Numerics/Statistics/itkSample.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSample.h,v $
  Language:  C++
  Date:      $Date: 2009-03-04 19:29:53 $
  Version:   $Revision: 1.27 $

  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 __itkSample_h
#define __itkSample_h

#include <vector>

#include "itkMacro.h"
#include "itkPoint.h"
#include "itkSize.h"
#include "itkObject.h"
#include "itkFixedArray.h"
#include "itkMeasurementVectorTraits.h"
#include "itkNumericTraits.h"

namespace itk { 
namespace Statistics {

template < class TMeasurementVector >
class ITK_EXPORT Sample : public Object
{
public:
  typedef Sample                   Self;  
  typedef Object                   Superclass;
  typedef SmartPointer< Self >     Pointer;
  typedef SmartPointer<const Self> ConstPointer;

  itkTypeMacro(Sample, Object);

  typedef TMeasurementVector MeasurementVectorType;

  typedef typename MeasurementVectorType::ValueType   MeasurementType;

  typedef float FrequencyType;

  typedef NumericTraits<FrequencyType>::AccumulateType TotalFrequencyType;

  typedef unsigned long InstanceIdentifier;

  typedef unsigned int  MeasurementVectorSizeType;

  virtual unsigned int Size() const = 0;

  virtual const MeasurementVectorType & 
    GetMeasurementVector(const InstanceIdentifier &id) const = 0;

  virtual FrequencyType GetFrequency(const InstanceIdentifier &id) const = 0;

  virtual TotalFrequencyType GetTotalFrequency() const 
    = 0;

  
  virtual void SetMeasurementVectorSize( const MeasurementVectorSizeType s )
    {
    MeasurementVectorType m;
    MeasurementVectorSizeType defaultLength = MeasurementVectorTraits::GetLength( m );
    if( (defaultLength != 0) && (s!=defaultLength) )
      {
      return; // Do not do anything.
      //itkExceptionMacro( << "Cannot instantiate a sample with a fixed length "
      // << "container and resize it later. Create it with itk::Array if you like.");
      }
    this->m_MeasurementVectorSize = s;
    }
  itkGetConstMacro( MeasurementVectorSize, MeasurementVectorSizeType );

  
protected:
  Sample()
    {
    m_MeasurementVectorSize = MeasurementVectorTraits::GetLength( 
                                        MeasurementVectorType() );
    }

  virtual ~Sample() {}
  void PrintSelf(std::ostream& os, Indent indent) const
    {
    Superclass::PrintSelf(os,indent);
    os << indent << "Length of measurement vectors in the sample: " << 
      m_MeasurementVectorSize << std::endl;
    }


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

  MeasurementVectorSizeType m_MeasurementVectorSize;
}; // end of class

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

#endif

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