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TermCache.hpp

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/*==========================================================================
 * Copyright (c) 2003 University of Massachusetts.  All Rights Reserved.
 *
 * Use of the Lemur Toolkit for Language Modeling and Information Retrieval
 * is subject to the terms of the software license set forth in the LICENSE
 * file included with this software, and also available at
 * http://www.lemurproject.org/license.html
 *
 *==========================================================================
*/


//
// TermCache
//
// 19 September 2003 - tds
//

#ifndef _LEMUR_TERMCACHE_HPP
#define _LEMUR_TERMCACHE_HPP

#define TERMCACHE_MAX_TERM_LENGTH 12
#define TERMCACHE_SIZE    (64 * 1024 * 1024)
#define TERMCACHE_BUCKETS (TERMCACHE_SIZE/16)
class TermCache {
public:
  TermCache();
  void add( const char* term, int termID );
  int find( const char* term ) const;
  void clear();

private:
  int _hashFunction( const char* term ) const;

  struct cache_entry {
    char term[TERMCACHE_MAX_TERM_LENGTH];
    int id;
  };

  struct cache_entry _termCache[ TERMCACHE_SIZE / sizeof (struct cache_entry) ];
};

#endif // _LEMUR_TERMCACHE_HPP

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