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// $Id$
// $Source$

//@HEADER
// ************************************************************************
//
//            LOCA: Library of Continuation Algorithms Package
//                 Copyright (2005) 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
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// 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 LOCA_TIMEDEPENDENT_ABSTRACTGROUP_H
#define LOCA_TIMEDEPENDENT_ABSTRACTGROUP_H

#include "LOCA_MultiContinuation_AbstractGroup.H"    // base class

namespace LOCA {

  namespace TimeDependent {

    /*!
     * \brief Interface to underlying groups for time dependent systems
     */
    /*!
     * This abstract class provides an interface for time dependent problems,
     * i.e., problems with a mass matrix (typically used in eignvalue or
     * Hopf calculations).  It provides pure virtual methods for computing
     * and manipulating the shifted matrix \f$\alpha J + \beta M\f$ where
     * \f$J\f$ is the Jacobian matrix and \f$M\f$ is the mass matrix.
     */
    class AbstractGroup :
      public virtual LOCA::MultiContinuation::AbstractGroup {

    public:

      //! Default constructor.
      AbstractGroup() {}

      //! Destructor
      virtual ~AbstractGroup() {}

      /*!
       * @name Pure virtual methods
       * These methods must be defined by any concrete implementation
       */
      //@{

      //! Compute the shifted matrix
      virtual NOX::Abstract::Group::ReturnType
      computeShiftedMatrix(double alpha, double beta) = 0;

      //! Multiply the shifted matrix by a vector.
      virtual NOX::Abstract::Group::ReturnType
      applyShiftedMatrix(const NOX::Abstract::Vector& input,
             NOX::Abstract::Vector& result) const = 0;

      //! Multiply the shifted matrix by a multi-vector.
      virtual NOX::Abstract::Group::ReturnType
      applyShiftedMatrixMultiVector(
                const NOX::Abstract::MultiVector& input,
                NOX::Abstract::MultiVector& result) const = 0;

      /*!
       * \brief Apply the inverse of the shifted matrix by a multi-vector, as
       * needed by the shift-and-invert and generalized Cayley transformations.
       */
      virtual NOX::Abstract::Group::ReturnType
      applyShiftedMatrixInverseMultiVector(
                    Teuchos::ParameterList& params,
                const NOX::Abstract::MultiVector& input,
                NOX::Abstract::MultiVector& result) const = 0;


      //@}

      //! Compute the second shifted matrix. Can avoid recomputing if two are stored.
      /*!
       * Implementation here prints an error message and returns
       * NOX::Abstract::Group::NotDefined.
       */
      virtual NOX::Abstract::Group::ReturnType
      computeSecondShiftedMatrix(double alpha, double beta) = 0;

      //! Multiply the shifted matrix by a vector.
      /*!
       * Implementation here prints an error message and returns
       * NOX::Abstract::Group::NotDefined.
       */
      virtual NOX::Abstract::Group::ReturnType
      applySecondShiftedMatrix(const NOX::Abstract::Vector& input,
                         NOX::Abstract::Vector& result) const = 0;

      //! Multiply the shifted matrix by a multi-vector.
      /*!
       * Implementation here prints an error message and returns
       * NOX::Abstract::Group::NotDefined.
       */
      virtual NOX::Abstract::Group::ReturnType
      applySecondShiftedMatrixMultiVector(
                                const NOX::Abstract::MultiVector& input,
                                NOX::Abstract::MultiVector& result) const = 0;

      //@}


      //! Bring NOX::Abstract::Group::operator=() into scope
      using NOX::Abstract::Group::operator=;

    };
  } // namespace TimeDependent
} // namespace LOCA

#endif