QxOrm 1.1.9
C++ Object Relational Mapping library
QxFactory.h
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00001 /****************************************************************************
00002 **
00003 ** http://www.qxorm.com/
00004 ** http://sourceforge.net/projects/qxorm/
00005 ** Original file by Lionel Marty
00006 **
00007 ** This file is part of the QxOrm library
00008 **
00009 ** This software is provided 'as-is', without any express or implied
00010 ** warranty. In no event will the authors be held liable for any
00011 ** damages arising from the use of this software.
00012 **
00013 ** GNU Lesser General Public License Usage
00014 ** This file must be used under the terms of the GNU Lesser
00015 ** General Public License version 2.1 as published by the Free Software
00016 ** Foundation and appearing in the file 'license.lgpl.txt' included in the
00017 ** packaging of this file.  Please review the following information to
00018 ** ensure the GNU Lesser General Public License version 2.1 requirements
00019 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
00020 **
00021 ** If you have questions regarding the use of this file, please contact :
00022 ** contact@qxorm.com
00023 **
00024 ****************************************************************************/
00025 
00026 #ifndef _QX_FACTORY_H_
00027 #define _QX_FACTORY_H_
00028 
00029 #ifdef _MSC_VER
00030 #pragma once
00031 #endif
00032 
00040 #include <boost/shared_ptr.hpp>
00041 #include <boost/static_assert.hpp>
00042 #include <boost/type_traits/is_abstract.hpp>
00043 
00044 #include <QxFactory/IxFactory.h>
00045 
00046 #include <QxTraits/get_base_class.h>
00047 #include <QxTraits/get_class_name.h>
00048 #include <QxTraits/get_primary_key.h>
00049 
00050 #define QX_STR_CANNOT_INSTANTIATE_ABSTRACT_CLASS "[QxOrm] qx::QxFactory<T> ---> cannot instantiate abstract class '%s'"
00051 
00052 namespace qx {
00053 
00054 template <class T>
00055 class QxClass;
00056 
00061 template <class T>
00062 class QxFactory : public IxFactory
00063 {
00064 
00065 public:
00066 
00067    QxFactory(const QString & sKey) : IxFactory(sKey) { ; }
00068    virtual ~QxFactory() { ; }
00069 
00070    virtual boost::any createObject() const
00071    { QxClass<T>::getSingleton(); return qxCreateInstance<boost::is_abstract<T>::value, 0>::create(); }
00072 
00073    virtual void * createObjectNudePtr() const
00074    { QxClass<T>::getSingleton(); return qxCreateInstance<boost::is_abstract<T>::value, 0>::createNudePtr(); }
00075 
00076 private:
00077 
00078    template <bool bIsAbstract /* = false */, int dummy>
00079    struct qxCreateInstance
00080    {
00081       static inline boost::any create()      { boost::shared_ptr<T> ptr; ptr.reset(new T()); return boost::any(ptr); }
00082       static inline void * createNudePtr()   { return static_cast<void *>(new T()); }
00083    };
00084 
00085    template <int dummy>
00086    struct qxCreateInstance<true, dummy>
00087    {
00088       static inline boost::any create()      { qDebug(QX_STR_CANNOT_INSTANTIATE_ABSTRACT_CLASS, qx::trait::get_class_name<T>::get()); return boost::any(); }
00089       static inline void * createNudePtr()   { qDebug(QX_STR_CANNOT_INSTANTIATE_ABSTRACT_CLASS, qx::trait::get_class_name<T>::get()); return NULL; }
00090    };
00091 
00092 };
00093 
00094 } // namespace qx
00095 
00096 #include "../../inl/QxFactory/QxFactory.inl"
00097 
00098 #endif // _QX_FACTORY_H_
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