/* -*- mode: c++ -*- 
*/
/* 

    GIFT, a flexible content based image retrieval system.
    Copyright (C) 1998, 1999, 2000 CUI, University of Geneva

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
// -*- mode: c++ -*-
#ifndef _CWEIGHTER
#define _CWEIGHTER
class CWeightingFunction;
class CQueryNormalizer;
class CAcInvertedFile;
/**
   A weighter is a set of WeightingFunction and 
   normalizers which are going to be used together.

   Also:
   The content of the weighting function factory

   @author Wolfgang Müller
*/
class CWeighter{
  /** */
  CWeightingFunction* mWeightingFunction;
  /** */
  CQueryNormalizer* mDocumentNormalizer;
  /** */
  CQueryNormalizer* mQueryNormalizer;
public:
  /** constructor */
  CWeighter(CWeightingFunction* inWeightingFunction=0,
	    CQueryNormalizer* inDocumentNormalizer=0,
	    CQueryNormalizer* inQueryNormalizer=0);
  /** 
      make the weighting function know who its normalizers are
  */
  void init();
  /** 
      Set for all content the accessor properly and then call init.
  */
  void setAccessor(CAcInvertedFile& inAccessor);
  /** 
      clone: clone an init-ed copy of this
  */
  CWeighter* clone()const;
  
  /** destructor: deletes all content. */
  ~CWeighter();

  /** */
  CWeightingFunction* getWeightingFunction()const;
  /** */
  CQueryNormalizer* getDocumentNormalizer()const;
  /** */
  CQueryNormalizer* getQueryNormalizer()const;
};

#endif
