public class TweeterCorpusLoader extends CorpusLoader {
@Override
public CorpusHolder loadCorpus(String fileName) {
CorpusHolder theCorpus = new CorpusHolder();
TweetReader theReader = new TweetReader();
ArrayList<DataUnit> allTweets = theReader.getData(fileName);
String polarity;
String tweet;
String[] tokens;
ArrayList<DataUnit> posExs = new ArrayList<DataUnit>();
ArrayList<DataUnit> negExs = new ArrayList<DataUnit>();