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// File: TDF_LabelNode.cxx
// ------------------
// Author: DAUTRY Philippe
// <fid@fox.paris1.matra-dtv.fr>
// Copyright: Matra Datavision 1997
// Version: 0.0
// History: Version Date Purpose
// 0.0 Feb 6 1997 Creation
// MSV 21.03.2003: protect against stack overflow in destructor
#include <TDF_LabelNode.hxx>
#include <TDF_Data.hxx>
#include <TDF_Label.hxx>
//=======================================================================
//function : TDF_LabelNode
//purpose : Constructor with TDF_Data*, only used for root node.
//=======================================================================
TDF_LabelNode::TDF_LabelNode
(TDF_Data* aDataPtr)
: myFather (NULL), // The sign it is the root.
#ifdef KEEP_LOCAL_ROOT
myBrother (NULL),
#else
myBrother ((TDF_LabelNode *)aDataPtr),
#endif
myFirstChild (NULL),
myLastFoundChild (NULL), //jfa 10.01.2003
myTag (0), // Always 0 for root.
myFlags (0),
#ifdef KEEP_LOCAL_ROOT
myData (aDataPtr)
#endif
{
#ifdef DEB
myDebugEntry = '0';
#endif
}
//=======================================================================
//function : TDF_LabelNode
//purpose : Constructor
//=======================================================================
TDF_LabelNode::TDF_LabelNode
(const Standard_Integer aTag, TDF_LabelNode* aFather)
: myFather (aFather),
myBrother (NULL),
myFirstChild (NULL),
myLastFoundChild (NULL), //jfa 10.01.2003
myTag (aTag),
myFlags (0),
#ifdef KEEP_LOCAL_ROOT
myData (NULL)
#endif
{
if (aFather != NULL) {
Depth(aFather->Depth() + 1);
#ifdef KEEP_LOCAL_ROOT
myData = aFather -> Data();
#endif
}
#ifdef DEB
myDebugEntry = myFather->myDebugEntry;
myDebugEntry += ':';
myDebugEntry += aTag;
#endif
}
//=======================================================================
//function : ~TDF_LabelNode
//purpose :
//=======================================================================
TDF_LabelNode::~TDF_LabelNode()
{
// MSV 21.03.2003: do not delete brother, rather delete all children in a loop
// to avoid stack overflow
while (myFirstChild != NULL) {
TDF_LabelNode* aSecondChild = myFirstChild->Brother();
delete myFirstChild;
myFirstChild = aSecondChild;
}
myFirstAttribute.Nullify();
myLastFoundChild = NULL; //jfa 10.01.2003
}
//=======================================================================
//function : AddAttribute
//purpose : Adds an attribute at the first or the specified position.
//=======================================================================
void TDF_LabelNode::AddAttribute
(const Handle(TDF_Attribute)& afterAtt,
const Handle(TDF_Attribute)& newAtt)
{
newAtt->myFlags = 1; // Valid.
newAtt->myLabelNode = this;
if (afterAtt.IsNull()) { // Inserts at beginning.
newAtt->myNext = myFirstAttribute;
myFirstAttribute = newAtt;
}
else { // Inserts at specified place.
newAtt->myNext = afterAtt->myNext;
afterAtt->myNext = newAtt;
}
}
//=======================================================================
//function : RemoveAttribute
//purpose : Removes an attribute from the first or the specified position.
//=======================================================================
void TDF_LabelNode::RemoveAttribute
(const Handle(TDF_Attribute)& afterAtt,
const Handle(TDF_Attribute)& oldAtt)
{
oldAtt->myFlags = 0; // Unvalid.
oldAtt->myLabelNode = NULL;
if (afterAtt.IsNull()) { // Removes from beginning.
myFirstAttribute = oldAtt->myNext;
}
else { // Removes from specified place.
afterAtt->myNext = oldAtt->myNext;
}
// Nullifier le next induit l'iterateur d'attribut en erreur.
//oldAtt->myNext.Nullify();
}
//=======================================================================
//function : RootNode
//purpose : used for non const object.
//=======================================================================
TDF_LabelNode* TDF_LabelNode::RootNode ()
{
#ifdef KEEP_LOCAL_ROOT
return myData? myData -> myRoot: 0L;
#else
TDF_LabelNode* lp = this;
while (lp->myFather != NULL) lp = lp->myFather;
return lp;
#endif
}
//=======================================================================
//function : RootNode
//purpose : used for const object.
//=======================================================================
const TDF_LabelNode* TDF_LabelNode::RootNode () const
{
#ifdef KEEP_LOCAL_ROOT
return myData? myData -> myRoot: 0L;
#else
const TDF_LabelNode* lp = this;
while (lp->myFather != NULL) lp = lp->myFather;
return lp;
#endif
}
//=======================================================================
//function : Data
//purpose :
//=======================================================================
TDF_Data * TDF_LabelNode::Data () const
{
#ifdef KEEP_LOCAL_ROOT
return myData;
#else
const TDF_LabelNode* ln = RootNode()->myBrother;
return ((TDF_Data*) ln);
#endif
}
//=======================================================================
//function : AllMayBeModified
//purpose :
//=======================================================================
void TDF_LabelNode::AllMayBeModified()
{
MayBeModified(Standard_True);
if (myFather && !myFather->MayBeModified()) myFather->AllMayBeModified();
}
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