AbsHMatrix.h

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/* Copyright 2008-2010, Technische Universitaet Muenchen,
   Authors: Christian Hoeppner & Sebastian Neubert & Johannes Rauch

   This file is part of GENFIT.

   GENFIT is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   GENFIT 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with GENFIT.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef genfit_AbsHMatrix_h
#define genfit_AbsHMatrix_h

#include <TObject.h>
#include <TMatrixDSym.h>
#include <TVectorD.h>

namespace genfit {

class AbsHMatrix : public TObject {

 public:
  AbsHMatrix() { ; }

  virtual ~AbsHMatrix() { ; }

  virtual const TMatrixD &getMatrix() const = 0;

  virtual TVectorD Hv(const TVectorD &v) const { return getMatrix() * v; }

  virtual TMatrixD MHt(const TMatrixDSym &M) const { return TMatrixD(M, TMatrixD::kMultTranspose, getMatrix()); }
  virtual TMatrixD MHt(const TMatrixD &M) const { return TMatrixD(M, TMatrixD::kMultTranspose, getMatrix()); }

  virtual void HMHt(TMatrixDSym &M) const { M.Similarity(getMatrix()); }

  virtual AbsHMatrix *clone() const = 0;

  bool operator==(const AbsHMatrix &other) const { return this->isEqual(other); }
  bool operator!=(const AbsHMatrix &other) const { return !(this->isEqual(other)); }
  virtual bool isEqual(const AbsHMatrix &other) const = 0;

  virtual void Print(const Option_t * = "") const { ; }

 protected:
  // protect from calling copy c'tor or assignment operator from outside the class. Use #clone() if you want a copy!
  AbsHMatrix(const AbsHMatrix &o) : TObject(o) { ; }
  AbsHMatrix &operator=(const AbsHMatrix &);

 public:
  ClassDef(AbsHMatrix, 1)
};

} /* End of namespace genfit */
#endif // genfit_AbsHMatrix_h