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// $Id$
// $Source$

//@HEADER
// ************************************************************************
//
//            NOX: An Object-Oriented Nonlinear Solver Package
//                 Copyright (2002) 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
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Roger Pawlowski (rppawlo@sandia.gov) or
// Eric Phipps (etphipp@sandia.gov), Sandia National Laboratories.
// ************************************************************************
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//@HEADER

#ifndef NOX_LAPACK_INTERFACE_H
#define NOX_LAPACK_INTERFACE_H

// Forward declarations
namespace NOX {
  namespace LAPACK {
    class Vector;
    template <typename T> class Matrix;
  }
}

namespace NOX {
  namespace LAPACK {

    /*! \brief Virtual interface for NOX::BLAS::Group to provide a
      link to the external code for RHS and Jacobian fills. */
    class Interface {

    public:

      //! Constructor
      Interface() {};

      //! Destructor
      virtual ~Interface() {};

      //! Get initial guess
      virtual const NOX::LAPACK::Vector& getInitialGuess() = 0;

      //! Compute RHS given the specified input vector x.  Returns true if computation was successful.
      virtual bool computeF(NOX::LAPACK::Vector& rhs, const NOX::LAPACK::Vector &x) = 0;

      //! Compute Jacobian given the specified input vector x.  Returns true if computation was successful.
      virtual bool computeJacobian(NOX::LAPACK::Matrix<double>& J, const NOX::LAPACK::Vector & x) = 0;

    };
  } // namespace LAPACK
} // namespace NOX

#endif