Stokhos_MPBlockDiagonalPreconditioner.hpp

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// @HEADER
// *****************************************************************************
//                           Stokhos Package
//
// Copyright 2009 NTESS and the Stokhos contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef STOKHOS_MP_BLOCK_DIAGONAL_PRECONDITIONER_HPP
#define STOKHOS_MP_BLOCK_DIAGONAL_PRECONDITIONER_HPP

#include "Teuchos_RCP.hpp"

#include "Stokhos_MPPreconditioner.hpp"
#include "EpetraExt_MultiComm.h"
#include "Epetra_Map.h"
#include "Stokhos_AbstractPreconditionerFactory.hpp"
#include "Teuchos_ParameterList.hpp"
#include "Teuchos_Array.hpp"

namespace Stokhos {
    
  class MPBlockDiagonalPreconditioner : public Stokhos::MPPreconditioner {
      
  public:

    MPBlockDiagonalPreconditioner(
      const Teuchos::RCP<const EpetraExt::MultiComm>& mp_comm,
      int num_mp_blocks,
      const Teuchos::RCP<const Epetra_Map>& base_map,
      const Teuchos::RCP<const Epetra_Map>& mp_map,
      const Teuchos::RCP<Stokhos::AbstractPreconditionerFactory>& prec_factory,
      const Teuchos::RCP<Teuchos::ParameterList>& params);
    
    virtual ~MPBlockDiagonalPreconditioner();


    virtual void 
    setupPreconditioner(
      const Teuchos::RCP<Stokhos::BlockDiagonalOperator>& mp_op, 
      const Epetra_Vector& x);


    
    virtual int SetUseTranspose(bool UseTranspose);
    
    virtual int Apply(const Epetra_MultiVector& Input, 
                      Epetra_MultiVector& Result) const;

    virtual int ApplyInverse(const Epetra_MultiVector& X, 
                             Epetra_MultiVector& Y) const;
    
    virtual double NormInf() const;
    
    virtual const char* Label () const;
  
    virtual bool UseTranspose() const;
    
    virtual bool HasNormInf() const;

    virtual const Epetra_Comm & Comm() const;

    virtual const Epetra_Map& OperatorDomainMap () const;

    virtual const Epetra_Map& OperatorRangeMap () const;


  private:
    
    MPBlockDiagonalPreconditioner(const MPBlockDiagonalPreconditioner&);
    
    MPBlockDiagonalPreconditioner& operator=(const MPBlockDiagonalPreconditioner&);
    
  protected:
    
    std::string label;

    Teuchos::RCP<const EpetraExt::MultiComm> mp_comm;

    int num_mp_blocks;
    
    Teuchos::RCP<const Epetra_Map> base_map;

    Teuchos::RCP<const Epetra_Map> mp_map;

    Teuchos::RCP<Stokhos::AbstractPreconditionerFactory> prec_factory;

    Teuchos::Array< Teuchos::RCP<Epetra_Operator> > block_precs;

    bool useTranspose;

  }; // class MPBlockDiagonalPreconditioner
  
} // namespace Stokhos

#endif // STOKHOS_MP_BLOCK_DIAGONAL_PRECONDITIONER_HPP