/*
 * SingletonPtr.h
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_COMMON_SINGLETONPTR_H_
#define MAD_COMMON_SINGLETONPTR_H_

#include "Initializable.h"
#include "Configurable.h"
#include "ConfigManager.h"

namespace Mad {
namespace Common {

template <typename T>
class SingletonPtr : public virtual Initializable {
  private:
    T *ptr;

  protected:
    virtual void doInit() {
      ptr = new T();

      Initializable *in = dynamic_cast<Initializable*>(ptr);
      if(in) {
        in->initialized = true;
        in->doInit();
      }

      Configurable *c = dynamic_cast<Configurable*>(ptr);
      if(c)
        ConfigManager::get()->registerConfigurable(c);

      if(in) {
        initializing = false;
        initialized = true;
      }
    }

    virtual void doDeinit() {
      Configurable *c = dynamic_cast<Configurable*>(ptr);
      if(c)
        ConfigManager::get()->unregisterConfigurable(c);

      Initializable *in = dynamic_cast<Initializable*>(ptr);
      if(in) {
        in->doDeinit();
        in->initialized = false;
      }

      delete ptr;
      ptr = 0;
    }

  public:
    SingletonPtr() : ptr(0) {}

    T *get() {
      if(!ptr)
        init();

      return ptr;
    }
};

}
}

#endif /* MAD_COMMON_SINGLETONPTR_H_ */