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TextQueryRetMethod.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.cs.cmu.edu/~lemur/license.html
 *
 *==========================================================================
*/


#ifndef _TEXTQUERYRETMETHOD_HPP
#define _TEXTQUERYRETMETHOD_HPP


#include "RetrievalMethod.hpp"
#include "TextQueryRep.hpp"
#include "DocumentRep.hpp"
#include "ScoreFunction.hpp"
#include "ScoreAccumulator.hpp"
#include "FreqVector.hpp"

//----------------------------------------------------------------------
//      Abstract Interface for A Retrieval Method/Model for Text Query
//----------------------------------------------------------------------

class TextQueryRetMethod : public RetrievalMethod {
public:
  TextQueryRetMethod(Index &ind, ScoreAccumulator & accumulator) : 
    RetrievalMethod(ind), scAcc(accumulator) {}
  virtual ~TextQueryRetMethod() {}
  virtual TextQueryRep *computeTextQueryRep(TextQuery &qry)=0;

  virtual QueryRep *computeQueryRep(Query &qry); 

  virtual double scoreDoc(QueryRep &qry, int docID);
  virtual void scoreCollection(QueryRep &qry, IndexedRealVector &results);

  virtual DocumentRep *computeDocRep(int docID) =0;
  virtual ScoreFunction *scoreFunc() = 0;
  virtual void updateQuery(QueryRep &qryRep, DocIDSet &relDocs) {
    updateTextQuery(*((TextQueryRep *)(&qryRep)), relDocs);
  }

  virtual void updateTextQuery(TextQueryRep &qryRep, DocIDSet &relDocs)=0;


  virtual void scoreInvertedIndex(QueryRep &qryRep, IndexedRealVector &scores, bool scoreAll=false);

  virtual double scoreDocVector(TextQueryRep &qry, int docID, FreqVector &docVector);

protected:
  ScoreAccumulator &scAcc;
};


//=============== inlines ========================================

inline QueryRep *TextQueryRetMethod::computeQueryRep(Query &qry) { 
  TextQuery *q = static_cast<TextQuery *>(&qry);
  return (computeTextQueryRep(*q));
}

#endif /* _TEXTQUERYRETMETHOD_HPP */

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