cpp/galago/include/BinnedFeatureIndex.hpp

   1
   2 //
   3 // BinnedFeatureIndex
   4 //
   5 // 5 January 2007 -- tds
   6 //
   7
   8 #ifndef GALAGO_BINNEDFEATUREINDEX_HPP
   9 #define GALAGO_BINNEDFEATUREINDEX_HPP
  10
  11 #include "indri/Parameters.hpp"
  12 #include "BinOrderedBinnedIterator.hpp"
  13 #include "Stemmer.hpp"
  14 #include "Normalizer.hpp"
  15 #include "Query.hpp"
  16 #include "Stopper.hpp"
  17 #include "IndexReader.hpp"
  18
  19 #define BINNEDFEATUREINDEX_MAX_TERM_LENGTH (512)
  20 #define BINNEDFEATUREINDEX_VOCAB_GROUP (16)
  21 #define BINNEDFEATUREINDEX_BLOCK_SIZE (1<<16)
  22
  23 class BinnedFeatureIndex {
  24 private:
  25     IndexReader _reader;
  26
  27     Stemmer* stemmer;
  28     Stopper* stopper;
  29     Normalizer normalizer;
  30
  31     UINT64 _maximumDocumentCount;
  32     bool _requiresWeighting;
  33
  34     void _build_stemmer();
  35     void _build_stopper();
  36
  37 public:
  38     static const int blockSize = BINNEDFEATUREINDEX_BLOCK_SIZE;
  39     static const int vocabGroup = BINNEDFEATUREINDEX_VOCAB_GROUP;
  40     static const char maxTermLength = BINNEDFEATUREINDEX_MAX_TERM_LENGTH;
  41
  42 public:
  43     BinnedFeatureIndex();
  44     ~BinnedFeatureIndex();
  45
  46     void openRead( const std::string& indexPath );
  47     void close();
  48     BinOrderedBinnedIterator* getTerm( const std::string& term ) const;
  49     QueryTerm processTerm( const QueryTerm& term ) const;
  50     UINT64 maximumDocumentCount() const;
  51     bool requiresWeighting() const;
  52 };
  53
  54 #endif // GALAGO_BINNEDFEATUREINDEX_HPP