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89 lines
2.8 KiB
C++
89 lines
2.8 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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namespace caf
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{
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class PdmObject;
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//==================================================================================================
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/// "Private" class for implementation of a factory for PdmObjectBase derived objects
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/// Every PdmObject must register with this factory to be readable
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/// This class can be considered private in the Pdm system
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//==================================================================================================
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class PdmObjectFactory
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{
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public:
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static PdmObjectFactory * instance();
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PdmObject * create(const QString& classNameKeyword);
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template< typename PdmObjectBaseDerivative >
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bool registerCreator()
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{
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std::map<QString, PdmObjectCreatorBase*>::iterator entryIt;
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QString classNameKeyword = PdmObjectBaseDerivative::classKeywordStatic();
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entryIt = m_factoryMap.find(classNameKeyword);
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if (entryIt == m_factoryMap.end())
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{
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m_factoryMap[classNameKeyword] = new PdmObjectCreator<PdmObjectBaseDerivative>();
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return true;
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}
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else
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{
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assert(classNameKeyword != entryIt->first); // classNameKeyword has already been used
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assert(false); // To be sure ..
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return false; // never hit;
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}
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}
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private:
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PdmObjectFactory() {}
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~PdmObjectFactory() { /* Could clean up, but ... */ }
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// Internal helper classes
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class PdmObjectCreatorBase
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{
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public:
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PdmObjectCreatorBase() {}
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virtual ~PdmObjectCreatorBase() {}
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virtual PdmObject * create() = 0;
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};
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template< typename PdmObjectBaseDerivative >
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class PdmObjectCreator : public PdmObjectCreatorBase
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{
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public:
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virtual PdmObject * create() { return new PdmObjectBaseDerivative(); }
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};
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// Map to store factory
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std::map<QString, PdmObjectCreatorBase*> m_factoryMap;
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};
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} //End of namespace caf
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