org.opentripplanner.updater.stoptime.GtfsRealtimeHttpTripUpdateSource Maven / Gradle / Ivy

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The OpenTripPlanner multimodal journey planning system
There is a newer version: 2.6.0
package org.opentripplanner.updater.stoptime;

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;
import org.opentripplanner.util.HttpUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStream;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

public class GtfsRealtimeHttpTripUpdateSource implements TripUpdateSource {
    private static final Logger LOG =
            LoggerFactory.getLogger(GtfsRealtimeHttpTripUpdateSource.class);

    /**
     * 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;

    /**
     * Feed id that is used to match trip ids in the TripUpdates
     */
    private final String feedId;

    private final String url;

    public GtfsRealtimeHttpTripUpdateSource(Parameters config) {
        this.feedId = config.getFeedId();
        this.url = config.getUrl();
    }

    @Override
    public List getUpdates() {
        FeedMessage feedMessage = null;
        List feedEntityList = null;
        List updates = null;
        fullDataset = true;
        try {
            InputStream is = HttpUtils.getData(
                    URI.create(url),
                    "Accept",
                    "application/x-google-protobuf, application/x-protobuf, application/protobuf, application/octet-stream, */*");
            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<>(feedEntityList.size());
                for (FeedEntity feedEntity : feedEntityList) {
                    if (feedEntity.hasTripUpdate()) updates.add(feedEntity.getTripUpdate());
                }
            }
        } catch (Exception e) {
            LOG.warn("Failed to parse gtfs-rt feed from " + url + ":", e);
        }
        return updates;
    }

    @Override
    public boolean getFullDatasetValueOfLastUpdates() {
        return fullDataset;
    }
    
    public String toString() {
        return "GtfsRealtimeHttpUpdateStreamer(" + url + ")";
    }

    @Override
    public String getFeedId() {
        return this.feedId;
    }


    interface Parameters {
        String getFeedId();
        String getUrl();
    }
}