package mapred;
import java.io.*;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.*;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

public class USA_ZCoord {

	public static class USA_ZCoordMapper extends
			Mapper<Text, Text, Text, Text> {
		
		private final static Text txt1 = new Text();
		private final static Text txt2 = new Text();
		
		public void map(Text key, Text value, Context context)
				throws IOException, InterruptedException {
			txt1.set(key.toString()+" 0");
			txt2.set(value.toString());
			context.write(txt1, txt2);
		}
	}
	
	public static class USA_ZCoordReducer extends
	Reducer<Text, Text, NullWritable, Text> {

		private final static Text txt2 = new Text();

		public void reduce(Text key, Iterable<Text> values,
				Context context) throws IOException, InterruptedException {
			for(Text val:values)
			{//only 1 value
				txt2.set(key.toString()+"\t"+val.toString());
				context.write(NullWritable.get(), txt2);
			}
		}

	}

	public static void main(String[] args) throws Exception {
		Configuration conf = new Configuration();
		Job job = new Job(conf, "USA_ZCoord");
		String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
	    if (otherArgs.length != 2) {
	      System.err.println("Args: <in> <out>");
	      System.exit(2);
	    }
	    job.setJarByClass(USA_ZCoord.class);
	    
		job.setMapperClass(USA_ZCoordMapper.class);
		job.setMapOutputKeyClass(Text.class);
	    job.setMapOutputValueClass(Text.class);
	    
	    job.setReducerClass(USA_ZCoordReducer.class);
		job.setOutputKeyClass(NullWritable.class);
		job.setOutputValueClass(Text.class);
		job.setNumReduceTasks(120);
	    
		job.setInputFormatClass(KeyValueTextInputFormat.class);
		FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
		FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
		System.exit(job.waitForCompletion(true)?0:1);
	}
}