import java.io.IOException;
import java.util.Iterator;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;

public class WordCountReducer extends MapReduceBase implements Reducer {

	public void reduce(WritableComparable key, Iterator values,
			OutputCollector output, Reporter reporter) throws IOException {
	    int cnt = 0;
	    while(values.hasNext()) {
		IntWritable ival = (IntWritable) values.next();
		cnt += ival.get();
	    }
	    output.collect(key, new IntWritable(cnt));
	}

}