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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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// 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 NOX_LINESEARCH_SAFEGUARDED_STEP_H
#define NOX_LINESEARCH_SAFEGUARDED_STEP_H

#include "NOX_LineSearch_Generic.H" // base class

#include "NOX_LineSearch_Utils_Printing.H"  // class data member
#include "NOX_LineSearch_Utils_Counters.H"  // class data member
#include "Teuchos_RCP.hpp"          // class data member

// Forward Declarations
namespace NOX {
  namespace MeritFunction {
    class Generic;
  }
}

namespace NOX {
namespace LineSearch {

/*!
  \brief A line search that determines the step size by capping the magnitue of specific entries of the direction vector.  The limits are specified by a user defined vector.
*/

class SafeguardedStep : public Generic {

public:

  //! Constructor
  SafeguardedStep(const Teuchos::RCP<NOX::GlobalData>& gd,
          Teuchos::ParameterList& params);

  // derived
  bool reset(const Teuchos::RCP<NOX::GlobalData>& gd,
         Teuchos::ParameterList& params);

  // derived
  bool compute(NOX::Abstract::Group& newgrp, double& step,
           const NOX::Abstract::Vector& dir,
           const NOX::Solver::Generic& s);

  Teuchos::RCP<const Teuchos::ParameterList> getValidParameters();

private:

  void printOpeningRemarks() const;

private:

  Teuchos::RCP<NOX::Abstract::Vector> userLimits_;
  Teuchos::RCP<NOX::Abstract::Vector> invLimits_;
  Teuchos::RCP<NOX::Abstract::Vector> scaledUpdate_;
  double lowerStepBound_;
  double upperStepBound_;

  Teuchos::ParameterList* paramsPtr_;
  Teuchos::RCP<Teuchos::ParameterList> validParams_;
  bool useCounter_;
  Teuchos::RCP<NOX::GlobalData> globalDataPtr_;
  NOX::LineSearch::Utils::Printing print_;
  NOX::LineSearch::Utils::Counters counter_;

};
} // namespace LineSearch
} // namespace NOX
#endif