QxSqlRelation.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_SQL_RELATION_H_
#define _QX_SQL_RELATION_H_

#ifdef _MSC_VER
#pragma once
#endif

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

#include <QxTraits/remove_attr.h>
#include <QxTraits/remove_smart_ptr.h>
#include <QxTraits/generic_container.h>
#include <QxTraits/is_container.h>
#include <QxTraits/is_valid_primary_key.h>
#include <QxTraits/is_qx_registered.h>

#include <QxRegister/IxClass.h>

namespace qx {

template <class T>
class QxClass;

template <class DataType, class Owner>
class QxSqlRelation : public IxSqlRelation
{

protected:

   typedef typename qx::trait::remove_attr<DataType>::type type_tmp_1;
   typedef typename qx::trait::remove_smart_ptr<type_tmp_1>::type type_tmp_2;
   typedef type_tmp_2 type_container;
   typedef qx::trait::generic_container<type_container> type_generic_container;
   typedef typename type_generic_container::type_item type_item;
   typedef typename std::conditional<qx::trait::is_container<type_container>::value, typename type_generic_container::type_value_qx, type_container>::type type_tmp_3;
   typedef typename QxSqlRelation<DataType, Owner>::type_tmp_3 type_data;
   typedef Owner type_owner;

   enum { is_valid = (qx::trait::is_qx_registered<type_data>::value && qx::trait::is_qx_registered<type_owner>::value) };
   enum { is_data_pointer = (std::is_pointer<DataType>::value || qx::trait::is_smart_ptr<DataType>::value) };
   enum { is_data_container = qx::trait::is_container<type_container>::value };
   enum { is_same_data_owner = std::is_same<type_data, type_owner>::value };

public:

   QxSqlRelation(IxDataMember * p) : IxSqlRelation(p) { this->setIsSameDataOwner(static_cast<int>(is_same_data_owner)); }
   virtual ~QxSqlRelation() { static_assert(is_valid, "is_valid"); }

   virtual void init()
   {
      if (! this->canInit()) { return; }
      this->setClass(QxClass<type_data>::getSingleton(), QxClass<type_owner>::getSingleton());
      IxSqlRelation::init();
   }

protected:

   DataType * getDataTypePtr(QxSqlRelationParams & params) const
   { qAssert(params.owner() && this->getDataMember()); return static_cast<DataType *>(this->getDataMember()->getValueVoidPtr(params.owner())); }

   type_owner & getOwner(QxSqlRelationParams & params) const
   { qAssert(params.owner()); return (* static_cast<type_owner *>(params.owner())); }

   type_data & getData(QxSqlRelationParams & params) const
   { return getData_Helper<is_data_pointer, is_data_container, 0>::get(getDataTypePtr(params)); }

   type_container & getContainer(QxSqlRelationParams & params) const
   { return getContainer_Helper<is_data_pointer, is_data_container, 0>::get(getDataTypePtr(params)); }

   type_item createItem() const
   { return createItem_Helper<is_data_container, 0>::get(); }

   bool isNullData(QxSqlRelationParams & params) const
   { return isNullData_Helper<is_data_pointer, 0>::get(getDataTypePtr(params)); }

   bool callTriggerBeforeFetch(type_data & t, QxSqlRelationParams & params) const
   {
      if (! params.builder().getDaoHelper()) { return true; }
      qx::dao::on_before_fetch<type_data>((& t), params.builder().getDaoHelper());
      return params.builder().getDaoHelper()->isValid();
   }

   bool callTriggerAfterFetch(type_data & t, QxSqlRelationParams & params) const
   {
      if (! params.builder().getDaoHelper()) { return true; }
      qx::dao::on_after_fetch<type_data>((& t), params.builder().getDaoHelper());
      return params.builder().getDaoHelper()->isValid();
   }

private:

   template <bool bIsPointer /* = false */, bool bIsContainer /* = false */, int dummy>
   struct getData_Helper
   { static type_data & get(DataType * t) { return (* t); } };

   template <int dummy>
   struct getData_Helper<true, false, dummy>
   { static type_data & get(DataType * t) { if (! (* t)) { qx::trait::construct_ptr<DataType>::get(* t); }; return (** t); } };

   template <int dummy>
   struct getData_Helper<false, true, dummy>
   { static type_data & get(DataType * t) { qAssert(false); Q_UNUSED(t); type_data * pDummy(NULL); return (* pDummy); } };

   template <int dummy>
   struct getData_Helper<true, true, dummy>
   { static type_data & get(DataType * t) { qAssert(false); Q_UNUSED(t); type_data * pDummy(NULL); return (* pDummy); } };

   template <bool bIsPointer /* = false */, bool bIsContainer /* = false */, int dummy>
   struct getContainer_Helper
   { static type_container & get(DataType * t) { qAssert(false); Q_UNUSED(t); type_container * pDummy(NULL); return (* pDummy); } };

   template <int dummy>
   struct getContainer_Helper<true, false, dummy>
   { static type_container & get(DataType * t) { qAssert(false); Q_UNUSED(t); type_container * pDummy(NULL); return (* pDummy); } };

   template <int dummy>
   struct getContainer_Helper<false, true, dummy>
   { static type_container & get(DataType * t) { return (* t); } };

   template <int dummy>
   struct getContainer_Helper<true, true, dummy>
   { static type_container & get(DataType * t) { if (! (* t)) { qx::trait::construct_ptr<DataType>::get(* t); }; return (** t); } };

   template <bool bIsContainer /* = false */, int dummy>
   struct createItem_Helper
   { static type_item get() { qAssert(false); type_item * pDummy(NULL); return (* pDummy); } };

   template <int dummy>
   struct createItem_Helper<true, dummy>
   { static type_item get() { return type_generic_container::createItem(); } };

   template <bool bIsPointer /* = false */, int dummy>
   struct isNullData_Helper
   { static bool get(DataType * t) { Q_UNUSED(t); return false; } };

   template <int dummy>
   struct isNullData_Helper<true, dummy>
   { static bool get(DataType * t) { return ((! (* t)) ? true : false); } };

};

} // namespace qx

#include <QxDao/QxSqlRelation_OneToOne.h>
#include <QxDao/QxSqlRelation_OneToMany.h>
#include <QxDao/QxSqlRelation_ManyToOne.h>
#include <QxDao/QxSqlRelation_ManyToMany.h>
#include <QxDao/QxSqlRelation_RawData.h>

#endif // _QX_SQL_RELATION_H_