@Override
public List<Token> tokenize(String text) {
if (text == null || text.trim().length() == 0) return null;
List<Token> tokens = new ArrayList<Token>();
Map<Integer, Token> filteredTokenMap =
new HashMap<Integer, Token>(); // 전처리 과정에서 PREDEFINED_TOKEN_PATTERN 에 의해 걸러진 토큰들
StringBuilder buf = new StringBuilder(text);
List<Token> filteredTokens = filterPredefinedPatterns(buf, filteredTokenMap);
tokens.addAll(filteredTokens);
char ch;
String temp = "";
CharType currCharType = CharType.ETC;
CharType prevCharType;
int tokenIndex = 0;
for (int i = 0, len = text.length(); i < len; i++) {
ch = buf.charAt(i);
prevCharType = currCharType;
if (filteredTokenMap.containsKey(i)) {
currCharType = CharType.FILTERED;
} else {
currCharType = determineCharType(ch);
}
if (i != 0) {
if (prevCharType != currCharType) {
// System.out.println("["+i+"]prevCharType != currCharType =>"+ temp +
// "," + ch +"," + prevCharType + "," + currCharType);
if (prevCharType != CharType.FILTERED) {
// System.out.println(" created token:"+ temp + "," +
// prevCharType);
tokens.add(new Token(temp, prevCharType, tokenIndex));
}
tokenIndex = i;
temp = "";
}
}
temp = (new StringBuilder(String.valueOf(temp))).append(ch).toString();
}
if (temp.trim().length() > 0) {
Token t = new Token(temp, currCharType, tokenIndex);
tokens.add(t);
}
Collections.sort(tokens);
return tokens;
}
// 미리 정의된 패턴과 일치하는 부분을 걸러낸다 (ㅜㅜ, 숫자 등)
private List<Token> filterPredefinedPatterns(
StringBuilder buf, Map<Integer, Token> filteredTokenMap) {
List<Token> result = new ArrayList<Token>();
FilterTokenPattern[] predefinedPatterns = FilterTokenPattern.getPredefinedPatterns();
List<Token> filteredTokens;
for (FilterTokenPattern each : predefinedPatterns) {
filteredTokens = match(buf, each, filteredTokenMap);
if (filteredTokens.size() > 0) {
result.addAll(filteredTokens);
}
}
return result;
}
// 패턴에 매칭되는 토큰 리스트를 만든다.
private List<Token> match(
StringBuilder text, FilterTokenPattern tokenPattern, Map<Integer, Token> filteredTokenMap) {
List<Token> tokenList = new ArrayList<Token>();
for (Matcher matcher = tokenPattern.getPattern().matcher(text); matcher.find(); ) {
Token token =
new Token(
text.substring(matcher.start(), matcher.end()),
tokenPattern.getCharType(),
matcher.start());
tokenList.add(token);
markFiltered(text, matcher.start(), matcher.end(), token, filteredTokenMap);
}
return tokenList;
}