RedisTagsPublisherBolt.java

package com.ebottabi.bolt;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

import com.ebottabi.bolt.RedisBolt.OnDynamicConfigurationListener;
import java.util.Map;
import twitter4j.HashtagEntity;
import twitter4j.Status;

/**
 *
 * Publish the hashtags coming from the different tweets.
 *
 * @author ebot
 *
 */
public class RedisTagsPublisherBolt extends RedisBolt implements OnDynamicConfigurationListener {

    private final List<String> forbiddenTags = new LinkedList<String>();

    public RedisTagsPublisherBolt(String channel) {
        super(channel);
    }

    @Override
    protected void setupNonSerializableAttributes() {
        super.setupNonSerializableAttributes();
        setupDynamicConfiguration(this);
    }

    @Override
    public List<Object> filter(Status status) {
        if (status == null) {
            return null;
        }

        List<HashtagEntity> hashtags = Arrays.asList(status.getHashtagEntities());

        if (hashtags != null && hashtags.size() > 0) {
            for (HashtagEntity tag : hashtags) {
                if (!forbiddenTags.contains(tag.getText().toLowerCase())) {
                    publish(tag.getText().toLowerCase());
                }
            }
        }

        return null;
    }

    @Override
    public void onConfigurationChange(String conf) {
        //Utils.StringToList(conf, forbiddenTags);
    }

    @Override
    public Map<String, Object> getComponentConfiguration() {
        return null;
    }
}