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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    itkSparseFrequencyContainer2.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  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 __itkSparseFrequencyContainer2_h
#define __itkSparseFrequencyContainer2_h

#include <map>
#include "itkObjectFactory.h"
#include "itkObject.h"
#include "itkNumericTraits.h"
#include "itkMeasurementVectorTraits.h"

namespace itk { 
namespace Statistics {

/** \class SparseFrequencyContainer2 
 *  \brief his class is a container for an histogram.
 *
 *  This class uses an map to store histogram. If your histogram is dense
 *  use DenseHistogram.  You should access each bin by 
 * (InstanceIdentifier)index or measurement vector.
 */
    
class ITK_EXPORT SparseFrequencyContainer2 : public Object
{
public:
  /** Standard class typedefs. */
  typedef SparseFrequencyContainer2                   Self;
  typedef Object                                      Superclass;
  typedef SmartPointer<Self>                          Pointer;
  typedef SmartPointer<const Self>                    ConstPointer;

  /** Standard macros */
  itkTypeMacro(SparseFrequencyContainer2, Object);
  itkNewMacro(Self);

  /** instance idenfitifer alias */
  typedef MeasurementVectorTraits::InstanceIdentifier InstanceIdentifier;

  /** Absolute frequency type alias */
  typedef MeasurementVectorTraits::AbsoluteFrequencyType  AbsoluteFrequencyType;
  
  /** Absolute Total frequency type */
  typedef MeasurementVectorTraits::TotalAbsoluteFrequencyType  TotalAbsoluteFrequencyType;

  /** Relative frequency type alias */
  typedef MeasurementVectorTraits::RelativeFrequencyType       RelativeFrequencyType;
  
  /** Relative Relative frequency type */
  typedef MeasurementVectorTraits::TotalRelativeFrequencyType  TotalRelativeFrequencyType;

  /** Histogram typedef support */
  typedef std::map< InstanceIdentifier, AbsoluteFrequencyType > FrequencyContainerType;  
  typedef FrequencyContainerType::const_iterator 
          FrequencyContainerConstIterator;   

  /** prepares the frequency container */
  void Initialize(unsigned long length);

  /** Calls the SetToZero method of superclass to initialize all the bins to Zero.
   *  This should be done before starting to call the IncreaseFrequency method. */
  void SetToZero();

  /** Method to set the frequency of histogram using instance identifier. It
   * returns false when the Id is out of bounds */
  bool SetFrequency(const InstanceIdentifier id, const AbsoluteFrequencyType value);

  /** Method to increase the frequency by one.  This function is convinent
   * to create a histogram. It returns false when the id is out of bounds. */
  bool IncreaseFrequency(const InstanceIdentifier id, 
                         const AbsoluteFrequencyType value);

  /** Method to get the frequency of a bin from the histogram. It will return
   * zero when the Id is out of bounds.  */
  AbsoluteFrequencyType GetFrequency(const InstanceIdentifier id) const;

  TotalAbsoluteFrequencyType GetTotalFrequency()
    { 
    return m_TotalFrequency;
    }

protected:
  SparseFrequencyContainer2();
  virtual ~SparseFrequencyContainer2() {}
  void PrintSelf(std::ostream& os, Indent indent) const;

private:
  SparseFrequencyContainer2(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  // Container of histogram
  FrequencyContainerType                                  m_FrequencyContainer;
  TotalAbsoluteFrequencyType                              m_TotalFrequency;
}; // end of class

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

#endif