content: package backtype.storm.testing;
  
  import backtype.storm.topology.base.BaseBasicBolt;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.tuple.Tuple;
  import backtype.storm.tuple.Fields;
  import java.util.Map;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.BasicOutputCollector;
  import java.util.HashMap;
  import org.apache.log4j.Logger;
  import static backtype.storm.utils.Utils.tuple;
  
  
  public class TestWordCounter extends BaseBasicBolt {
      public static Logger LOG = Logger.getLogger(TestWordCounter.class);
  
      Map<String, Integer> _counts;
      
      public void prepare(Map stormConf, TopologyContext context) {
          _counts = new HashMap<String, Integer>();
      }
      
      public void execute(Tuple input, BasicOutputCollector collector) {
          String word = (String) input.getValues().get(0);
          int count = 0;
          if(_counts.containsKey(word)) {
              count = _counts.get(word);
          }
          count++;
          _counts.put(word, count);
          collector.emit(tuple(word, count));
      }
      
      public void cleanup() {
          
      }
  
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          declarer.declare(new Fields("word", "count"));
      }
  
  }