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// File: TObj_Persistence.hxx
// Created: Tue Nov 23 11:36:03 2004
// Author: Pavel TELKOV
// Copyright: Open CASCADE 2007
// The original implementation Copyright: (C) RINA S.p.A
#ifndef TObj_Persistence_HeaderFile
#define TObj_Persistence_HeaderFile
#include <TObj_Container.hxx>
class TDF_Label;
class Handle(TObj_Object);
/** This class is intended to be a root of tools (one per class)
* to manage persistence of objects inherited from TObj_Object
* It provides a mechanism to recover correctly typed
* objects (subtypes of TObj_Object) out of their persistent names
*
* This is a special kind of object, it automatically registers itself
* in a global map when created, and the only thing it does is to
* create a new object of the type that it manages, by request
*/
class TObj_Persistence
{
public:
/**
* Public methods, to be called externally
*/
//! Creates and returns a new object of the registered type
//! If the type is not registered, returns Null handle
static Standard_EXPORT Handle(TObj_Object) CreateNewObject
(const Standard_CString theType,
const TDF_Label& theLabel);
//! Dumps names of all the types registered for persistence to the
//! specified stream
static Standard_EXPORT void DumpTypes (Standard_OStream& theOs);
protected:
/**
* Protected methods, to be used or defined by descendants
*/
//! The constructor registers the object
Standard_EXPORT TObj_Persistence (const Standard_CString theType);
//! The destructor unregisters the object
virtual Standard_EXPORT ~TObj_Persistence ();
//! The method must be redefined in the derived class and return
//! new object of the proper type
virtual Standard_EXPORT Handle(TObj_Object) New
(const TDF_Label& theLabel) const = 0;
//! Dictionary storing all the registered types. It is implemented as static
//! variable inside member function in order to ensure initialization
//! at first call
static Standard_EXPORT TObj_DataMapOfStringPointer& getMapOfTypes();
private:
Standard_CString myType; //!< Name of managed type (recorded for unregistering)
};
//! Declare subclass and methods of the class inherited from TObj_Object
//! necessary for implementation of persistence
//! This declaration should be put inside class declaration, under 'protected' modifier
#ifdef SOLARIS
//! Workaround on SUN to avoid stupid warnings
#define _TOBJOCAF_PERSISTENCE_ACCESS_ public:
#else
#define _TOBJOCAF_PERSISTENCE_ACCESS_
#endif
#define DECLARE_TOBJOCAF_PERSISTENCE(name,ancestor) \
name (const TObj_Persistence *p, \
const TDF_Label& aLabel) : ancestor(p,aLabel) \
{ initFields(); } /* give the object a chance to initialize its fields */ \
\
/* Creates an object of a proper type */ \
/* First argument is used just to avoid possible conflict with other constructors */ \
_TOBJOCAF_PERSISTENCE_ACCESS_ \
class Persistence_ : public TObj_Persistence { \
/* Friend private class of name, is a tool providing persistence */ \
public: \
Persistence_ () : TObj_Persistence(#name) {} /* register the tool */ \
virtual Handle(TObj_Object) New (const TDF_Label& aLabel) const; \
/* Creates an object of a proper type */ \
}; \
friend class Persistence_; \
static Persistence_ myPersistence_; /* Static field implementing persistsnce tool */
//! Implement mechanism for registration the type for persistence
//! This should not be used for abstract classes (while DECLARE should)
#define IMPLEMENT_TOBJOCAF_PERSISTENCE(name) \
name::Persistence_ name::myPersistence_; \
Handle(TObj_Object) name::Persistence_::New (const TDF_Label& aLabel) const { \
return new name((const TObj_Persistence*)0, aLabel); \
}
#endif
#ifdef _MSC_VER
#pragma once
#endif
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