SplitStatusTextBolt.java

/*
 * Copyright (C) 2012 Michael Koppen
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.fhb.twitalyse.bolt.status.text;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.Map;

import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import de.fhb.twitalyse.bolt.redis.BaseRedisBolt;

/**
 * This Bolt analyses the given Twitter Status Text.
 * 
 * @author Michael Koppen <koppen@fh-brandenburg.de>
 */
public class SplitStatusTextBolt extends BaseRedisBolt {
	/**
	 * 
	 */
	private static final long serialVersionUID = -7734590864277387631L;

	private Collection<String> ignoreWords;

	public SplitStatusTextBolt(Collection<String> ignoreList, String host,
			int port) {
		super(host, port);
		this.ignoreWords = ignoreList;
	}

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

	@Override
	public void execute(Tuple input) {

		long id = input.getLong(0);
		String text = input.getString(1);

		// Split text
		text = text.toLowerCase().trim();
		List<String> splittedText = Arrays.asList(text.split(" "));

		Date today = new Date();
		SimpleDateFormat sdf = new SimpleDateFormat("dd_MM_yyyy");

		for (String word : splittedText) {
			word = word.trim();
			if (!word.equals("")) {
				// Saves # of all words
				this.incr("#words_full");
				// Saves # of words of today
				this.incr("#words_full_" + sdf.format(today));
				if (word.length() >= 3 && !ignoreWords.contains(word)) {
					collector.emit(new Values(id, word));
				}
			}
		}
		collector.ack(input);
	}

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