MedianMaper.java Source code

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Here is the source code for MedianMaper.java

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/*
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/**
 *
 * @auth|| Ruinan
 */

import java.io.IOException;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.conf;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.io.FileNotFoundException;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Calendar;

public class MedianMaper extends Mapper<LongWritable, Text, IntWritable, IntWritable> {
    @Override
    public void map(LongWritable Key, Text Value, Context context) throws IOException, InterruptedException {
        int YearWeek;
        double Price;
        Configuration conf = context.getConfiguration();
        String Cheapest_Carrier = conf.get("Cheapest_Carrier");
        Calendar Cal = Calendar.getInstance();
        FlightPriceParser FParser = new FlightPriceParser();
        if (!FParser.map(Value.toString())) {
            return;
        }
        if (FParser.Carrier != Cheapest_Carrier)
            return;
        Cal.set(FParser.Year, FParser.Month - 1, FParser.DayOfMonth);
        YearWeek = FParser.Year * 100 + Cal.get(Calendar.WEEK_OF_YEAR);
        context.write(new IntWritable(YearWeek), new IntWritable((int) Math.round(FParser.Price * 100)));
    }
}