itkOneWayEquivalencyTable.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkOneWayEquivalencyTable.h,v $
  Language:  C++
  Date:      $Date: 2009-02-19 19:41:22 $
  Version:   $Revision: 1.14 $

  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 __itkOneWayEquivalencyTable_h
#define __itkOneWayEquivalencyTable_h

#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif

#include "itkObjectFactory.h"
#include "itkDataObject.h"
#include "itkProcessObject.h"
#include "itk_hash_map.h"

namespace itk
{
class ITKCommon_EXPORT OneWayEquivalencyTable : public DataObject
{
public:
  typedef OneWayEquivalencyTable   Self;
  typedef DataObject               Superclass;
  typedef SmartPointer<Self>       Pointer;
  typedef SmartPointer<const Self> ConstPointer;
  itkNewMacro(Self);
  itkTypeMacro(OneWayEquivalencyTable, DataObject);

  typedef itk::hash_map<unsigned long, unsigned long,
                        itk::hash<unsigned long> > HashTableType;
  typedef HashTableType::iterator                  Iterator;
  typedef HashTableType::const_iterator            ConstIterator;
  typedef HashTableType::value_type                ValueType;

  void Flatten();

  bool Add(unsigned long a, unsigned long b);

  unsigned long Lookup(const unsigned long a) const
    {
    ConstIterator result = m_HashMap.find(a);
    if ( result == m_HashMap.end() ) return a;
    else return (*result).second;
    }

  unsigned long RecursiveLookup(const unsigned long a) const;

  bool IsEntry(const unsigned long a) const
    {
    if ( m_HashMap.find(a) == m_HashMap.end() ) return false;
    else return true;
    }

  void Erase(const unsigned long a)
    {  m_HashMap.erase(a); }

  void Clear()
    {      m_HashMap.clear();    }

  bool Empty() const
    {      return m_HashMap.empty();    }

  Iterator Begin() { return m_HashMap.begin(); }

  Iterator End()   { return m_HashMap.end();   }

  //  void PrintHashTable();

protected:
  OneWayEquivalencyTable()  {}
  virtual ~OneWayEquivalencyTable() {}
  OneWayEquivalencyTable(const Self&); // purposely not implemented
  void operator=(const Self&); // purposely not implemented
  void PrintSelf(std::ostream& os, Indent indent) const;

  HashTableType m_HashMap;
};

}// end namespace itk

#endif