/** {@inheritDoc} */
public ResultSet match(String queryNumber, MatchingQueryTerms queryTerms) throws IOException {
final long starttime = System.currentTimeMillis();
initialise(queryTerms);
plm = new PostingListManager(index, super.collectionStatistics, queryTerms);
if (MATCH_EMPTY_QUERY && plm.size() == 0) {
// Check whether we need to match an empty query. If so, then return the existing result set.
resultSet = new CollectionResultSet(collectionStatistics.getNumberOfDocuments());
resultSet.setExactResultSize(collectionStatistics.getNumberOfDocuments());
resultSet.setResultSize(collectionStatistics.getNumberOfDocuments());
return resultSet;
}
// DO NOT prepare the posting lists for TAAT retrieval
plm.prepare(false);
for (int i = 0; i < plm.size(); i++) {
assignScores(i, (AccumulatorResultSet) resultSet, plm.getPosting(i));
}
resultSet.initialise();
this.numberOfRetrievedDocuments = resultSet.getExactResultSize();
finalise(queryTerms);
if (logger.isDebugEnabled())
logger.debug(
"Time to match "
+ numberOfRetrievedDocuments
+ " results: "
+ (System.currentTimeMillis() - starttime)
+ "ms");
return resultSet;
}
protected void assignScores(int i, AccumulatorResultSet rs, final IterablePosting postings)
throws IOException {
int docid;
double score;
short mask = 0;
if (i < 16) mask = (short) (1 << i);
while (postings.next() != IterablePosting.EOL) {
score = plm.score(i);
docid = postings.getId();
// logger.info("Docid=" + docid + " score=" + score);
if ((!rs.scoresMap.contains(docid)) && (score > 0.0d)) numberOfRetrievedDocuments++;
else if ((rs.scoresMap.contains(docid)) && (score < 0.0d)) numberOfRetrievedDocuments--;
rs.scoresMap.adjustOrPutValue(docid, score, score);
rs.occurrencesMap.put(docid, (short) (rs.occurrencesMap.get(docid) | mask));
}
}
