QxDaoPointer.h

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/****************************************************************************
**
** https://www.qxorm.com/
** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
**
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** Foundation and appearing in the file 'license.gpl3.txt' included in the
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#ifndef _QX_DAO_POINTER_H_
#define _QX_DAO_POINTER_H_

#ifdef _MSC_VER
#pragma once
#endif

#include <QtCore/qsharedpointer.h>
#include <QtCore/qstringlist.h>
#include <QtCore/qdatastream.h>

#include <QxSerialize/QDataStream/QxSerializeQDataStream_QSharedPointer.h>

namespace qx {
template <class T> QSharedPointer<T> clone_to_qt_shared_ptr(const T & obj);
} // namespace qx

namespace qx {
namespace dao {
template <typename T> class ptr;
} // namespace dao
} // namespace qx

template <typename T> QDataStream & operator<< (QDataStream & stream, const qx::dao::ptr<T> & t);
template <typename T> QDataStream & operator>> (QDataStream & stream, qx::dao::ptr<T> & t);

namespace qx {
namespace dao {

namespace detail {
template <class T> struct QxDao_IsDirty;
} // namespace detail

template <typename T>
class ptr
{

   template <class U> friend QDataStream & ::operator<< (QDataStream & stream, const qx::dao::ptr<U> & t);
   template <class U> friend QDataStream & ::operator>> (QDataStream & stream, qx::dao::ptr<U> & t);

private:

   QSharedPointer<T> m_pWork;       
   QSharedPointer<T> m_pOriginal;   

public:

   ptr()                                                                                                             { ; }
   explicit ptr(T * ptr) : m_pWork(ptr)                                                                              { ; }
   explicit ptr(T * ptr, T * original) : m_pWork(ptr), m_pOriginal(original)                                         { ; }
   ptr(const qx::dao::ptr<T> & other) : m_pWork(other.m_pWork), m_pOriginal(other.m_pOriginal)                       { ; }
   ptr(const QSharedPointer<T> & other) : m_pWork(other)                                                             { ; }
   ptr(const QSharedPointer<T> & other, const QSharedPointer<T> & original) : m_pWork(other), m_pOriginal(original)  { ; }
   ptr(const QWeakPointer<T> & other) : m_pWork(other)                                                               { ; }
   ptr(const QWeakPointer<T> & other, const QWeakPointer<T> & original) : m_pWork(other), m_pOriginal(original)      { ; }
   virtual ~ptr()                                                                                                    { ; }

   template <typename Deleter> ptr(T * ptr, Deleter deleter) : m_pWork(ptr, deleter)                                       { ; }
   template <typename Deleter> ptr(T * ptr, T * original, Deleter deleter) : m_pWork(ptr, deleter), m_pOriginal(original)  { ; }

   template <class X> ptr(const qx::dao::ptr<X> & other) : m_pWork(qSharedPointerCast<T>(other.m_pWork)), m_pOriginal(qSharedPointerCast<T>(other.m_pOriginal))                                                { ; }
   template <class X> ptr(const QSharedPointer<X> & other) : m_pWork(qSharedPointerCast<T>(other))                                                                                                             { ; }
   template <class X> ptr(const QSharedPointer<X> & other, const QSharedPointer<T> & original) : m_pWork(qSharedPointerCast<T>(other)), m_pOriginal(qSharedPointerCast<T>(original))                           { ; }
   template <class X> ptr(const QWeakPointer<X> & other) : m_pWork(qSharedPointerCast<T>(other.toStrongRef()))                                                                                                 { ; }
   template <class X> ptr(const QWeakPointer<X> & other, const QWeakPointer<X> & original) : m_pWork(qSharedPointerCast<T>(other.toStrongRef())), m_pOriginal(qSharedPointerCast<T>(original.toStrongRef()))   { ; }

   qx::dao::ptr<T> & operator=(const qx::dao::ptr<T> & other)     { m_pWork = other.m_pWork; m_pOriginal = other.m_pOriginal; return (* this); }
   qx::dao::ptr<T> & operator=(const QSharedPointer<T> & other)   { m_pWork = other; m_pOriginal.clear(); return (* this); }
   qx::dao::ptr<T> & operator=(const QWeakPointer<T> & other)     { m_pWork = other; m_pOriginal.clear(); return (* this); }

   template <class X> qx::dao::ptr<T> & operator=(const qx::dao::ptr<X> & other)    { m_pWork = qSharedPointerCast<T>(other.m_pWork); m_pOriginal = qSharedPointerCast<T>(other.m_pOriginal); return (* this); }
   template <class X> qx::dao::ptr<T> & operator=(const QSharedPointer<X> & other)  { m_pWork = qSharedPointerCast<T>(other); m_pOriginal.clear(); return (* this); }
   template <class X> qx::dao::ptr<T> & operator=(const QWeakPointer<X> & other)    { m_pWork = qSharedPointerCast<T>(other.toStrongRef()); m_pOriginal.clear(); return (* this); }

   inline T * get() const                                      { return m_pWork.data(); }
   inline T * getOriginal() const                              { return m_pOriginal.data(); }
   inline T * data() const                                     { return m_pWork.data(); }
   inline T * dataOriginal() const                             { return m_pOriginal.data(); }
   inline bool isNull() const                                  { return m_pWork.isNull(); }
   inline operator bool() const                                { return (! m_pWork.isNull()); }
   inline bool operator!() const                               { return m_pWork.isNull(); }
   inline T & operator*() const                                { return (* m_pWork.data()); }
   inline T * operator->() const                               { return m_pWork.data(); }
   inline void clear()                                         { m_pWork.clear(); m_pOriginal.clear(); }
   inline void reset()                                         { m_pWork.clear(); m_pOriginal.clear(); }
   inline void reset(const QSharedPointer<T> & ptr)            { m_pWork = ptr; m_pOriginal.clear(); }
   inline void resetOriginal(const QSharedPointer<T> & ptr)    { m_pOriginal = ptr; }
   inline bool isDirty() const                                 { QStringList lstDiff; return isDirty(lstDiff); }
   inline QSharedPointer<T> toQtSharedPointer() const          { return m_pWork; }
   inline void saveToOriginal()                                { m_pOriginal.clear(); if (m_pWork) { m_pOriginal = qx::clone_to_qt_shared_ptr(* m_pWork); } }
   inline void restoreFromOriginal()                           { m_pWork.clear(); if (m_pOriginal) { m_pWork = qx::clone_to_qt_shared_ptr(* m_pOriginal); } }

   template <class X> qx::dao::ptr<X> staticCast() const       { return qx::dao::ptr<X>(m_pWork.template staticCast<X>(), m_pOriginal.template staticCast<X>()); }
   template <class X> qx::dao::ptr<X> dynamicCast() const      { return qx::dao::ptr<X>(m_pWork.template dynamicCast<X>(), m_pOriginal.template dynamicCast<X>()); }
   template <class X> qx::dao::ptr<X> constCast() const        { return qx::dao::ptr<X>(m_pWork.template constCast<X>(), m_pOriginal.template constCast<X>()); }

   bool isDirty(QStringList & lstDiff) const
   {
      lstDiff.clear();
      if (m_pWork.isNull() || m_pOriginal.isNull()) { lstDiff.append("*"); return true; }
      if (m_pWork == m_pOriginal) { return false; }
      qx::dao::detail::QxDao_IsDirty<T>::compare((* m_pWork), (* m_pOriginal), lstDiff);
      return (! lstDiff.isEmpty());
   }

};

} // namespace dao
} // namespace qx

template<class T, class X> bool operator==(const qx::dao::ptr<T> & ptr1, const qx::dao::ptr<X> & ptr2)   { return (ptr1.toQtSharedPointer() == ptr2.toQtSharedPointer()); }
template<class T, class X> bool operator!=(const qx::dao::ptr<T> & ptr1, const qx::dao::ptr<X> & ptr2)   { return (ptr1.toQtSharedPointer() != ptr2.toQtSharedPointer()); }
template<class T, class X> bool operator==(const qx::dao::ptr<T> & ptr1, const X * ptr2)                 { return (ptr1.toQtSharedPointer() == ptr2); }
template<class T, class X> bool operator!=(const qx::dao::ptr<T> & ptr1, const X * ptr2)                 { return (ptr1.toQtSharedPointer() != ptr2); }
template<class T, class X> bool operator==(const T * ptr1, const qx::dao::ptr<X> & ptr2)                 { return (ptr1 == ptr2.toQtSharedPointer()); }
template<class T, class X> bool operator!=(const T * ptr1, const qx::dao::ptr<X> & ptr2)                 { return (ptr1 != ptr2.toQtSharedPointer()); }

template <typename T>
QDataStream & operator<< (QDataStream & stream, const qx::dao::ptr<T> & t)
{
   stream << t.m_pWork;
   stream << t.m_pOriginal;
   return stream;
}

template <typename T>
QDataStream & operator>> (QDataStream & stream, qx::dao::ptr<T> & t)
{
   stream >> t.m_pWork;
   stream >> t.m_pOriginal;
   return stream;
}

#endif // _QX_DAO_POINTER_H_