graph_to_tree.H

/*
  This file is part of Aleph system

  Copyright (c) 2002, 2003, 2004, 2005, 2006
  UNIVERSITY LOS ANDES (ULA) Merida - REPÚBLICA BOLIVARIANA DE VENEZUELA  

  - Center of Studies in Microelectronics & Distributed Systems (CEMISID) 
  - ULA Computer Science Department
  - FUNDACITE Mérida - Ministerio de Ciencia y Tecnología

  PERMISSION TO USE, COPY, MODIFY AND DISTRIBUTE THIS SOFTWARE AND ITS
  DOCUMENTATION IS HEREBY GRANTED, PROVIDED THAT BOTH THE COPYRIGHT
  NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES OF THE
  SOFTWARE, DERIVATIVE WORKS OR MODIFIED VERSIONS, AND ANY PORTIONS
  THEREOF, AND THAT BOTH NOTICES APPEAR IN SUPPORTING DOCUMENTATION.

  Aleph is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  or FITNESS FOR A PARTICULAR PURPOSE.

  UNIVERSIDAD DE LOS ANDES requests users of this software to return to 

  Leandro Leon
  CEMISID 
  Ed La Hechicera 
  3er piso, ala sur
  Facultad de Ingenieria 
  Universidad de Los Andes 
  Merida - REPÚBLICA BOLIVARIANA DE VENEZUELA    or

  lrleon@ula.ve

  any improvements or extensions that they make and grant Universidad 
  de Los Andes (ULA) the rights to redistribute these changes. 

  Aleph is (or was) granted by: 
  - Consejo de Desarrollo Cientifico, Humanistico, Tecnico de la ULA 
    (CDCHT)
  - Fundacite Mérida
*/


# ifndef GRAPH_TO_TREE_H
# define GRAPH_TO_TREE_H

# include <tpl_tree_node.H>
# include <tpl_graph.H>
# include <tpl_graph_utils.H>

namespace Aleph
{

    template <typename GT, typename Key, class Convert> static
Tree_Node<Key> * graph_to_tree_node(GT & g, typename GT::Node * groot);
    template <typename GT, typename Key, class Convert> static void 
__graph_to_tree_node(GT & g, typename GT::Node * groot, Tree_Node<Key> * troot);
    template <typename GT, typename Key, class Convert> inline
Tree_Node<Key> * graph_to_tree_node(GT & g, typename GT::Node * groot)
{ 

  if (not Aleph::is_acyclique(g))
    throw std::domain_error("Graph is not a tree (not acyclique)");

  Tree_Node<Key> * troot = new Tree_Node<Key>; // apartar memoria para raíz

  Convert () (groot, troot); //convertir de groot y copiar a troot

      // llamada recursiva que construye el Tree_Node<Key>
  __graph_to_tree_node <GT, Key, Convert> (g, groot, troot);

  return troot;
}
    template <typename GT, typename Key, typename Convert> static
void __graph_to_tree_node(GT &                g, 
                          typename GT::Node * groot,
                          Tree_Node<Key> *    troot)
{           
  typedef typename GT::Node_Arc_Iterator Iterator;
  typedef typename GT::Node Node;
  typedef typename GT::Arc Arc;

      // recorrer arcos de groot y construir recursivamente
  for (Iterator it(groot); it.has_current(); it.next())
    {
      Arc * arc = it.get_current_arc();

      if (IS_ARC_VISITED(arc, Convert_Tree))
        continue;

      ARC_BITS(arc).set_bit(Convert_Tree, true); // marcar visitado arc 

      Node * gtgt = it.get_tgt_node();

      Tree_Node<Key> * ttgt = new Tree_Node<Key>; // crear nuevo nodo

      Convert () (gtgt, ttgt); // asignarle la clave

      troot->insert_rightmost_child(ttgt); // insertarlo como hijo 

      __graph_to_tree_node <GT, Key, Convert> (g, gtgt, ttgt);
    }
}

} // end namespace Aleph

# endif // GRAPH_TO_TREE_H

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