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// Copyright (C) 2004, 2006 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Common Public License.
//
// $Id: IpMonotoneMuUpdate.hpp 735 2006-06-04 06:10:05Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13

#ifndef __IPMONOTONEMUUPDATE_HPP__
#define __IPMONOTONEMUUPDATE_HPP__

#include "IpMuUpdate.hpp"
#include "IpLineSearch.hpp"
#include "IpRegOptions.hpp"

namespace Ipopt
{

  class MonotoneMuUpdate : public MuUpdate
  {
  public:
    MonotoneMuUpdate(const SmartPtr<LineSearch>& linesearch);

    virtual ~MonotoneMuUpdate();

    virtual bool InitializeImpl(const OptionsList& options,
                                const std::string& prefix);

    virtual bool UpdateBarrierParameter();

    static void RegisterOptions(const SmartPtr<RegisteredOptions>& roptions);

  private:
    MonotoneMuUpdate();

    MonotoneMuUpdate(const MonotoneMuUpdate&);

    void operator=(const MonotoneMuUpdate&);

    void CalcNewMuAndTau(Number &new_mu,
                         Number &new_tau);

    Number mu_init_;
    Number barrier_tol_factor_;
    Number mu_linear_decrease_factor_;
    Number mu_superlinear_decrease_power_;
    bool mu_allow_fast_monotone_decrease_;
    Number tau_min_;
    Number compl_inf_tol_;

    SmartPtr<LineSearch> linesearch_;

    bool initialized_;

    bool first_iter_resto_;
  };

} // namespace Ipopt

#endif

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