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From "Kainth, Sachin" <>
Subject categorisation
Date Thu, 08 Feb 2007 17:36:19 GMT
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 =, 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); 
     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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