QxDao_IsDirty.h

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** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
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#ifndef _QX_DAO_IS_DIRTY_H_
#define _QX_DAO_IS_DIRTY_H_

#ifdef _MSC_VER
#pragma once
#endif

#include <QtCore/qstringlist.h>

#include <QxDao/QxSqlQueryBuilder.h>
#include <QxDao/IxSqlRelation.h>

#include <QxTraits/is_qx_registered.h>
#include <QxTraits/is_container.h>
#include <QxTraits/is_smart_ptr.h>
#include <QxTraits/generic_container.h>

namespace qx {
namespace dao {
namespace detail {

template <class T>
inline void is_dirty(const T & obj1, const T & obj2, QStringList & lstDiff);

template <class T>
struct QxDao_IsDirty_Generic
{

   static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
   {
      static_assert(qx::trait::is_qx_registered<T>::value, "qx::trait::is_qx_registered<T>::value");

      qx::QxSqlQueryBuilder_Count<T> builder; builder.init();
      qx::IxDataMember * pId = builder.getDataId();
      if (pId && (! pId->isEqual((& obj1), (& obj2)))) { lstDiff.append(pId->getKey()); }

      long l = 0;
      qx::IxDataMember * p = NULL;
      while ((p = builder.nextData(l)))
      { if (p && (! p->isEqual((& obj1), (& obj2)))) { lstDiff.append(p->getKey()); } }
   }

};

template <class T>
struct QxDao_IsDirty_Container
{

   static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
   {
      if (qx::trait::generic_container<T>::size(obj1) <= 0) { return; }
      if (qx::trait::generic_container<T>::size(obj1) != qx::trait::generic_container<T>::size(obj2)) { lstDiff.append("*"); return; }

      long lCurrIndex = 0;
      typename T::const_iterator it2 = obj2.begin();

      for (typename T::const_iterator it1 = obj1.begin(); it1 != obj1.end(); ++it1)
      {
         QStringList lstDiffItem;
         qx::dao::detail::is_dirty((* it1), (* it2), lstDiffItem);
         if (lstDiffItem.count() > 0) { lstDiff.append(QString::number(lCurrIndex) + "|" + lstDiffItem.join("|")); }
         ++lCurrIndex; ++it2;
      }
   }

};

template <class T>
struct QxDao_IsDirty_Ptr
{

   static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
   { qx::dao::detail::is_dirty((* obj1), (* obj2), lstDiff); }

};

template <class T>
struct QxDao_IsDirty
{

   static void compare(const T & obj1, const T & obj2, QStringList & lstDiff)
   {
      typedef typename std::conditional< std::is_pointer<T>::value, qx::dao::detail::QxDao_IsDirty_Ptr<T>, qx::dao::detail::QxDao_IsDirty_Generic<T> >::type type_dao_1;
      typedef typename std::conditional< qx::trait::is_smart_ptr<T>::value, qx::dao::detail::QxDao_IsDirty_Ptr<T>, type_dao_1 >::type type_dao_2;
      typedef typename std::conditional< qx::trait::is_container<T>::value, qx::dao::detail::QxDao_IsDirty_Container<T>, type_dao_2 >::type type_dao_3;
      type_dao_3::compare(obj1, obj2, lstDiff);
   }

};

template <class T>
inline void is_dirty(const T & obj1, const T & obj2, QStringList & lstDiff)
{ return qx::dao::detail::QxDao_IsDirty<T>::compare(obj1, obj2, lstDiff); }

} // namespace detail
} // namespace dao
} // namespace qx

#endif // _QX_DAO_IS_DIRTY_H_