Enable mode-specific transfers by storing mode information in transfers

application/src/ext/java/org/opentripplanner/ext/flex/FlexIndex.java

@@ -5,9 +5,11 @@
 import com.google.common.collect.Multimap;
 import java.util.Collection;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import org.opentripplanner.ext.flex.trip.FlexTrip;
 import org.opentripplanner.model.PathTransfer;
+import org.opentripplanner.routing.api.request.StreetMode;
 import org.opentripplanner.transit.model.framework.FeedScopedId;
 import org.opentripplanner.transit.model.network.Route;
 import org.opentripplanner.transit.model.site.GroupStop;
@@ -18,15 +20,21 @@ public class FlexIndex {
 
   private final Multimap<StopLocation, PathTransfer> transfersToStop = ArrayListMultimap.create();
 
+  private final Multimap<StopLocation, PathTransfer> transfersFromStop = ArrayListMultimap.create();
+
   private final Multimap<StopLocation, FlexTrip<?, ?>> flexTripsByStop = HashMultimap.create();
 
   private final Map<FeedScopedId, Route> routeById = new HashMap<>();
 
   private final Map<FeedScopedId, FlexTrip<?, ?>> tripById = new HashMap<>();
 
   public FlexIndex(TimetableRepository timetableRepository) {
-    for (PathTransfer transfer : timetableRepository.getAllPathTransfers()) {
+    // Flex transfers should only use WALK mode transfers.
+    StreetMode mode = StreetMode.WALK;
+    List<PathTransfer> filteredPathTransfers = timetableRepository.getAllPathTransfers().stream().filter(pathTransfer -> pathTransfer.getModes().contains(mode)).toList();
+    for (PathTransfer transfer : filteredPathTransfers) {
       transfersToStop.put(transfer.to, transfer);
+      transfersFromStop.put(transfer.from, transfer);
     }
     for (FlexTrip<?, ?> flexTrip : timetableRepository.getAllFlexTrips()) {
       routeById.put(flexTrip.getTrip().getRoute().getId(), flexTrip.getTrip().getRoute());
@@ -47,6 +55,10 @@ public Collection<PathTransfer> getTransfersToStop(StopLocation stopLocation) {
     return transfersToStop.get(stopLocation);
   }
 
+  public Collection<PathTransfer> getTransfersFromStop(StopLocation stopLocation) {
+    return transfersFromStop.get(stopLocation);
+  }
+
   public Collection<FlexTrip<?, ?>> getFlexTripsByStop(StopLocation stopLocation) {
     return flexTripsByStop.get(stopLocation);
   }

application/src/ext/java/org/opentripplanner/ext/flex/FlexRouter.java

@@ -192,7 +192,7 @@ public TransitStopVertex getStopVertexForStopId(FeedScopedId stopId) {
 
     @Override
     public Collection<PathTransfer> getTransfersFromStop(StopLocation stop) {
-      return transitService.findPathTransfers(stop);
+      return transitService.getFlexIndex().getTransfersFromStop(stop);
     }
 
     @Override

application/src/main/java/org/opentripplanner/api/parameter/QualifiedModeSet.java

@@ -126,9 +126,10 @@ public RequestModes getRequestModes() {
             mBuilder.withEgressMode(StreetMode.CAR_HAILING);
             mBuilder.withDirectMode(StreetMode.WALK);
           } else {
-            mBuilder.withAccessMode(StreetMode.WALK);
-            mBuilder.withTransferMode(StreetMode.WALK);
-            mBuilder.withEgressMode(StreetMode.WALK);
+            // This is necessary for transfer calculations.
+            mBuilder.withAccessMode(StreetMode.CAR);
+            mBuilder.withTransferMode(StreetMode.CAR);
+            mBuilder.withEgressMode(StreetMode.CAR);
             mBuilder.withDirectMode(StreetMode.CAR);
           }
         }

application/src/main/java/org/opentripplanner/graph_builder/module/DirectTransferGenerator.java

@@ -3,10 +3,13 @@
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Multimaps;
 import java.time.Duration;
+import java.util.ArrayList;
+import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Collectors;
 import org.opentripplanner.framework.application.OTPFeature;
 import org.opentripplanner.graph_builder.issue.api.DataImportIssueStore;
 import org.opentripplanner.graph_builder.issues.StopNotLinkedForTransfers;
@@ -17,6 +20,7 @@
 import org.opentripplanner.graph_builder.module.nearbystops.StreetNearbyStopFinder;
 import org.opentripplanner.model.PathTransfer;
 import org.opentripplanner.routing.api.request.RouteRequest;
+import org.opentripplanner.routing.api.request.StreetMode;
 import org.opentripplanner.routing.graph.Graph;
 import org.opentripplanner.routing.graphfinder.NearbyStop;
 import org.opentripplanner.street.model.edge.Edge;
@@ -86,6 +90,17 @@ public void buildGraph() {
       HashMultimap.create()
     );
 
+    List<RouteRequest> flexTransferRequests = new ArrayList<>();
+    // Flex transfer requests only use the WALK mode.
+    if (OTPFeature.FlexRouting.isOn()) {
+      flexTransferRequests.addAll(
+        transferRequests
+          .stream()
+          .filter(transferProfile -> transferProfile.journey().transfer().mode() == StreetMode.WALK)
+          .toList()
+      );
+    }
+
     stops
       .stream()
       .parallel()
@@ -101,7 +116,9 @@ public void buildGraph() {
 
         LOG.debug("Linking stop '{}' {}", stop, ts0);
 
+        // Calculate default transfers.
         for (RouteRequest transferProfile : transferRequests) {
+          StreetMode mode = transferProfile.journey().transfer().mode();
           for (NearbyStop sd : nearbyStopFinder.findNearbyStops(
             ts0,
             transferProfile,
@@ -115,31 +132,51 @@ public void buildGraph() {
             if (sd.stop.transfersNotAllowed()) {
               continue;
             }
-            distinctTransfers.put(
-              new TransferKey(stop, sd.stop, sd.edges),
-              new PathTransfer(stop, sd.stop, sd.distance, sd.edges)
-            );
+            TransferKey transferKey = new TransferKey(stop, sd.stop, sd.edges);
+            PathTransfer pathTransfer = distinctTransfers.get(transferKey);
+            if (pathTransfer == null) {
+              // If the PathTransfer can't be found, it is created.
+              distinctTransfers.put(
+                transferKey,
+                new PathTransfer(stop, sd.stop, sd.distance, sd.edges, EnumSet.of(mode))
+              );
+            } else {
+              // If the PathTransfer is found, a new PathTransfer with the added mode is created.
+              distinctTransfers.put(transferKey, pathTransfer.withAddedMode(mode));
+            }
           }
-          if (OTPFeature.FlexRouting.isOn()) {
-            // This code is for finding transfers from AreaStops to Stops, transfers
-            // from Stops to AreaStops and between Stops are already covered above.
-            for (NearbyStop sd : nearbyStopFinder.findNearbyStops(
-              ts0,
-              transferProfile,
-              transferProfile.journey().transfer(),
-              true
-            )) {
-              // Skip the origin stop, loop transfers are not needed.
-              if (sd.stop == stop) {
-                continue;
-              }
-              if (sd.stop instanceof RegularStop) {
-                continue;
-              }
+        }
+        // Calculate flex transfers if flex routing is enabled.
+        for (RouteRequest transferProfile : flexTransferRequests) {
+          // Flex transfer requests only use the WALK mode.
+          StreetMode mode = StreetMode.WALK;
+          // This code is for finding transfers from AreaStops to Stops, transfers
+          // from Stops to AreaStops and between Stops are already covered above.
+          for (NearbyStop sd : nearbyStopFinder.findNearbyStops(
+            ts0,
+            transferProfile,
+            transferProfile.journey().transfer(),
+            true
+          )) {
+            // Skip the origin stop, loop transfers are not needed.
+            if (sd.stop == stop) {
+              continue;
+            }
+            if (sd.stop instanceof RegularStop) {
+              continue;
+            }
+            // The TransferKey and PathTransfer are created differently for flex routing.
+            TransferKey transferKey = new TransferKey(sd.stop, stop, sd.edges);
+            PathTransfer pathTransfer = distinctTransfers.get(transferKey);
+            if (pathTransfer == null) {
+              // If the PathTransfer can't be found, it is created.
               distinctTransfers.put(
-                new TransferKey(sd.stop, stop, sd.edges),
-                new PathTransfer(sd.stop, stop, sd.distance, sd.edges)
+                transferKey,
+                new PathTransfer(sd.stop, stop, sd.distance, sd.edges, EnumSet.of(mode))
               );
+            } else {
+              // If the PathTransfer is found, a new PathTransfer with the added mode is created.
+              distinctTransfers.put(transferKey, pathTransfer.withAddedMode(mode));
             }
           }
         }
@@ -172,6 +209,21 @@ public void buildGraph() {
       nTransfersTotal,
       nLinkedStops
     );
+    for (StreetMode mode : transferRequests
+      .stream()
+      .map(transferProfile -> transferProfile.journey().transfer().mode())
+      .distinct()
+      .toList()) {
+      LOG.info(
+        "Created {} transfers for mode {}.",
+        transfersByStop
+          .values()
+          .stream()
+          .filter(pathTransfer -> pathTransfer.getModes().contains(mode))
+          .count(),
+        mode
+      );
+    }
   }
 
   /**

application/src/main/java/org/opentripplanner/model/PathTransfer.java

@@ -1,19 +1,20 @@
 package org.opentripplanner.model;
 
 import java.io.Serializable;
+import java.util.EnumSet;
 import java.util.List;
 import org.opentripplanner.model.transfer.ConstrainedTransfer;
+import org.opentripplanner.routing.api.request.StreetMode;
 import org.opentripplanner.street.model.edge.Edge;
 import org.opentripplanner.transit.model.site.StopLocation;
 import org.opentripplanner.utils.tostring.ToStringBuilder;
 
 /**
- * Represents a transfer between stops with the street network path attatched to it.
+ * Represents a transfer for a set of modes between stops with the street network path attached to it.
  * <p>
  * Do not confuse this with {@link ConstrainedTransfer}.
  *
  * <p>
- * TODO these should really have a set of valid modes in case bike vs. walk transfers are different
  * TODO Should we just store the NearbyStop as a field here, or even switch to using it instead
  *      where this class is used
  */
@@ -27,11 +28,20 @@ public class PathTransfer implements Serializable {
 
   private final List<Edge> edges;
 
-  public PathTransfer(StopLocation from, StopLocation to, double distanceMeters, List<Edge> edges) {
+  private final EnumSet<StreetMode> modes;
+
+  public PathTransfer(
+    StopLocation from,
+    StopLocation to,
+    double distanceMeters,
+    List<Edge> edges,
+    EnumSet<StreetMode> modes
+  ) {
     this.from = from;
     this.to = to;
     this.distanceMeters = distanceMeters;
     this.edges = edges;
+    this.modes = modes;
   }
 
   public String getName() {
@@ -43,7 +53,17 @@ public double getDistanceMeters() {
   }
 
   public List<Edge> getEdges() {
-    return this.edges;
+    return edges;
+  }
+
+  public EnumSet<StreetMode> getModes() {
+    return modes.clone();
+  }
+
+  public PathTransfer withAddedMode(StreetMode mode) {
+    EnumSet<StreetMode> newModes = EnumSet.copyOf(modes);
+    newModes.add(mode);
+    return new PathTransfer(from, to, distanceMeters, edges, newModes);
   }
 
   @Override
@@ -54,6 +74,7 @@ public String toString() {
       .addObj("to", to)
       .addNum("distance", distanceMeters)
       .addColSize("edges", edges)
+      .addColSize("modes", modes)
       .toString();
   }
 }

application/src/main/java/org/opentripplanner/routing/algorithm/mapping/RaptorPathToItineraryMapper.java

@@ -126,7 +126,7 @@ else if (pathLeg.isTransferLeg()) {
           legs.addAll(
             mapTransferLeg(
               pathLeg.asTransferLeg(),
-              transferMode == StreetMode.BIKE ? TraverseMode.BICYCLE : TraverseMode.WALK
+              StreetModeToTransferTraverseModeMapper.map(transferMode)
             )
           );
         }

application/src/main/java/org/opentripplanner/routing/algorithm/mapping/StreetModeToTransferTraverseModeMapper.java

@@ -0,0 +1,21 @@
+package org.opentripplanner.routing.algorithm.mapping;
+
+import org.opentripplanner.routing.api.request.StreetMode;
+import org.opentripplanner.street.search.TraverseMode;
+
+/**
+ * Maps street mode to transfer traverse mode.
+ */
+public class StreetModeToTransferTraverseModeMapper {
+
+  public static TraverseMode map(StreetMode mode) {
+    return switch (mode) {
+      case WALK -> TraverseMode.WALK;
+      case BIKE -> TraverseMode.BICYCLE;
+      case CAR -> TraverseMode.CAR;
+      default -> throw new IllegalArgumentException(
+        String.format("StreetMode %s can not be mapped to a TraverseMode for transfers.", mode)
+      );
+    };
+  }
+}

application/src/main/java/org/opentripplanner/routing/algorithm/raptoradapter/transit/RaptorTransferIndex.java

@@ -6,6 +6,7 @@
 import java.util.List;
 import java.util.function.Function;
 import org.opentripplanner.raptor.api.model.RaptorTransfer;
+import org.opentripplanner.routing.api.request.StreetMode;
 import org.opentripplanner.street.search.request.StreetSearchRequest;
 
 public class RaptorTransferIndex {
@@ -29,6 +30,7 @@ public static RaptorTransferIndex create(
   ) {
     var forwardTransfers = new ArrayList<List<RaptorTransfer>>(transfersByStopIndex.size());
     var reversedTransfers = new ArrayList<List<RaptorTransfer>>(transfersByStopIndex.size());
+    StreetMode mode = request.mode();
 
     for (int i = 0; i < transfersByStopIndex.size(); i++) {
       forwardTransfers.add(new ArrayList<>());
@@ -41,6 +43,7 @@ public static RaptorTransferIndex create(
       var transfers = transfersByStopIndex
         .get(fromStop)
         .stream()
+        .filter(transfer -> transfer.getModes().contains(mode))
         .flatMap(s -> s.asRaptorTransfer(request).stream())
         .collect(
           toMap(RaptorTransfer::stop, Function.identity(), (a, b) -> a.c1() < b.c1() ? a : b)

application/src/main/java/org/opentripplanner/routing/algorithm/raptoradapter/transit/Transfer.java

@@ -2,12 +2,14 @@
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.EnumSet;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
 import org.locationtech.jts.geom.Coordinate;
 import org.opentripplanner.raptor.api.model.RaptorCostConverter;
 import org.opentripplanner.raptor.api.model.RaptorTransfer;
+import org.opentripplanner.routing.api.request.StreetMode;
 import org.opentripplanner.routing.api.request.preference.WalkPreferences;
 import org.opentripplanner.street.model.edge.Edge;
 import org.opentripplanner.street.search.request.StreetSearchRequest;
@@ -31,16 +33,20 @@ public class Transfer {
 
   private final List<Edge> edges;
 
-  public Transfer(int toStop, List<Edge> edges) {
+  private final EnumSet<StreetMode> modes;
+
+  public Transfer(int toStop, List<Edge> edges, EnumSet<StreetMode> modes) {
     this.toStop = toStop;
     this.edges = edges;
     this.distanceMeters = (int) edges.stream().mapToDouble(Edge::getDistanceMeters).sum();
+    this.modes = modes;
   }
 
-  public Transfer(int toStopIndex, int distanceMeters) {
+  public Transfer(int toStopIndex, int distanceMeters, EnumSet<StreetMode> modes) {
     this.toStop = toStopIndex;
     this.distanceMeters = distanceMeters;
     this.edges = null;
+    this.modes = modes;
   }
 
   public List<Coordinate> getCoordinates() {
@@ -68,6 +74,10 @@ public List<Edge> getEdges() {
     return edges;
   }
 
+  public EnumSet<StreetMode> getModes() {
+    return modes.clone();
+  }
+
   public Optional<RaptorTransfer> asRaptorTransfer(StreetSearchRequest request) {
     WalkPreferences walkPreferences = request.preferences().walk();
     if (edges == null || edges.isEmpty()) {