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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkOneWayEquivalencyTable.cxx
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.
=========================================================================*/
#include "itkOneWayEquivalencyTable.h"
namespace itk
{
bool OneWayEquivalencyTable::Add(unsigned long a, unsigned long b)
{
//
// Unlike EquivalencyTable, the order of the equivalence is important.
//
std::pair<Iterator, bool> result;
if (a == b) return false;
result = m_HashMap.insert( ValueType(a, b) );
return result.second;
}
//void OneWayEquivalencyTable::PrintHashTable()
//{
// ConstIterator it = this->Begin();
// while (it != this->End() )
// {
// std::cout << (*it).first << " = " << (*it).second << std::endl;
// it++;
// }
//}
void OneWayEquivalencyTable::Flatten()
{
Iterator it = this->Begin();
while ( it != this->End() )
{
(*it).second = this->RecursiveLookup((*it).first);
it++;
}
}
unsigned long OneWayEquivalencyTable::RecursiveLookup(const unsigned long a) const
{
unsigned long ans = a;
unsigned long last_ans=a;
ConstIterator it;
ConstIterator hashEnd = m_HashMap.end();
while ( (it = m_HashMap.find(ans)) != hashEnd )
{
ans = (*it).second;
if (ans == a ) return last_ans; // about to cycle again.
last_ans = ans;
}
return ans;
}
void
OneWayEquivalencyTable
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
}
}// end namespace itk
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