objiter.cc

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/*
Copyright (C) 2002  The Exult Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif
#include "objiter.h"
#include "contain.h"
#include "gamewin.h"
#include "chunks.h"

/*
 *  Create to start after/before a given object within a chunk.
 */

template<class D> 
D_Recursive_object_iterator<D>::D_Recursive_object_iterator
  (
  Game_object *start    // Start here.
  ) : elems(start->get_outermost()->get_chunk()->get_objects()), child(0)
  {
          // Get what obj. is in (or itself).
  Game_object *owner = start->get_outermost();
  Game_object *obj;   // Find owner within its chunk.
  while ((obj = get_next()) != 0 && obj != owner)
    ;
  if (!obj)
    return;     // Bad.  It wasn't found.
  if (obj != start)   // Given object contained?
          // Look within for it.
    while ((obj = get_next()) != 0 && obj != start)
      ;
  }

/*
 *  Get next game object, going down recursively into containers.
 *
 *  Output: Next in world, or 0 if done.
 */

template<class D> Game_object *D_Recursive_object_iterator<D>::get_next
  (
  )
  {
  Game_object *obj;
  if (child)      // Going through container?
    {
    obj = child->get_next();
    if (obj)
      return obj;
    delete child;
    child = 0;    // Child done.
    }
  obj = elems.get_next();   // Get next from our list.
  if (!obj)
    return 0;   // All done.
          // Is it a container?
  Container_game_object *c = obj->as_container();
  if (c)        // Container?  Set to go through it.
    child = new D_Recursive_object_iterator<D>(
              c->get_objects());
  return obj;
  }

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