lucene-java-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Kainth, Sachin" <Sachin.Kai...@atkinsglobal.com>
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 = 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?



This email and any attached files are confidential and copyright protected. If you are not
the addressee, any dissemination of this communication is strictly prohibited. Unless otherwise
expressly agreed in writing, nothing stated in this communication shall be legally binding.

The ultimate parent company of the Atkins Group is WS Atkins plc.  Registered in England No.
1885586.  Registered Office Woodcote Grove, Ashley Road, Epsom, Surrey KT18 5BW.

Consider the environment. Please don't print this e-mail unless you really need to. 

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message