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////////////////////////////////////////////////////////////////////////////////
/*! @file NodePtr.h A clever pointer to a node of RANet.
- Part of RANet - Research Assistant Net Library (based on ANSI C++).
- Copyright(C) 1994-2013, Viktor E. Bursian, St.Petersburg, Russia.
Viktor.Bursian@mail.ioffe.ru
*///////////////////////////////////////////////////////////////////////////////
#ifndef NodePtr_H
#define NodePtr_H
#include "NodeLocation.h"
#include <QMutex>
namespace RA {
//------------------------------------------------------------------------------
ANNOUNCE_CLASS(sNodePtr)
//template sPtr< node_class >
//----------------------------------------------------------------- sNodePtr ---
/*! Encapsulated pointer to a node.
It can point either to a node in memory or to a node stored in file.
Operators * and -> do what is expected for pointers.
However, if the pointer points to a stored node, the node will be
automatically loaded and the pointer transforms itself so that it
points now to the loaded copy of the node.
Also, there may be a case when a node can be accessed through
different branches of the net. In this case, ...
*/
class RANet_EXPORT sNodePtr
{
public:
virtual ~sNodePtr ();
sNodePtr ();
explicit sNodePtr (psNode);
sNodePtr (rcsNodePtr);
rsNodePtr operator = (rcsNodePtr);
bool IsNULL () const;
void SetToNULL ();
bool operator == (rcsNodePtr) const;
//!@todo{Net} добавить вариант, возвращающий pcsNode?
psNode operator -> ();
//!@todo{Net} изменить возвращаемый на rcsNode?
rsNode operator * ();
public:
sNodePtr operator >> (rcsAttrName attr_name);
sNodePtr operator >> (integer attr_name)
{return operator>>(sAttrName(attr_name));}
sNodePtr operator >> (rcsString attr_name)
{return operator>>(sAttrName(attr_name));}
sNodePtr operator >> (literal attr_name)
{return operator>>(sAttrName(attr_name));}
rsNodePtr operator << (sAttribute);
rsNodePtr operator << (sNodePtr value_of_a_nameless_attr);
sNodePtr operator >= (sAttribute);
sNodePtr operator >= (rcsAttrName attr_name);
sNodePtr operator >= (integer attr_name)
{
return operator>=(sAttrName(attr_name));
}
sNodePtr operator >= (rcsString attr_name)
{
return operator>=(sAttrName(attr_name));
}
sNodePtr operator >= (literal attr_name)
{
return operator>=(sAttrName(attr_name));
}
void operator |= (sAttribute);
void operator |= (rcsAttrName attr_name);
void operator |= (integer attr_name)
{ operator|=(sAttrName(attr_name));}
void operator |= (rcsString attr_name)
{ operator|=(sAttrName(attr_name));}
void operator |= (literal attr_name)
{ operator|=(sAttrName(attr_name));}
void DelAttr (sAttrName); //not Nameless
void DelAttr (integer attr_name)
{ DelAttr(sAttrName(attr_name)); }
void DelAttr (rcsString attr_name)
{ DelAttr(sAttrName(attr_name)); }
void DelAttr (literal attr_name)
{ DelAttr(sAttrName(attr_name)); }
void DelAttr (sNodePtr value_ptr);//Nameless only
void DeleteAllAttributes ();
// rsNodePtr operator |= (sNodePtr model);
pcsNodeLocation NodeLocation ();
bool NodeIsRecentlyEdited ()
{ return NodeIsRecentlyEditedFlag; }
void AcknowledgeThatNodeIsRecentlyEdited ()
{ NodeIsRecentlyEditedFlag=false; }
protected:
private:
explicit sNodePtr (psNodeLocation);
void Clear ();
void GetNode ();
private://fields
QMutex Mutex;
bool InMemory;
union{
psNode TheNodePtr; //if InMemory
psNodeLocation TheNodeLocationPtr; //if ! InMemory
};
bool NodeIsRecentlyEditedFlag;
#ifdef RANET_DEBUG
public:
static long int Counter;
#endif
friend class sNode;
friend class sAttribute;
// sNodePtr (rsObjectStream);
// virtual void Store (rsObjectStream);
// bool Strip (); //returns true if any of
// //unstripable nodes down the net
// //have to be saved (i.e. are Edited)
// void StripCareless ();
// bool Stripped () const
// /*! @todo{NetIO} NullNodePtr??? */
// { return ! InMemory; };
// void PurgeAttributes ();
// void Preallocate (sNodePtr Host
// ,sAttrName AN);
// protected:
// bool IsHosting () const
// { return Hosting; };
// private:
// void SetHostingFlag ()
// { Hosting=true; };
// void SetKeepFromSwitchingFlag()
// { KeepFromSwitching=true; };
// protected://fields
// private://fields
// bool Hosting;
// bool KeepFromSwitching;
// friend class sAttribute;
};
//--------------------------------------------------------- sPtr<node_class> ---
template <class node_class>
struct sPtr : public sNodePtr
{
sPtr ()
:sNodePtr()
{}
explicit sPtr (node_class * new_node)
:sNodePtr(new_node)
{ Check(); }
sPtr (rcsNodePtr other)
:sNodePtr(other)
{ Check(); }
sPtr (const sPtr & other)
:sNodePtr(other)
{ Check(); }
sPtr & operator = (const sPtr & other)
{
return (sPtr &)(sNodePtr::operator=(other));
}
sPtr & operator = (rcsNodePtr other)
{
return this->operator=(sPtr(other));
}
node_class * operator -> ()
{
return (node_class *)(sNodePtr::operator->());
}
node_class & operator * ()
{
return (node_class &)(sNodePtr::operator*());
}
bool IsCorrect () const
{ return ! IsNULL(); }
private:
void Check ()
{
if( ! IsNULL()
&& ! dynamic_cast< node_class * >
(sNodePtr::operator ->()) )
SetToNULL();
}
};
//------------------------------------------------------------------------------
} //namespace RA
#endif
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