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The OpenTripPlanner multimodal journey planning system
There is a newer version: 2.5.0
package org.opentripplanner.graph_builder.module.map;

import java.util.ArrayList;
import java.util.List;

import org.opentripplanner.common.geometry.SphericalDistanceLibrary;
import org.opentripplanner.routing.core.State;
import org.opentripplanner.routing.core.TraverseMode;
import org.opentripplanner.routing.api.request.RoutingRequest;
import org.opentripplanner.routing.edgetype.StreetEdge;
import org.opentripplanner.routing.graph.Edge;
import org.opentripplanner.routing.graph.Vertex;

import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.linearref.LinearLocation;

public abstract class MatchState {
    private static final RoutingRequest traverseOptions = new RoutingRequest(TraverseMode.CAR);

    protected static final double NEW_SEGMENT_PENALTY = 0.1;

    protected static final double NO_TRAVERSE_PENALTY = 20;

    public double currentError;

    public double accumulatedError;

    public MatchState parent;

    protected Edge edge;

    private double distanceAlongRoute = 0;

    public MatchState(MatchState parent, Edge edge, double distanceAlongRoute) {
        this.distanceAlongRoute = distanceAlongRoute;
        this.parent = parent;
        this.edge = edge;
        if (parent != null) {
            this.accumulatedError = parent.accumulatedError + parent.currentError;
            this.distanceAlongRoute += parent.distanceAlongRoute;
        }
    }

    public abstract List getNextStates();

    public Edge getEdge() {
        return edge;
    }

    public double getTotalError() {
        return accumulatedError + currentError;
    }

    protected boolean carsCanTraverse(Edge edge) {
        // should be done with a method on edge (canTraverse already exists on turnEdge) 
        State s0 = new State(edge.getFromVertex(), traverseOptions);
        State s1 = edge.traverse(s0);
        return s1 != null;
    }

    protected List getOutgoingMatchableEdges(Vertex vertex) {
        List edges = new ArrayList();
        for (Edge e : vertex.getOutgoing()) {
            if (!(e instanceof StreetEdge)) {
                continue;
            }
            if (e.getGeometry() == null) {
                continue;
            }
            edges.add(e);
        }
        return edges;
    }


    public double getDistanceAlongRoute() {
        return distanceAlongRoute;
    }

    /* computes the distance, in meters, along a geometry */
    protected static double distanceAlongGeometry(Geometry geometry, LinearLocation startIndex,
            LinearLocation endIndex) {

        if (endIndex == null) {
            endIndex = LinearLocation.getEndLocation(geometry);
        }
        double total = 0;
        LinearIterator it = new LinearIterator(geometry, startIndex);
        LinearLocation index = startIndex;
        Coordinate previousCoordinate = startIndex.getCoordinate(geometry);

        it.next();
        index = it.getLocation();
        while (index.compareTo(endIndex) < 0) {
            Coordinate thisCoordinate = index.getCoordinate(geometry);
            double distance = SphericalDistanceLibrary.fastDistance(previousCoordinate, thisCoordinate);
            total += distance;
            previousCoordinate = thisCoordinate;
            if (!it.hasNext()) {
                break;
            }
            it.next();
            index = it.getLocation();
        }
        //now, last bit of last segment
        Coordinate finalCoordinate = endIndex.getCoordinate(geometry);
        total += SphericalDistanceLibrary.distance(previousCoordinate, finalCoordinate);

        return total;
    }

    
    protected static double distance(Coordinate from, Coordinate to) {
        return SphericalDistanceLibrary.fastDistance(from, to);
    }

}