mirror of
https://github.com/emsesp/EMS-ESP32.git
synced 2025-12-08 00:39:50 +03:00
102 lines
4.1 KiB
C++
102 lines
4.1 KiB
C++
/*
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* EMS-ESP - https://github.com/emsesp/EMS-ESP
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* Copyright 2020-2023 Paul Derbyshire
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*
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* This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EMSESP_EMSFACTORY_H_
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#define EMSESP_EMSFACTORY_H_
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#include <map>
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#include <memory> // for unique_ptr
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#include "emsdevice.h"
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// Macro for class registration
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// Anonymous namespace is used to make the definitions here private to the current
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// compilation unit (current file). It is equivalent to the old C static keyword.
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#define REGISTER_FACTORY(derivedClass, device_type) \
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namespace { \
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auto registry_##derivedClass = ConcreteEMSFactory<derivedClass>(device_type); \
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}
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namespace emsesp {
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class EMSdevice; // forward declaration, for gcc linking
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class EMSFactory {
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public:
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virtual ~EMSFactory() = default;
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// Register factory object of derived class
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// using the device_type as the unique identifier
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static auto registerFactory(const uint8_t device_type, EMSFactory * factory) -> void {
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auto & reg = EMSFactory::getRegister();
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reg[device_type] = factory;
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}
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using FactoryMap = std::map<uint8_t, EMSFactory *>;
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// returns all registered classes (really only for debugging)
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static auto device_handlers() -> FactoryMap {
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return EMSFactory::getRegister();
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}
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// Construct derived class returning an unique ptr
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static auto add(const uint8_t device_type, uint8_t device_id, uint8_t product_id, const char * version, const char * name, uint8_t flags, uint8_t brand)
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-> std::unique_ptr<EMSdevice> {
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return std::unique_ptr<EMSdevice>(EMSFactory::makeRaw(device_type, device_id, product_id, version, name, flags, brand));
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}
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virtual auto construct(uint8_t device_type, uint8_t device_id, uint8_t product_id, const char * version, const char * name, uint8_t flags, uint8_t brand) const
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-> EMSdevice * = 0;
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private:
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// Force global variable to be initialized, thus it avoids the "initialization order fiasco"
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static auto getRegister() -> FactoryMap & {
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static FactoryMap classRegister{};
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return classRegister;
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}
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// Construct derived class returning a raw pointer
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// find which EMS device it is and use that class
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static auto makeRaw(const uint8_t device_type, uint8_t device_id, uint8_t product_id, const char * version, const char * name, uint8_t flags, uint8_t brand)
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-> EMSdevice * {
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auto it = EMSFactory::getRegister().find(device_type);
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if (it != EMSFactory::getRegister().end()) {
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return it->second->construct(device_type, device_id, product_id, version, name, flags, brand);
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}
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return nullptr;
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}
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};
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template <typename DerivedClass>
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class ConcreteEMSFactory : EMSFactory {
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public:
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// Register this global object on the EMSFactory register
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ConcreteEMSFactory(const uint8_t device_type) {
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EMSFactory::registerFactory(device_type, this);
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}
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auto construct(uint8_t device_type, uint8_t device_id, uint8_t product_id, const char * version, const char * name, uint8_t flags, uint8_t brand) const
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-> EMSdevice * {
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return new DerivedClass(device_type, device_id, product_id, version, name, flags, brand);
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}
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};
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} // namespace emsesp
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#endif
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