HashtagAndTweetBolt.java

package mypackage.bolts;

import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import twitter4j.HashtagEntity;
import twitter4j.Status;

import java.util.Map;

/**
 * Gets a Tweet status and emits shortened urls along with their expansion if any.
 *
 * @author Michael Vogiatzis
 *
 */
public class HashtagAndTweetBolt extends BaseRichBolt{
	private OutputCollector ouc;

	@Override
	public void prepare(Map stormConf, TopologyContext context,
						OutputCollector collector) {
		ouc = collector;
	}

	@Override
	public void execute(Tuple tuple) {
		Status s = (Status) tuple.getValueByField("tweet");
		//Status s1 = (Status) tuple.getValueByField("tweet");
		//URLEntity[] urls = s.getURLEntities();
		System.out.println("the text is here===================="+s.getText());
//		long startTimeMs = System.currentTimeMillis( );
//		String time=""+startTimeMs;

		String tweet_text=s.getText();
		HashtagEntity[] urls=s.getHashtagEntities();

		for (HashtagEntity htag : urls){
			String shortURL = htag.getText();
			System.out.println("the output of hashtag is "+shortURL);
			//String tweet_text = htag.getText();
			System.out.println("the output of tweet is == "+tweet_text);
			if (tweet_text!=null)
			{ouc.emit(new Values(shortURL, tweet_text));
			}
		}

		ouc.ack(tuple);
	}

	@Override
	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		declarer.declare(new Fields("shortUrl", "expUrl"));
	}





}