druid.examples.flights.FlightsConverter.java Source code

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Here is the source code for druid.examples.flights.FlightsConverter.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package druid.examples.flights;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.io.Closeables;
import com.metamx.common.parsers.CSVParser;
import com.metamx.druid.jackson.DefaultObjectMapper;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.Period;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Map;

/**
 */
public class FlightsConverter {

    private static final String[] METRIC_DIMENSIONS = new String[] { "Distance", "TaxiIn", "TaxiOut",
            "CarrierDelay", "WeatherDelay", "NASDelay", "SecurityDelay", "LateAircraftDelay", "ArrDelay",
            "DepDelay", "CRSElapsedTime", "ActualElapsedTime", "AirTime" };

    public static void main(String[] args) throws IOException {
        DateTimeZone.setDefault(DateTimeZone.UTC);
        ObjectMapper mapper = new DefaultObjectMapper();

        File flightsDataDirectory = new File(args[0]);
        File flightsOutputDirectory = new File(args[1]);
        flightsOutputDirectory.mkdirs();

        for (File flightsDataFile : flightsDataDirectory.listFiles()) {
            System.out.printf("Processing file[%s]%n", flightsDataFile);

            CSVParser parser = new CSVParser();
            BufferedReader in = null;
            BufferedWriter out = null;

            try {
                in = new BufferedReader(new FileReader(flightsDataFile));
                out = new BufferedWriter(new FileWriter(
                        new File(flightsOutputDirectory, flightsDataFile.getName().replace("csv", "json"))));

                int count = 0;
                long time = System.currentTimeMillis();
                parser.setFieldNames(in.readLine());
                String line = null;
                while ((line = in.readLine()) != null) {
                    if (++count % 100000 == 0) {
                        System.out.printf("File[%s], processed %,d lines in %,d millis.%n",
                                flightsDataFile.getName(), count, System.currentTimeMillis() - time);
                        time = System.currentTimeMillis();
                    }
                    Map<String, Object> event = parser.parse(line);

                    int year = Integer.parseInt(event.get("Year").toString());
                    int month = Integer.parseInt(event.get("Month").toString());
                    int dayOfMonth = Integer.parseInt(event.get("DayofMonth").toString());
                    int departureTime = Integer.parseInt(event.get("CRSDepTime").toString());
                    int hourOfDay = departureTime / 100;
                    final int minuteOfHour = departureTime % 100;

                    DateTime timestamp = new DateTime(String.format("%4d-%02d-%02d", year, month, dayOfMonth))
                            .plus(new Period(hourOfDay, minuteOfHour, 0, 0));

                    event.put("timestamp", timestamp);

                    for (String metricDimension : METRIC_DIMENSIONS) {
                        String value = event.get(metricDimension).toString();

                        if (value.equals("NA")) {
                            event.put(metricDimension, 0);
                        } else {
                            event.put(metricDimension, Integer.parseInt(value));
                        }
                    }

                    out.write(mapper.writeValueAsString(event));
                    out.write("\n");
                }
            } finally {
                Closeables.closeQuietly(in);
                Closeables.closeQuietly(out);
            }
        }
    }
}