private TrigramCollocation trigramParsing(
Map<String, Integer> trigram, String text, TrigramCollocation previousWords) {
Matcher matcher = pattern.matcher(text);
int begIndex = 0;
TrigramCollocation begWords = previousWords;
String word;
while (matcher.find()) {
word = text.substring(begIndex, matcher.start()).toLowerCase();
if (word.length() > 1) {
if (!StopWordsHelper.INSTANCE.isStopWord(word)) {
if (begWords.addWord(word)) {
countWord(trigram, begWords.toString());
begWords.shiftWords();
}
if (!" ".equals(matcher.group())) {
begWords.clear();
}
}
} else {
begWords.clear();
}
begIndex = matcher.end();
}
if (begIndex != text.length()) {
word = text.substring(begIndex).toLowerCase();
if (!StopWordsHelper.INSTANCE.isStopWord(word)) {
if (begWords.addWord(word)) {
countWord(trigram, begWords.toString());
begWords.shiftWords();
}
}
}
return begWords;
}
private String bigramParsing(Map<String, Integer> bigram, String text, String previousWord) {
Matcher matcher = pattern.matcher(text);
int begIndex = 0;
String begWord = previousWord;
String collocation, word;
while (matcher.find()) {
word = text.substring(begIndex, matcher.start()).toLowerCase();
if (word.length() > 1) {
if (!StopWordsHelper.INSTANCE.isStopWord(word)) {
if (begWord != null) {
collocation = new StringBuilder(begWord).append(" ").append(word).toString();
countWord(bigram, collocation);
}
begWord = " ".equals(matcher.group()) ? word : null;
}
} else {
begWord = null;
}
begIndex = matcher.end();
}
if (begIndex != text.length()) {
word = text.substring(begIndex).toLowerCase();
if (!StopWordsHelper.INSTANCE.isStopWord(word)) {
if (begWord != null) {
collocation = new StringBuilder(begWord).append(" ").append(word).toString();
countWord(bigram, collocation);
}
begWord = word;
}
}
return begWord;
}
private void countWord(Map<String, Integer> map, String collocation) {
if (!StopWordsHelper.INSTANCE.isStopWord(collocation)) {
Integer count = map.get(collocation);
if (count == null) {
count = 0;
}
map.put(collocation, ++count);
}
}
private void unigramParsing(Map<String, Integer> unigram, String text) {
String lowerCaseWord;
for (String word : text.split(WORD_SPLITTING_REGEX)) {
lowerCaseWord = word.toLowerCase();
if (!StopWordsHelper.INSTANCE.isStopWord(lowerCaseWord)) {
countWord(unigram, lowerCaseWord);
}
}
}