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/*
* Copyright (c) 2015, Conveyal
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.conveyal.gtfs;
import com.conveyal.gtfs.error.GTFSError;
import com.conveyal.gtfs.error.GeneralError;
import com.conveyal.gtfs.model.Calendar;
import com.conveyal.gtfs.model.*;
import com.google.common.collect.Iterables;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.CoordinateList;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.LineString;
import org.mapdb.BTreeMap;
import org.mapdb.DB;
import org.mapdb.DBMaker;
import org.mapdb.Fun;
import org.mapdb.Fun.Tuple2;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.*;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
/**
* All entities must be from a single feed namespace.
* Composed of several GTFSTables.
*/
public class GTFSFeed implements Cloneable, Closeable {
private static final Logger LOG = LoggerFactory.getLogger(GTFSFeed.class);
public static final double METERS_PER_DEGREE_LATITUDE = 111111.111;
private DB db;
public String feedId = null;
public final Map agency;
public final Map feedInfo;
// This is how you do a multimap in mapdb: https://github.com/jankotek/MapDB/blob/release-1.0/src/test/java/examples/MultiMap.java
public final NavigableSet> frequencies;
public final Map routes;
public final Map stops;
public final Map transfers;
public final BTreeMap trips;
/** CRC32 of the GTFS file this was loaded from */
public long checksum;
/* Map from 2-tuples of (shape_id, shape_pt_sequence) to shape points */
public final ConcurrentNavigableMap, ShapePoint> shape_points;
/* Map from 2-tuples of (trip_id, stop_sequence) to stoptimes. */
public final BTreeMap stop_times;
/* A fare is a fare_attribute and all fare_rules that reference that fare_attribute. */
public final Map fares;
/* A service is a calendar entry and all calendar_dates that modify that calendar entry. */
public final BTreeMap services;
/* A place to accumulate errors while the feed is loaded. Tolerate as many errors as possible and keep on loading. */
public final NavigableSet errors;
/* Create geometry factory to produce LineString geometries. */
private GeometryFactory gf = new GeometryFactory();
private boolean loaded = false;
/**
* The order in which we load the tables is important for two reasons.
* 1. We must load feed_info first so we know the feed ID before loading any other entities. This could be relaxed
* by having entities point to the feed object rather than its ID String.
* 2. Referenced entities must be loaded before any entities that reference them. This is because we check
* referential integrity while the files are being loaded. This is done on the fly during loading because it allows
* us to associate a line number with errors in objects that don't have any other clear identifier.
*
* Interestingly, all references are resolvable when tables are loaded in alphabetical order.
*/
public void loadFromZipfileOrDirectory(File zip, String fid) throws IOException {
if (this.loaded) throw new UnsupportedOperationException("Attempt to load GTFS into existing database");
new FeedInfo.Loader(this).loadTable(zip);
// maybe we should just point to the feed object itself instead of its ID, and null out its stoptimes map after loading
if (fid != null) {
feedId = fid;
LOG.info("Feed ID is undefined, pester maintainers to include a feed ID. Using file name {}.", feedId); // TODO log an error, ideally feeds should include a feedID
}
else if (feedId == null || feedId.isEmpty()) {
feedId = new File(zip.getName()).getName().replaceAll("\\.zip$", "");
LOG.info("Feed ID is undefined, pester maintainers to include a feed ID. Using file name {}.", feedId); // TODO log an error, ideally feeds should include a feedID
}
else {
LOG.info("Feed ID is '{}'.", feedId);
}
db.getAtomicString("feed_id").set(feedId);
new Agency.Loader(this).loadTable(zip);
if (agency.isEmpty()) {
errors.add(new GeneralError("agency", 0, "agency_id", "Need at least one agency."));
}
// calendars and calendar dates are joined into services. This means a lot of manipulating service objects as
// they are loaded; since mapdb keys/values are immutable, load them in memory then copy them to MapDB once
// we're done loading them
Map serviceTable = new HashMap<>();
new Calendar.Loader(this, serviceTable).loadTable(zip);
new CalendarDate.Loader(this, serviceTable).loadTable(zip);
this.services.putAll(serviceTable);
serviceTable = null; // free memory
// Same deal
Map fares = new HashMap<>();
new FareAttribute.Loader(this, fares).loadTable(zip);
new FareRule.Loader(this, fares).loadTable(zip);
this.fares.putAll(fares);
fares = null; // free memory
new Route.Loader(this).loadTable(zip);
new ShapePoint.Loader(this).loadTable(zip);
new Stop.Loader(this).loadTable(zip);
new Transfer.Loader(this).loadTable(zip);
new Trip.Loader(this).loadTable(zip);
new Frequency.Loader(this).loadTable(zip);
new StopTime.Loader(this).loadTable(zip);
loaded = true;
}
public void loadFromFileAndLogErrors(File zip) throws IOException {
loadFromZipfileOrDirectory(zip, null);
for (GTFSError error : errors) {
LOG.error(error.getMessageWithContext());
}
}
public boolean hasFeedInfo () {
return !this.feedInfo.isEmpty();
}
public FeedInfo getFeedInfo () {
return this.hasFeedInfo() ? this.feedInfo.values().iterator().next() : null;
}
/**
* For the given trip ID, fetch all the stop times in order of increasing stop_sequence.
* This is an efficient iteration over a tree map.
*/
public Iterable getOrderedStopTimesForTrip (String trip_id) {
Map tripStopTimes =
stop_times.subMap(
Fun.t2(trip_id, null),
Fun.t2(trip_id, Fun.HI)
);
return tripStopTimes.values();
}
/** Get the shape for the given shape ID */
public Shape getShape (String shape_id) {
Shape shape = new Shape(this, shape_id);
return shape.shape_dist_traveled.length > 0 ? shape : null;
}
/**
* For the given trip ID, fetch all the stop times in order, and interpolate stop-to-stop travel times.
*/
public Iterable getInterpolatedStopTimesForTrip (String trip_id) throws FirstAndLastStopsDoNotHaveTimes {
// clone stop times so as not to modify base GTFS structures
StopTime[] stopTimes = StreamSupport.stream(getOrderedStopTimesForTrip(trip_id).spliterator(), false)
.map(st -> st.clone())
.toArray(i -> new StopTime[i]);
// avoid having to make sure that the array has length below.
if (stopTimes.length == 0) return Collections.emptyList();
// first pass: set all partially filled stop times
for (StopTime st : stopTimes) {
if (st.arrival_time != Entity.INT_MISSING && st.departure_time == Entity.INT_MISSING) {
st.departure_time = st.arrival_time;
}
if (st.arrival_time == Entity.INT_MISSING && st.departure_time != Entity.INT_MISSING) {
st.arrival_time = st.departure_time;
}
}
// quick check: ensure that first and last stops have times.
// technically GTFS requires that both arrival_time and departure_time be filled at both the first and last stop,
// but we are slightly more lenient and only insist that one of them be filled at both the first and last stop.
// The meaning of the first stop's arrival time is unclear, and same for the last stop's departure time (except
// in the case of interlining).
// it's fine to just check departure time, as the above pass ensures that all stop times have either both
// arrival and departure times, or neither
if (stopTimes[0].departure_time == Entity.INT_MISSING || stopTimes[stopTimes.length - 1].departure_time == Entity.INT_MISSING) {
throw new FirstAndLastStopsDoNotHaveTimes();
}
// second pass: fill complete stop times
int startOfInterpolatedBlock = -1;
for (int stopTime = 0; stopTime < stopTimes.length; stopTime++) {
if (stopTimes[stopTime].departure_time == Entity.INT_MISSING && startOfInterpolatedBlock == -1) {
startOfInterpolatedBlock = stopTime;
}
else if (stopTimes[stopTime].departure_time != Entity.INT_MISSING && startOfInterpolatedBlock != -1) {
// we have found the end of the interpolated section
int nInterpolatedStops = stopTime - startOfInterpolatedBlock;
double totalLengthOfInterpolatedSection = 0;
double[] lengthOfInterpolatedSections = new double[nInterpolatedStops];
for (int stopTimeToInterpolate = startOfInterpolatedBlock, i = 0; stopTimeToInterpolate < stopTime; stopTimeToInterpolate++, i++) {
Stop start = stops.get(stopTimes[stopTimeToInterpolate - 1].stop_id);
Stop end = stops.get(stopTimes[stopTimeToInterpolate].stop_id);
double segLen = fastDistance(start.stop_lat, start.stop_lon, end.stop_lat, end.stop_lon);
totalLengthOfInterpolatedSection += segLen;
lengthOfInterpolatedSections[i] = segLen;
}
// add the segment post-last-interpolated-stop
Stop start = stops.get(stopTimes[stopTime - 1].stop_id);
Stop end = stops.get(stopTimes[stopTime].stop_id);
totalLengthOfInterpolatedSection += fastDistance(start.stop_lat, start.stop_lon, end.stop_lat, end.stop_lon);
int departureBeforeInterpolation = stopTimes[startOfInterpolatedBlock - 1].departure_time;
int arrivalAfterInterpolation = stopTimes[stopTime].arrival_time;
int totalTime = arrivalAfterInterpolation - departureBeforeInterpolation;
double lengthSoFar = 0;
for (int stopTimeToInterpolate = startOfInterpolatedBlock, i = 0; stopTimeToInterpolate < stopTime; stopTimeToInterpolate++, i++) {
lengthSoFar += lengthOfInterpolatedSections[i];
int time = (int) (departureBeforeInterpolation + totalTime * (lengthSoFar / totalLengthOfInterpolatedSection));
stopTimes[stopTimeToInterpolate].arrival_time = stopTimes[stopTimeToInterpolate].departure_time = time;
}
// we're done with this block
startOfInterpolatedBlock = -1;
}
}
return Arrays.asList(stopTimes);
}
/**
* @return Equirectangular approximation to distance.
*/
public static double fastDistance (double lat0, double lon0, double lat1, double lon1) {
double midLat = (lat0 + lat1) / 2;
double xscale = Math.cos(Math.toRadians(midLat));
double dx = xscale * (lon1 - lon0);
double dy = (lat1 - lat0);
return Math.sqrt(dx * dx + dy * dy) * METERS_PER_DEGREE_LATITUDE;
}
public Collection getFrequencies (String trip_id) {
// IntelliJ tells me all these casts are unnecessary, and that's also my feeling, but the code won't compile
// without them
return (List) frequencies.subSet(new Fun.Tuple2(trip_id, null), new Fun.Tuple2(trip_id, Fun.HI)).stream()
.map(t2 -> ((Tuple2) t2).b)
.collect(Collectors.toList());
}
public LineString getStraightLineForStops(String trip_id) {
CoordinateList coordinates = new CoordinateList();
LineString ls = null;
Trip trip = trips.get(trip_id);
Iterable stopTimes;
stopTimes = getOrderedStopTimesForTrip(trip.trip_id);
if (Iterables.size(stopTimes) > 1) {
for (StopTime stopTime : stopTimes) {
Stop stop = stops.get(stopTime.stop_id);
Double lat = stop.stop_lat;
Double lon = stop.stop_lon;
coordinates.add(new Coordinate(lon, lat));
}
ls = gf.createLineString(coordinates.toCoordinateArray());
}
// set ls equal to null if there is only one stopTime to avoid an exception when creating linestring
else{
ls = null;
}
return ls;
}
/**
* Returns a trip geometry object (LineString) for a given trip id.
* If the trip has a shape reference, this will be used for the geometry.
* Otherwise, the ordered stoptimes will be used.
*
* @param trip_id trip id of desired trip geometry
* @return the LineString representing the trip geometry.
* @see LineString
*/
public LineString getTripGeometry(String trip_id){
CoordinateList coordinates = new CoordinateList();
LineString ls = null;
Trip trip = trips.get(trip_id);
// If trip has shape_id, use it to generate geometry.
if (trip.shape_id != null) {
Shape shape = getShape(trip.shape_id);
if (shape != null) ls = shape.geometry;
}
// Use the ordered stoptimes.
if (ls == null) {
ls = getStraightLineForStops(trip_id);
}
return ls;
}
/**
* Cloning can be useful when you want to make only a few modifications to an existing feed.
* Keep in mind that this is a shallow copy, so you'll have to create new maps in the clone for tables you want
* to modify.
*/
@Override
public GTFSFeed clone() {
try {
return (GTFSFeed) super.clone();
} catch (CloneNotSupportedException e) {
throw new RuntimeException(e);
}
}
public void close () {
db.close();
}
/** Thrown when we cannot interpolate stop times because the first or last stops do not have times */
public class FirstAndLastStopsDoNotHaveTimes extends RuntimeException {
/** do nothing */
}
/** Create a GTFS feed in a temp file */
public GTFSFeed () {
this(DBMaker.newTempFileDB()
.transactionDisable()
.mmapFileEnable()
.asyncWriteEnable()
.deleteFilesAfterClose()
.closeOnJvmShutdown()
.compressionEnable()
.make());
}
/** Create a GTFS feed connected to a particular DB, which will be created if it does not exist. */
public GTFSFeed(File file) {
this(constructDB(file));
}
private static DB constructDB(File file) {
DBMaker dbMaker = DBMaker.newFileDB(file)
.transactionDisable()
.mmapFileEnable()
.asyncWriteEnable()
.compressionEnable();
if (file.exists()) {
dbMaker.readOnly();
}
return dbMaker.make();
}
private GTFSFeed (DB db) {
this.db = db;
agency = db.getTreeMap("agency");
feedInfo = db.getTreeMap("feed_info");
routes = db.getTreeMap("routes");
trips = db.getTreeMap("trips");
stop_times = db.getTreeMap("stop_times");
frequencies = db.getTreeSet("frequencies");
transfers = db.getTreeMap("transfers");
stops = db.getTreeMap("stops");
fares = db.getTreeMap("fares");
services = db.getTreeMap("services");
shape_points = db.getTreeMap("shape_points");
feedId = db.getAtomicString("feed_id").get();
errors = db.getTreeSet("errors");
}
public LocalDate getStartDate() {
LocalDate startDate = getCalendarServiceRangeStart();
if (startDate == null) startDate = getCalendarDateStart();
return startDate;
}
public LocalDate getCalendarServiceRangeStart() {
int startDate = 0;
for (Service service : services.values()) {
if (service.calendar == null)
continue;
if (startDate == 0 || service.calendar.start_date < startDate) {
startDate = service.calendar.start_date;
}
}
if (startDate == 0)
return null;
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd", Locale.getDefault());
return LocalDate.parse(String.valueOf(startDate), formatter);
}
public LocalDate getCalendarDateStart() {
LocalDate startDate = null;
for (Service service : services.values()) {
for (LocalDate date : service.calendar_dates.keySet()) {
if (startDate == null
|| date.isBefore(startDate))
startDate = date;
}
}
return startDate;
}
public LocalDate getCalendarServiceRangeEnd() {
int endDate = 0;
for (Service service : services.values()) {
if (service.calendar == null)
continue;
if (endDate == 0 || service.calendar.end_date > endDate) {
endDate = service.calendar.end_date;
}
}
if (endDate == 0)
return null;
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd", Locale.getDefault());
return LocalDate.parse(String.valueOf(endDate), formatter);
}
public LocalDate getEndDate() {
LocalDate endDate = getCalendarServiceRangeEnd();
if (endDate == null) endDate = getCalendarDateEnd();
return endDate;
}
public LocalDate getCalendarDateEnd() {
LocalDate endDate = null;
for (Service service : services.values()) {
for (LocalDate date : service.calendar_dates.keySet()) {
if (endDate == null
|| date.isAfter(endDate))
endDate = date;
}
}
return endDate;
}
}
