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0030773: Application Framework - To allow to inherit existing attributes to reuse persistence mechanisms

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Added possibility to inherit existing attributes if the same persistent fields are used. All methods that allow controlling the data model changes or getting some callbacks may be overridden in successor. They may have same GUIDs as a base class or new ones.

Special macros IMPLEMENT_DERIVED_ATTRIBUTE and IMPLEMENT_DERIVED_ATTRIBUTE_WITH_TYPE must be used instead of standard Handle macro definition IMPLEMENT_STANDARD_RTTIEXT to register new derived attributes.

Using this improvement several existing attributes from TDataStd, TDataXtd and XCAFDoc packages become inherited from other base attribute-classes. XML and Bin drivers of these attributes are removed. New base attribute classes are added: TDataStd_GenericEmpty and TDataStd_GenericExtString.

This improvement does not change both present formats Bin and XML documents. The obsolete Standard scheme is not changed at all.
This commit is contained in:
mpv
2020-06-19 23:12:17 +03:00
committed by abv
parent 59e11a2f75
commit c99ad5d760
202 changed files with 1438 additions and 8261 deletions
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22
src/XmlMDF/XmlMDF_ADriverTable.hxx
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@@ -23,6 +23,7 @@
#include <Standard_Transient.hxx>
#include <Standard_Boolean.hxx>
#include <Standard_Type.hxx>
#include <XmlMDF_MapOfDriver.hxx>
class XmlMDF_ADriver;
@@ -45,16 +46,23 @@ public:
//! Sets a translation driver: <aDriver>.
Standard_EXPORT void AddDriver (const Handle(XmlMDF_ADriver)& anHDriver);
//! Gets a map of drivers.
Standard_EXPORT const XmlMDF_TypeADriverMap& GetDrivers() const;
//! Adds a translation driver for the derived attribute. The base driver must be already added.
//! @param theInstance is newly created attribute, detached from any label
Standard_EXPORT void AddDerivedDriver (const Handle(TDF_Attribute)& theInstance);
//! Adds a translation driver for the derived attribute. The base driver must be already added.
//! @param theDerivedType is registered attribute type using IMPLEMENT_DERIVED_ATTRIBUTE macro
Standard_EXPORT const Handle(Standard_Type)& AddDerivedDriver (Standard_CString theDerivedType);
//! Fills the map by all registered drivers.
Standard_EXPORT void CreateDrvMap (XmlMDF_MapOfDriver& theDriverMap);
//! Gets a driver <aDriver> according to <aType>
//!
//! Returns True if a driver is found; false otherwise.
Standard_EXPORT Standard_Boolean GetDriver (const Handle(Standard_Type)& aType, Handle(XmlMDF_ADriver)& anHDriver) const;
Standard_EXPORT Standard_Boolean GetDriver (const Handle(Standard_Type)& theType,
Handle(XmlMDF_ADriver)& theDriver);
DEFINE_STANDARD_RTTIEXT(XmlMDF_ADriverTable,Standard_Transient)