactoryDecorator.isEnabled() && !forceFlexibleMode && !(lmFactoryDecorator.isEnabled() && !hints.getBool(Landmark.DISABLE, false)) ? DIJKSTRA_BI : ASTAR_BI;
        List<GHPoint> points = request.getPoints();
        // TODO Maybe we should think about a isRequestValid method that checks all that stuff that we could do to fail fast
        // For example see #734
        checkIfPointsAreInBounds(points);
        RoutingTemplate routingTemplate;
        if (ROUND_TRIP.equalsIgnoreCase(algoStr))
            routingTemplate = new RoundTripRoutingTemplate(request, ghRsp, locationIndex, maxRoundTripRetries);
        else if (ALT_ROUTE.equalsIgnoreCase(algoStr))
            routingTemplate = new AlternativeRoutingTemplate(request, ghRsp, locationIndex);
        else
            routingTemplate = new ViaRoutingTemplate(request, ghRsp, locationIndex);
        List<Path> altPaths = null;
        int maxRetries = routingTemplate.getMaxRetries();
        Locale locale = request.getLocale();
        Translation tr = trMap.getWithFallBack(locale);
        for (int i = 0; i < maxRetries; i++) {
            StopWatch sw = new StopWatch().start();
            List<QueryResult> qResults = routingTemplate.lookup(points, encoder);
            ghRsp.addDebugInfo("idLookup:" + sw.stop().getSeconds() + "s");
            if (ghRsp.hasErrors())
                return Collections.emptyList();
            RoutingAlgorithmFactory tmpAlgoFactory = getAlgorithmFactory(hints);
            Weighting weighting;
            QueryGraph queryGraph;
            if (chFactoryDecorator.isEnabled() && !forceFlexibleMode) {
                boolean forceCHHeading = hints.getBool(CH.FORCE_HEADING, false);
                if (!forceCHHeading && request.hasFavoredHeading(0))
                    throw new IllegalArgumentException("Heading is not (fully) supported for CHGraph. See issue #483");
                // if LM is enabled we have the LMFactory with the CH algo!
                RoutingAlgorithmFactory chAlgoFactory = tmpAlgoFactory;
                if (tmpAlgoFactory instanceof LMAlgoFactoryDecorator.LMRAFactory)
                    chAlgoFactory = ((LMAlgoFactoryDecorator.LMRAFactory) tmpAlgoFactory).getDefaultAlgoFactory();
                if (chAlgoFactory instanceof PrepareContractionHierarchies)
                    weighting = ((PrepareContractionHierarchies) chAlgoFactory).getWeighting();
                else
                    throw new IllegalStateException("Although CH was enabled a non-CH algorithm factory was returned " + tmpAlgoFactory);
                tMode = getCHFactoryDecorator().getNodeBase();
                queryGraph = new QueryGraph(ghStorage.getGraph(CHGraph.class, weighting));
                queryGraph.lookup(qResults);
            } else {
                checkNonChMaxWaypointDistance(points);
                queryGraph = new QueryGraph(ghStorage);
                queryGraph.lookup(qResults);
                weighting = createWeighting(hints, encoder, queryGraph);
                ghRsp.addDebugInfo("tmode:" + tMode.toString());
            }
            int maxVisitedNodesForRequest = hints.getInt(Routing.MAX_VISITED_NODES, maxVisitedNodes);
            if (maxVisitedNodesForRequest > maxVisitedNodes)
                throw new IllegalArgumentException("The max_visited_nodes parameter has to be below or equal to:" + maxVisitedNodes);
            weighting = createTurnWeighting(queryGraph, weighting, tMode);
            AlgorithmOptions algoOpts = AlgorithmOptions.start().algorithm(algoStr).traversalMode(tMode).weighting(weighting).maxVisitedNodes(maxVisitedNodesForRequest).hints(hints).build();
            altPaths = routingTemplate.calcPaths(queryGraph, tmpAlgoFactory, algoOpts);
            boolean tmpEnableInstructions = hints.getBool(Routing.INSTRUCTIONS, enableInstructions);
            boolean tmpCalcPoints = hints.getBool(Routing.CALC_POINTS, calcPoints);
            double wayPointMaxDistance = hints.getDouble(Routing.WAY_POINT_MAX_DISTANCE, 1d);
            DouglasPeucker peucker = new DouglasPeucker().setMaxDistance(wayPointMaxDistance);
            PathMerger pathMerger = new PathMerger().setCalcPoints(tmpCalcPoints).setDouglasPeucker(peucker).setEnableInstructions(tmpEnableInstructions).setSimplifyResponse(simplifyResponse && wayPointMaxDistance > 0);
            if (routingTemplate.isReady(pathMerger, tr))
                break;
        }
        return altPaths;
    } catch (IllegalArgumentException ex) {
        ghRsp.addError(ex);
        return Collections.emptyList();
    } finally {
        readLock.unlock();
    }
}