TermGrader.h

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/* Frobby: Software for monomial ideal computations.
   Copyright (C) 2007 Bjarke Hammersholt Roune (www.broune.com)
 
   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, see http://www.gnu.org/licenses/.
*/
#ifndef TERM_GRADER_GUARD
#define TERM_GRADER_GUARD
 
#include <vector>
 
class Projection;
class Term;
class TermTranslator;
 
class TermGrader {
public:
  TermGrader(const vector<mpz_class>& varDegrees,
             const TermTranslator& translator);
 
  mpz_class getDegree(const Term& term) const;
 
  void getDegree(const Term& term, mpz_class& degree) const;
 
  void getDegree(const Term& term,
                 const Projection& projection,
                 mpz_class& degree) const;
 
  void getUpperBound(const Term& divisor,
                     const Term& dominator,
                     mpz_class& bound) const;
 
  mpz_class getUpperBound(const Term& divisor,
                          const Term& dominator) const;
 
  Exponent getLargestLessThan2(size_t var,
                               const mpz_class& value, bool strict = true) const;
 
  Exponent getLargestLessThan2(size_t var, Exponent from, Exponent to,
                              const mpz_class& value, bool strict =
                              true) const;
 
  void getIncrementedDegree(const Term& term,
                            const Projection& projection,
                            mpz_class& degree) const;
 
  bool getMinIndexLessThan(size_t var,
                           Exponent from,
                           Exponent to,
                           Exponent& index,
                           const mpz_class& maxDegree) const;
 
  bool getMaxIndexLessThan(size_t var,
                           Exponent from,
                           Exponent to,
                           Exponent& index,
                           const mpz_class& maxDegree) const;
 
 
  const mpz_class& getGrade(size_t var, Exponent exponent) const;
 
  Exponent getMaxExponent(size_t var) const;
 
  size_t getVarCount() const;
 
  void print(ostream& out) const;
 
  int getGradeSign(size_t var) const;
 
private:
  vector<vector<mpz_class> > _grades;
  vector<int> _signs;
};
 
ostream& operator<<(ostream& out, const TermGrader& grader);
 
#endif