MaximalStandardAction.cpp

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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/.
*/
#include "stdinc.h"
#include "MaximalStandardAction.h"
 
#include "SliceFacade.h"
#include "SliceParams.h"
#include "DataType.h"
 
MaximalStandardAction::MaximalStandardAction():
  Action
(staticGetName(),
 "Compute the maximal standard monomials of the input ideal.",
 "Compute the maximal standard monomials of the input ideal. A standard "
 "monomial\nis a monomial that does not lie in the ideal, while a "
 "maximal\nstandard monomial m is a standard monomial such that m * v does "
 "lie in the\nideal for every variable v in the ambient polynomial ring of I.",
 false),
 
  _io(DataType::getMonomialIdealType(), DataType::getMonomialIdealType()),
 
  _increment
  ("increment",
   "Increase each entry of the output by 1 to compute maximal staircase\n"
   "monomials in place of maximal standard monomials.",
   false) {
}
 
const char* MaximalStandardAction::staticGetName() {
  return "maxstandard";
}
 
void MaximalStandardAction::obtainParameters(vector<Parameter*>& parameters) {
  _io.obtainParameters(parameters);
  _sliceParams.obtainParameters(parameters);
  parameters.push_back(&_increment);
  Action::obtainParameters(parameters);
}
 
void MaximalStandardAction::perform() {
  SliceParams params(_params);
  validateSplit(params, true, false);
  SliceFacade facade(params, DataType::getMonomialIdealListType());
  if (_increment)
    facade.computeMaximalStaircaseMonomials();
  else
    facade.computeMaximalStandardMonomials();
}