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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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