/****************************************************************************
**
** http://www.qxorm.com/
** http://sourceforge.net/projects/qxorm/
** Original file by Lionel Marty
**
** This file is part of the QxOrm library
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any
** damages arising from the use of this software.
**
** GNU Lesser General Public License Usage
** This file must be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file 'license.lgpl.txt' included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you have questions regarding the use of this file, please contact :
** contact@qxorm.com
**
****************************************************************************/
#ifndef _QX_DAO_POINTER_H_
#define _QX_DAO_POINTER_H_
#ifdef _MSC_VER
#pragma once
#endif
/*!
* \file QxDaoPointer.h
* \author Lionel Marty
* \ingroup QxDao
* \brief qx::dao::ptr<T> : provide a classic smart-pointer (like boost::shared_ptr<T> or QSharedPointer<T>) with some features associated with QxDao module of QxOrm library
*/
#include <QtCore/qsharedpointer.h>
#include <QtCore/qstringlist.h>
namespace qx {
namespace dao {
namespace detail {
template <class T> struct QxDao_IsDirty;
} // namespace detail
/*!
* \ingroup QxDao
* \brief qx::dao::ptr<T> : provide a classic smart-pointer (like boost::shared_ptr<T> or QSharedPointer<T>) with some features associated with QxDao module of QxOrm library
*
* QxOrm can be used with smart-pointers of boost and Qt libraries.
* QxOrm smart-pointer is based on QSharedPointer and provides new features with qx::dao::xxx functions of QxDao module.
* qx::dao::ptr<T> keeps automatically values from database.
* So it's possible to detect if an instance has been modified using the method isDirty() : this method can return list of properties changed.
* qx::dao::ptr<T> can also be used with the function qx::dao::update_optimized() to update in database only properties changed.
* qx::dao::ptr<T> can be used with a simple object and with many containers : stl, boost, Qt and qx::QxCollection<Key, Value>.
*
* Quick sample using qx::dao::ptr<T> smart-pointer :
* \code
// Test 'isDirty()' method
qx::dao::ptr<blog> blog_isdirty = qx::dao::ptr<blog>(new blog());
blog_isdirty->m_id = blog_1->m_id;
daoError = qx::dao::fetch_by_id(blog_isdirty);
qAssert(! daoError.isValid() && ! blog_isdirty.isDirty());
blog_isdirty->m_text = "blog property 'text' modified => blog is dirty !!!";
QStringList lstDiff; bool bDirty = blog_isdirty.isDirty(lstDiff);
qAssert(bDirty && (lstDiff.count() == 1) && (lstDiff.at(0) == "blog_text"));
if (bDirty) { qDebug("[QxOrm] test dirty 1 : blog is dirty => '%s'", qPrintable(lstDiff.join("|"))); }
// Update only property 'm_text' of 'blog_isdirty'
daoError = qx::dao::update_optimized(blog_isdirty);
qAssert(! daoError.isValid() && ! blog_isdirty.isDirty());
qx::dump(blog_isdirty);
// Test 'isDirty()' method with a container
typedef qx::dao::ptr< QList<author_ptr> > type_lst_author_test_is_dirty;
type_lst_author_test_is_dirty container_isdirty = type_lst_author_test_is_dirty(new QList<author_ptr>());
daoError = qx::dao::fetch_all(container_isdirty);
qAssert(! daoError.isValid() && ! container_isdirty.isDirty() && (container_isdirty->count() == 3));
author_ptr author_ptr_dirty = container_isdirty->at(1);
author_ptr_dirty->m_name = "author name modified at index 1 => container is dirty !!!";
bDirty = container_isdirty.isDirty(lstDiff);
qAssert(bDirty && (lstDiff.count() == 1));
if (bDirty) { qDebug("[QxOrm] test dirty 2 : container is dirty => '%s'", qPrintable(lstDiff.join("|"))); }
author_ptr_dirty = container_isdirty->at(2);
author_ptr_dirty->m_birthdate = QDate(1998, 03, 06);
bDirty = container_isdirty.isDirty(lstDiff);
qAssert(bDirty && (lstDiff.count() == 2));
if (bDirty) { qDebug("[QxOrm] test dirty 3 : container is dirty => '%s'", qPrintable(lstDiff.join("|"))); }
// Update only property 'm_name' at position 1, only property 'm_birthdate' at position 2 and nothing at position 0
daoError = qx::dao::update_optimized(container_isdirty);
qAssert(! daoError.isValid() && ! container_isdirty.isDirty());
qx::dump(container_isdirty);
// Fetch only property 'm_dt_creation' of blog
QStringList lstColumns = QStringList() << "date_creation";
list_blog lst_blog_with_only_date_creation;
daoError = qx::dao::fetch_all(lst_blog_with_only_date_creation, NULL, lstColumns);
qAssert(! daoError.isValid() && (lst_blog_with_only_date_creation.size() > 0));
if ((lst_blog_with_only_date_creation.size() > 0) && (lst_blog_with_only_date_creation[0] != NULL))
{ qAssert(lst_blog_with_only_date_creation[0]->m_text.isEmpty()); }
qx::dump(lst_blog_with_only_date_creation);
* \endcode
*/
template <typename T>
class ptr
{
private:
QSharedPointer<T> m_pWork; //!< Default pointer => user works with this pointer
QSharedPointer<T> m_pOriginal; //!< Keep original pointer containing all values from database
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; }
template <class X> qx::dao::ptr<X> staticCast() const { return qx::dao::ptr<X>(m_pWork.staticCast<X>(), m_pOriginal.staticCast<X>()); }
template <class X> qx::dao::ptr<X> dynamicCast() const { return qx::dao::ptr<X>(m_pWork.dynamicCast<X>(), m_pOriginal.dynamicCast<X>()); }
template <class X> qx::dao::ptr<X> constCast() const { return qx::dao::ptr<X>(m_pWork.constCast<X>(), m_pOriginal.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()); }
#endif // _QX_DAO_POINTER_H_
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