packable_tree.h

Go to the documentation of this file.

#ifndef PACKABLE_TREE_CLASS
#define PACKABLE_TREE_CLASS
 
/*****************************************************************************\
*                                                                             *
*  Name   : packable_tree                                                     *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 1992-$now By Author.  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 is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/
 
#include "tree.h"
 
#include <basis/byte_array.h>
 
namespace nodes {
 
// forward.
class packable_tree_factory;
 
 
class packable_tree : public tree, public virtual basis::packable
{
public:
  packable_tree();
 
  // the recursive packing methods here will operate on all nodes starting at this one
  // and moving downwards to all branches.
 
  int recursive_packed_size() const;
 
  void recursive_pack(basis::byte_array &packed_form) const;
  
  static packable_tree *recursive_unpack(basis::byte_array &packed_form,
           packable_tree_factory &creator);
 
  // standard pack, unpack and packed_size methods must be implemented by the derived tree.
 
private:
  static void packit(basis::byte_array &packed_form, const packable_tree *current_node);
  static void calcit(int &size_accumulator, const packable_tree *current_node);
};
 
 
class packable_tree_factory
{
public:
  virtual ~packable_tree_factory();
  virtual packable_tree *create() = 0;
 
};
 
} // namespace.
 
#endif