// =========================================================================
// @author Leonardo Florez Valencia
// @email florez-l@javeriana.edu.co
// =========================================================================
#ifndef __fpa__Filters__RandomWalker__hxx__
#define __fpa__Filters__RandomWalker__hxx__

// -------------------------------------------------------------------------
template< class _TDataInterface >
void fpa::Filters::RandomWalker< _TDataInterface >::
SetWeightFunction( TScalarWeight* p )
{
  if( this->m_ScalarWeight.GetPointer( ) != p )
  {
    this->_Deassociate( this->m_ScalarWeight );
    this->m_ScalarWeight = p;
    this->_Associate( this->m_ScalarWeight );
    this->Modified( );

  } // fi
}

// -------------------------------------------------------------------------
template< class _TDataInterface >
void fpa::Filters::RandomWalker< _TDataInterface >::
SetWeightFunction( TVertexWeight* p )
{
  if( this->m_VertexWeight.GetPointer( ) != p )
  {
    this->_Deassociate( this->m_VertexWeight );
    this->m_VertexWeight = p;
    this->_Associate( this->m_VertexWeight );
    this->Modified( );

  } // fi
}

// -------------------------------------------------------------------------
template< class _TDataInterface >
fpa::Filters::RandomWalker< _TDataInterface >::
RandomWalker( )
  : Superclass( false )
{
  this->SetInitValue( TCost( 0 ) );
  /* TODO
     this->SetWeight(
     fpa::Functors::RegionGrow::Tautology< TInputValue >::New( )
     );
  */
}

// -------------------------------------------------------------------------
template< class _TDataInterface >
fpa::Filters::RandomWalker< _TDataInterface >::
~RandomWalker( )
{
}

// -------------------------------------------------------------------------
template< class _TDataInterface >
void fpa::Filters::RandomWalker< _TDataInterface >::
_PostComputeOutputValue( TNode& n )
{
  // Nothing to do with this algorithm
}

// -------------------------------------------------------------------------
template< class _TDataInterface >
void fpa::Filters::RandomWalker< _TDataInterface >::
_PreComputeOutputValue( TNode& n )
{
  if( this->m_VertexWeight.IsNotNull( ) )
  {
    TCost c = this->m_VertexWeight->Evaluate( n.Vertex, n.Parent );
    if( this->m_ScalarWeight.IsNotNull( ) )
      c = this->m_ScalarWeight->Evaluate( c );
    n.Value = c + this->_GetOutputValue( n.Parent );
  }
  else
    n.Value = TCost( -1 );
}

#endif // __fpa__Filters__RandomWalker__hxx__
// eof - $RCSfile$