Chris has given an example of how to perform categorisation of lucene searches:
String[] mfgs = ...;
String query = "+category:cameras +price:[0 to 10]";
Query q = QueryParser.parse(query);
Hits results = searcher.search(q, mySort)
BitSet all = (new QueryFilter(q)).bits(reader)
int[] mfg_counts = new int[mfgs.length];
for i in (0 to mfgs.length) {
BitSet these = (new QueryFilter(new
TermQuery("mfg",mfgs[i]))).bits(reader);
these.and(all)
mfg_counts[i] = these.cardinality();
}
What I don't understand though is what this line does:
BitSet all = (new QueryFilter(q)).bits(reader)
Anyone have any ideas?
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