itkAttributeKeepNObjectsLabelMapFilter.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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 itkAttributeKeepNObjectsLabelMapFilter_h
#define itkAttributeKeepNObjectsLabelMapFilter_h
 
#include "itkInPlaceLabelMapFilter.h"
#include "itkAttributeLabelObject.h"
 
namespace itk
{
template <typename TImage,
          typename TAttributeAccessor =
            typename Functor::AttributeLabelObjectAccessor<typename TImage::LabelObjectType>>
class ITK_TEMPLATE_EXPORT AttributeKeepNObjectsLabelMapFilter : public InPlaceLabelMapFilter<TImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(AttributeKeepNObjectsLabelMapFilter);

  using Self = AttributeKeepNObjectsLabelMapFilter;
  using Superclass = InPlaceLabelMapFilter<TImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  using ImageType = TImage;
  using ImagePointer = typename ImageType::Pointer;
  using ImageConstPointer = typename ImageType::ConstPointer;
  using PixelType = typename ImageType::PixelType;
  using IndexType = typename ImageType::IndexType;
  using LabelObjectType = typename ImageType::LabelObjectType;
 
  using AttributeAccessorType = TAttributeAccessor;
  using AttributeValueType = typename AttributeAccessorType::AttributeValueType;

  static constexpr unsigned int ImageDimension = TImage::ImageDimension;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(AttributeKeepNObjectsLabelMapFilter);
 
  /*itkConceptMacro(InputEqualityComparableCheck,
      (Concept::EqualityComparable<InputImagePixelType>));
    itkConceptMacro(IntConvertibleToInputCheck,
      (Concept::Convertible<int, InputImagePixelType>));
    itkConceptMacro(InputOStreamWritableCheck,
      (Concept::OStreamWritable<InputImagePixelType>));*/

  itkSetMacro(ReverseOrdering, bool);
  itkGetConstReferenceMacro(ReverseOrdering, bool);
  itkBooleanMacro(ReverseOrdering);

  itkSetMacro(NumberOfObjects, SizeValueType);
  itkGetConstReferenceMacro(NumberOfObjects, SizeValueType);
 
protected:
  AttributeKeepNObjectsLabelMapFilter();
  ~AttributeKeepNObjectsLabelMapFilter() override = default;
 
  void
  GenerateData() override;
 
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  class ReverseComparator
  {
  public:
    bool
    operator()(const typename LabelObjectType::Pointer & a, const typename LabelObjectType::Pointer & b)
    {
      return m_Accessor(a) < m_Accessor(b);
    }
    ReverseComparator()
      : m_Accessor()
    {}
 
  private:
    AttributeAccessorType m_Accessor;
  };
 
  class Comparator
  {
  public:
    bool
    operator()(const typename LabelObjectType::Pointer & a, const typename LabelObjectType::Pointer & b)
    {
      return m_Accessor(a) > m_Accessor(b);
    }
    Comparator()
      : m_Accessor()
    {}
 
  private:
    AttributeAccessorType m_Accessor;
  };
 
private:
  bool          m_ReverseOrdering{};
  SizeValueType m_NumberOfObjects{};
 
}; // end of class
 
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkAttributeKeepNObjectsLabelMapFilter.hxx"
#endif
 
#endif