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// @HEADER
// ***********************************************************************
// 
//                           Stokhos Package
//                 Copyright (2009) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// 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
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Eric T. Phipps (etphipp@sandia.gov).
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// ***********************************************************************
// @HEADER

#ifndef STOKHOS_SG_PRECONDITIONER_FACTORY_HPP
#define STOKHOS_SG_PRECONDITIONER_FACTORY_HPP

#include "Teuchos_RCP.hpp"
#include "Teuchos_ParameterList.hpp"
#include "Stokhos_SGPreconditioner.hpp"
#include "EpetraExt_MultiComm.h"
#include "Stokhos_OrthogPolyBasis.hpp"
#include "Stokhos_EpetraSparse3Tensor.hpp"
#include "Epetra_Map.h"
#include "Stokhos_AbstractPreconditionerFactory.hpp"

namespace Stokhos {

  //! Factory for generating stochastic Galerkin preconditioners
  class SGPreconditionerFactory {
  public:

    //! Constructor
    SGPreconditionerFactory(
      const Teuchos::RCP<Teuchos::ParameterList>& params);

    //! Destructor
    virtual ~SGPreconditionerFactory() {}

    //! Return whether a preconditioner will be supported
    virtual bool isPrecSupported() const;

    //! Build preconditioner operator
    virtual Teuchos::RCP<Stokhos::SGPreconditioner> 
    build(
      const Teuchos::RCP<const EpetraExt::MultiComm>& sg_comm,
      const Teuchos::RCP<const Stokhos::OrthogPolyBasis<int,double> >& sg_basis,
      const Teuchos::RCP<const Stokhos::EpetraSparse3Tensor>& epetraCijk,
      const Teuchos::RCP<const Epetra_Map>& base_map,
      const Teuchos::RCP<const Epetra_Map>& sg_map);

  protected:

    //! Build preconditioner factory for mean
    Teuchos::RCP<Stokhos::AbstractPreconditionerFactory> 
    buildMeanPreconditionerFactory();

  private:
    
    //! Private to prohibit copying
    SGPreconditionerFactory(const SGPreconditionerFactory&);
    
    //! Private to prohibit copying
    SGPreconditionerFactory& operator=(const SGPreconditionerFactory&);

  protected:

    //! Preconditioner parameters
    Teuchos::RCP<Teuchos::ParameterList> params;

    //! Preconditioner method
    std::string prec_method;

  }; // class SGPreconditionerFactory

} // namespace Stokhos

#endif // STOKHOS_SG_PRECONDITIONER_FACTORY_HPP