com.graphhopper.gtfs.Transfers Maven / Gradle / Ivy
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* Licensed to GraphHopper GmbH under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*
* GraphHopper GmbH licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.graphhopper.gtfs;
import com.conveyal.gtfs.GTFSFeed;
import com.conveyal.gtfs.model.Stop;
import com.conveyal.gtfs.model.Transfer;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Transfers {
private final Map> transfersFromStop;
private final Map> transfersToStop;
private final Map> routesByStop;
public Transfers(GTFSFeed feed) {
this.transfersToStop = explodeTransfers(feed).collect(Collectors.groupingBy(t -> t.to_stop_id));
this.transfersFromStop = explodeTransfers(feed).collect(Collectors.groupingBy(t -> t.from_stop_id));
this.routesByStop = feed.stop_times.values().stream()
.collect(Collectors.groupingBy(stopTime -> stopTime.stop_id,
Collectors.mapping(stopTime -> feed.trips.get(stopTime.trip_id).route_id, Collectors.toSet())));
}
private Stream explodeTransfers(GTFSFeed feed) {
return feed.transfers.values().stream()
.flatMap(t -> {
Stop fromStop = feed.stops.get(t.from_stop_id);
if (fromStop.location_type == 1) {
return feed.stops.values().stream()
.filter(location -> location.location_type == 0)
.filter(stop -> fromStop.stop_id.equals(stop.parent_station))
.map(platform -> {
Transfer clone = t.clone();
clone.from_stop_id = platform.stop_id;
return clone;
});
} else {
return Stream.of(t);
}
})
.flatMap(t -> {
Stop toStop = feed.stops.get(t.to_stop_id);
if (toStop.location_type == 1) {
return feed.stops.values().stream()
.filter(location -> location.location_type == 0)
.filter(stop -> toStop.stop_id.equals(stop.parent_station))
.map(platform -> {
Transfer clone = t.clone();
clone.to_stop_id = platform.stop_id;
return clone;
});
} else {
return Stream.of(t);
}
});
}
// Starts implementing the proposed GTFS extension for route and trip specific transfer rules.
// So far, only the route is supported.
List getTransfersToStop(String toStopId, String toRouteId) {
final List allInboundTransfers = transfersToStop.getOrDefault(toStopId, Collections.emptyList());
final Map> byFromStop = allInboundTransfers.stream()
.filter(t -> t.transfer_type == 0 || t.transfer_type == 2)
.filter(t -> t.to_route_id == null || toRouteId.equals(t.to_route_id))
.collect(Collectors.groupingBy(t -> t.from_stop_id));
final List result = new ArrayList<>();
byFromStop.forEach((fromStop, transfers) -> {
if (hasNoRouteSpecificArrivalTransferRules(fromStop)) {
Transfer myRule = new Transfer();
myRule.from_stop_id = fromStop;
myRule.to_stop_id = toStopId;
if(transfers.size() == 1)
myRule.min_transfer_time = transfers.get(0).min_transfer_time;
result.add(myRule);
} else {
routesByStop.getOrDefault(fromStop, Collections.emptySet()).forEach(fromRoute -> {
final Transfer mostSpecificRule = findMostSpecificRule(transfers, fromRoute, toRouteId);
final Transfer myRule = new Transfer();
myRule.to_route_id = toRouteId;
myRule.from_route_id = fromRoute;
myRule.to_stop_id = mostSpecificRule.to_stop_id;
myRule.from_stop_id = mostSpecificRule.from_stop_id;
myRule.transfer_type = mostSpecificRule.transfer_type;
myRule.min_transfer_time = mostSpecificRule.min_transfer_time;
myRule.from_trip_id = mostSpecificRule.from_trip_id;
myRule.to_trip_id = mostSpecificRule.to_trip_id;
result.add(myRule);
});
}
});
if (result.stream().noneMatch(t -> t.from_stop_id.equals(toStopId))) {
final Transfer withinStationTransfer = new Transfer();
withinStationTransfer.from_stop_id = toStopId;
withinStationTransfer.to_stop_id = toStopId;
result.add(withinStationTransfer);
}
return result;
}
List getTransfersFromStop(String fromStopId, String fromRouteId) {
final List allOutboundTransfers = transfersFromStop.getOrDefault(fromStopId, Collections.emptyList());
final Map> byToStop = allOutboundTransfers.stream()
.filter(t -> t.transfer_type == 0 || t.transfer_type == 2)
.filter(t -> t.from_route_id == null || fromRouteId.equals(t.from_route_id))
.collect(Collectors.groupingBy(t -> t.to_stop_id));
final List result = new ArrayList<>();
byToStop.forEach((toStop, transfers) -> {
routesByStop.getOrDefault(toStop, Collections.emptySet()).forEach(toRouteId -> {
final Transfer mostSpecificRule = findMostSpecificRule(transfers, fromRouteId, toRouteId);
final Transfer myRule = new Transfer();
myRule.to_route_id = toRouteId;
myRule.from_route_id = fromRouteId;
myRule.to_stop_id = mostSpecificRule.to_stop_id;
myRule.from_stop_id = mostSpecificRule.from_stop_id;
myRule.transfer_type = mostSpecificRule.transfer_type;
myRule.min_transfer_time = mostSpecificRule.min_transfer_time;
myRule.from_trip_id = mostSpecificRule.from_trip_id;
myRule.to_trip_id = mostSpecificRule.to_trip_id;
result.add(myRule);
});
});
return result;
}
private Transfer findMostSpecificRule(List transfers, String fromRouteId, String toRouteId) {
final ArrayList transfersBySpecificity = new ArrayList<>(transfers);
transfersBySpecificity.sort(Comparator.comparingInt(t -> {
int score = 0;
if (Objects.equals(fromRouteId, t.from_route_id)) {
score++;
}
if (Objects.equals(toRouteId, t.to_route_id)) {
score++;
}
return -score;
}));
if (transfersBySpecificity.isEmpty()) {
throw new RuntimeException();
}
return transfersBySpecificity.get(0);
}
public boolean hasNoRouteSpecificDepartureTransferRules(String stop_id) {
return transfersToStop.getOrDefault(stop_id, Collections.emptyList()).stream().allMatch(transfer -> transfer.to_route_id == null);
}
public boolean hasNoRouteSpecificArrivalTransferRules(String stop_id) {
return transfersFromStop.getOrDefault(stop_id, Collections.emptyList()).stream().allMatch(transfer -> transfer.from_route_id == null);
}
}