OpenGTA/dataholder.h

/************************************************************************
* Copyright (c) 2005-2007 tok@openlinux.org.uk                          *
*                                                                       *
* This software is provided as-is, without any express or implied       *
* warranty. In no event will the authors be held liable for any         *
* damages arising from the use of this software.                        *
*                                                                       *
* Permission is granted to anyone to use this software for any purpose, *
* including commercial applications, and to alter it and redistribute   *
* it freely, subject to the following restrictions:                     *
*                                                                       *
* 1. The origin of this software must not be misrepresented; you must   *
* not claim that you wrote the original software. If you use this       *
* software in a product, an acknowledgment in the product documentation *
* would be appreciated but is not required.                             *
*                                                                       *
* 2. Altered source versions must be plainly marked as such, and must   *
* not be misrepresented as being the original software.                 *
*                                                                       *
* 3. This notice may not be removed or altered from any source          *
* distribution.                                                         *
************************************************************************/
#ifndef STYLE_HOLDER_H
#define STYLE_HOLDER_H
#include <string>
#include "opengta.h"
#include "m_exceptions.h"
#include "Singleton.h"

namespace OpenGTA {
  /** Wrapper around resource-holding classes.
   * - you have to call 'load' before 'get'
   *
   * - you may call load repeatedly
   */
  template <class T>
    class ActiveData {
      public:
        ActiveData();
        ~ActiveData();
        T & get();
        void load(const std::string & file);
      private:
        void unload();
        T* m_data;
    };

  /** The wrapper around the GRY/G24 data interface.
   */
  typedef ActiveData< GraphicsBase > ActiveStyle;
  /** The wrapper around the map data interface.
   */
  typedef ActiveData< Map > ActiveMap;
  /** The wrapper around the message-string data interface.
   */
  typedef ActiveData< MessageDB > MainMsgLookup;

  /** Singleton: Graphics
   */
  typedef Loki::SingletonHolder< ActiveStyle> StyleHolder;
  /** Singleton: Map
   */
  typedef Loki::SingletonHolder< ActiveMap> MapHolder;
  /** Singleton: Message strings
   */
  typedef Loki::SingletonHolder< MainMsgLookup> MainMsgHolder;


}

#endif