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// @HEADER
// ***********************************************************************
// 
//         Stratimikos: Thyra-based strategies for linear solvers
//                Copyright (2006) 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
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// 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 Roscoe A. Bartlett (rabartl@sandia.gov) 
// 
// ***********************************************************************
// @HEADER

#ifndef THYRA_ML_PRECONDITIONER_FACTORY_DECL_HPP
#define THYRA_ML_PRECONDITIONER_FACTORY_DECL_HPP


#include "Thyra_PreconditionerFactoryBase.hpp"
#include "Thyra_EpetraOperatorViewExtractorBase.hpp"
#include "Teuchos_StandardCompositionMacros.hpp"

namespace Thyra {


/** \brief Concrete preconditioner factory subclass based on ML.
 *
 * For information on ML and its available options, please see the ML <A HREF=http://trilinos.sandia.gov/packages/ml/index.html>home page</A> or the ML User <A HREF="http://trilinos.sandia.gov/packages/ml/manuals.html">manuals</A>.
 */
class MLPreconditionerFactory : public PreconditionerFactoryBase<double> {
public:

  /** @name Constructors/initializers/accessors */
  //@{

  /** \brief . */
  MLPreconditionerFactory();
    
  /** \brief Set the strategy object used to extract an
   * <tt>Epetra_Operator</tt> view of an input forward operator.
   *
   * This view will then be dynamically casted to <tt>Epetra_RowMatrix</tt>
   * before it is used.
   *
   * The default implementation used is <tt>EpetraOperatorViewExtractorBase</tt>.
   */
  STANDARD_COMPOSITION_MEMBERS(
    EpetraOperatorViewExtractorBase, epetraFwdOpViewExtractor );

  //@}

  /** @name Overridden from PreconditionerFactoryBase */
  //@{

  /** \brief . */
  bool isCompatible( const LinearOpSourceBase<double> &fwdOp ) const;
  /** \brief . */
  bool applySupportsConj(EConj conj) const;
  /** \brief . */
  bool applyTransposeSupportsConj(EConj conj) const;
  /** \brief . */
  Teuchos::RCP<PreconditionerBase<double> > createPrec() const;
  /** \brief . */
  void initializePrec(
    const Teuchos::RCP<const LinearOpSourceBase<double> > &fwdOp,
    PreconditionerBase<double> *prec,
    const ESupportSolveUse supportSolveUse
    ) const;
  /** \brief . */
  void uninitializePrec(
    PreconditionerBase<double> *prec
    ,Teuchos::RCP<const LinearOpSourceBase<double> > *fwdOp
    ,ESupportSolveUse *supportSolveUse
    ) const;

  //@}

  /** @name Overridden from Teuchos::ParameterListAcceptor */
  //@{

  /** \brief . */
  void setParameterList(
    Teuchos::RCP<Teuchos::ParameterList> const& paramList);
  /** \brief . */
  Teuchos::RCP<Teuchos::ParameterList> getNonconstParameterList();
  /** \brief . */
  Teuchos::RCP<Teuchos::ParameterList> unsetParameterList();
  /** \brief . */
  Teuchos::RCP<const Teuchos::ParameterList> getParameterList() const;
  /** \brief . */
  Teuchos::RCP<const Teuchos::ParameterList> getValidParameters() const;
  //@}

  /** \name Public functions overridden from Describable. */
  //@{

  /** \brief . */
  std::string description() const;

  // ToDo: Add an override of describe(...) to give more detail!

  //@}

private:

  Teuchos::RCP<Teuchos::ParameterList> paramList_;

};


} // namespace Thyra


#endif // THYRA_ML_PRECONDITIONER_FACTORY_DECL_HPP