/home/coin/SVN-release/CoinAll-1.1.0/Ipopt/src/Algorithm/IpBacktrackingLSAcceptor.hpp

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// Copyright (C) 2004, 2007 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Common Public License.
//
// $Id: IpBacktrackingLSAcceptor.hpp 1065 2007-08-06 21:19:49Z andreasw $
//
// Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13
//           Andreas Waechter                 IBM    2005-10-13
//               derived file from IpFilterLineSearch.hpp

#ifndef __IPBACKTRACKINGLSACCEPTOR_HPP__
#define __IPBACKTRACKINGLSACCEPTOR_HPP__

#include "IpAlgStrategy.hpp"

namespace Ipopt
{

  class BacktrackingLSAcceptor : public AlgorithmStrategyObject
  {
  public:
    BacktrackingLSAcceptor()
    {}

    virtual ~BacktrackingLSAcceptor()
    {}

    virtual bool InitializeImpl(const OptionsList& options,
                                const std::string& prefix)=0;

    virtual void Reset()=0;

    virtual void InitThisLineSearch(bool in_watchdog)=0;

    virtual void PrepareRestoPhaseStart()=0;

    virtual Number CalculateAlphaMin()=0;

    virtual bool CheckAcceptabilityOfTrialPoint(Number alpha_primal)=0;

    virtual bool TrySecondOrderCorrection(Number alpha_primal_test,
                                          Number& alpha_primal,
                                          SmartPtr<IteratesVector>& actual_delta)=0;

    virtual bool TryCorrector(Number alpha_primal_test,
                              Number& alpha_primal,
                              SmartPtr<IteratesVector>& actual_delta)=0;

    virtual char UpdateForNextIteration(Number alpha_primal_test)=0;

    virtual void StartWatchDog()=0;

    virtual void StopWatchDog()=0;

    virtual bool RestoredIterate()
    {
      return false;
    }

    virtual bool NeverRestorationPhase()
    {
      return false;
    }

    virtual bool DoFallback()
    {
      return false;
    }

    virtual Number ComputeAlphaForY(Number alpha_primal,
                                    Number alpha_dual,
                                    SmartPtr<IteratesVector>& delta)
    {
      THROW_EXCEPTION(OPTION_INVALID,
                      "Value \"acceptor\" for option \"alpha_for_y\" not valid for this line search.");
      return -1.;
    }

    static void RegisterOptions(SmartPtr<RegisteredOptions> roptions);

  private:
    BacktrackingLSAcceptor(const BacktrackingLSAcceptor&);

    void operator=(const BacktrackingLSAcceptor&);
  };

} // namespace Ipopt

#endif

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