libtrilinos-muelu-dev 12.4.2-2 / usr / include / trilinos / MueLu_EpetraOperator.hpp

// @HEADER
//
// ***********************************************************************
//
//        MueLu: A package for multigrid based preconditioning
//                  Copyright 2012 Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact
//                    Jonathan Hu       (jhu@sandia.gov)
//                    Andrey Prokopenko (aprokop@sandia.gov)
//                    Ray Tuminaro      (rstumin@sandia.gov)
//
// ***********************************************************************
//
// @HEADER
#ifndef MUELU_EPETRAOPERATOR_HPP
#define MUELU_EPETRAOPERATOR_HPP

//! @file 

#include <Epetra_Operator.h>
#include "MueLu_Hierarchy.hpp"
//TODO: Kokkos headers

namespace MueLu {

/*! @class EpetraOperator
    @brief Turns a MueLu::Hierarchy into a Epetra_Operator.
    It allows MueLu to be used as a preconditioner for AztecOO (for instance).
*/
  class EpetraOperator : public Epetra_Operator {
    typedef double                                              SC;
    typedef int                                                 LO;
    typedef int                                                 GO;
    typedef KokkosClassic::DefaultNode::DefaultNodeType         NO;

    typedef Xpetra::Matrix<SC,LO,GO,NO>                     Matrix;
    typedef MueLu::Hierarchy<SC,LO,GO,NO>                   Hierarchy;
    typedef MueLu::Utils<SC,LO,GO,NO>                       Utils;

  public:

    //! @name Constructor/Destructor
    //@{

    //! Constructor
    EpetraOperator(const RCP<Hierarchy>& H) : Hierarchy_(H) { }

    //! Destructor.
    virtual ~EpetraOperator() { }

    //@}

    int SetUseTranspose(bool UseTransposeBool) { return -1; }

    //! @name Mathematical functions
    //@{

    //! Returns the result of a Epetra_Operator applied to a Epetra_MultiVector X in Y.
    /*!
      \param In
      X - A Epetra_MultiVector of dimension NumVectors to multiply with matrix.
      \param Out
      Y -A Epetra_MultiVector of dimension NumVectors containing result.

      \return Integer error code, set to 0 if successful.
    */
    int Apply(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const { return -1; }

    //! Returns the result of a Epetra_Operator inverse applied to an Epetra_MultiVector X in Y.
    /*!
      \param In
      X - A Epetra_MultiVector of dimension NumVectors to solve for.
      \param Out
      Y -A Epetra_MultiVector of dimension NumVectors containing result.

      \return Integer error code, set to 0 if successful.

      \warning In order to work with AztecOO, any implementation of this method must
      support the case where X and Y are the same object.
    */
    int ApplyInverse(const Epetra_MultiVector& X, Epetra_MultiVector& Y) const;

    //! Returns the infinity norm of the global matrix.
    /* Returns the quantity \f$ \| A \|_\infty\f$ such that
       \f[\| A \|_\infty = \max_{1\lei\lem} \sum_{j=1}^n |a_{ij}| \f].

       \warning This method must not be called unless HasNormInf() returns true.
    */
    double NormInf() const { return 0; }
    //@}

    //! @name Attribute access functions
    //@{

    //! Returns a character string describing the operator
    const char * Label() const { return "MueLu::Hierarchy"; }

    //! Returns the current UseTranspose setting.
    bool UseTranspose() const { return false; }

    //! Returns true if the \e this object can provide an approximate Inf-norm, false otherwise.
    bool HasNormInf() const { return 0; }

    //! Returns a pointer to the Epetra_Comm communicator associated with this operator.
    const Epetra_Comm & Comm() const;

    //! Returns the Epetra_Map object associated with the domain of this operator.
    const Epetra_Map & OperatorDomainMap() const;

    //! Returns the Epetra_Map object associated with the range of this operator.
    const Epetra_Map & OperatorRangeMap() const;

    //@}

    //! @name MueLu specific
    //@{

    //! Direct access to the underlying MueLu::Hierarchy.
    RCP<Hierarchy> GetHierarchy() const { return Hierarchy_; }

    //@}


  private:

    RCP<Hierarchy> Hierarchy_;

  };

} // namespace

#endif // MUELU_EPETRAOPERATOR_HPP