QxOrm 1.1.8
C++ Object Relational Mapping library
QxDao_IsDirty.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
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00024 ****************************************************************************/
00025 
00026 #ifndef _QX_DAO_IS_DIRTY_H_
00027 #define _QX_DAO_IS_DIRTY_H_
00028 
00029 #ifdef _MSC_VER
00030 #pragma once
00031 #endif
00032 
00033 #include <boost/static_assert.hpp>
00034 #include <boost/mpl/if.hpp>
00035 #include <boost/mpl/logical.hpp>
00036 #include <boost/type_traits/is_pointer.hpp>
00037 
00038 #include <QtCore/qstringlist.h>
00039 
00040 #include <QxDao/QxSqlQueryBuilder.h>
00041 #include <QxDao/IxSqlRelation.h>
00042 
00043 #include <QxTraits/is_qx_registered.h>
00044 #include <QxTraits/is_container.h>
00045 #include <QxTraits/is_smart_ptr.h>
00046 #include <QxTraits/generic_container.h>
00047 
00048 namespace qx {
00049 namespace dao {
00050 namespace detail {
00051 
00052 template <class T>
00053 inline void is_dirty(const T & obj1, const T & obj2, QStringList & lstDiff);
00054 
00055 template <class T>
00056 struct QxDao_IsDirty_Generic
00057 {
00058 
00059    static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
00060    {
00061       BOOST_STATIC_ASSERT(qx::trait::is_qx_registered<T>::value);
00062 
00063       qx::QxSqlQueryBuilder<T> builder; builder.init();
00064       qx::IxDataMember * pId = builder.getDataId();
00065       if (pId && (! pId->isEqual((& obj1), (& obj2)))) { lstDiff.append(pId->getKey()); }
00066 
00067       long l = 0;
00068       qx::IxDataMember * p = NULL;
00069       while ((p = builder.nextData(l)))
00070       { if (p && (! p->isEqual((& obj1), (& obj2)))) { lstDiff.append(p->getKey()); } }
00071    }
00072 
00073 };
00074 
00075 template <class T>
00076 struct QxDao_IsDirty_Container
00077 {
00078 
00079    static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
00080    {
00081       if (qx::trait::generic_container<T>::size(obj1) <= 0) { return; }
00082       if (qx::trait::generic_container<T>::size(obj1) != qx::trait::generic_container<T>::size(obj2)) { lstDiff.append("*"); return; }
00083 
00084       long lCurrIndex = 0;
00085       typename T::const_iterator it2 = obj2.begin();
00086 
00087       for (typename T::const_iterator it1 = obj1.begin(); it1 != obj1.end(); ++it1)
00088       {
00089          QStringList lstDiffItem;
00090          qx::dao::detail::is_dirty((* it1), (* it2), lstDiffItem);
00091          if (lstDiffItem.count() > 0) { lstDiff.append(QString::number(lCurrIndex) + "|" + lstDiffItem.join("|")); }
00092          ++lCurrIndex; ++it2;
00093       }
00094    }
00095 
00096 };
00097 
00098 template <class T>
00099 struct QxDao_IsDirty_Ptr
00100 {
00101 
00102    static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
00103    { qx::dao::detail::is_dirty((* obj1), (* obj2), lstDiff); }
00104 
00105 };
00106 
00107 template <class T>
00108 struct QxDao_IsDirty
00109 {
00110 
00111    static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
00112    {
00113       typedef typename boost::mpl::if_c< boost::is_pointer<T>::value, qx::dao::detail::QxDao_IsDirty_Ptr<T>, qx::dao::detail::QxDao_IsDirty_Generic<T> >::type type_dao_1;
00114       typedef typename boost::mpl::if_c< qx::trait::is_smart_ptr<T>::value, qx::dao::detail::QxDao_IsDirty_Ptr<T>, type_dao_1 >::type type_dao_2;
00115       typedef typename boost::mpl::if_c< qx::trait::is_container<T>::value, qx::dao::detail::QxDao_IsDirty_Container<T>, type_dao_2 >::type type_dao_3;
00116       type_dao_3::compare(obj1, obj2, lstDiff);
00117    }
00118 
00119 };
00120 
00121 template <class T>
00122 inline void is_dirty(const T & obj1, const T & obj2, QStringList & lstDiff)
00123 { return qx::dao::detail::QxDao_IsDirty<T>::compare(obj1, obj2, lstDiff); }
00124 
00125 } // namespace detail
00126 } // namespace dao
00127 } // namespace qx
00128 
00129 #endif // _QX_DAO_IS_DIRTY_H_
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