ResInsight/cafProjectDataModel/cafPdmObjectFactory.h
2012-05-18 09:45:23 +02:00

89 lines
2.8 KiB
C++

//##################################################################################################
//
// Custom Visualization Core library
// Copyright (C) 2011-2012 Ceetron AS
//
// This library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.
//
// See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
// for more details.
//
//##################################################################################################
#pragma once
#include <assert.h>
namespace caf
{
class PdmObject;
//==================================================================================================
/// "Private" class for implementation of a factory for PdmObjectBase derived objects
/// Every PdmObject must register with this factory to be readable
/// This class can be considered private in the Pdm system
//==================================================================================================
class PdmObjectFactory
{
public:
static PdmObjectFactory * instance();
PdmObject * create(const QString& classNameKeyword);
template< typename PdmObjectBaseDerivative >
bool registerCreator()
{
std::map<QString, PdmObjectCreatorBase*>::iterator entryIt;
QString classNameKeyword = PdmObjectBaseDerivative::classKeywordStatic();
entryIt = m_factoryMap.find(classNameKeyword);
if (entryIt == m_factoryMap.end())
{
m_factoryMap[classNameKeyword] = new PdmObjectCreator<PdmObjectBaseDerivative>();
return true;
}
else
{
assert(classNameKeyword != entryIt->first); // classNameKeyword has already been used
assert(false); // To be sure ..
return false; // never hit;
}
}
private:
PdmObjectFactory() {}
~PdmObjectFactory() { /* Could clean up, but ... */ }
// Internal helper classes
class PdmObjectCreatorBase
{
public:
PdmObjectCreatorBase() {}
virtual ~PdmObjectCreatorBase() {}
virtual PdmObject * create() = 0;
};
template< typename PdmObjectBaseDerivative >
class PdmObjectCreator : public PdmObjectCreatorBase
{
public:
virtual PdmObject * create() { return new PdmObjectBaseDerivative(); }
};
// Map to store factory
std::map<QString, PdmObjectCreatorBase*> m_factoryMap;
};
} //End of namespace caf