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/******************************************************************************
*       SOFA, Simulation Open-Framework Architecture, version 1.0 beta 4      *
*                (c) 2006-2009 MGH, INRIA, USTL, UJF, CNRS                    *
*                                                                             *
* This library 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 2.1 of the License, or (at     *
* your option) any later version.                                             *
*                                                                             *
* This library 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 this library; if not, write to the Free Software Foundation,     *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.          *
*******************************************************************************
*                               SOFA :: Modules                               *
*                                                                             *
* Authors: The SOFA Team and external contributors (see Authors.txt)          *
*                                                                             *
* Contact information: contact@sofa-framework.org                             *
******************************************************************************/
#ifndef SOFA_COMPONENT_LINEARSOLVER_SSORPRECONDITIONER_H
#define SOFA_COMPONENT_LINEARSOLVER_SSORPRECONDITIONER_H

#include <sofa/core/componentmodel/behavior/LinearSolver.h>
#include <sofa/component/linearsolver/MatrixLinearSolver.h>
#include <sofa/simulation/common/MechanicalVisitor.h>
#include <sofa/component/linearsolver/SparseMatrix.h>
#include <sofa/component/linearsolver/FullMatrix.h>
#include <sofa/helper/map.h>

#include <math.h>

namespace sofa {

namespace component {

namespace linearsolver {

/// Linear system solver using the conjugate gradient iterative algorithm
template<class TMatrix, class TVector>
class SSORPreconditioner : public sofa::component::linearsolver::MatrixLinearSolver<TMatrix,TVector>, public virtual sofa::core::objectmodel::BaseObject {
public:
    typedef TMatrix Matrix;
    typedef TVector Vector;
    typedef sofa::component::linearsolver::MatrixLinearSolver<TMatrix,TVector> Inherit;
    typedef sofa::core::componentmodel::behavior::BaseMechanicalState::VecId VecId;

    Data<bool> f_verbose;
    Data<std::map < std::string, sofa::helper::vector<double> > > f_graph;

    SSORPreconditioner();
    void solve (Matrix& M, Vector& x, Vector& b);
    void invert(Matrix& M);

private :
	unsigned bsize;
	std::vector<double> inv_diag;
};

} // namespace linearsolver

} // namespace component

} // namespace sofa

#endif