💿🐜 Antkeeper source code https://antkeeper.com
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/*
* Copyright (C) 2017-2019 Christopher J. Howard
*
* This file is part of Antkeeper Source Code.
*
* Antkeeper Source Code 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.
*
* Antkeeper Source Code 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 Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef COMPONENT_MANAGER_HPP
#define COMPONENT_MANAGER_HPP
#include "entity-id.hpp"
#include "component.hpp"
#include <list>
#include <map>
class ComponentObserver;
/// Maps component types to components.
typedef std::map<ComponentType, ComponentBase*> ComponentMap;
/// Maps entity IDs to a component map.
typedef std::map<EntityID, ComponentMap> EntityComponentMap;
/**
* Manages the aggregation of components which make up entities.
*/
class ComponentManager
{
public:
/**
* Creates an instance of ComponentManager.
*/
ComponentManager() = default;
/**
* Destroys an instance of ComponentManager.
*/
~ComponentManager() = default;
/**
* Adds a ComponentObserver.
*
* @param observer Pointer to the observer to add.
*/
void addComponentObserver(ComponentObserver* observer);
/**
* Removes a ComponentObserver.
*
* @param observer Pointer to the observer to remove.
*/
void removeComponentObserver(ComponentObserver* observer);
/**
* Adds a component to the specified entity.
*
* @param entity Specifies an entity.
* @param component Specifies the component to add.
*/
void addComponent(EntityID entity, ComponentBase* component);
/**
* Removes a component from the specified entity.
*
* @param entity Specifies an entity.
* @param type Specifies the type of component.
*
* @return Pointer to the removed component.
*/
ComponentBase* removeComponent(EntityID entity, ComponentType type);
/**
* Returns the specified component of an entity.
*
* @param entity Specifies an entity.
* @param type Specifies the type of component.
*
* @return Pointer to the component, or `nullptr` if the specified component was not found.
*/
ComponentBase* getComponent(EntityID entity, ComponentType type);
/**
* Returns the specified component of an entity.
*
* @param entity Specifies an entity.
* @tparam type Specifies the component type.
*
* @return Pointer to the component, or `nullptr` if the specified component was not found.
*/
template <typename T>
T* getComponent(EntityID entity);
/**
* Returns the component map of the specified entity.
*
* @param entity Specifies an entity.
*
* @return Pointer to the component map.
*/
ComponentMap* getComponents(EntityID entity);
private:
ComponentManager(const ComponentManager&) = delete;
ComponentManager& operator=(const ComponentManager&) = delete;
EntityComponentMap entityMap;
std::list<ComponentObserver*> componentObservers;
};
template <typename T>
T* ComponentManager::getComponent(EntityID entity)
{
ComponentMap& componentMap = entityMap[entity];
auto it = componentMap.find(T::TYPE);
if (it == componentMap.end())
{
return nullptr;
}
return static_cast<T*>(it->second);
}
inline ComponentMap* ComponentManager::getComponents(EntityID entity)
{
return &entityMap[entity];
}
#endif // COMPONENT_MANAGER_HPP