0021208: Performance issue when loading SMESH with an hdf file containing a big mesh

+  virtual bool IsMeshInfoCorrect();

+  SMESH_PreMeshInfo* _preMeshInfo; // mesh info before full loading from study file

src/SMESH_I/SMESH_Group_i.cxx

@@ -37,6 +37,7 @@
 #include "SMESH_Group.hxx"
 #include "SMESH_Mesh_i.hxx"
 #include "SMESH_PythonDump.hxx"
+#include "SMESH_PreMeshInfo.hxx"
 
 #include CORBA_SERVER_HEADER(SMESH_Filter)
 
@@ -57,7 +58,8 @@ SMESH_GroupBase_i::SMESH_GroupBase_i( PortableServer::POA_ptr thePOA,
   myMeshServant( theMeshServant ), 
   myLocalID( theLocalID ),
   myNbNodes(-1),
-  myGroupDSTic(0)
+  myGroupDSTic(0),
+  myPreMeshInfo(NULL)
 {
   // PAL7962: san -- To ensure correct mapping of servant and correct reference counting in GenericObj_i,
   // servant activation is performed by SMESH_Mesh_i::createGroup()
@@ -102,6 +104,8 @@ SMESH_GroupBase_i::~SMESH_GroupBase_i()
   MESSAGE("~SMESH_GroupBase_i; this = "<<this );
   if ( myMeshServant )
     myMeshServant->removeGroup(myLocalID);
+
+  if ( myPreMeshInfo ) delete myPreMeshInfo; myPreMeshInfo = NULL;
 }
 
 //=======================================================================
@@ -209,6 +213,9 @@ SMESH::ElementType SMESH_GroupBase_i::GetType()
 
 CORBA::Long SMESH_GroupBase_i::Size()
 {
+  if ( myPreMeshInfo )
+    return GetType() == SMESH::NODE ? myPreMeshInfo->NbNodes() : myPreMeshInfo->NbElements();
+
   SMESHDS_GroupBase* aGroupDS = GetGroupDS();
   if (aGroupDS)
     return aGroupDS->Extent();
@@ -224,6 +231,9 @@ CORBA::Long SMESH_GroupBase_i::Size()
 
 CORBA::Boolean SMESH_GroupBase_i::IsEmpty()
 {
+  if ( myPreMeshInfo )
+    return Size() == 0;
+
   SMESHDS_GroupBase* aGroupDS = GetGroupDS();
   if (aGroupDS)
     return aGroupDS->IsEmpty();
@@ -239,6 +249,9 @@ CORBA::Boolean SMESH_GroupBase_i::IsEmpty()
 
 void SMESH_Group_i::Clear()
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   // Update Python script
   TPythonDump() << _this() << ".Clear()";
 
@@ -259,6 +272,9 @@ void SMESH_Group_i::Clear()
 
 CORBA::Boolean SMESH_GroupBase_i::Contains( CORBA::Long theID )
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   SMESHDS_GroupBase* aGroupDS = GetGroupDS();
   if (aGroupDS)
     return aGroupDS->Contains(theID);
@@ -274,6 +290,9 @@ CORBA::Boolean SMESH_GroupBase_i::Contains( CORBA::Long theID )
 
 CORBA::Long SMESH_Group_i::Add( const SMESH::long_array& theIDs )
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   // Update Python script
   TPythonDump() << "nbAdd = " << _this() << ".Add( " << theIDs << " )";
 
@@ -300,6 +319,9 @@ CORBA::Long SMESH_Group_i::Add( const SMESH::long_array& theIDs )
 
 CORBA::Long SMESH_Group_i::Remove( const SMESH::long_array& theIDs )
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   // Update Python script
   TPythonDump() << "nbDel = " << _this() << ".Remove( " << theIDs << " )";
 
@@ -328,8 +350,8 @@ typedef bool (SMESHDS_Group::*TFunChangeGroup)(const int);
 
 CORBA::Long 
 ChangeByPredicate( SMESH::Predicate_i* thePredicate,
-                   SMESHDS_GroupBase* theGroupBase,
+                   SMESHDS_GroupBase*  theGroupBase,
-                   TFunChangeGroup theFun)
+                   TFunChangeGroup     theFun)
 {
   CORBA::Long aNb = 0;
   if(SMESHDS_Group* aGroupDS = dynamic_cast<SMESHDS_Group*>(theGroupBase)){
@@ -350,6 +372,9 @@ CORBA::Long
 SMESH_Group_i::
 AddByPredicate( SMESH::Predicate_ptr thePredicate )
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   if(SMESH::Predicate_i* aPredicate = SMESH::GetPredicate(thePredicate)){
     TPythonDump()<<_this()<<".AddByPredicate("<<aPredicate<<")";
     return ChangeByPredicate(aPredicate,GetGroupDS(),&SMESHDS_Group::Add);
@@ -361,6 +386,9 @@ CORBA::Long
 SMESH_Group_i::
 RemoveByPredicate( SMESH::Predicate_ptr thePredicate )
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   if(SMESH::Predicate_i* aPredicate = SMESH::GetPredicate(thePredicate)){
     TPythonDump()<<_this()<<".RemoveByPredicate("<<aPredicate<<")";
     return ChangeByPredicate(aPredicate,GetGroupDS(),&SMESHDS_Group::Remove);
@@ -370,6 +398,9 @@ RemoveByPredicate( SMESH::Predicate_ptr thePredicate )
 
 CORBA::Long SMESH_Group_i::AddFrom( SMESH::SMESH_IDSource_ptr theSource )
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   TPythonDump pd;
   long nbAdd = 0;
   SMESHDS_Group* aGroupDS = dynamic_cast<SMESHDS_Group*>( GetGroupDS() );
@@ -410,6 +441,9 @@ CORBA::Long SMESH_Group_i::AddFrom( SMESH::SMESH_IDSource_ptr theSource )
 
 CORBA::Long SMESH_GroupBase_i::GetID( CORBA::Long theIndex )
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   SMESHDS_GroupBase* aGroupDS = GetGroupDS();
   if (aGroupDS)
     return aGroupDS->GetID(theIndex);
@@ -425,6 +459,9 @@ CORBA::Long SMESH_GroupBase_i::GetID( CORBA::Long theIndex )
 
 SMESH::long_array* SMESH_GroupBase_i::GetListOfID()
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   SMESH::long_array_var aRes = new SMESH::long_array();
   SMESHDS_GroupBase* aGroupDS = GetGroupDS();
   if (aGroupDS) {
@@ -468,6 +505,9 @@ CORBA::Long SMESH_GroupBase_i::GetNumberOfNodes()
   if ( GetType() == SMESH::NODE )
     return Size();
 
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   if ( SMESHDS_GroupBase* g = GetGroupDS())
   {
     if ( myNbNodes < 0 || g->GetTic() != myGroupDSTic )
@@ -491,6 +531,8 @@ CORBA::Boolean SMESH_GroupBase_i::IsNodeInfoAvailable()
 {
   if ( GetType() == SMESH::NODE/* || Size() < 100000 */)
     return true;
+  if ( myPreMeshInfo )
+    return false;
   if ( SMESHDS_GroupBase* g = GetGroupDS())
     return ( myNbNodes > -1 && g->GetTic() == myGroupDSTic);
   return false;
@@ -507,6 +549,9 @@ SMESH::long_array* SMESH_GroupBase_i::GetNodeIDs()
   if ( GetType() == SMESH::NODE )
     return GetListOfID();
 
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   SMESH::long_array_var aRes = new SMESH::long_array();
   if ( SMESHDS_GroupBase* g = GetGroupDS())
   {
@@ -631,32 +676,22 @@ void SMESH_GroupBase_i::SetColorNumber(CORBA::Long color)
 //=============================================================================
 SMESH::long_array* SMESH_GroupBase_i::GetMeshInfo()
 {
+  if ( myPreMeshInfo )
+    return myPreMeshInfo->GetMeshInfo();
+
   SMESH::long_array_var aRes = new SMESH::long_array();
   aRes->length(SMESH::Entity_Last);
   for (int i = SMESH::Entity_Node; i < SMESH::Entity_Last; i++)
     aRes[i] = 0;
 
-  SMESHDS_GroupBase* aGrpDS = GetGroupDS();
+  if ( SMESHDS_GroupBase* g = GetGroupDS())
-  if ( !aGrpDS )
+  {
-    return aRes._retn();
+    if ( g->GetType() == SMDSAbs_Node || ( myNbNodes > -1 && g->GetTic() == myGroupDSTic))
-  if ( GetType() == NODE )
+      aRes[ SMDSEntity_Node ] = GetNumberOfNodes();
-    aRes[ SMESH::Entity_Node ] = aGrpDS->Extent();
-  else
-    SMESH_Mesh_i::CollectMeshInfo( aGrpDS->GetElements(), aRes);
 
-//   SMDS_ElemIteratorPtr it = aGrpDS->GetElements();
+    if ( g->GetType() != SMDSAbs_Node )
-//   if ( it->more() )
+      SMESH_Mesh_i::CollectMeshInfo( g->GetElements(), aRes);
-//   {
+  }
-//     cout << "START" << endl;
-//     set< const SMDS_MeshElement* > nodes;
-//     const SMDS_MeshElement* e = it->next();
-//     for ( int i = 0; i < 1000000; ++i)
-//     {
-//       SMDS_ElemIteratorPtr it = e->nodesIterator();
-//       nodes.insert( e + i );
-//     }
-//     cout << "END "<< nodes.size() << endl;
-//   }
 
   return aRes._retn();
 }
@@ -668,8 +703,7 @@ SMESH::long_array* SMESH_GroupBase_i::GetMeshInfo()
 
 SMESH::long_array* SMESH_GroupBase_i::GetIDs()
 {
-  SMESH::long_array_var aResult = GetListOfID();
+  return GetListOfID();
-  return aResult._retn();
 }
 
 //=======================================================================
@@ -680,15 +714,25 @@ SMESH::long_array* SMESH_GroupBase_i::GetIDs()
 SMESH::array_of_ElementType* SMESH_GroupBase_i::GetTypes()
 {
   SMESH::array_of_ElementType_var types = new SMESH::array_of_ElementType;
-  if ( SMESHDS_GroupBase* ds = GetGroupDS() )
+  if ( !IsEmpty() )
-    if ( !ds->IsEmpty() )
+  {
-    {
+    types->length( 1 );
-      types->length( 1 );
+    types[0] = GetType();
-      types[0] = GetType();
+  }
-    }
   return types._retn();
 }
 
+//=======================================================================
+//function : IsMeshInfoCorrect
+//purpose  : * Returns false if GetMeshInfo() returns incorrect information that may
+//           * happen if mesh data is not yet fully loaded from the file of study.
+//=======================================================================
+
+bool SMESH_GroupBase_i::IsMeshInfoCorrect()
+{
+  return myPreMeshInfo ? myPreMeshInfo->IsMeshInfoCorrect() : true;
+}
+
 //================================================================================
 /*!
  * \brief Retrieves the predicate from the filter
@@ -714,6 +758,9 @@ SMESH_PredicatePtr SMESH_GroupOnFilter_i::GetPredicate( SMESH::Filter_ptr filter
 
 void SMESH_GroupOnFilter_i::SetFilter(SMESH::Filter_ptr theFilter)
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   if ( ! myFilter->_is_nil() )
     myFilter->UnRegister();
 
@@ -838,6 +885,12 @@ SMESH::Filter_ptr SMESH_GroupOnFilter_i::StringToFilter(const std::string& thePe
   return filter._retn();
 }
 
+//================================================================================
+/*!
+ * \brief Destructor of SMESH_GroupOnFilter_i
+ */
+//================================================================================
+
 SMESH_GroupOnFilter_i::~SMESH_GroupOnFilter_i()
 {
   if ( ! myFilter->_is_nil() )
@@ -847,8 +900,17 @@ SMESH_GroupOnFilter_i::~SMESH_GroupOnFilter_i()
   }
 }
 
+//================================================================================
+/*!
+ * \brief Method calleds when a predicate of myFilter changes
+ */
+//================================================================================
+
 void SMESH_GroupOnFilter_i::PredicateChanged()
 {
+  if ( myPreMeshInfo )
+    myPreMeshInfo->FullLoadFromFile();
+
   if ( SMESHDS_GroupOnFilter* grDS = dynamic_cast< SMESHDS_GroupOnFilter*>( GetGroupDS() ))
     grDS->SetPredicate( GetPredicate( myFilter ));
 }

src/SMESH_I/SMESH_Group_i.hxx

@@ -41,6 +41,7 @@
 
 class SMESH_Group;
 class SMESHDS_GroupBase;
+class SMESH_PreMeshInfo;
 
 // ===========
 // Group Base
@@ -67,7 +68,8 @@ class SMESH_I_EXPORT SMESH_GroupBase_i:
   SMESH::long_array* GetNodeIDs();
   CORBA::Long GetNumberOfNodes();
   CORBA::Boolean IsNodeInfoAvailable(); // for gui
-  SMESH::SMESH_Mesh_ptr GetMesh();
+
+  virtual SMESH::SMESH_Mesh_ptr GetMesh();
 
   /*!
    * Returns statistic of mesh elements
@@ -84,6 +86,11 @@ class SMESH_I_EXPORT SMESH_GroupBase_i:
    * Inherited from SMESH_IDSource interface
    */
   virtual SMESH::array_of_ElementType* GetTypes();
+  /*!
+   * Returns false if GetMeshInfo() returns incorrect information that may
+   * happen if mesh data is not yet fully loaded from the file of study.
+   */
+  virtual bool IsMeshInfoCorrect();
 
   // Internal C++ interface
   int GetLocalID() const { return myLocalID; }
@@ -97,6 +104,12 @@ class SMESH_I_EXPORT SMESH_GroupBase_i:
   void SetColorNumber(CORBA::Long color);
   CORBA::Long GetColorNumber();
 
+protected:
+
+  SMESH_PreMeshInfo* & changePreMeshInfo() { return myPreMeshInfo; }
+  SMESH_PreMeshInfo* myPreMeshInfo; // mesh info before full loading from study file
+  friend class SMESH_PreMeshInfo;
+
 private:
   SMESH_Mesh_i* myMeshServant;
   int myLocalID;

src/SMESH_I/SMESH_subMesh_i.cxx

@@ -24,11 +24,11 @@
 //  File   : SMESH_subMesh_i.cxx
 //  Author : Paul RASCLE, EDF
 //  Module : SMESH
-//  $Header$
 //
 #include "SMESH_subMesh_i.hxx"
 #include "SMESH_Gen_i.hxx"
 #include "SMESH_Mesh_i.hxx"
+#include "SMESH_PreMeshInfo.hxx"
 
 #include "Utils_CorbaException.hxx"
 #include "utilities.h"
@@ -50,7 +50,7 @@ SMESH_subMesh_i::SMESH_subMesh_i()
      : SALOME::GenericObj_i( PortableServer::POA::_nil() )
 {
   MESSAGE("SMESH_subMesh_i::SMESH_subMesh_i default, not for use");
-    ASSERT(0);
+  ASSERT(0);
 }
 
 //=============================================================================
@@ -65,11 +65,10 @@ SMESH_subMesh_i::SMESH_subMesh_i( PortableServer::POA_ptr thePOA,
                                   int                     localId )
      : SALOME::GenericObj_i( thePOA )
 {
-  MESSAGE("SMESH_subMesh_i::SMESH_subMesh_i");
   _gen_i = gen_i;
   _mesh_i = mesh_i;
   _localId = localId;
-  // ****
+  _preMeshInfo = NULL;
 }
 //=============================================================================
 /*!
@@ -80,7 +79,8 @@ SMESH_subMesh_i::SMESH_subMesh_i( PortableServer::POA_ptr thePOA,
 SMESH_subMesh_i::~SMESH_subMesh_i()
 {
   MESSAGE("SMESH_subMesh_i::~SMESH_subMesh_i");
-  // ****
+  if ( _preMeshInfo ) delete _preMeshInfo;
+  _preMeshInfo = NULL;
 }
 
 //=======================================================================
@@ -162,7 +162,10 @@ CORBA::Long SMESH_subMesh_i::GetNumberOfElements()
   throw (SALOME::SALOME_Exception)
 {
   Unexpect aCatch(SALOME_SalomeException);
-  MESSAGE("SMESH_subMesh_i::GetNumberOfElements");
+
+  if ( _preMeshInfo )
+    return _preMeshInfo->NbElements();
+
   if ( _mesh_i->_mapSubMesh.find( _localId ) == _mesh_i->_mapSubMesh.end() )
     return 0;
 
@@ -192,10 +195,15 @@ CORBA::Long SMESH_subMesh_i::GetNumberOfNodes(CORBA::Boolean all)
   throw (SALOME::SALOME_Exception)
 {
   Unexpect aCatch(SALOME_SalomeException);
-  MESSAGE("SMESH_subMesh_i::GetNumberOfNodes");
+
   if ( _mesh_i->_mapSubMesh.find( _localId ) == _mesh_i->_mapSubMesh.end() )
     return 0;
 
+  if ( _preMeshInfo )
+  {
+    if ( all ) return _preMeshInfo->NbNodes();
+    else _preMeshInfo->FullLoadFromFile();
+  }
   ::SMESH_subMesh* aSubMesh = _mesh_i->_mapSubMesh[_localId];
   SMESHDS_SubMesh* aSubMeshDS = aSubMesh->GetSubMeshDS();
 
@@ -258,12 +266,15 @@ SMESH::long_array* SMESH_subMesh_i::GetElementsId()
   throw (SALOME::SALOME_Exception)
 {
   Unexpect aCatch(SALOME_SalomeException);
-  MESSAGE("SMESH_subMesh_i::GetElementsId");
+
   SMESH::long_array_var aResult = new SMESH::long_array();
 
   if ( _mesh_i->_mapSubMesh.find( _localId ) == _mesh_i->_mapSubMesh.end() )
     return aResult._retn();
 
+  if ( _preMeshInfo )
+    _preMeshInfo->FullLoadFromFile();
+
   ::SMESH_subMesh* aSubMesh = _mesh_i->_mapSubMesh[_localId];
   SMESHDS_SubMesh* aSubMeshDS = aSubMesh->GetSubMeshDS();
 
@@ -305,12 +316,15 @@ SMESH::long_array* SMESH_subMesh_i::GetElementsByType( SMESH::ElementType theEle
     throw (SALOME::SALOME_Exception)
 {
   Unexpect aCatch(SALOME_SalomeException);
-  MESSAGE("SMESH_subMesh_i::GetElementsByType");
+
   SMESH::long_array_var aResult = new SMESH::long_array();
 
   if ( _mesh_i->_mapSubMesh.find( _localId ) == _mesh_i->_mapSubMesh.end() )
     return aResult._retn();
 
+  if ( _preMeshInfo )
+    _preMeshInfo->FullLoadFromFile();
+
   ::SMESH_subMesh* aSubMesh = _mesh_i->_mapSubMesh[_localId];
   SMESHDS_SubMesh* aSubMeshDS = aSubMesh->GetSubMeshDS();
 
@@ -413,7 +427,7 @@ SMESH::long_array* SMESH_subMesh_i::GetNodesId()
   throw (SALOME::SALOME_Exception)
 {
   Unexpect aCatch(SALOME_SalomeException);
-  MESSAGE("SMESH_subMesh_i::GetNodesId");
+
   SMESH::long_array_var aResult = GetElementsByType( SMESH::NODE );
   return aResult._retn();
 }
@@ -428,7 +442,6 @@ SMESH::SMESH_Mesh_ptr SMESH_subMesh_i::GetFather()
   throw (SALOME::SALOME_Exception)
 {
   Unexpect aCatch(SALOME_SalomeException);
-  MESSAGE("SMESH_subMesh_i::GetFather");
   return _mesh_i->_this();
 }
 
@@ -440,7 +453,6 @@ SMESH::SMESH_Mesh_ptr SMESH_subMesh_i::GetFather()
   
 CORBA::Long SMESH_subMesh_i::GetId()
 {
-  MESSAGE("SMESH_subMesh_i::GetId");
   return _localId;
 }
 
@@ -482,6 +494,8 @@ SALOME_MED::FAMILY_ptr SMESH_subMesh_i::GetFamily()
   throw (SALOME::SALOME_Exception)
 {
   Unexpect aCatch(SALOME_SalomeException);
+  if ( _preMeshInfo )
+    _preMeshInfo->FullLoadFromFile();
   SALOME_MED::MESH_var MEDMesh = GetFather()->GetMEDMesh();
 
   SALOME_MED::Family_array_var families = 
@@ -502,8 +516,7 @@ SALOME_MED::FAMILY_ptr SMESH_subMesh_i::GetFamily()
 //=============================================================================
 SMESH::long_array* SMESH_subMesh_i::GetIDs()
 {
-  SMESH::long_array_var aResult = GetElementsId();
+  return GetElementsId();
-  return aResult._retn();
 }
 
 //=============================================================================
@@ -514,6 +527,8 @@ SMESH::long_array* SMESH_subMesh_i::GetIDs()
 SMESH::ElementType SMESH_subMesh_i::GetElementType( const CORBA::Long id, const bool iselem )
   throw (SALOME::SALOME_Exception)
 {
+  if ( _preMeshInfo )
+    _preMeshInfo->FullLoadFromFile();
   return GetFather()->GetElementType( id, iselem );
 }
 
@@ -527,6 +542,9 @@ SMESH::ElementType SMESH_subMesh_i::GetElementType( const CORBA::Long id, const
 //=============================================================================
 SMESH::long_array* SMESH_subMesh_i::GetMeshInfo()
 {
+  if ( _preMeshInfo )
+    return _preMeshInfo->GetMeshInfo();
+
   SMESH::long_array_var aRes = new SMESH::long_array();
   aRes->length(SMESH::Entity_Last);
   for (int i = SMESH::Entity_Node; i < SMESH::Entity_Last; i++)
@@ -554,6 +572,9 @@ SMESH::long_array* SMESH_subMesh_i::GetMeshInfo()
 
 SMESH::array_of_ElementType* SMESH_subMesh_i::GetTypes()
 {
+  if ( _preMeshInfo )
+    return _preMeshInfo->GetTypes();
+
   SMESH::array_of_ElementType_var types = new SMESH::array_of_ElementType;
 
   ::SMESH_subMesh* aSubMesh = _mesh_i->_mapSubMesh[_localId];
@@ -592,3 +613,14 @@ SMESH::SMESH_Mesh_ptr SMESH_subMesh_i::GetMesh()
 {
   return GetFather();
 }
+
+//=======================================================================
+//function : IsMeshInfoCorrect
+//purpose  : * Returns false if GetMeshInfo() returns incorrect information that may
+//           * happen if mesh data is not yet fully loaded from the file of study.
+//=======================================================================
+
+bool SMESH_subMesh_i::IsMeshInfoCorrect()
+{
+  return _preMeshInfo ? _preMeshInfo->IsMeshInfoCorrect() : true;
+}

src/SMESH_I/SMESH_subMesh_i.hxx

@@ -40,6 +40,7 @@
 #include "SMESH_Mesh_i.hxx"
 
 class SMESH_Gen_i;
+class SMESH_PreMeshInfo;
 
 class SMESH_I_EXPORT SMESH_subMesh_i:
   public virtual POA_SMESH::SMESH_subMesh,
@@ -65,9 +66,6 @@ public:
   SMESH::long_array* GetElementsByType( SMESH::ElementType theElemType )
     throw (SALOME::SALOME_Exception);
   
-  //for omniORB conflict compilation
-  /*SMESH::ElementType GetElementType( const CORBA::Long id, const bool iselem )
-    throw (SALOME::SALOME_Exception);*/
   SMESH::ElementType GetElementType( CORBA::Long id, bool iselem )
     throw (SALOME::SALOME_Exception);
   
@@ -106,17 +104,27 @@ public:
   /*!
    * Returns the mesh
    */
-  SMESH::SMESH_Mesh_ptr GetMesh();
+  virtual SMESH::SMESH_Mesh_ptr GetMesh();
+  /*!
+   * Returns false if GetMeshInfo() returns incorrect information that may
+   * happen if mesh data is not yet fully loaded from the file of study.
+   */
+  virtual bool IsMeshInfoCorrect();
 
 
-  SMESH_Mesh_i* _mesh_i; //NRI
-
 protected:
-  void changeLocalId(int localId) { _localId = localId; }
-  SMESH_Gen_i* _gen_i;
-  int _localId;
 
+  SMESH_Gen_i*  _gen_i;
+  int           _localId;
+  SMESH_Mesh_i* _mesh_i; //NRI
+
+  void changeLocalId(int localId) { _localId = localId; }
   friend void SMESH_Mesh_i::CheckGeomGroupModif();
+
+  SMESH_PreMeshInfo* _preMeshInfo; // mesh info before full loading from study file
+
+  SMESH_PreMeshInfo* & changePreMeshInfo() { return _preMeshInfo; }
+  friend class SMESH_PreMeshInfo;
 };
 
 #endif