// Copyright (C) 2005, 2007 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Eclipse Public License.
//
// Authors:  Andreas Waechter            IBM    2005-10-13

#ifndef __IPSEARCHDIRCALCULATOR_HPP__
#define __IPSEARCHDIRCALCULATOR_HPP__

#include "IpAlgStrategy.hpp"

namespace Ipopt
{

/** Base class for computing the search direction for the line
 *  search.
 */
class IPOPTLIB_EXPORT SearchDirectionCalculator: public AlgorithmStrategyObject
{
public:
   /**@name Constructors/Destructors */
   //@{
   /** Constructor */
   SearchDirectionCalculator()
   { }

   /** Destructor */
   virtual ~SearchDirectionCalculator()
   { }
   //@}

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

   /** Pure virtual method for computing the search direction.
    *
    *  The computed direction is stored in IpData().delta().
    */
   virtual bool ComputeSearchDirection() = 0;

private:
   /**@name Default Compiler Generated Methods
    * (Hidden to avoid implicit creation/calling).
    *
    * These methods are not implemented and
    * we do not want the compiler to implement
    * them for us, so we declare them private
    * and do not define them. This ensures that
    * they will not be implicitly created/called.
    */
   //@{
   /** Default Constructor */
   //    SearchDirectionCalculator();

   /** Copy Constructor */
   SearchDirectionCalculator(
      const SearchDirectionCalculator&
   );

   /** Default Assignment Operator */
   void operator=(
      const SearchDirectionCalculator&
   );
   //@}

};

} // namespace Ipopt

#endif
