On Feb 8, 2007, at 12:36 PM, Kainth, Sachin wrote:
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?
"all" is a BitSet lit up for the documents that matched "query".
"these" (the BitSet for a particular category) is .anded with "all"
to get the counts _left over_ for each category given "query".
Make sense?
Erik
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