1 // Copyright (C) 2007-2013 CEA/DEN, EDF R&D, OPEN CASCADE
3 // Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
4 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
6 // This library is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU Lesser General Public
8 // License as published by the Free Software Foundation; either
9 // version 2.1 of the License.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // Lesser General Public License for more details.
16 // You should have received a copy of the GNU Lesser General Public
17 // License along with this library; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
23 // SMESH SMESHGUI_Selection
24 // File : SMESHGUI_Selection.cxx
25 // Author : Alexander SOLOVYOV, Open CASCADE S.A.S.
29 #include "SMESHGUI_Selection.h"
31 #include "SMESHGUI_Utils.h"
32 #include "SMESHGUI_VTKUtils.h"
33 #include "SMESHGUI_GEOMGenUtils.h"
34 #include "SMESHGUI_ComputeDlg.h"
36 #include <SMESH_Type.h>
37 #include <SMESH_Actor.h>
38 #include <SMESH_ScalarBarActor.h>
40 // SALOME GUI includes
41 #include <SalomeApp_Study.h>
42 #include <LightApp_VTKSelector.h>
43 #include <SVTK_ViewWindow.h>
46 #include <SALOMEconfig.h>
47 #include CORBA_CLIENT_HEADER(SMESH_Gen)
48 #include CORBA_CLIENT_HEADER(SMESH_Mesh)
49 #include CORBA_CLIENT_HEADER(SMESH_Group)
51 //=======================================================================
52 //function : SMESHGUI_Selection
54 //=======================================================================
55 SMESHGUI_Selection::SMESHGUI_Selection()
56 : LightApp_Selection()
60 //=======================================================================
61 //function : ~SMESHGUI_Selection
63 //=======================================================================
64 SMESHGUI_Selection::~SMESHGUI_Selection()
68 //=======================================================================
71 //=======================================================================
72 void SMESHGUI_Selection::init( const QString& client, LightApp_SelectionMgr* mgr )
74 LightApp_Selection::init( client, mgr );
78 SalomeApp_Study* aSStudy = dynamic_cast<SalomeApp_Study*>(study());
81 _PTR(Study) aStudy = aSStudy->studyDS();
83 for( int i=0, n=count(); i<n; i++ )
84 myTypes.append( typeName( type( entry( i ), aStudy ) ) );
88 //=======================================================================
89 //function : processOwner
91 //=======================================================================
92 bool SMESHGUI_Selection::processOwner( const LightApp_DataOwner* ow )
94 const LightApp_SVTKDataOwner* owner =
95 dynamic_cast<const LightApp_SVTKDataOwner*> ( ow );
97 myActors.append( dynamic_cast<SMESH_Actor*>( owner->GetActor() ) );
103 //=======================================================================
104 //function : parameter
106 //=======================================================================
107 QVariant SMESHGUI_Selection::parameter( const int ind, const QString& p ) const
110 if ( p=="client" ) val = QVariant( LightApp_Selection::parameter( p ) );
111 else if ( p=="type" ) val = QVariant( myTypes[ind] );
112 else if ( p=="elemTypes" ) val = QVariant( elemTypes( ind ) );
113 else if ( p=="isAutoColor" ) val = QVariant( isAutoColor( ind ) );
114 else if ( p=="numberOfNodes" ) val = QVariant( numberOfNodes( ind ) );
115 else if ( p=="dim" ) val = QVariant( dim( ind ) );
116 else if ( p=="labeledTypes" ) val = QVariant( labeledTypes( ind ) );
117 else if ( p=="shrinkMode" ) val = QVariant( shrinkMode( ind ) );
118 else if ( p=="entityMode" ) val = QVariant( entityMode( ind ) );
119 else if ( p=="controlMode" ) val = QVariant( controlMode( ind ) );
120 else if ( p=="isNumFunctor" ) val = QVariant( isNumFunctor( ind ) );
121 else if ( p=="displayMode" ) val = QVariant( displayMode( ind ) );
122 else if ( p=="isComputable" ) val = QVariant( isComputable( ind ) );
123 else if ( p=="isPreComputable" ) val = QVariant( isPreComputable( ind ) );
124 else if ( p=="hasReference" ) val = QVariant( hasReference( ind ) );
125 else if ( p=="isImported" ) val = QVariant( isImported( ind ) );
126 else if ( p=="facesOrientationMode" ) val = QVariant( facesOrientationMode( ind ) );
127 else if ( p=="groupType" ) val = QVariant( groupType( ind ) );
128 else if ( p=="quadratic2DMode") val = QVariant(quadratic2DMode(ind));
129 else if ( p=="isDistributionVisible") val = QVariant(isDistributionVisible(ind));
130 else if ( p=="hasChildren") val = QVariant(hasChildren(ind));
131 else if ( p=="nbChildren") val = QVariant(nbChildren(ind));
132 else if ( p=="isContainer") val = QVariant(isContainer(ind));
137 return LightApp_Selection::parameter( ind, p );
140 //=======================================================================
141 //function : getVtkOwner
143 //=======================================================================
145 SMESH_Actor* SMESHGUI_Selection::getActor( int ind ) const
147 if( ind >= 0 && ind < count() )
148 return myActors.isEmpty() ? 0 : myActors.at( ind );
153 //=======================================================================
154 //function : elemTypes
155 //purpose : may return {'Elem0d' 'Edge' 'Face' 'Volume' 'BallElem'} at most
156 //=======================================================================
158 QList<QVariant> SMESHGUI_Selection::elemTypes( int ind ) const
160 QList<QVariant> types;
161 SMESH_Actor* actor = getActor( ind );
163 TVisualObjPtr object = actor->GetObject();
165 if ( object->GetNbEntities( SMDSAbs_0DElement )) types.append( "Elem0d" );
166 if ( object->GetNbEntities( SMDSAbs_Ball )) types.append( "BallElem" );
167 if ( object->GetNbEntities( SMDSAbs_Edge )) types.append( "Edge" );
168 if ( object->GetNbEntities( SMDSAbs_Face )) types.append( "Face" );
169 if ( object->GetNbEntities( SMDSAbs_Volume )) types.append( "Volume" );
175 //=======================================================================
176 //function : labeledTypes
177 //purpose : may return {'Point' 'Cell'} at most
178 //=======================================================================
180 QList<QVariant> SMESHGUI_Selection::labeledTypes( int ind ) const
182 QList<QVariant> types;
183 SMESH_Actor* actor = getActor( ind );
185 if ( actor->GetPointsLabeled()) types.append( "Point" );
186 if ( actor->GetCellsLabeled()) types.append( "Cell" );
191 //=======================================================================
192 //function : displayMode
193 //purpose : return SMESH_Actor::EReperesent
194 //=======================================================================
196 QString SMESHGUI_Selection::displayMode( int ind ) const
198 SMESH_Actor* actor = getActor( ind );
200 switch( actor->GetRepresentation() ) {
201 case SMESH_Actor::eEdge: return "eEdge";
202 case SMESH_Actor::eSurface: return "eSurface";
203 case SMESH_Actor::ePoint: return "ePoint";
211 //=======================================================================
212 //function : quadratic2DMode
213 //purpose : return SMESH_Actor::EQuadratic2DRepresentation
214 //=======================================================================
215 QString SMESHGUI_Selection::quadratic2DMode( int ind ) const
217 SMESH_Actor* actor = getActor( ind );
219 switch( actor->GetQuadratic2DRepresentation() ) {
220 case SMESH_Actor::eLines: return "eLines";
221 case SMESH_Actor::eArcs: return "eArcs";
228 //=======================================================================
229 //function : isDistributionVisible
230 //purpose : Visible/Invisible distribution of the ScalarBar Actor
231 //=======================================================================
233 bool SMESHGUI_Selection::isDistributionVisible(int ind) const {
234 SMESH_Actor* actor = getActor( ind );
235 return (actor && actor->GetScalarBarActor() && actor->GetScalarBarActor()->GetDistributionVisibility());
238 //=======================================================================
239 //function : shrinkMode
240 //purpose : return either 'IsSrunk', 'IsNotShrunk' or 'IsNotShrinkable'
241 //=======================================================================
243 QString SMESHGUI_Selection::shrinkMode( int ind ) const
245 SMESH_Actor* actor = getActor( ind );
246 if ( actor && actor->IsShrunkable() ) {
247 if ( actor->IsShrunk() )
249 return "IsNotShrunk";
251 return "IsNotShrinkable";
254 //=======================================================================
255 //function : entityMode
256 //purpose : may return {'Elem0d' 'Edge' 'Face' 'Volume' 'BallElem' } at most
257 //=======================================================================
259 QList<QVariant> SMESHGUI_Selection::entityMode( int ind ) const
261 QList<QVariant> types;
262 SMESH_Actor* actor = getActor( ind );
264 unsigned int aMode = actor->GetEntityMode();
265 if ( aMode & SMESH_Actor::eVolumes ) types.append( "Volume" );
266 if ( aMode & SMESH_Actor::eFaces ) types.append( "Face" );
267 if ( aMode & SMESH_Actor::eEdges ) types.append( "Edge" );
268 if ( aMode & SMESH_Actor::e0DElements ) types.append( "Elem0d" );
269 if ( aMode & SMESH_Actor::eBallElem ) types.append( "BallElem" );
274 //=======================================================================
275 //function : controlMode
276 //purpose : return SMESH_Actor::eControl
277 //=======================================================================
279 QString SMESHGUI_Selection::controlMode( int ind ) const
281 SMESH_Actor* actor = getActor( ind );
282 QString mode = "eNone";
284 switch( actor->GetControlMode() ) {
285 case SMESH_Actor::eLength: mode = "eLength"; break;
286 case SMESH_Actor::eLength2D: mode = "eLength2D"; break;
287 case SMESH_Actor::eFreeEdges: mode = "eFreeEdges"; break;
288 case SMESH_Actor::eFreeNodes: mode = "eFreeNodes"; break;
289 case SMESH_Actor::eFreeBorders: mode = "eFreeBorders"; break;
290 case SMESH_Actor::eFreeFaces: mode = "eFreeFaces"; break;
291 case SMESH_Actor::eMultiConnection: mode = "eMultiConnection"; break;
292 case SMESH_Actor::eMultiConnection2D: mode = "eMultiConnection2D"; break;
293 case SMESH_Actor::eArea: mode = "eArea"; break;
294 case SMESH_Actor::eVolume3D: mode = "eVolume3D"; break;
295 case SMESH_Actor::eMaxElementLength2D: mode = "eMaxElementLength2D"; break;
296 case SMESH_Actor::eMaxElementLength3D: mode = "eMaxElementLength3D"; break;
297 case SMESH_Actor::eTaper: mode = "eTaper"; break;
298 case SMESH_Actor::eAspectRatio: mode = "eAspectRatio"; break;
299 case SMESH_Actor::eAspectRatio3D: mode = "eAspectRatio3D"; break;
300 case SMESH_Actor::eMinimumAngle: mode = "eMinimumAngle"; break;
301 case SMESH_Actor::eWarping: mode = "eWarping"; break;
302 case SMESH_Actor::eSkew: mode = "eSkew"; break;
303 case SMESH_Actor::eBareBorderFace: mode = "eBareBorderFace"; break;
304 case SMESH_Actor::eBareBorderVolume: mode = "eBareBorderVolume"; break;
305 case SMESH_Actor::eOverConstrainedFace: mode = "eOverConstrainedFace"; break;
306 case SMESH_Actor::eOverConstrainedVolume: mode = "eOverConstrainedVolume"; break;
307 case SMESH_Actor::eCoincidentNodes: mode = "eCoincidentNodes"; break;
308 case SMESH_Actor::eCoincidentElems1D: mode = "eCoincidentElems1D"; break;
309 case SMESH_Actor::eCoincidentElems2D: mode = "eCoincidentElems2D"; break;
310 case SMESH_Actor::eCoincidentElems3D: mode = "eCoincidentElems3D"; break;
317 bool SMESHGUI_Selection::isNumFunctor( int ind ) const
320 SMESH_Actor* actor = getActor( ind );
322 switch( actor->GetControlMode() ) {
323 case SMESH_Actor::eLength:
324 case SMESH_Actor::eLength2D:
325 case SMESH_Actor::eMultiConnection:
326 case SMESH_Actor::eMultiConnection2D:
327 case SMESH_Actor::eArea:
328 case SMESH_Actor::eVolume3D:
329 case SMESH_Actor::eMaxElementLength2D:
330 case SMESH_Actor::eMaxElementLength3D:
331 case SMESH_Actor::eTaper:
332 case SMESH_Actor::eAspectRatio:
333 case SMESH_Actor::eAspectRatio3D:
334 case SMESH_Actor::eMinimumAngle:
335 case SMESH_Actor::eWarping:
336 case SMESH_Actor::eSkew:
346 //=======================================================================
347 //function : facesOrientationMode
349 //=======================================================================
351 QString SMESHGUI_Selection::facesOrientationMode( int ind ) const
353 SMESH_Actor* actor = getActor( ind );
355 if ( actor->GetFacesOriented() )
357 return "IsNotOriented";
362 //=======================================================================
363 //function : isAutoColor
365 //=======================================================================
367 bool SMESHGUI_Selection::isAutoColor( int ind ) const
369 if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
371 _PTR(SObject) sobj = SMESH::GetActiveStudyDocument()->FindObjectID( entry( ind ).toLatin1().data() );
372 CORBA::Object_var obj = SMESH::SObjectToObject( sobj, SMESH::GetActiveStudyDocument() );
374 if ( ! CORBA::is_nil( obj )) {
375 SMESH::SMESH_Mesh_var mesh = SMESH::SMESH_Mesh::_narrow( obj );
376 if ( ! mesh->_is_nil() )
377 return mesh->GetAutoColor();
383 //=======================================================================
384 //function : numberOfNodes
385 //purpose : this method is actually used to check if an object is empty or not
386 //=======================================================================
388 int SMESHGUI_Selection::numberOfNodes( int ind ) const
390 if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
392 _PTR(SObject) sobj = SMESH::GetActiveStudyDocument()->FindObjectID( entry( ind ).toLatin1().data() );
393 CORBA::Object_var obj = SMESH::SObjectToObject( sobj, SMESH::GetActiveStudyDocument() );
395 if ( ! CORBA::is_nil( obj )) {
396 SMESH::SMESH_Mesh_var mesh = SMESH::SMESH_Mesh::_narrow( obj );
397 if ( ! mesh->_is_nil() )
398 return mesh->NbNodes();
399 SMESH::SMESH_subMesh_var aSubMeshObj = SMESH::SMESH_subMesh::_narrow( obj );
400 if ( !aSubMeshObj->_is_nil() )
401 return aSubMeshObj->GetNumberOfNodes(true);
402 SMESH::SMESH_GroupBase_var aGroupObj = SMESH::SMESH_GroupBase::_narrow( obj );
403 if ( !aGroupObj->_is_nil() )
404 return aGroupObj->IsEmpty(); // aGroupObj->Size();
410 //================================================================================
412 * \brief return dimension of elements of the selected object
414 * \retval int - 0 for 0D elements, -1 for an empty object (the rest as usual)
416 //================================================================================
418 int SMESHGUI_Selection::dim( int ind ) const
421 if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
423 _PTR(SObject) sobj = SMESH::GetActiveStudyDocument()->FindObjectID( entry( ind ).toLatin1().data() );
424 CORBA::Object_var obj = SMESH::SObjectToObject( sobj, SMESH::GetActiveStudyDocument() );
426 if ( ! CORBA::is_nil( obj )) {
427 SMESH::SMESH_IDSource_var idSrc = SMESH::SMESH_IDSource::_narrow( obj );
428 if ( ! idSrc->_is_nil() )
430 SMESH::array_of_ElementType_var types = idSrc->GetTypes();
431 for ( int i = 0; i < types->length(); ++ i)
432 switch ( types[i] ) {
433 case SMESH::EDGE : dim = std::max( dim, 1 ); break;
434 case SMESH::FACE : dim = std::max( dim, 2 ); break;
435 case SMESH::VOLUME: dim = std::max( dim, 3 ); break;
436 case SMESH::ELEM0D: dim = std::max( dim, 0 ); break;
437 case SMESH::BALL : dim = std::max( dim, 0 ); break;
446 //=======================================================================
447 //function : isComputable
449 //=======================================================================
451 QVariant SMESHGUI_Selection::isComputable( int ind ) const
453 if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
455 /* Handle(SALOME_InteractiveObject) io =
456 static_cast<LightApp_DataOwner*>( myDataOwners[ ind ].get() )->IO();
457 if ( !io.IsNull() ) {
458 SMESH::SMESH_Mesh_var mesh = SMESH::GetMeshByIO(io); // m,sm,gr->m
459 if ( !mesh->_is_nil() ) {*/
460 _PTR(SObject) so = SMESH::GetActiveStudyDocument()->FindObjectID( entry( ind ).toLatin1().data() );
461 //FindSObject( mesh );
463 CORBA::Object_var obj = SMESH::SObjectToObject(so, SMESH::GetActiveStudyDocument());
464 if(!CORBA::is_nil(obj)){
465 SMESH::SMESH_Mesh_var mesh = SMESH::SMESH_Mesh::_narrow( obj );
466 if (!mesh->_is_nil()){
467 if(mesh->HasShapeToMesh()) {
468 GEOM::GEOM_Object_var shape = SMESH::GetShapeOnMeshOrSubMesh( so );
469 return QVariant( !shape->_is_nil() );
473 return QVariant(!mesh->NbFaces()==0);
478 GEOM::GEOM_Object_var shape = SMESH::GetShapeOnMeshOrSubMesh( so );
479 return QVariant( !shape->_is_nil() );
486 return QVariant( false );
489 //=======================================================================
490 //function : isPreComputable
492 //=======================================================================
494 QVariant SMESHGUI_Selection::isPreComputable( int ind ) const
496 if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
498 QMap<int,int> modeMap;
499 _PTR(SObject) pMesh = SMESH::GetActiveStudyDocument()->FindObjectID( entry( ind ).toLatin1().data() );
500 SMESHGUI_PrecomputeOp::getAssignedAlgos( pMesh, modeMap );
501 return QVariant( modeMap.size() > 1 );
503 return QVariant( false );
506 //=======================================================================
507 //function : hasReference
509 //=======================================================================
511 QVariant SMESHGUI_Selection::hasReference( int ind ) const
513 return QVariant( isReference( ind ) );
516 //=======================================================================
517 //function : isVisible
519 //=======================================================================
521 QVariant SMESHGUI_Selection::isVisible( int ind ) const
523 if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
525 QString ent = entry( ind );
526 SMESH_Actor* actor = SMESH::FindActorByEntry( ent.toLatin1().data() );
527 if ( actor && actor->hasIO() ) {
528 if(SVTK_ViewWindow* aViewWindow = SMESH::GetCurrentVtkView())
529 return QVariant( aViewWindow->isVisible( actor->getIO() ) );
532 return QVariant( false );
535 //=======================================================================
536 //function : hasChildren
538 //=======================================================================
540 bool SMESHGUI_Selection::hasChildren( int ind ) const
544 _PTR(SObject) sobj = SMESH::GetActiveStudyDocument()->FindObjectID( entry( ind ).toLatin1().data() );
545 return SMESH::GetActiveStudyDocument()->GetUseCaseBuilder()->HasChildren( sobj );
550 //=======================================================================
551 //function : hasChildren
553 //=======================================================================
555 int SMESHGUI_Selection::nbChildren( int ind ) const
560 _PTR(SObject) sobj = SMESH::GetActiveStudyDocument()->FindObjectID( entry( ind ).toLatin1().data() );
561 if ( sobj->GetStudy()->GetUseCaseBuilder()->IsUseCaseNode( sobj ) ) {
562 _PTR(UseCaseIterator) it = sobj->GetStudy()->GetUseCaseBuilder()->GetUseCaseIterator( sobj );
563 for (it->Init(false); it->More(); it->Next()) nb++;
569 //=======================================================================
570 //function : isContainer
572 //=======================================================================
574 bool SMESHGUI_Selection::isContainer( int ind ) const
576 return ind >= 0 && ind < myTypes.count() && myTypes[ind] == "Unknown";
579 //=======================================================================
582 //=======================================================================
584 int SMESHGUI_Selection::type( const QString& entry, _PTR(Study) study )
586 _PTR(SObject) obj (study->FindObjectID(entry.toLatin1().data()));
591 if( obj->ReferencedObject( ref ) )
594 _PTR(SObject) objFather = obj->GetFather();
595 _PTR(SComponent) objComponent = obj->GetFatherComponent();
597 if( objComponent->ComponentDataType()!="SMESH" )
600 if( objComponent->GetIOR()==obj->GetIOR() )
601 return SMESH::COMPONENT;
603 int aLevel = obj->Depth() - objComponent->Depth(),
604 aFTag = objFather->Tag(),
611 if (anOTag >= SMESH::Tag_FirstMeshRoot)
617 case SMESH::Tag_HypothesisRoot:
618 res = SMESH::HYPOTHESIS;
620 case SMESH::Tag_AlgorithmsRoot:
621 res = SMESH::ALGORITHM;
628 case SMESH::Tag_SubMeshOnVertex:
629 res = SMESH::SUBMESH_VERTEX;
631 case SMESH::Tag_SubMeshOnEdge:
632 res = SMESH::SUBMESH_EDGE;
634 case SMESH::Tag_SubMeshOnFace:
635 res = SMESH::SUBMESH_FACE;
637 case SMESH::Tag_SubMeshOnSolid:
638 res = SMESH::SUBMESH_SOLID;
640 case SMESH::Tag_SubMeshOnCompound:
641 res = SMESH::SUBMESH_COMPOUND;
644 if (aFTag >= SMESH::Tag_FirstGroup)
647 res = SMESH::SUBMESH;
655 //=======================================================================
656 //function : typeName
658 //=======================================================================
660 QString SMESHGUI_Selection::typeName( const int t )
664 case SMESH::HYPOTHESIS:
666 case SMESH::ALGORITHM:
672 case SMESH::MESHorSUBMESH:
673 return "Mesh or submesh";
674 case SMESH::SUBMESH_VERTEX:
675 return "Mesh vertex";
676 case SMESH::SUBMESH_EDGE:
678 case SMESH::SUBMESH_FACE:
680 case SMESH::SUBMESH_SOLID:
682 case SMESH::SUBMESH_COMPOUND:
683 return "Mesh compound";
686 case SMESH::COMPONENT:
693 bool SMESHGUI_Selection::isImported( const int ind ) const
695 QString e = entry( ind );
696 _PTR(SObject) SO = SMESH::GetActiveStudyDocument()->FindObjectID( e.toLatin1().constData() );
700 SMESH::SMESH_Mesh_var aMesh = SMESH::SMESH_Mesh::_narrow( SMESH::SObjectToObject( SO ) );
701 if( !aMesh->_is_nil() )
703 SMESH::MedFileInfo_var inf = aMesh->GetMEDFileInfo();
704 res = strlen( (char*)inf->fileName ) > 0;
710 //=======================================================================
711 //function : groupType
713 //=======================================================================
715 QString SMESHGUI_Selection::groupType( int ind ) const
717 QString e = entry( ind );
718 _PTR(SObject) SO = SMESH::GetActiveStudyDocument()->FindObjectID( e.toLatin1().constData() );
721 SMESH::SMESH_Group_var g = SMESH::SObjectToInterface<SMESH::SMESH_Group>( SO );
725 SMESH::SMESH_GroupOnGeom_var gog = SMESH::SObjectToInterface<SMESH::SMESH_GroupOnGeom>( SO );
726 if( !gog->_is_nil() )
727 return "GroupOnGeom";
729 SMESH::SMESH_GroupOnFilter_var gof = SMESH::SObjectToInterface<SMESH::SMESH_GroupOnFilter>(SO);
730 if ( !gof->_is_nil() )
731 return "GroupOnFilter";