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/*
// @HEADER
// ***********************************************************************
// 
//    OptiPack: Collection of simple Thyra-based Optimization ANAs
//                 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
// 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 Roscoe A. Bartlett (rabartl@sandia.gov) 
// 
// ***********************************************************************
// @HEADER
*/

#ifndef OPTIPACK_UNCONSTRAINED_OPT_MERIT_FUNC_1D_DECL_HPP
#define OPTIPACK_UNCONSTRAINED_OPT_MERIT_FUNC_1D_DECL_HPP


#include "OptiPack_Types.hpp"
#include "GlobiPack_MeritFunc1DBase.hpp"
#include "OptiPack_LineSearchPointEvaluatorBase.hpp"
#include "Thyra_OperatorVectorTypes.hpp"


namespace OptiPack {


/** \brief Concreate subclass for unconstrained optimization objective
 * function.
 *
 * This subclass turns a response-only ModelEvaluator for an unconstrained
 * optimization problem <tt>g(p)</tt> into a 1D merit function.
 *
 * ToDo: Finish Documentation!
 */
template<typename Scalar>
class UnconstrainedOptMeritFunc1D
  : public GlobiPack::MeritFunc1DBase<typename ScalarTraits<Scalar>::magnitudeType>
{
public:

  /** \brief . */
  typedef typename ScalarTraits<Scalar>::magnitudeType ScalarMag;

  /** \name Constructor/Initializers/Accessors */
  //@{

  /** \brief Construct with default parameters. */
  UnconstrainedOptMeritFunc1D();

  /** \brief Set the model. */
  void setModel(
    const RCP<const Thyra::ModelEvaluator<Scalar> > &model,
    const int paramIndex,
    const int responseIndex
    );

  /** \brief Set the evaluation qualities.
   *
   * \param pointEvaluator [persisting non-modified] Evaluates p = p(alpha).
   *
   * \param p [persisting modified] Point that is updated with every call to
   * <tt>eval(...)</tt>.
   *
   * \param g_vec [persisting modified] The 1D vector used to store the
   * objective value computed by <tt>model</tt>.
   *
   * \param g_grad_vec [persisting modified] If <tt>!is_null(g_grad_vec)</tt>,
   * then this will be updated when <tt>eval(...)</tt> is called.
   *
   * \param baseDeriv [in] If <tt>!is_null(baseDeriv)</tt>, then gives the
   * value to be returned in <tt>this->baseDeriv()</tt>.
   *
   * <b>Postconditions:</b><ul>
   *
   * <li> [<tt>!is_null(g_grad_vec)</tt>]
   * <tt>this->supportsDerivEvals()==true</tt>
   *
   * <li> [<tt>!is_null(baseDeriv)</tt>]
   * <tt>this->supportsBaseDeriv()==true</tt>
   *
   * </ul>
   */
  void setEvaluationQuantities(
    const RCP<const LineSearchPointEvaluatorBase<Scalar> > &pointEvaluator,
    const RCP<Thyra::VectorBase<Scalar> > &p,
    const RCP<Thyra::VectorBase<Scalar> > &g_vec,
    const RCP<Thyra::VectorBase<Scalar> > &g_grad_vec
    );

  //@}

  /** \name Overridden from MeritFunc1DBase. */
  //@{
  
  /** \brief . */
  virtual bool supportsDerivEvals() const;
  /** \brief . */
  virtual void eval( const ScalarMag &alpha, const Ptr<ScalarMag> &phi,
    const Ptr<ScalarMag> &Dphi ) const;

  //@}

private:

  // //////////////////////
  // Private data members

  RCP<const Thyra::ModelEvaluator<Scalar> > model_;
  int paramIndex_;
  int responseIndex_;

  RCP<const LineSearchPointEvaluatorBase<Scalar> > pointEvaluator_;
  RCP<Thyra::VectorBase<Scalar> > p_;
  RCP<Thyra::VectorBase<Scalar> > g_vec_;
  RCP<Thyra::VectorBase<Scalar> > g_grad_vec_;

};


/** \brief Nonmember constructor.
 *
 * \relates UnconstrainedOptMeritFunc1D
 */
template<typename Scalar>
const RCP<UnconstrainedOptMeritFunc1D<Scalar> >
unconstrainedOptMeritFunc1D(
  const RCP<const Thyra::ModelEvaluator<Scalar> > &model,
  const int paramIndex,
  const int responseIndex
  )
{
  const RCP<UnconstrainedOptMeritFunc1D<Scalar> > meritFunc = 
    Teuchos::rcp(new UnconstrainedOptMeritFunc1D<Scalar>);
  meritFunc->setModel(model, paramIndex, responseIndex);
  return meritFunc;
}


} // namespace OptiPack


#endif // OPTIPACK_UNCONSTRAINED_OPT_MERIT_FUNC_1D_DECL_HPP