148 lines
3.5 KiB
C++
148 lines
3.5 KiB
C++
/*
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This file is part of Daydream Engine.
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Copyright 2014 Adam Byléhn, Tobias Dahl, Simon Holmberg, Viktor Ljung
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Daydream Engine is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser 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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Daydream Engine 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with Daydream Engine. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ComponentFactory_h__
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#define ComponentFactory_h__
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#include <string>
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#include <memory>
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#include <functional>
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#include <map>
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namespace dd
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{
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/** Generic object factory.
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Creates dynamically allocated objects of base type T.
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@tparam T Object type.
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*/
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template <typename T>
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class Factory
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{
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public:
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/*void Register(std::string name, std::function<T(void)> factoryFunction)
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{
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m_FactoryFunctions[name] = factoryFunction;
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}*/
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/** Register a custom factory function for a type with the factory.
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@tparam T2 Object type of base type T.
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@param factoryFunction The lambda factory function.
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*/
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template <typename T2>
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void Register(std::function<T*(void)> factoryFunction)
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{
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m_FactoryFunctions[typeid(T2).name()] = factoryFunction;
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}
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/** Register a type with the factory.
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@tparam T2 Object type of base type T.
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*/
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template <typename T2>
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void Register()
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{
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m_FactoryFunctions[typeid(T2).name()] = []() { return new T2(); };
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m_CopyFunctions[typeid(T2).name()] = [](const T* t) { return new T2(*static_cast<const T2*>(t)); };
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}
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/** Create an instance of a specific typename.
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@param name Typename of type of base type T, as a string.
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@returns Pointer to the new object of type T.
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*/
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T* Create(std::string name)
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{
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auto it = m_FactoryFunctions.find(name);
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if (it != m_FactoryFunctions.end())
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{
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return it->second();
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}
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else
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{
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return nullptr;
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}
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}
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/** Create an instance of a specific type.
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@tparam T2 Type of base type T.
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@returns Pointer to the new object of type T.
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*/
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template <typename T2>
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T* Create()
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{
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auto it = m_FactoryFunctions.find(typeid(T2).name());
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if (it != m_FactoryFunctions.end())
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{
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return it->second();
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}
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else
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{
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return nullptr;
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}
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}
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/** Create a copy of an existing object of a specific _type_ registered with the factory.
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@param name Typename of type of base type T, as a string.
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@param toCopy The existing object to copy.
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@returns Pointer to the new object of type T2.
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*/
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T* Copy(std::string name, const T* toCopy)
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{
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auto it = m_CopyFunctions.find(name);
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if (it != m_CopyFunctions.end())
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{
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return it->second(toCopy);
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}
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else
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{
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return nullptr;
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}
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}
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/** Create a copy of an existing object of a specific _typename_ registered with the factory.
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@tparam T2 Type of base type T.
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@param toCopy The existing object to copy.
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@returns Pointer to the new object of type T2.
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*/
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template <typename T2>
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T* Copy(const T* toCopy)
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{
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auto it = m_CopyFunctions.find(typeid(T2).name());
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if (it != m_CopyFunctions.end())
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{
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return it->second(toCopy);
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} else
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{
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return nullptr;
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}
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}
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private:
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std::map<std::string, std::function<T*(void)>> m_FactoryFunctions;
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std::map<std::string, std::function<T*(const T*)>> m_CopyFunctions;
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};
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}
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#endif // ComponentFactory_h__
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