itkImageToListAdaptor.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageToListAdaptor.h,v $
  Language:  C++
  Date:      $Date: 2009-03-04 15:23:50 $
  Version:   $Revision: 1.39 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkImageToListAdaptor_h
#define __itkImageToListAdaptor_h

#include <typeinfo>

#include "itkImage.h"
#include "itkPixelTraits.h"
#include "itkListSampleBase.h"
#include "itkSmartPointer.h"
#include "itkImageRegionIterator.h"
#include "itkFixedArray.h"
#include "itkMacro.h"

namespace itk { 
namespace Statistics {

template < class TImage,
           class TMeasurementVector = 
           ITK_TYPENAME TImage::PixelType >
class ITK_EXPORT ImageToListAdaptor : 
    public ListSampleBase< TMeasurementVector >
{
public:
  typedef ImageToListAdaptor                   Self;
  typedef ListSampleBase< TMeasurementVector > Superclass;
  typedef SmartPointer< Self >                 Pointer;
  typedef SmartPointer<const Self>             ConstPointer;

  itkTypeMacro(ImageToListAdaptor, ListSampleBase);

  itkNewMacro(Self);

  typedef TImage                                         ImageType;
  typedef typename ImageType::Pointer                    ImagePointer;
  typedef typename ImageType::ConstPointer               ImageConstPointer;
  typedef typename ImageType::IndexType                  IndexType;
  typedef typename ImageType::PixelType                  PixelType;
  typedef typename ImageType::PixelContainerConstPointer PixelContainerConstPointer;
  typedef typename ImageType::PixelContainer::ElementIdentifier 
                                                         InstanceIdentifier;

  typedef ImageRegionIterator< ImageType > IteratorType; 
  typedef PixelTraits< typename TImage::PixelType > PixelTraitsType;

  typedef typename PixelTraitsType::ValueType            MeasurementType;
  typedef typename Superclass::FrequencyType             FrequencyType;
  typedef typename Superclass::TotalFrequencyType        TotalFrequencyType;
  typedef typename Superclass::MeasurementVectorSizeType MeasurementVectorSizeType;

  itkStaticConstMacro(MeasurementVectorSize, unsigned int,
                      PixelTraitsType::Dimension);

  virtual void SetMeasurementVectorSize( const MeasurementVectorSizeType s )
    {
    // Measurement vector size for this class is fixed as the pixel's 
    // dimension. This method should throw an exception if the user tries to 
    // set the dimension to a different value. 
    if( s != MeasurementVectorSize )
      {
      itkExceptionMacro( << "Measurement vector size for the image adaptor obtained"
          << " from the pixel dimension is: " << MeasurementVectorSize << " but you "
          << "are setting it to " << s);
      }
    }

 unsigned int GetMeasurementVectorSize() const 
   {
   return MeasurementVectorSize;
   } 
    
  

  typedef TMeasurementVector    MeasurementVectorType;
  typedef MeasurementVectorType ValueType;

  void SetImage(const TImage* image);

  const TImage* GetImage() const;

  unsigned int Size() const;

  inline virtual const MeasurementVectorType & GetMeasurementVector(const InstanceIdentifier &id) const;

  inline FrequencyType GetFrequency(const InstanceIdentifier &id) const;

  TotalFrequencyType GetTotalFrequency() const;
  
 
  class Iterator
  {
  public:
    
    Iterator(){}
    
    Iterator(InstanceIdentifier id, Pointer pContainer)
      :m_Id(id),m_Container(pContainer) {}
    
    FrequencyType GetFrequency() const
      { return 1;}

    const MeasurementVectorType & GetMeasurementVector() const
      { return m_Container->GetMeasurementVector(m_Id);} 

    InstanceIdentifier GetInstanceIdentifier() const
      { return m_Id;}

    Iterator& operator++()
      { ++m_Id; return *this;}
    
    Iterator& operator+(int n)
      { m_Id += n; return *this;}
    
    Iterator& operator-(int n)
      { m_Id -= n; return *this;}

    bool operator!=(const Iterator &it)
      {
      if (m_Id != it.m_Id)
        {return true;}

      if (m_Container != it.m_Container)
        { return true;}

      return false;
      } 
    
    bool operator==(const Iterator &it)
      { return !(*this != it);}
    
    Iterator& operator = (const Iterator &iter)
      { 
      m_Id = iter.m_Id; 
      m_Container = iter.m_Container; 
      return *this;
      }

    Iterator(const Iterator &iter)
      {   
      m_Id = iter.m_Id; 
      m_Container = iter.m_Container; 
      }
    
  private:
    InstanceIdentifier m_Id;  // Current id 
    Pointer m_Container;
  };


  class ConstIterator
    {
    public:
    
    ConstIterator(){}
    
    ConstIterator(InstanceIdentifier id, ConstPointer pContainer)
      :m_Id(id),m_Container(pContainer) {}
    
    FrequencyType GetFrequency() const
      { return 1;}

    const MeasurementVectorType & GetMeasurementVector() const
      { return m_Container->GetMeasurementVector(m_Id);} 

    InstanceIdentifier GetInstanceIdentifier() const
      { return m_Id;}

    ConstIterator& operator++()
      { ++m_Id; return *this;}
    
    ConstIterator& operator+(int n)
      { m_Id += n; return *this;}
    
    ConstIterator& operator-(int n)
      { m_Id -= n; return *this;}

    bool operator!=(const ConstIterator &it)
      {
      if (m_Id != it.m_Id)
        {return true;}

      if (m_Container != it.m_Container)
        { return true;}

      return false;
      }
    
    bool operator==(const ConstIterator &it)
      { return !(*this != it);}
    
    ConstIterator& operator = (const ConstIterator &iter)
      {
      m_Id = iter.m_Id; 
      m_Container = iter.m_Container; 
      return *this;
      }

    ConstIterator(const ConstIterator &iter)
      { 
      m_Id = iter.m_Id; 
      m_Container = iter.m_Container; 
      }
    
  private:
    InstanceIdentifier m_Id;  // Current id 
    ConstPointer m_Container;
  };

  Iterator Begin()
    { 
    Iterator iter(0, this);
    return iter; 
    }
  
  Iterator End()
    {
    Iterator iter(this->Size(), this); 
    return iter; 
    }

  ConstIterator Begin() const
    { 
    ConstIterator iter(0, this);
    return iter; 
    }
  
  ConstIterator End() const
    {
    ConstIterator iter(this->Size(), this); 
    return iter; 
    }
 
protected:
  ImageToListAdaptor();
  virtual ~ImageToListAdaptor() {}
  void PrintSelf(std::ostream& os, Indent indent) const;  

  itkGetConstReferenceMacro(PixelContainer,PixelContainerConstPointer);
  itkGetConstReferenceMacro(UseBuffer,bool);
  itkGetConstReferenceMacro(ImageBeginIndex,IndexType);
  itkGetConstReferenceMacro(ImageEndIndex,IndexType);


private:
  ImageToListAdaptor(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  PixelContainerConstPointer m_PixelContainer;
  bool                       m_UseBuffer;
  IndexType                  m_ImageBeginIndex;
  IndexType                  m_ImageEndIndex;

  ImageConstPointer m_Image;
}; // end of class ImageToListAdaptor

template < class TImage, class TMeasurementVector >
inline const TMeasurementVector &
ImageToListAdaptor< TImage, TMeasurementVector >
::GetMeasurementVector(const InstanceIdentifier &id) const
{
  if ( m_UseBuffer )
    {
    return *( reinterpret_cast< const MeasurementVectorType* >(&(*m_PixelContainer)[id]) );
    }
  else
    {
    return *(reinterpret_cast< const MeasurementVectorType* >
             ( &(m_Image->GetPixel( m_Image->ComputeIndex( id ) ) ) ) );
    }
}

template < class TImage, class TMeasurementVector >
inline unsigned int
ImageToListAdaptor< TImage, TMeasurementVector >
::Size() const
{
  return m_PixelContainer->Size();
}

template < class TImage, class TMeasurementVector >
inline typename ImageToListAdaptor< TImage, TMeasurementVector >::FrequencyType
ImageToListAdaptor< TImage, TMeasurementVector >
::GetFrequency(const InstanceIdentifier &) const 
{
  return NumericTraits< FrequencyType >::One;
}

} // end of namespace Statistics
} // end of namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkImageToListAdaptor.txx"
#endif

#endif

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