* permitted in search results, and false for those that should
* not.
*/
public BitSet bits(IndexReader reader) throws IOException {
BitSet bits = new BitSet(reader.maxDoc());
TermEnum enumerator =
(null != lowerTerm
? reader.terms(new Term(fieldName, lowerTerm))
: reader.terms(new Term(fieldName,"")));
try {
if (enumerator.term() == null) {
return bits;
}
boolean checkLower = false;
if (!includeLower) // make adjustments to set to exclusive
checkLower = true;
TermDocs termDocs = reader.termDocs();
try {
do {
Term term = enumerator.term();
if (term != null && term.field().equals(fieldName)) {
if (!checkLower || null==lowerTerm || term.text().compareTo(lowerTerm) > 0) {
checkLower = false;
if (upperTerm != null) {
int compare = upperTerm.compareTo(term.text());
/* if beyond the upper term, or is exclusive and
* this is equal to the upper term, break out */
if ((compare < 0) ||
(!includeUpper && compare==0)) {
break;
}
}
/* we have a good term, find the docs */
termDocs.seek(enumerator.term());
while (termDocs.next()) {
bits.set(termDocs.doc());
}
}
} else {
break;
}
}
while (enumerator.next());
} finally {
termDocs.close();
}
} finally {
enumerator.close();
}
return bits;
}