IndependenceSplitter.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 INDEPENDENCE_SPLITTER_GUARD
#define INDEPENDENCE_SPLITTER_GUARD
 
#include "Partition.h"
#include "Projection.h"
#include "Ideal.h"
#include <vector>
#include "MsmSlice.h"
 
class Ideal;
class Term;
 
class IndependenceSplitter {
 public:
  // Returns true if there are independent subsets of variables. The
  // other methods should only be called when the most recent call to
  // analyze returned true.
  bool analyze(const Slice& slice);
 
  size_t getVarCount() const;
 
  size_t getOneVarCount() const {return _oneVarCount;}
  size_t getTwoVarCount() const {return _twoVarCount;}
  size_t getMoreThanTwoCount() const {return _moreThanTwoVarCount;}
 
  // Get the projection to the biggest independent subset of variables.
  void getBigProjection(Projection& projection) const;
 
  // Get the projection to the rest of the variables.
  void getRestProjection(Projection& projection) const;
 
 private:
  Partition _partition;
 
  size_t _oneVarCount;
  size_t _twoVarCount;
  size_t _moreThanTwoVarCount;
 
  size_t _bigSet;
};
 
#endif