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

+	SMESH_PreMeshInfo.hxx \

src/SMESH_I/Makefile.am

@@ -47,6 +47,7 @@ salomeinclude_HEADERS = \
 	SMESH_2smeshpy.hxx \
 	SMESH_NoteBook.hxx \
 	SMESH_Measurements_i.hxx \
+	SMESH_PreMeshInfo.hxx \
 	SMESH.hxx
 
 # Scripts to be installed.
@@ -78,7 +79,8 @@ dist_libSMESHEngine_la_SOURCES = \
 	SMESH_Pattern_i.cxx \
 	SMESH_2smeshpy.cxx \
 	SMESH_NoteBook.cxx \
-	SMESH_Measurements_i.cxx
+	SMESH_Measurements_i.cxx \
+	SMESH_PreMeshInfo.cxx
 
 # Executables targets
 bin_PROGRAMS = SMESHEngine

src/SMESH_I/SMESH_PreMeshInfo.hxx

@@ -0,0 +1,125 @@
+// Copyright (C) 2007-2011  CEA/DEN, EDF R&D, OPEN CASCADE
+//
+// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+// File      : SMESH_PreMeshInfo.hxx
+// Created   : Fri Feb 10 13:25:02 2012
+// Author    : Edward AGAPOV (eap)
+
+
+#ifndef __SMESH_PreMeshInfo_HXX__
+#define __SMESH_PreMeshInfo_HXX__
+
+#include "SMDS_MeshInfo.hxx"
+
+#include CORBA_SERVER_HEADER(SMESH_Mesh)
+#include CORBA_SERVER_HEADER(SALOMEDS)
+
+#include <TopAbs_ShapeEnum.hxx>
+
+class DriverMED_R_SMESHDS_Mesh;
+class HDFfile;
+class HDFgroup;
+class SMESH_Mesh_i;
+
+/*!
+ * \brief Class loading and holding information of a mesh object (mesh, group, submesh)
+ *        not yet loaded from HDF file of study.
+ *
+ * Usage scenario:
+ * - SMESH_PreMeshInfo::LoadFromFile() // reads info of all objects
+ * - if ( myPreInfo ) myPreInfo->NbElements() // access to info by objects
+ * - myPreInfo->FullLoadFromFile() // reads all mesh data and resets myPreInfo=NULL
+ */
+
+class SMESH_PreMeshInfo : public SMDS_MeshInfo
+{
+public:
+  // fills SMESH_PreMeshInfo field of all objects of mesh
+  static void LoadFromFile( SMESH_Mesh_i*      mesh,
+                            const int          meshID,
+                            const std::string& medFile,
+                            const std::string& hdfFile,
+                            const bool         toRemoveFiles);
+
+  // saves SMESH_PreMeshInfo to the study file
+  static void SaveToFile( SMESH_Mesh_i* mesh,
+                          const int     meshID,
+                          HDFfile*      hdfFile);
+
+  // reads all data and remove all SMESH_PreMeshInfo fields from objects
+  void FullLoadFromFile() const;
+
+  // remove all SMESH_PreMeshInfo fields from objects w/o data loading
+  void ForgetAllData() const;
+
+  // calls either FullLoadFromFile() or ForgetAllData() depending on preferences;
+  // is called on hypothesis modification
+  void ForgetOrLoad() const;
+
+  // meshods of SMESH_IDSource interface
+  SMESH::array_of_ElementType* GetTypes() const;
+  SMESH::long_array*           GetMeshInfo() const;
+  bool                         IsMeshInfoCorrect() const;
+
+  ~SMESH_PreMeshInfo();
+
+  // TEMPORARY method to remove study files on closing study;
+  // RIGHT WAY: study files are remove automatically when meshes are destroyed
+  static void RemoveStudyFiles_TMP_METHOD(SALOMEDS::SComponent_ptr smeshComp);
+
+private:
+
+  // creation by LoadFromFile() only
+  SMESH_PreMeshInfo(SMESH_Mesh_i*      mesh,
+                    const int          meshID,
+                    const std::string& medFile,
+                    const std::string& hdfFile);
+
+  SMESH_PreMeshInfo* newInstance()
+  { return new SMESH_PreMeshInfo( _mesh,_meshID,_medFileName,_hdfFileName ); }
+
+  // reading from the new study, for which SaveToFile() was called
+  bool readPreInfoFromHDF();
+  void hdf2meshInfo( const std::string& dataSetName, HDFgroup* infoHdfGroup );
+
+  // reading from the old study, for which SaveToFile() was not called
+  bool readMeshInfo();
+  void readGroupInfo();
+  void readSubMeshInfo();
+  SMDSAbs_EntityType getElemType( const TopAbs_ShapeEnum shapeType,
+                                  const int              nbElemsInSubMesh,
+                                  bool&                  isKoType) const;
+
+  void readSubMeshes(DriverMED_R_SMESHDS_Mesh* reader) const;
+
+  // general data
+  std::string   _medFileName, _hdfFileName;
+  bool          _toRemoveFiles;
+  int           _meshID;
+  SMESH_Mesh_i* _mesh;
+  bool          _isInfoOk;
+
+  int _elemCounter; /* used as a counter while mesh info reading and
+                       as a signal that mesh info is incorrect after reading
+                     */
+};
+
+#endif