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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"

//------------------------------------------------------------
//      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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