ScoreFunction.hpp

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/*==========================================================================
 * Copyright (c) 2001 Carnegie Mellon University.  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
 *
 *==========================================================================
 */


#ifndef _SCOREFUNCTION_HPP
#define _SCOREFUNCTION_HPP

#include "TextQueryRep.hpp"
#include "DocumentRep.hpp"

namespace lemur 
{
  namespace api
  {
    
    //------------------------------------------------------------
    //      Abstract Interface for Inverted index based Retrieval Function 
    //------------------------------------------------------------


    class ScoreFunction {
    public:
      virtual double matchedTermWeight(const QueryTerm *qTerm, const TextQueryRep *qRep, const DocInfo *info, const DocumentRep *dRep) const { 
        return (qTerm->weight()*dRep->termWeight(qTerm->id(),info));
      }
            
      virtual double adjustedScore(double origScore, const TextQueryRep *qRep, const DocumentRep *dRep) const {
        return origScore; 
      }
    };
  }
}
#endif /* _SCOREFUNCTION_HPP */

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