itkChangeLabelImageFilter.h

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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 itkChangeLabelImageFilter_h
#define itkChangeLabelImageFilter_h

#include "itkUnaryFunctorImageFilter.h"
#include "itkConceptChecking.h"
#include "itkSimpleDataObjectDecorator.h"

#include <map>

namespace itk
{
namespace Functor
{
template< typename TInput, typename TOutput >
class ITK_TEMPLATE_EXPORT ChangeLabel
{
public:
  ChangeLabel() = default;
  ~ChangeLabel() = default;

  using ChangeMapType = std::map< TInput, TOutput >;

  bool operator!=(const ChangeLabel & other) const
  {
    if ( m_ChangeMap != other.m_ChangeMap )
      {
      return true;
      }
    return false;
  }

  bool operator==(const ChangeLabel & other) const
  {
    return !( *this != other );
  }

  TOutput GetChange(const TInput & original)
  {
    return m_ChangeMap[original];
  }

  void SetChange(const TInput & original, const TOutput & result)
  {
    m_ChangeMap[original] = result;
  }

  void SetChangeMap(const ChangeMapType & changeMap)
  {
    m_ChangeMap = changeMap;
  }

  void ClearChangeMap()
  {
    m_ChangeMap.clear();
  }

  inline TOutput operator()(const TInput & A) const
  {
    const typename ChangeMapType::const_iterator it = m_ChangeMap.find(A);
    if ( it != m_ChangeMap.end() )
      {
      return it->second;
      }
    return A;
  }

private:
  ChangeMapType m_ChangeMap;
};
}

template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_EXPORT ChangeLabelImageFilter:
  public
  UnaryFunctorImageFilter< TInputImage, TOutputImage,
                           Functor::ChangeLabel<
                             typename TInputImage::PixelType,
                             typename TOutputImage::PixelType > >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(ChangeLabelImageFilter);

  using Self = ChangeLabelImageFilter;
  using Superclass = UnaryFunctorImageFilter< TInputImage, TOutputImage,
                                   Functor::ChangeLabel<
                                     typename TInputImage::PixelType,
                                     typename TOutputImage::PixelType >
                                   >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(ChangeLabelImageFilter, UnaryFunctorImageFilter);

  using InputPixelType = typename TInputImage::PixelType;
  using OutputPixelType = typename TOutputImage::PixelType;

  using ChangeMapType = std::map< InputPixelType, OutputPixelType >;

  void SetChange(const InputPixelType & original, const OutputPixelType & result);

  void SetChangeMap(const ChangeMapType & changeMap);

  void ClearChangeMap();

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputConvertibleToOutputCheck,
                   ( Concept::Convertible< InputPixelType, OutputPixelType > ) );
  itkConceptMacro( PixelTypeComparable,
                   ( Concept::Comparable< InputPixelType > ) );
  // End concept checking
#endif

protected:
  ChangeLabelImageFilter() = default;
  ~ChangeLabelImageFilter() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override;
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkChangeLabelImageFilter.hxx"
#endif

#endif