java source code of EmailExtractor

package stormapplied.githubcommits.topology;

import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;

public class EmailExtractor extends BaseBasicBolt {
  @Override
  public void declareOutputFields(OutputFieldsDeclarer declarer) {
    declarer.declare(new Fields("email"));
  }

  @Override
  public void execute(Tuple tuple,
                      BasicOutputCollector outputCollector) {
    String commit = tuple.getStringByField("commit");
    String[] parts = commit.split(" ");
    outputCollector.emit(new Values(parts[1]));
  }
}