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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 itkWatershedEquivalenceRelabeler_h
#define itkWatershedEquivalenceRelabeler_h

#include "itkWatershedSegmenter.h"

namespace itk
{
namespace watershed
{
/** \class EquivalenceRelabeler
 *
 * This class is part of the set of watershed segmentation component objects.
 * It is an image-to-image filter that relabels its input according to a set of
 * equivalencies defined in a table.  The filter is used in
 * itk::WatershedImageFilter, for example, to relabel a segmented image
 * at different hierarchies in the merge tree (see itk::WatershedImageFilter
 * for documentation on terminology).  It simply takes its input and changes
 * any values found in the equivalency table.
 *
 * \par Inputs
 * There are two inputs to this filter, an IdentifierType itk::Image of
 * arbitrary dimension, and an itk::EquivalencyTable.  The input
 * image is the image to be relabeled and copied to the output, and the
 * EquivalencyTable identifies  how to relabel the values.
 *
 * \par Output
 * The output of this filter is the relabeled IdentifierType itk::Image of same
 * dimension and size as the input.
 *
 * \ingroup WatershedSegmentation
 * \sa itk::WatershedImageFilter
 * \sa EquivalencyTable
 * \ingroup ITKWatersheds
 */
template< typename TScalar, unsigned int TImageDimension >
class EquivalenceRelabeler:
  public ProcessObject
{
public:
  /** Expose templated image dimension parameter at run time */
  itkStaticConstMacro(ImageDimension, unsigned int, TImageDimension);

  /**  Some convenient typedefs.   */
  typedef Image< IdentifierType, TImageDimension >          ImageType;
  typedef EquivalenceRelabeler                              Self;
  typedef ProcessObject                                     Superclass;
  typedef TScalar                                           ScalarType;
  typedef EquivalencyTable                                  EquivalencyTableType;
  typedef Segmenter< Image< ScalarType, TImageDimension > > SegmenterType;
  typedef DataObject::Pointer                               DataObjectPointer;

  /**  Define smart pointers for this object.   */
  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;
  itkNewMacro(Self);
  itkTypeMacro(WatershedEquivalenceRelabeler, ProcessObject);

  /** Set/Get the image to relabel.   */
  void SetInputImage(ImageType *img)
  { this->ProcessObject::SetNthInput(0, img); }
  const ImageType * GetInputImage(void)
  {
    return static_cast< ImageType * >
           ( this->ProcessObject::GetInput(0) );
  }

  /** Set/Get the output image */
  void SetOutputImage(ImageType *img)
  {
    this->ProcessObject::SetNthOutput(0, img);
  }

  typename ImageType::Pointer GetOutputImage()
  {
    return static_cast< ImageType * >
           ( this->ProcessObject::GetOutput(0) );
  }

  /** Set/Get the table to use in relabeling the input image.   */
  void SetEquivalencyTable(EquivalencyTableType *et)
  {
    this->ProcessObject::SetNthInput(1, et);
  }

  EquivalencyTableType::Pointer GetEquivalencyTable()
  {
    return static_cast< EquivalencyTableType * >
           ( this->ProcessObject::GetInput(1) );
  }

  /** Standard non-threaded pipeline method */
  virtual void GenerateData() ITK_OVERRIDE;

  /** Standard itk::ProcessObject subclass method. */
  typedef ProcessObject::DataObjectPointerArraySizeType DataObjectPointerArraySizeType;
  using Superclass::MakeOutput;
  virtual DataObjectPointer MakeOutput(DataObjectPointerArraySizeType idx) ITK_OVERRIDE;

protected:
  EquivalenceRelabeler()
  {
    typename ImageType::Pointer img =
      static_cast< ImageType * >( this->MakeOutput(0).GetPointer() );
    this->SetNumberOfRequiredOutputs(1);
    this->ProcessObject::SetNthOutput( 0, img.GetPointer() );
  }

  virtual ~EquivalenceRelabeler() {}
  EquivalenceRelabeler(const Self &) {}
  void operator=(const Self &) {}
  virtual void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;

  virtual void GenerateOutputRequestedRegion(DataObject *output) ITK_OVERRIDE;

  virtual void GenerateInputRequestedRegion() ITK_OVERRIDE;
};
} // end namespace watershed
} // end namespace itk

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

#endif