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GtfsRealtimeFileTripUpdateSource.java
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GtfsRealtimeFileTripUpdateSource.java
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/* This program is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
package org.opentripplanner.updater.stoptime;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import com.fasterxml.jackson.databind.JsonNode;
import org.opentripplanner.routing.graph.Graph;
import org.opentripplanner.updater.JsonConfigurable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.transit.realtime.GtfsRealtime;
import com.google.transit.realtime.GtfsRealtime.FeedEntity;
import com.google.transit.realtime.GtfsRealtime.FeedMessage;
import com.google.transit.realtime.GtfsRealtime.TripUpdate;
/** Reads the GTFS-RT from a local file. */
public class GtfsRealtimeFileTripUpdateSource implements TripUpdateSource, JsonConfigurable {
private static final Logger LOG =
LoggerFactory.getLogger(GtfsRealtimeFileTripUpdateSource.class);
private File file;
/**
* True iff the last list with updates represent all updates that are active right now, i.e. all
* previous updates should be disregarded
*/
private boolean fullDataset = true;
/**
* Default agency id that is used for the trip ids in the TripUpdates
*/
private String agencyId;
@Override
public void configure(Graph graph, JsonNode config) throws Exception {
this.agencyId = config.path("defaultAgencyId").asText();
this.file = new File(config.path("file").asText(""));
}
@Override
public List<TripUpdate> getUpdates() {
FeedMessage feedMessage = null;
List<FeedEntity> feedEntityList = null;
List<TripUpdate> updates = null;
fullDataset = true;
try {
InputStream is = new FileInputStream(file);
if (is != null) {
// Decode message
feedMessage = FeedMessage.PARSER.parseFrom(is);
feedEntityList = feedMessage.getEntityList();
// Change fullDataset value if this is an incremental update
if (feedMessage.hasHeader()
&& feedMessage.getHeader().hasIncrementality()
&& feedMessage.getHeader().getIncrementality()
.equals(GtfsRealtime.FeedHeader.Incrementality.DIFFERENTIAL)) {
fullDataset = false;
}
// Create List of TripUpdates
updates = new ArrayList<TripUpdate>(feedEntityList.size());
for (FeedEntity feedEntity : feedEntityList) {
if (feedEntity.hasTripUpdate()) updates.add(feedEntity.getTripUpdate());
}
}
} catch (Exception e) {
LOG.warn("Failed to parse gtfs-rt feed at " + file + ":", e);
}
return updates;
}
@Override
public boolean getFullDatasetValueOfLastUpdates() {
return fullDataset;
}
public String toString() {
return "GtfsRealtimeFileTripUpdateSource(" + file + ")";
}
@Override
public String getAgencyId() {
return this.agencyId;
}
}