💿🐜 Antkeeper source code
https://antkeeper.com
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141 lines
3.6 KiB
141 lines
3.6 KiB
/*
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* Copyright (C) 2017-2019 Christopher J. Howard
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*
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* This file is part of Antkeeper Source Code.
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*
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* Antkeeper Source Code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper Source Code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef COMPONENT_MANAGER_HPP
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#define COMPONENT_MANAGER_HPP
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#include "entity-id.hpp"
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#include "component.hpp"
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#include <list>
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#include <map>
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class ComponentObserver;
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/// Maps component types to components.
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typedef std::map<ComponentType, ComponentBase*> ComponentMap;
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/// Maps entity IDs to a component map.
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typedef std::map<EntityID, ComponentMap> EntityComponentMap;
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/**
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* Manages the aggregation of components which make up entities.
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*/
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class ComponentManager
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{
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public:
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/**
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* Creates an instance of ComponentManager.
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*/
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ComponentManager() = default;
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/**
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* Destroys an instance of ComponentManager.
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*/
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~ComponentManager() = default;
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/**
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* Adds a ComponentObserver.
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*
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* @param observer Pointer to the observer to add.
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*/
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void addComponentObserver(ComponentObserver* observer);
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/**
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* Removes a ComponentObserver.
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*
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* @param observer Pointer to the observer to remove.
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*/
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void removeComponentObserver(ComponentObserver* observer);
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/**
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* Adds a component to the specified entity.
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*
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* @param entity Specifies an entity.
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* @param component Specifies the component to add.
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*/
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void addComponent(EntityID entity, ComponentBase* component);
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/**
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* Removes a component from the specified entity.
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*
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* @param entity Specifies an entity.
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* @param type Specifies the type of component.
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*
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* @return Pointer to the removed component.
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*/
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ComponentBase* removeComponent(EntityID entity, ComponentType type);
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/**
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* Returns the specified component of an entity.
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*
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* @param entity Specifies an entity.
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* @param type Specifies the type of component.
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*
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* @return Pointer to the component, or `nullptr` if the specified component was not found.
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*/
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ComponentBase* getComponent(EntityID entity, ComponentType type);
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/**
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* Returns the specified component of an entity.
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*
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* @param entity Specifies an entity.
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* @tparam type Specifies the component type.
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*
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* @return Pointer to the component, or `nullptr` if the specified component was not found.
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*/
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template <typename T>
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T* getComponent(EntityID entity);
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/**
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* Returns the component map of the specified entity.
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*
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* @param entity Specifies an entity.
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*
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* @return Pointer to the component map.
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*/
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ComponentMap* getComponents(EntityID entity);
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private:
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ComponentManager(const ComponentManager&) = delete;
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ComponentManager& operator=(const ComponentManager&) = delete;
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EntityComponentMap entityMap;
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std::list<ComponentObserver*> componentObservers;
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};
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template <typename T>
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T* ComponentManager::getComponent(EntityID entity)
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{
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ComponentMap& componentMap = entityMap[entity];
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auto it = componentMap.find(T::TYPE);
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if (it == componentMap.end())
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{
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return nullptr;
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}
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return static_cast<T*>(it->second);
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}
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inline ComponentMap* ComponentManager::getComponents(EntityID entity)
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{
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return &entityMap[entity];
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}
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#endif // COMPONENT_MANAGER_HPP
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