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138 lines
3.4 KiB
C++
138 lines
3.4 KiB
C++
//
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// DynamicFactory.h
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//
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// Library: Foundation
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// Package: Core
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// Module: DynamicFactory
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//
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// Definition of the DynamicFactory class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_DynamicFactory_INCLUDED
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#define Foundation_DynamicFactory_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Instantiator.h"
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#include "Poco/Exception.h"
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#include "Poco/Mutex.h"
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#include <map>
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#include <memory>
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namespace Poco {
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template <class Base>
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class DynamicFactory
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/// A factory that creates objects by class name.
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{
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public:
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typedef AbstractInstantiator<Base> AbstractFactory;
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DynamicFactory()
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/// Creates the DynamicFactory.
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{
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}
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~DynamicFactory()
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/// Destroys the DynamicFactory and deletes the instantiators for
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/// all registered classes.
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{
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for (auto& p: _map)
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{
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delete p.second;
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}
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}
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Base* createInstance(const std::string& className) const
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/// Creates a new instance of the class with the given name.
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/// The class must have been registered with registerClass.
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/// If the class name is unknown, a NotFoundException is thrown.
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{
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FastMutex::ScopedLock lock(_mutex);
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typename FactoryMap::const_iterator it = _map.find(className);
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if (it != _map.end())
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return it->second->createInstance();
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else
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throw NotFoundException(className);
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}
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template <class C>
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void registerClass(const std::string& className)
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/// Registers the instantiator for the given class with the DynamicFactory.
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/// The DynamicFactory takes ownership of the instantiator and deletes
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/// it when it's no longer used.
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/// If the class has already been registered, an ExistsException is thrown
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/// and the instantiator is deleted.
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{
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registerClass(className, new Instantiator<C, Base>);
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}
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void registerClass(const std::string& className, AbstractFactory* pAbstractFactory)
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/// Registers the instantiator for the given class with the DynamicFactory.
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/// The DynamicFactory takes ownership of the instantiator and deletes
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/// it when it's no longer used.
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/// If the class has already been registered, an ExistsException is thrown
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/// and the instantiator is deleted.
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{
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poco_check_ptr (pAbstractFactory);
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FastMutex::ScopedLock lock(_mutex);
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std::unique_ptr<AbstractFactory> ptr(pAbstractFactory);
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typename FactoryMap::iterator it = _map.find(className);
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if (it == _map.end())
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_map[className] = ptr.release();
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else
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throw ExistsException(className);
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}
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void unregisterClass(const std::string& className)
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/// Unregisters the given class and deletes the instantiator
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/// for the class.
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/// Throws a NotFoundException if the class has not been registered.
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{
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FastMutex::ScopedLock lock(_mutex);
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typename FactoryMap::iterator it = _map.find(className);
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if (it != _map.end())
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{
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delete it->second;
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_map.erase(it);
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}
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else throw NotFoundException(className);
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}
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bool isClass(const std::string& className) const
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/// Returns true iff the given class has been registered.
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{
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FastMutex::ScopedLock lock(_mutex);
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return _map.find(className) != _map.end();
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}
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private:
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DynamicFactory(const DynamicFactory&);
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DynamicFactory& operator = (const DynamicFactory&);
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typedef std::map<std::string, AbstractFactory*> FactoryMap;
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FactoryMap _map;
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mutable FastMutex _mutex;
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};
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} // namespace Poco
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#endif // Foundation_DynamicFactory_INCLUDED
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