ObjectRegistry.h

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef TRINITY_OBJECTREGISTRY_H
#define TRINITY_OBJECTREGISTRY_H
 
#include <string>
#include <map>
#include <memory>
 
template<class T, class Key = std::string>
class ObjectRegistry final
{
 public:
 typedef std::map<Key, std::unique_ptr<T>> RegistryMapType;
 
 static ObjectRegistry<T, Key>* instance()
 {
 static ObjectRegistry<T, Key> instance;
 return &instance;
 }
 
 T const* GetRegistryItem(Key const& key) const
 {
 auto itr = _registeredObjects.find(key);
 if (itr == _registeredObjects.end())
 return nullptr;
 return itr->second.get();
 }
 
 bool InsertItem(T* obj, Key const& key, bool force = false)
 {
 auto itr = _registeredObjects.find(key);
 if (itr != _registeredObjects.end())
 {
 if (!force)
 return false;
 _registeredObjects.erase(itr);
 }
 
 _registeredObjects.emplace(std::piecewise_construct, std::forward_as_tuple(key), std::forward_as_tuple(obj));
 return true;
 }
 
 bool HasItem(Key const& key) const
 {
 return (_registeredObjects.count(key) > 0);
 }
 
 RegistryMapType const& GetRegisteredItems() const
 {
 return _registeredObjects;
 }
 
 private:
 RegistryMapType _registeredObjects;
 
 // non instanceable, only static
 ObjectRegistry() { }
 ~ObjectRegistry() { }
 ObjectRegistry(ObjectRegistry const&) = delete;
 ObjectRegistry& operator=(ObjectRegistry const&) = delete;
};
 
#endif