config_watcher.h

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#ifndef CONFIG_WATCHER_CLASS
#define CONFIG_WATCHER_CLASS
 
/*****************************************************************************\
*                                                                             *
*  Name   : config_watcher                                                    *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 2008-$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 "configurator.h"
#include "table_configurator.h"
 
#include <basis/contracts.h>
#include <structures/set.h>
 
namespace configuration {
 
 
class config_watcher
{
public:
  config_watcher(configurator &to_watch);
 
  virtual ~config_watcher();
 
  DEFINE_CLASS_NAME("config_watcher");
 
  bool rescan();
 
  // these lists describe how sections have changed, if at all.
  structures::string_set new_sections() const;
  structures::string_set deleted_sections() const;
  structures::string_set changed_sections() const;
 
  // methods for comparing changes within sections in the config.
  structures::string_set new_items(const basis::astring &section_name);
  structures::string_set deleted_items(const basis::astring &section_name);
  structures::string_set changed_items(const basis::astring &section_name);
 
private:
  configurator &_watching;  
  table_configurator *_current_config;  
  table_configurator *_previous_config;  
};
 
} //namespace.
 
#endif