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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef __itkSingleValuedNonLinearOptimizer_h
#define __itkSingleValuedNonLinearOptimizer_h

#include "itkNonLinearOptimizer.h"
#include "itkSingleValuedCostFunction.h"

namespace itk
{
/** \class SingleValuedNonLinearOptimizer
 * \brief This class is a base for the Optimization methods that
 * optimize a single valued function.
 *
 * \ingroup Numerics Optimizers
 *
 * \ingroup ITKOptimizers
 */
class SingleValuedNonLinearOptimizer:
  public NonLinearOptimizer
{
public:
  /** Standard "Self" typedef. */
  typedef SingleValuedNonLinearOptimizer Self;
  typedef NonLinearOptimizer             Superclass;
  typedef SmartPointer< Self >           Pointer;
  typedef SmartPointer< const Self >     ConstPointer;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Run-time type information (and related methods). */
  itkTypeMacro(SingleValuedNonLinearOptimizer,
               NonLinearOptimizer);

  /**  Parameters type.
   *  It defines a position in the optimization search space. */
  typedef Superclass::ParametersType ParametersType;

  /** Type of the Cost Function   */
  typedef  SingleValuedCostFunction  CostFunctionType;
  typedef  CostFunctionType::Pointer CostFunctionPointer;

  /**  Measure type.
   *  It defines a type used to return the cost function value.  */
  typedef CostFunctionType::MeasureType MeasureType;

  /**  Derivative type.
   *  It defines a type used to return the cost function derivative. */
  typedef CostFunctionType::DerivativeType DerivativeType;

  /** Set the cost function. */
  virtual void SetCostFunction(CostFunctionType *costFunction);

  /** Get the cost function. */
  itkGetModifiableObjectMacro(CostFunction, CostFunctionType);

  /** Get the cost function value at the given parameters. */
  MeasureType GetValue(const ParametersType & parameters) const;

protected:
  SingleValuedNonLinearOptimizer();
  virtual ~SingleValuedNonLinearOptimizer() {}
  void PrintSelf(std::ostream & os, Indent indent) const;

  CostFunctionPointer m_CostFunction;

private:
  SingleValuedNonLinearOptimizer(const Self &); //purposely not implemented
  void operator=(const Self &);                 //purposely not implemented
};
} // end namespace itk

#endif