MatrixGraph.hpp

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   Copyright (C) 2004, 2005, 2007 EPFL, Politecnico di Milano, INRIA
   Copyright (C) 2010 EPFL, Politecnico di Milano, Emory UNiversity

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/*!
 *   @file
     @brief This file contains the definition of the MatrixGraph class.

     This function is used to perform an efficient assembly of FE matrices
     graph.

     @date 06/2016
     @author Davide Forti <davide.forti@epfl.ch>
 */

#ifndef MATRIXGRAPH_HPP
#define MATRIXGRAPH_HPP

#include <lifev/core/LifeV.hpp>
#include <lifev/core/mesh/RegionMesh.hpp>
#include <lifev/core/fem/ReferenceFE.hpp>
#include <lifev/core/fem/CurrentFE.hpp>
#include <lifev/core/fem/FESpace.hpp>
#include <Epetra_FECrsGraph.h>

namespace LifeV
{

class MatrixGraph
{
public:

    typedef RegionMesh< LinearTetra > mesh_Type;
    typedef boost::shared_ptr<mesh_Type>  meshPtr_Type;

    typedef Epetra_Comm comm_Type;
    typedef boost::shared_ptr< comm_Type > commPtr_Type;

    typedef Epetra_FECrsGraph graph_Type;
    typedef boost::shared_ptr<graph_Type> graphPtr_Type;

    typedef FESpace<mesh_Type, MapEpetra> fespace_Type;
    typedef boost::shared_ptr<fespace_Type> fespacePtr_Type;

    //! Constructor
    /*!
     * @param mesh - input mesh
     * @param comm - communicator
     */
    MatrixGraph( const meshPtr_Type& mesh, const commPtr_Type& comm, const ReferenceFE* refFE );

    //! Destructor
    ~MatrixGraph();

    //! @name Methods
    //@{

    //! Build the matrix graph
    /*!
     * @param numElements - data file
     * @param fe - current FE
     * @param fespace - FE space
     */
    void buildGraph( const int& numElements, CurrentFE* fe, const fespacePtr_Type& fespace, graphPtr_Type& matrix_graph );

    //@}

private:

    meshPtr_Type M_mesh;
    commPtr_Type M_comm;

    int M_numElements;
    int M_numScalarDofs;

    double ** M_elements;
    const ReferenceFE* M_referenceFE;

    int** M_rows;
    int** M_cols;

    // methods

};

} // Namespace LifeV

#endif // MATRIXGRAPH_HPP