void addTokensToFreqMap(String document) {
for (String s : new HashSet<String>(extractTokens(document))) {
if (s.length() > 1) {
docFreqMap.update(s);
}
}
++docCount;
}
void addToTfIdf(String document) {
CountingMap termFreq = new CountingMap();
for (String s : extractTokens(document)) {
if (s.length() > 1) {
termFreq.update(s);
}
}
for (Map.Entry<String, Integer> entry : termFreq.entrySet()) {
String token = entry.getKey();
if (termFreq.containsKey(token)) {
int df = docFreqMap.get(token);
if (df < minimalDocFrequency) {
continue;
}
double f = (double) docCount / docFreqMap.get(token);
double tfIdf = (double) termFreq.get(token) * Math.log(f);
bondedSet.add(new Token(token, tfIdf));
}
}
}