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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.
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// modification, are permitted provided that the following conditions are
// met:
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// 1. Redistributions of source code must retain the above copyright
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// contributors may be used to endorse or promote products derived from
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#ifndef STOKHOS_PRECONDITIONER_FACTORY_HPP
#define STOKHOS_PRECONDITIONER_FACTORY_HPP

#include "Teuchos_RCP.hpp"
#include "Teuchos_ParameterList.hpp"
#include "Epetra_Operator.h"
#include "Stokhos_AbstractPreconditionerFactory.hpp"

namespace Stokhos {

  //! An class for building preconditioners
  class PreconditionerFactory : public Stokhos::AbstractPreconditionerFactory {
  public:

    //! Constructor
    PreconditionerFactory(
      const std::string& prec_name,
      const Teuchos::RCP<Teuchos::ParameterList>& params);

    //! Destructor
    virtual ~PreconditionerFactory() {}

    //! Compute preconditioner operator
    virtual Teuchos::RCP<Epetra_Operator> 
    compute(const Teuchos::RCP<Epetra_Operator>& mat,
	    bool compute_prec = true);

    //! Recompute preconditioner operator for a new matrix
    virtual void
    recompute(const Teuchos::RCP<Epetra_Operator>& mat,
	      const Teuchos::RCP<Epetra_Operator>& prec);

  protected:

    //! Preconditioner factory
    Teuchos::RCP<Stokhos::AbstractPreconditionerFactory> factory;

  }; // class PreconditionerFactory

} // namespace Stokhos

#endif // STOKHOS_PRECONDITIONER_FACTORY_HPP