/**
* Extracts and indexes words from the specified data reference.
*
* @throws IOException I/O Exception
*/
final void index() throws IOException {
// delete old index
abort();
final Performance perf = Prop.debug ? new Performance() : null;
Util.debug(det());
for (pre = 0; pre < size; ++pre) {
if ((pre & 0xFFFF) == 0) check();
final int k = data.kind(pre);
if (k != Data.TEXT) {
if (scm == 1 && k == Data.DOC) unit.add(pre);
continue;
}
if (scm == 2) unit.add(pre);
pos = -1;
final StopWords sw = lex.ftOpt().sw;
lex.init(data.text(pre, true));
while (lex.hasNext()) {
final byte[] tok = lex.nextToken();
++pos;
// skip too long and stopword tokens
if (tok.length <= data.meta.maxlen && (sw.size() == 0 || !sw.contains(tok))) {
// check if main memory is exhausted
if ((ntok++ & 0xFFF) == 0 && scm == 0 && memFull()) {
// currently no frequency support for tf/idf based scoring
writeIndex(csize++);
Performance.gc(2);
}
index(tok);
}
}
}
// calculate term frequencies
if (scm > 0) {
maxfreq = new int[unit.size() + 1];
ntoken = new int[nrTokens()];
token = 0;
calcFreq();
}
// write tokens
token = 0;
write();
// set meta data
if (scm > 0) {
data.meta.maxscore = max;
data.meta.minscore = min;
}
data.meta.ftxtindex = true;
Util.memory(perf);
}
@Override
public synchronized IndexIterator iter(final IndexToken it) {
final byte[] tok = it.get();
// wildcard search
final FTLexer lexer = (FTLexer) it;
final FTOpt opt = lexer.ftOpt();
if (opt.is(WC)) return wc(tok);
// fuzzy search
if (opt.is(FZ)) return fuzzy(tok, lexer.lserror(tok));
// return cached or new result
final IndexEntry e = entry(tok);
return e.size > 0 ? iter(e.offset, e.size, inZ, tok) : FTIndexIterator.FTEMPTY;
}