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122 lines
3.8 KiB
C++
122 lines
3.8 KiB
C++
//##################################################################################################
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//
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// Custom Visualization Core library
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// Copyright (C) 2011-2012 Ceetron AS
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//
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// This library 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 library is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
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// for more details.
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//
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//##################################################################################################
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#pragma once
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#include <assert.h>
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#include <map>
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namespace caf
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{
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//==================================================================================================
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/// A generic Factory class template
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/// Usage:
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/// Initialization in source file (Initialization :
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/// bool TypeToCreate_Factory_initialized = caf::Factory<BaseType, KeyType>::instance()->registerCreator<TypeToCreate>(key);
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/*INIT_FACTORY(BaseType, KeyType,TypeToCreate )
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bool TypeToCreate_Factory_initialized = caf::Factory<BaseType, KeyType>::instance()->registerCreator<TypeToCreate>(QString("TypeToCreate"));*/
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/// When you need an object:
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/// BaseType* newObject = caf::Factory<BaseType, KeyType>::instance()->create(key);
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//==================================================================================================
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template<typename BaseType, typename KeyType>
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class Factory
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{
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class ObjectCreatorBase;
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public:
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typedef typename std::map<KeyType, ObjectCreatorBase*>::iterator iterator_type;
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static Factory<BaseType, KeyType> * instance()
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{
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static Factory<BaseType, KeyType>* fact = new Factory<BaseType, KeyType>;
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return fact;
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}
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template< typename TypeToCreate >
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bool registerCreator(const KeyType& key)
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{
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iterator_type entryIt;
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entryIt = m_factoryMap.find(key);
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if (entryIt == m_factoryMap.end())
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{
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m_factoryMap[key] = new ObjectCreator<TypeToCreate>();
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return true;
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}
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else
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{
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assert(key != entryIt->first); // classNameKeyword has already been used
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assert(false); // To be sure ..
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return false;
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}
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}
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BaseType* create(const KeyType& key)
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{
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iterator_type entryIt;
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entryIt = m_factoryMap.find(key);
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if (entryIt != m_factoryMap.end())
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{
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return entryIt->second->create();
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}
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else
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{
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return NULL;
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}
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}
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private:
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Factory () {}
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~Factory()
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{
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iterator_type entryIt;
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for (entryIt = m_factoryMap.begin(); entryIt != m_factoryMap.end(); ++entryIt)
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{
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delete(entryIt->second);
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}
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}
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// Internal helper classes
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class ObjectCreatorBase
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{
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public:
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ObjectCreatorBase() {}
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virtual ~ObjectCreatorBase() {}
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virtual BaseType * create() = 0;
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};
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template< typename TypeToCreate >
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class ObjectCreator : public ObjectCreatorBase
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{
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public:
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virtual BaseType * create() { return new TypeToCreate(); }
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};
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// Map to store factory
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std::map<KeyType, ObjectCreatorBase*> m_factoryMap;
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};
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}//End of namespace caf
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