src/Model/Model_Objects.cpp

   1 // Copyright (C) 2014-2017  CEA/DEN, EDF R&D
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or
  18 // email : webmaster.salome@opencascade.com<mailto:webmaster.salome@opencascade.com>
  19 //
  20
  21 #include <Model_Objects.h>
  22 #include <Model_Data.h>
  23 #include <Model_Document.h>
  24 #include <Model_Events.h>
  25 #include <Model_Session.h>
  26 #include <Model_ResultPart.h>
  27 #include <Model_ResultConstruction.h>
  28 #include <Model_ResultBody.h>
  29 #include <Model_ResultCompSolid.h>
  30 #include <Model_ResultGroup.h>
  31 #include <Model_ResultField.h>
  32 #include <Model_ResultParameter.h>
  33 #include <ModelAPI_Validator.h>
  34 #include <ModelAPI_CompositeFeature.h>
  35 #include <ModelAPI_Tools.h>
  36
  37 #include <Events_Loop.h>
  38 #include <Events_InfoMessage.h>
  39
  40 #include <TDataStd_Integer.hxx>
  41 #include <TDataStd_Comment.hxx>
  42 #include <TDF_ChildIDIterator.hxx>
  43 #include <TDataStd_ReferenceArray.hxx>
  44 #include <TDataStd_HLabelArray1.hxx>
  45 #include <TDataStd_Name.hxx>
  46 #include <TDF_Reference.hxx>
  47 #include <TDF_ChildIDIterator.hxx>
  48 #include <TDF_LabelMapHasher.hxx>
  49 #include <TDF_LabelMap.hxx>
  50 #include <TDF_ListIteratorOfLabelList.hxx>
  51
  52 static const std::string& groupNameFoldering(const std::string& theGroupID,
  53                                              const bool theAllowFolder)
  54 {
  55   if (theAllowFolder) {
  56     static const std::string anOutOfFolderName = std::string("__") + ModelAPI_Feature::group();
  57     static const std::string aDummyName;
  58     return theGroupID == ModelAPI_Feature::group() ? anOutOfFolderName : aDummyName;
  59   }
  60   return theGroupID;
  61 }
  62
  63
  64 static const int TAG_OBJECTS = 2;  // tag of the objects sub-tree (features, results)
  65
  66 // feature sub-labels
  67 static const int TAG_FEATURE_ARGUMENTS = 1;  ///< where the arguments are located
  68 static const int TAG_FEATURE_RESULTS = 2;  ///< where the results are located
  69
  70 ///
  71 /// 0:1:2 - where features are located
  72 /// 0:1:2:N:1 - data of the feature N
  73 /// 0:1:2:N:2:K:1 - data of the K result of the feature N
  74
  75 Model_Objects::Model_Objects(TDF_Label theMainLab) : myMain(theMainLab)
  76 {
  77 }
  78
  79 void Model_Objects::setOwner(DocumentPtr theDoc)
  80 {
  81   myDoc = theDoc;
  82   // update all fields and recreate features and result objects if needed
  83   TDF_LabelList aNoUpdated;
  84   synchronizeFeatures(aNoUpdated, true, false, true, true);
  85   myHistory.clear();
  86 }
  87
  88 Model_Objects::~Model_Objects()
  89 {
  90   // delete all features of this document
  91   Events_Loop* aLoop = Events_Loop::loop();
  92   // erase one by one to avoid access from the feature destructor itself from he map
  93   // blocks the flush signals to avoid the temporary objects visualization in the viewer
  94   // they should not be shown in order to do not lose highlight by erasing them
  95   bool isActive = aLoop->activateFlushes(false);
  96
  97   while(!myFeatures.IsEmpty()) {
  98     NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFeaturesIter(myFeatures);
  99     FeaturePtr aFeature = aFeaturesIter.Value();
 100     static Events_ID EVENT_DISP = aLoop->eventByName(EVENT_OBJECT_TO_REDISPLAY);
 101     ModelAPI_EventCreator::get()->sendDeleted(myDoc, ModelAPI_Feature::group());
 102     ModelAPI_EventCreator::get()->sendUpdated(aFeature, EVENT_DISP);
 103     aFeature->removeResults(0, false);
 104     aFeature->erase();
 105     myFeatures.UnBind(aFeaturesIter.Key());
 106   }
 107   while (!myFolders.IsEmpty()) {
 108     NCollection_DataMap<TDF_Label, ObjectPtr>::Iterator aFoldersIter(myFolders);
 109     ObjectPtr aFolder = aFoldersIter.Value();
 110     static Events_ID EVENT_DISP = aLoop->eventByName(EVENT_OBJECT_TO_REDISPLAY);
 111     ModelAPI_EventCreator::get()->sendDeleted(myDoc, ModelAPI_Folder::group());
 112     ModelAPI_EventCreator::get()->sendUpdated(aFolder, EVENT_DISP);
 113     aFolder->erase();
 114     myFolders.UnBind(aFoldersIter.Key());
 115   }
 116   myHistory.clear();
 117   aLoop->activateFlushes(isActive);
 118   // erase update, because features are destroyed and update should not performed for them anywhere
 119   aLoop->eraseMessages(Events_Loop::eventByName(EVENT_OBJECT_CREATED));
 120   aLoop->eraseMessages(Events_Loop::eventByName(EVENT_OBJECT_UPDATED));
 121   // deleted and redisplayed is correctly performed: they know that features are destroyed
 122   aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_DELETED));
 123   aLoop->flush(Events_Loop::eventByName(EVENT_OBJECT_TO_REDISPLAY));
 124
 125 }
 126
 127 /// Appends to the array of references a new referenced label
 128 static void AddToRefArray(TDF_Label& theArrayLab, TDF_Label& theReferenced, TDF_Label& thePrevLab)
 129 {
 130   Handle(TDataStd_ReferenceArray) aRefs;
 131   if (!theArrayLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
 132     aRefs = TDataStd_ReferenceArray::Set(theArrayLab, 0, 0);
 133     aRefs->SetValue(0, theReferenced);
 134   } else {  // extend array by one more element
 135     Handle(TDataStd_HLabelArray1) aNewArray = new TDataStd_HLabelArray1(aRefs->Lower(),
 136                                                                         aRefs->Upper() + 1);
 137     int aPassedPrev = 0; // prev feature is found and passed
 138     if (thePrevLab.IsNull()) { // null means that inserted feature must be the first
 139       aNewArray->SetValue(aRefs->Lower(), theReferenced);
 140       aPassedPrev = 1;
 141     }
 142     for (int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
 143       aNewArray->SetValue(a + aPassedPrev, aRefs->Value(a));
 144       if (!aPassedPrev && aRefs->Value(a).IsEqual(thePrevLab)) {
 145         aPassedPrev = 1;
 146         aNewArray->SetValue(a + 1, theReferenced);
 147       }
 148     }
 149     if (!aPassedPrev) // not found: unknown situation
 150       aNewArray->SetValue(aRefs->Upper() + 1, theReferenced);
 151     aRefs->SetInternalArray(aNewArray);
 152   }
 153 }
 154
 155 void Model_Objects::addFeature(FeaturePtr theFeature, const FeaturePtr theAfterThis)
 156 {
 157   if (!theFeature->isAction()) {  // do not add action to the data model
 158     TDF_Label aFeaturesLab = featuresLabel();
 159     TDF_Label aFeatureLab = aFeaturesLab.NewChild();
 160     // store feature in the features array: before "initData" because in macro features
 161     // in initData it creates new features, appeared later than this
 162     TDF_Label aPrevFeateureLab;
 163     if (theAfterThis.get()) { // searching for the previous feature label
 164       std::shared_ptr<Model_Data> aPrevData =
 165         std::dynamic_pointer_cast<Model_Data>(theAfterThis->data());
 166       if (aPrevData.get()) {
 167         aPrevFeateureLab = aPrevData->label().Father();
 168       }
 169     }
 170     AddToRefArray(aFeaturesLab, aFeatureLab, aPrevFeateureLab);
 171
 172     // keep the feature ID to restore document later correctly
 173     TDataStd_Comment::Set(aFeatureLab, theFeature->getKind().c_str());
 174     myFeatures.Bind(aFeatureLab, theFeature);
 175     // must be before the event sending: for OB the feature is already added
 176     updateHistory(ModelAPI_Feature::group());
 177     // do not change the order:
 178     // initData()
 179     // sendUpdated()
 180     // during python script with fillet constraint feature data should be
 181     // initialized before using it in GUI
 182
 183     // must be after binding to the map because of "Box" macro feature that
 184     // creates other features in "initData"
 185     initData(theFeature, aFeatureLab, TAG_FEATURE_ARGUMENTS);
 186     // event: feature is added, mist be before "initData" to update OB correctly on Duplicate:
 187     // first new part, then the content
 188     static Events_ID anEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
 189     ModelAPI_EventCreator::get()->sendUpdated(theFeature, anEvent);
 190   } else { // make feature has not-null data anyway
 191     theFeature->setData(Model_Data::invalidData());
 192     theFeature->setDoc(myDoc);
 193   }
 194 }
 195
 196 /// Appends to the array of references a new referenced label.
 197 /// If theIndex is not -1, removes element at this index, not theReferenced.
 198 /// \returns the index of removed element
 199 static int RemoveFromRefArray(TDF_Label theArrayLab, TDF_Label theReferenced,
 200   const int theIndex = -1)
 201 {
 202   int aResult = -1;  // no returned
 203   Handle(TDataStd_ReferenceArray) aRefs;
 204   if (theArrayLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
 205     if (aRefs->Length() == 1) {  // just erase an array
 206       if ((theIndex == -1 && aRefs->Value(0) == theReferenced) || theIndex == 0) {
 207         theArrayLab.ForgetAttribute(TDataStd_ReferenceArray::GetID());
 208       }
 209       aResult = 0;
 210     } else {  // reduce the array
 211       Handle(TDataStd_HLabelArray1) aNewArray = new TDataStd_HLabelArray1(aRefs->Lower(),
 212                                                                           aRefs->Upper() - 1);
 213       int aCount = aRefs->Lower();
 214       for (int a = aCount; a <= aRefs->Upper(); a++, aCount++) {
 215         if ((theIndex == -1 && aRefs->Value(a) == theReferenced) || theIndex == a) {
 216           aCount--;
 217           aResult = a;
 218         } else {
 219           aNewArray->SetValue(aCount, aRefs->Value(a));
 220         }
 221       }
 222       aRefs->SetInternalArray(aNewArray);
 223     }
 224   }
 225   return aResult;
 226 }
 227
 228 void Model_Objects::refsToFeature(FeaturePtr theFeature,
 229   std::set<std::shared_ptr<ModelAPI_Feature> >& theRefs, const bool isSendError)
 230 {
 231   // check the feature: it must have no depended objects on it
 232   // the dependencies can be in the feature results
 233   std::list<ResultPtr> aResults;
 234   ModelAPI_Tools::allResults(theFeature, aResults);
 235   std::list<ResultPtr>::const_iterator aResIter = aResults.cbegin();
 236   for (; aResIter != aResults.cend(); aResIter++) {
 237     ResultPtr aResult = (*aResIter);
 238     std::shared_ptr<Model_Data> aData =
 239         std::dynamic_pointer_cast<Model_Data>(aResult->data());
 240     if (aData.get() != NULL) {
 241       const std::set<AttributePtr>& aRefs = aData->refsToMe();
 242       std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin(), aRefLast = aRefs.end();
 243       for (; aRefIt != aRefLast; aRefIt++) {
 244         FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>((*aRefIt)->owner());
 245         if (aFeature.get() != NULL)
 246           theRefs.insert(aFeature);
 247       }
 248     }
 249   }
 250   // the dependencies can be in the feature itself
 251   std::shared_ptr<Model_Data> aData =
 252       std::dynamic_pointer_cast<Model_Data>(theFeature->data());
 253   if (aData.get() && !aData->refsToMe().empty()) {
 254     const std::set<AttributePtr>& aRefs = aData->refsToMe();
 255     std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin(), aRefLast = aRefs.end();
 256     for (; aRefIt != aRefLast; aRefIt++) {
 257       FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>((*aRefIt)->owner());
 258       if (aFeature.get() != NULL)
 259         theRefs.insert(aFeature);
 260     }
 261   }
 262
 263   if (!theRefs.empty() && isSendError) {
 264     Events_InfoMessage("Model_Objects",
 265       "Feature '%1' is used and can not be deleted").arg(theFeature->data()->name()).send();
 266   }
 267 }
 268
 269 void Model_Objects::removeFeature(FeaturePtr theFeature)
 270 {
 271   std::shared_ptr<Model_Data> aData = std::static_pointer_cast<Model_Data>(theFeature->data());
 272   if (aData.get() && aData->isValid()) {
 273     // checking that the sub-element of composite feature is removed: if yes, inform the owner
 274     std::set<std::shared_ptr<ModelAPI_Feature> > aRefs;
 275     refsToFeature(theFeature, aRefs, false);
 276     std::set<std::shared_ptr<ModelAPI_Feature> >::iterator aRefIter = aRefs.begin();
 277     for(; aRefIter != aRefs.end(); aRefIter++) {
 278       std::shared_ptr<ModelAPI_CompositeFeature> aComposite =
 279         std::dynamic_pointer_cast<ModelAPI_CompositeFeature>(*aRefIter);
 280       if (aComposite.get() && aComposite->isSub(theFeature)) {
 281         aComposite->removeFeature(theFeature);
 282       }
 283     }
 284     // this must be before erase since theFeature erasing removes all information about
 285     // the feature results and groups of results
 286     // To reproduce: create sketch, extrusion, remove sketch => constructions tree is not updated
 287     clearHistory(theFeature);
 288     // erase fields
 289     theFeature->erase();
 290
 291     TDF_Label aFeatureLabel = aData->label().Father();
 292     if (myFeatures.IsBound(aFeatureLabel))
 293       myFeatures.UnBind(aFeatureLabel);
 294
 295     static Events_ID EVENT_DISP = Events_Loop::loop()->eventByName(EVENT_OBJECT_TO_REDISPLAY);
 296     ModelAPI_EventCreator::get()->sendUpdated(theFeature, EVENT_DISP);
 297     // erase all attributes under the label of feature
 298     aFeatureLabel.ForgetAllAttributes();
 299     // remove it from the references array
 300     RemoveFromRefArray(featuresLabel(), aFeatureLabel);
 301     // event: feature is deleted
 302     ModelAPI_EventCreator::get()->sendDeleted(theFeature->document(), ModelAPI_Feature::group());
 303     updateHistory(ModelAPI_Feature::group());
 304   }
 305 }
 306
 307 void Model_Objects::eraseAllFeatures()
 308 {
 309   static Events_ID kDispEvent = Events_Loop::loop()->eventByName(EVENT_OBJECT_TO_REDISPLAY);
 310   static const ModelAPI_EventCreator* kCreator = ModelAPI_EventCreator::get();
 311   // make all features invalid (like deleted)
 312   NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFIter(myFeatures);
 313   for(; aFIter.More(); aFIter.Next()) {
 314     FeaturePtr aFeature = aFIter.Value();
 315     std::list<ResultPtr> aResList;
 316     ModelAPI_Tools::allResults(aFeature, aResList);
 317     std::list<ResultPtr>::iterator aRIter = aResList.begin();
 318     for(; aRIter != aResList.end(); aRIter++) {
 319       ResultPtr aRes = *aRIter;
 320       if (aRes && aRes->data()->isValid()) {
 321         kCreator->sendDeleted(myDoc, aRes->groupName());
 322         kCreator->sendUpdated(aRes, kDispEvent);
 323         aRes->setData(aRes->data()->invalidPtr());
 324
 325       }
 326     }
 327     kCreator->sendUpdated(aFeature, kDispEvent);
 328     aFeature->setData(aFeature->data()->invalidPtr());
 329   }
 330   kCreator->sendDeleted(myDoc, ModelAPI_Feature::group());
 331   myFeatures.Clear(); // just remove features without modification of DS
 332   updateHistory(ModelAPI_Feature::group());
 333 }
 334
 335 void Model_Objects::moveFeature(FeaturePtr theMoved, FeaturePtr theAfterThis)
 336 {
 337   TDF_Label aFeaturesLab = featuresLabel();
 338   Handle(TDataStd_ReferenceArray) aRefs;
 339   if (!aFeaturesLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs))
 340     return;
 341   TDF_Label anAfterLab, aMovedLab =
 342     std::dynamic_pointer_cast<Model_Data>(theMoved->data())->label().Father();
 343   if (theAfterThis.get())
 344     anAfterLab = std::dynamic_pointer_cast<Model_Data>(theAfterThis->data())->label().Father();
 345
 346   Handle(TDataStd_HLabelArray1) aNewArray =
 347     new TDataStd_HLabelArray1(aRefs->Lower(), aRefs->Upper());
 348   int aPassedMovedFrom = 0; // the prev feature location is found and passed
 349   int aPassedMovedTo = 0; // the feature is added and this location is passed
 350   if (!theAfterThis.get()) { // null means that inserted feature must be the first
 351     aNewArray->SetValue(aRefs->Lower(), aMovedLab);
 352     aPassedMovedTo = 1;
 353   }
 354   for (int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
 355     if (aPassedMovedTo == 0 && aRefs->Value(a) == anAfterLab) { // add two
 356       aPassedMovedTo++;
 357       aNewArray->SetValue(a - aPassedMovedFrom, anAfterLab);
 358       if (a + 1 - aPassedMovedFrom <= aRefs->Upper())
 359         aNewArray->SetValue(a + 1 - aPassedMovedFrom, aMovedLab);
 360     } else if (aPassedMovedFrom == 0 && aRefs->Value(a) == aMovedLab) { // skip
 361       aPassedMovedFrom++;
 362     } else { // just copy one
 363       if (a - aPassedMovedFrom + aPassedMovedTo <= aRefs->Upper())
 364         aNewArray->SetValue(a - aPassedMovedFrom + aPassedMovedTo, aRefs->Value(a));
 365     }
 366   }
 367   if (!aPassedMovedFrom || !aPassedMovedTo) {// not found: unknown situation
 368     if (!aPassedMovedFrom) {
 369       static std::string aMovedFromError("The moved feature is not found");
 370       Events_InfoMessage("Model_Objects", aMovedFromError).send();
 371     } else {
 372       static std::string aMovedToError("The 'after' feature for movement is not found");
 373       Events_InfoMessage("Model_Objects", aMovedToError).send();
 374     }
 375     return;
 376   }
 377   // store the new array
 378   aRefs->SetInternalArray(aNewArray);
 379   // update the feature and the history
 380   clearHistory(theMoved);
 381   // make sure all (selection) attributes of moved feature will be updated
 382   static Events_ID kUpdateSelection = Events_Loop::loop()->eventByName(EVENT_UPDATE_SELECTION);
 383   ModelAPI_EventCreator::get()->sendUpdated(theMoved, kUpdateSelection, false);
 384   ModelAPI_EventCreator::get()->sendReordered(theMoved);
 385 }
 386
 387 void Model_Objects::clearHistory(ObjectPtr theObj)
 388 {
 389   if (theObj.get()) {
 390     const std::string aGroup = theObj->groupName();
 391     updateHistory(aGroup);
 392
 393     if (theObj->groupName() == ModelAPI_Feature::group()) { // clear results group of the feature
 394       FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theObj);
 395       std::string aResultGroup = featureResultGroup(aFeature);
 396       if (!aResultGroup.empty()) {
 397         std::map<std::string, std::vector<ObjectPtr> >::iterator aHIter =
 398           myHistory.find(aResultGroup);
 399         if (aHIter != myHistory.end())
 400           myHistory.erase(aHIter); // erase from map => this means that it is not synchronized
 401       }
 402     }
 403   }
 404 }
 405
 406 void Model_Objects::createHistory(const std::string& theGroupID)
 407 {
 408   std::map<std::string, std::vector<ObjectPtr> >::iterator aHIter = myHistory.find(theGroupID);
 409   if (aHIter == myHistory.end()) {
 410     std::vector<ObjectPtr> aResult;
 411     std::vector<ObjectPtr> aResultOutOfFolder;
 412     FeaturePtr aLastFeatureInFolder;
 413     // iterate the array of references and get feature by feature from the array
 414     bool isFeature = theGroupID == ModelAPI_Feature::group();
 415     bool isFolder = theGroupID == ModelAPI_Folder::group();
 416     Handle(TDataStd_ReferenceArray) aRefs;
 417     if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
 418       for(int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
 419         FeaturePtr aFeature = feature(aRefs->Value(a));
 420         if (aFeature.get()) {
 421           // if feature is in sub-component, remove it from history:
 422           // it is in sub-tree of sub-component
 423           bool isSub = ModelAPI_Tools::compositeOwner(aFeature).get() != NULL;
 424           if (isFeature) { // here may be also disabled features
 425             if (!isSub && aFeature->isInHistory()) {
 426               aResult.push_back(aFeature);
 427               // the feature is out of the folders
 428               if (aLastFeatureInFolder.get() == NULL)
 429                 aResultOutOfFolder.push_back(aFeature);
 430             }
 431           } else if (!aFeature->isDisabled()) { // iterate all results of not-disabled feature
 432             // construction results of sub-features should not be in the tree
 433             if (!isSub || theGroupID != ModelAPI_ResultConstruction::group()) {
 434               // do not use reference to the list here since results can be changed by "isConcealed"
 435               const std::list<std::shared_ptr<ModelAPI_Result> > aResults = aFeature->results();
 436               std::list<std::shared_ptr<ModelAPI_Result> >::const_iterator
 437                 aRIter = aResults.begin();
 438               for (; aRIter != aResults.cend(); aRIter++) {
 439                 ResultPtr aRes = *aRIter;
 440                 if (aRes->groupName() != theGroupID) break; // feature have only same group results
 441                 if (!aRes->isDisabled() && aRes->isInHistory() && !aRes->isConcealed()) {
 442                   aResult.push_back(*aRIter);
 443                 }
 444               }
 445             }
 446           }
 447
 448           // the feature closes the folder, so the next features will be treated as out-of-folder
 449           if (aLastFeatureInFolder.get() && aLastFeatureInFolder == aFeature)
 450             aLastFeatureInFolder = FeaturePtr();
 451
 452         } else {
 453           // it may be a folder
 454           ObjectPtr aFolder = folder(aRefs->Value(a));
 455           if (aFolder.get()) {
 456             // store folder information for the Features group only
 457             if (isFeature || isFolder) {
 458               aResult.push_back(aFolder);
 459               if (!isFolder)
 460                 aResultOutOfFolder.push_back(aFolder);
 461             }
 462
 463             // get the last feature in the folder
 464             AttributeReferencePtr aLastFeatAttr =
 465                 aFolder->data()->reference(ModelAPI_Folder::LAST_FEATURE_ID());
 466             if (aLastFeatAttr)
 467               aLastFeatureInFolder = ModelAPI_Feature::feature(aLastFeatAttr->value());
 468           }
 469         }
 470       }
 471     }
 472     // to be sure that isConcealed did not update the history (issue 1089) during the iteration
 473     if (myHistory.find(theGroupID) == myHistory.end()) {
 474       myHistory[theGroupID] = aResult;
 475
 476       // store the features placed out of any folder
 477       const std::string& anOutOfFolderGroupID = groupNameFoldering(theGroupID, true);
 478       if (!anOutOfFolderGroupID.empty())
 479         myHistory[anOutOfFolderGroupID] = aResultOutOfFolder;
 480     }
 481   }
 482 }
 483
 484 void Model_Objects::updateHistory(const std::shared_ptr<ModelAPI_Object> theObject)
 485 {
 486   clearHistory(theObject);
 487 }
 488
 489 void Model_Objects::updateHistory(const std::string theGroup)
 490 {
 491   std::map<std::string, std::vector<ObjectPtr> >::iterator aHIter = myHistory.find(theGroup);
 492   if (aHIter != myHistory.end()) {
 493     myHistory.erase(aHIter); // erase from map => this means that it is not synchronized
 494
 495     // erase history for the group of objects placed out of any folder
 496     const std::string& anOutOfFolderGroupID = groupNameFoldering(theGroup, true);
 497     if (!anOutOfFolderGroupID.empty())
 498       myHistory.erase(anOutOfFolderGroupID);
 499   }
 500 }
 501
 502 ObjectPtr Model_Objects::folder(TDF_Label theLabel) const
 503 {
 504   if (myFolders.IsBound(theLabel))
 505     return myFolders.Find(theLabel);
 506   return ObjectPtr();
 507 }
 508
 509 FeaturePtr Model_Objects::feature(TDF_Label theLabel) const
 510 {
 511   if (myFeatures.IsBound(theLabel))
 512     return myFeatures.Find(theLabel);
 513   return FeaturePtr();  // not found
 514 }
 515
 516 ObjectPtr Model_Objects::object(TDF_Label theLabel)
 517 {
 518   // try feature by label
 519   FeaturePtr aFeature = feature(theLabel);
 520   if (aFeature.get())
 521     return feature(theLabel);
 522   TDF_Label aFeatureLabel = theLabel.Father().Father();  // let's suppose it is result
 523   aFeature = feature(aFeatureLabel);
 524   bool isSubResult = false;
 525   if (!aFeature.get() && aFeatureLabel.Depth() > 1) { // let's suppose this is sub-result of result
 526     aFeatureLabel = aFeatureLabel.Father().Father();
 527     aFeature = feature(aFeatureLabel);
 528     isSubResult = true;
 529   }
 530   if (aFeature.get()) {
 531     const std::list<std::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
 532     std::list<std::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.cbegin();
 533     for (; aRIter != aResults.cend(); aRIter++) {
 534       if (isSubResult) {
 535         ResultCompSolidPtr aCompRes = std::dynamic_pointer_cast<ModelAPI_ResultCompSolid>(*aRIter);
 536         if (aCompRes.get()) {
 537           int aNumSubs = aCompRes->numberOfSubs();
 538           for(int a = 0; a < aNumSubs; a++) {
 539             ResultPtr aSub = aCompRes->subResult(a);
 540             if (aSub.get()) {
 541               std::shared_ptr<Model_Data> aSubData = std::dynamic_pointer_cast<Model_Data>(
 542                   aSub->data());
 543               if (aSubData->label().Father().IsEqual(theLabel))
 544                 return aSub;
 545             }
 546           }
 547         }
 548       } else {
 549         std::shared_ptr<Model_Data> aResData = std::dynamic_pointer_cast<Model_Data>(
 550             (*aRIter)->data());
 551         if (aResData->label().Father().IsEqual(theLabel))
 552           return *aRIter;
 553       }
 554     }
 555   }
 556   return FeaturePtr();  // not found
 557 }
 558
 559 ObjectPtr Model_Objects::object(const std::string& theGroupID,
 560                                 const int theIndex,
 561                                 const bool theAllowFolder)
 562 {
 563   if (theIndex == -1)
 564     return ObjectPtr();
 565   createHistory(theGroupID);
 566   const std::string& aGroupID = groupNameFoldering(theGroupID, theAllowFolder);
 567   return aGroupID.empty() ? myHistory[theGroupID][theIndex] : myHistory[aGroupID][theIndex];
 568 }
 569
 570 std::shared_ptr<ModelAPI_Object> Model_Objects::objectByName(
 571     const std::string& theGroupID, const std::string& theName)
 572 {
 573   createHistory(theGroupID);
 574   if (theGroupID == ModelAPI_Feature::group()) { // searching among features (in history or not)
 575     std::list<std::shared_ptr<ModelAPI_Feature> > allObjs = allFeatures();
 576     std::list<std::shared_ptr<ModelAPI_Feature> >::iterator anObjIter = allObjs.begin();
 577     for(; anObjIter != allObjs.end(); anObjIter++) {
 578       if ((*anObjIter)->data()->name() == theName)
 579         return *anObjIter;
 580     }
 581   } else { // searching among results (concealed or not)
 582     std::list<std::shared_ptr<ModelAPI_Feature> > allObjs = allFeatures();
 583     std::list<std::shared_ptr<ModelAPI_Feature> >::iterator anObjIter = allObjs.begin();
 584     for(; anObjIter != allObjs.end(); anObjIter++) {
 585       const std::list<std::shared_ptr<ModelAPI_Result> >& aResults = (*anObjIter)->results();
 586       std::list<std::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.cbegin();
 587       for (; aRIter != aResults.cend(); aRIter++) {
 588         if (aRIter->get() && (*aRIter)->groupName() == theGroupID) {
 589           if ((*aRIter)->data()->name() == theName)
 590             return *aRIter;
 591           ResultCompSolidPtr aCompRes =
 592             std::dynamic_pointer_cast<ModelAPI_ResultCompSolid>(*aRIter);
 593           if (aCompRes.get()) {
 594             int aNumSubs = aCompRes->numberOfSubs();
 595             for(int a = 0; a < aNumSubs; a++) {
 596               ResultPtr aSub = aCompRes->subResult(a);
 597               if (aSub.get() && aSub->groupName() == theGroupID) {
 598                 if (aSub->data()->name() == theName)
 599                   return aSub;
 600               }
 601             }
 602           }
 603         }
 604       }
 605     }
 606   }
 607   // not found
 608   return ObjectPtr();
 609 }
 610
 611 const int Model_Objects::index(std::shared_ptr<ModelAPI_Object> theObject,
 612                                const bool theAllowFolder)
 613 {
 614   std::string aGroup = theObject->groupName();
 615   // treat folder as feature
 616   if (aGroup == ModelAPI_Folder::group())
 617     aGroup = ModelAPI_Feature::group();
 618   createHistory(aGroup);
 619
 620   // get the group of features out of folder (if enabled)
 621   if (theAllowFolder && !groupNameFoldering(aGroup, theAllowFolder).empty())
 622     aGroup = groupNameFoldering(aGroup, theAllowFolder);
 623
 624   std::vector<ObjectPtr>& allObjs = myHistory[aGroup];
 625   std::vector<ObjectPtr>::iterator anObjIter = allObjs.begin(); // iterate to search object
 626   for(int anIndex = 0; anObjIter != allObjs.end(); anObjIter++, anIndex++) {
 627     if ((*anObjIter) == theObject)
 628       return anIndex;
 629   }
 630   // not found
 631   return -1;
 632 }
 633
 634 int Model_Objects::size(const std::string& theGroupID, const bool theAllowFolder)
 635 {
 636   createHistory(theGroupID);
 637   const std::string& aGroupID = groupNameFoldering(theGroupID, theAllowFolder);
 638   return aGroupID.empty() ? int(myHistory[theGroupID].size()) : int(myHistory[aGroupID].size());
 639 }
 640
 641 void Model_Objects::allResults(const std::string& theGroupID, std::list<ResultPtr>& theResults)
 642 {
 643   // iterate the array of references and get feature by feature from the array
 644   Handle(TDataStd_ReferenceArray) aRefs;
 645   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
 646     for(int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
 647       FeaturePtr aFeature = feature(aRefs->Value(a));
 648       if (aFeature.get()) {
 649         const std::list<std::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
 650         std::list<std::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
 651         for (; aRIter != aResults.cend(); aRIter++) {
 652           ResultPtr aRes = *aRIter;
 653           if (aRes->groupName() != theGroupID) break; // feature have only same group results
 654           // iterate also concealed: ALL RESULTS (for translation parts undo/redo management)
 655           //if (aRes->isInHistory() && !aRes->isConcealed()) {
 656             theResults.push_back(*aRIter);
 657           //}
 658         }
 659       }
 660     }
 661   }
 662 }
 663
 664
 665 TDF_Label Model_Objects::featuresLabel() const
 666 {
 667   return myMain.FindChild(TAG_OBJECTS);
 668 }
 669
 670 static std::string composeName(const std::string& theFeatureKind, const int theIndex)
 671 {
 672   std::stringstream aNameStream;
 673   aNameStream << theFeatureKind << "_" << theIndex;
 674   return aNameStream.str();
 675 }
 676
 677 void Model_Objects::setUniqueName(FeaturePtr theFeature)
 678 {
 679   if (!theFeature->data()->name().empty())
 680     return;  // not needed, name is already defined
 681   std::string aName;  // result
 682   // first count all features of such kind to start with index = count + 1
 683   int aNumObjects = -1; // this feature is already in this map
 684   NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFIter(myFeatures);
 685   for (; aFIter.More(); aFIter.Next()) {
 686     if (aFIter.Value()->getKind() == theFeature->getKind())
 687       aNumObjects++;
 688   }
 689   // generate candidate name
 690   aName = composeName(theFeature->getKind(), aNumObjects + 1);
 691   // check this is unique, if not, increase index by 1
 692   for (aFIter.Initialize(myFeatures); aFIter.More();) {
 693     FeaturePtr aFeature = aFIter.Value();
 694     bool isSameName = aFeature->data()->name() == aName;
 695     if (!isSameName) {  // check also results to avoid same results names (actual for Parts)
 696       const std::list<std::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
 697       std::list<std::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
 698       for (; aRIter != aResults.cend(); aRIter++) {
 699         isSameName = (*aRIter)->data()->name() == aName;
 700       }
 701     }
 702
 703     if (isSameName) {
 704       aNumObjects++;
 705       aName = composeName(theFeature->getKind(), aNumObjects + 1);
 706       // reinitialize iterator to make sure a new name is unique
 707       aFIter.Initialize(myFeatures);
 708     } else
 709       aFIter.Next();
 710   }
 711   theFeature->data()->setName(aName);
 712 }
 713
 714 void Model_Objects::setUniqueName(FolderPtr theFolder)
 715 {
 716   if (!theFolder->name().empty())
 717     return; // name is already defined
 718
 719   int aNbFolders = myFolders.Size();
 720   std::string aName = composeName(ModelAPI_Folder::ID(), aNbFolders);
 721
 722   // check the uniqueness of the name
 723   NCollection_DataMap<TDF_Label, ObjectPtr>::Iterator anIt(myFolders);
 724   while (anIt.More()) {
 725     if (anIt.Value()->data()->name() == aName) {
 726       aName = composeName(ModelAPI_Folder::ID(), aNbFolders);
 727       // reinitialize iterator to make sure a new name is unique
 728       anIt.Initialize(myFolders);
 729     } else
 730       anIt.Next();
 731   }
 732
 733   theFolder->data()->setName(aName);
 734 }
 735
 736 void Model_Objects::initData(ObjectPtr theObj, TDF_Label theLab, const int theTag)
 737 {
 738   std::shared_ptr<Model_Data> aData(new Model_Data);
 739   aData->setLabel(theLab.FindChild(theTag));
 740   aData->setObject(theObj);
 741   theObj->setDoc(myDoc);
 742   theObj->setData(aData);
 743   FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theObj);
 744   if (aFeature.get()) {
 745     setUniqueName(aFeature);  // must be before "initAttributes" because duplicate part uses name
 746   } else { // is it a folder?
 747     FolderPtr aFolder = std::dynamic_pointer_cast<ModelAPI_Folder>(theObj);
 748     if (aFolder)
 749       setUniqueName(aFolder);
 750   }
 751   theObj->initAttributes();
 752 }
 753
 754 std::shared_ptr<ModelAPI_Feature> Model_Objects::featureById(const int theId)
 755 {
 756   if (theId > 0) {
 757     TDF_Label aLab = featuresLabel().FindChild(theId, Standard_False);
 758     return feature(aLab);
 759   }
 760   return std::shared_ptr<ModelAPI_Feature>(); // not found
 761 }
 762
 763 void Model_Objects::synchronizeFeatures(
 764   const TDF_LabelList& theUpdated, const bool theUpdateReferences,
 765   const bool theExecuteFeatures, const bool theOpen, const bool theFlush)
 766 {
 767   Model_Document* anOwner = std::dynamic_pointer_cast<Model_Document>(myDoc).get();
 768   if (!anOwner) // this may happen on creation of document: nothing there, so nothing to synchronize
 769     return;
 770   // after all updates, sends a message that groups of features were created or updated
 771   Events_Loop* aLoop = Events_Loop::loop();
 772   static Events_ID aDispEvent = aLoop->eventByName(EVENT_OBJECT_TO_REDISPLAY);
 773   static Events_ID aCreateEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
 774   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 775   static Events_ID aRedispEvent = aLoop->eventByName(EVENT_OBJECT_TO_REDISPLAY);
 776   static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
 777   static Events_ID aToHideEvent = aLoop->eventByName(EVENT_OBJECT_TO_REDISPLAY);
 778   bool isActive = aLoop->activateFlushes(false);
 779
 780   // collect all updated labels map
 781   TDF_LabelMap anUpdatedMap;
 782   TDF_ListIteratorOfLabelList anUpdatedIter(theUpdated);
 783   for(; anUpdatedIter.More(); anUpdatedIter.Next()) {
 784     TDF_Label& aFeatureLab = anUpdatedIter.Value();
 785     while(aFeatureLab.Depth() > 3)
 786       aFeatureLab = aFeatureLab.Father();
 787     if (myFeatures.IsBound(aFeatureLab) || myFolders.IsBound(aFeatureLab))
 788       anUpdatedMap.Add(aFeatureLab);
 789   }
 790
 791   // update all objects by checking are they on labels or not
 792   std::set<ObjectPtr> aNewFeatures, aKeptFeatures;
 793   TDF_ChildIDIterator aLabIter(featuresLabel(), TDataStd_Comment::GetID());
 794   for (; aLabIter.More(); aLabIter.Next()) {
 795     TDF_Label aFeatureLabel = aLabIter.Value()->Label();
 796     if (!myFeatures.IsBound(aFeatureLabel) && !myFolders.IsBound(aFeatureLabel)) {
 797       // a new feature or folder is inserted
 798
 799       std::string aFeatureID = TCollection_AsciiString(Handle(TDataStd_Comment)::DownCast(
 800                                aLabIter.Value())->Get()).ToCString();
 801       bool isFolder = aFeatureID == ModelAPI_Folder::ID();
 802
 803       std::shared_ptr<Model_Session> aSession =
 804           std::dynamic_pointer_cast<Model_Session>(ModelAPI_Session::get());
 805
 806       // create a feature
 807       ObjectPtr aFeature = isFolder ? ObjectPtr(new ModelAPI_Folder)
 808                                     : ObjectPtr(aSession->createFeature(aFeatureID, anOwner));
 809       if (!aFeature.get()) {
 810         // somethig is wrong, most probably, the opened document has invalid structure
 811         Events_InfoMessage("Model_Objects", "Invalid type of object in the document").send();
 812         aLabIter.Value()->Label().ForgetAllAttributes();
 813         continue;
 814       }
 815       aFeature->init();
 816       // this must be before "setData" to redo the sketch line correctly
 817       if (isFolder)
 818         myFolders.Bind(aFeatureLabel, aFeature);
 819       else
 820         myFeatures.Bind(aFeatureLabel, std::dynamic_pointer_cast<ModelAPI_Feature>(aFeature));
 821       aNewFeatures.insert(aFeature);
 822       initData(aFeature, aFeatureLabel, TAG_FEATURE_ARGUMENTS);
 823       updateHistory(aFeature);
 824
 825       // event: model is updated
 826       ModelAPI_EventCreator::get()->sendUpdated(aFeature, aCreateEvent);
 827     } else {  // nothing is changed, both iterators are incremented
 828       ObjectPtr anObject;
 829       FeaturePtr aFeature;
 830       if (myFeatures.Find(aFeatureLabel, aFeature)) {
 831         aKeptFeatures.insert(aFeature);
 832         anObject = aFeature;
 833       } else
 834         if (myFolders.Find(aFeatureLabel, anObject))
 835           aKeptFeatures.insert(anObject);
 836
 837       if (anUpdatedMap.Contains(aFeatureLabel)) {
 838         if (!theOpen) { // on abort/undo/redo reinitialize attributes if something is changed
 839           std::list<std::shared_ptr<ModelAPI_Attribute> > anAttrs =
 840             anObject->data()->attributes("");
 841           std::list<std::shared_ptr<ModelAPI_Attribute> >::iterator anAttr = anAttrs.begin();
 842           for(; anAttr != anAttrs.end(); anAttr++)
 843             (*anAttr)->reinit();
 844         }
 845         ModelAPI_EventCreator::get()->sendUpdated(anObject, anUpdateEvent);
 846         if (aFeature && aFeature->getKind() == "Parameter") {
 847           // if parameters are changed, update the results (issue 937)
 848           const std::list<std::shared_ptr<ModelAPI_Result> >& aResults = aFeature->results();
 849           std::list<std::shared_ptr<ModelAPI_Result> >::const_iterator aRIter = aResults.begin();
 850           for (; aRIter != aResults.cend(); aRIter++) {
 851             std::shared_ptr<ModelAPI_Result> aRes = *aRIter;
 852             if (aRes->data()->isValid() && !aRes->isDisabled()) {
 853               ModelAPI_EventCreator::get()->sendUpdated(aRes, anUpdateEvent);
 854             }
 855           }
 856         }
 857       }
 858     }
 859   }
 860
 861   // check all features are checked: if not => it was removed
 862   NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFIter(myFeatures);
 863   while (aFIter.More()) {
 864     if (aKeptFeatures.find(aFIter.Value()) == aKeptFeatures.end()
 865       && aNewFeatures.find(aFIter.Value()) == aNewFeatures.end()) {
 866         FeaturePtr aFeature = aFIter.Value();
 867         // event: model is updated
 868         //if (aFeature->isInHistory()) {
 869         ModelAPI_EventCreator::get()->sendDeleted(myDoc, ModelAPI_Feature::group());
 870         //}
 871         // results of this feature must be redisplayed (hided)
 872         // redisplay also removed feature (used for sketch and AISObject)
 873         ModelAPI_EventCreator::get()->sendUpdated(aFeature, aRedispEvent);
 874         updateHistory(aFeature);
 875         aFeature->erase();
 876
 877         // unbind after the "erase" call: on abort sketch
 878         // is removes sub-objects that corrupts aFIter
 879         myFeatures.UnBind(aFIter.Key());
 880         // reinitialize iterator because unbind may corrupt the previous order in the map
 881         aFIter.Initialize(myFeatures);
 882     } else
 883       aFIter.Next();
 884   }
 885   // verify folders are checked: if not => is was removed
 886   for (NCollection_DataMap<TDF_Label, ObjectPtr>::Iterator aFldIt(myFolders);
 887        aFldIt.More(); aFldIt.Next()) {
 888     ObjectPtr aCurObj = aFldIt.Value();
 889     if (aKeptFeatures.find(aCurObj) == aKeptFeatures.end() &&
 890         aNewFeatures.find(aCurObj) == aNewFeatures.end()) {
 891       ModelAPI_EventCreator::get()->sendDeleted(myDoc, ModelAPI_Folder::group());
 892       // results of this feature must be redisplayed (hided)
 893       // redisplay also removed feature (used for sketch and AISObject)
 894       ModelAPI_EventCreator::get()->sendUpdated(aCurObj, aRedispEvent);
 895       updateHistory(aCurObj);
 896       aCurObj->erase();
 897
 898       // unbind after the "erase" call: on abort sketch
 899       // is removes sub-objects that corrupts aFIter
 900       myFolders.UnBind(aFldIt.Key());
 901       // reinitialize iterator because unbind may corrupt the previous order in the map
 902       aFldIt.Initialize(myFolders);
 903     }
 904   }
 905
 906   if (theUpdateReferences) {
 907     synchronizeBackRefs();
 908   }
 909   // update results of the features (after features created because
 910   // they may be connected, like sketch and sub elements)
 911   // After synchronisation of back references because sketch
 912   // must be set in sub-elements before "execute" by updateResults
 913   std::set<FeaturePtr> aProcessed; // composites must be updated after their subs (issue 360)
 914   TDF_ChildIDIterator aLabIter2(featuresLabel(), TDataStd_Comment::GetID());
 915   for (; aLabIter2.More(); aLabIter2.Next()) {
 916     TDF_Label aFeatureLabel = aLabIter2.Value()->Label();
 917     if (myFeatures.IsBound(aFeatureLabel)) {  // a new feature is inserted
 918       FeaturePtr aFeature = myFeatures.Find(aFeatureLabel);
 919       updateResults(aFeature, aProcessed);
 920     }
 921   }
 922   // the synchronize should be done after updateResults
 923   // in order to correct back references of updated results
 924   if (theUpdateReferences) {
 925     synchronizeBackRefs();
 926   }
 927   if (!theUpdated.IsEmpty()) {
 928     // this means there is no control what was modified => remove history cash
 929     myHistory.clear();
 930   }
 931
 932   if (!theExecuteFeatures)
 933     anOwner->setExecuteFeatures(false);
 934   aLoop->activateFlushes(isActive);
 935
 936   if (theFlush) {
 937     aLoop->flush(aDeleteEvent);
 938     // delete should be emitted before create to reacts to aborted feature
 939     aLoop->flush(aCreateEvent);
 940     aLoop->flush(anUpdateEvent);
 941     aLoop->flush(aCreateEvent); // after update of features, there could be results created
 942     aLoop->flush(aDeleteEvent); // or deleted
 943     aLoop->flush(aRedispEvent);
 944     aLoop->flush(aToHideEvent);
 945   }
 946   if (!theExecuteFeatures)
 947     anOwner->setExecuteFeatures(true);
 948 }
 949
 950 /// synchronises back references for the given object basing on the collected data
 951 void Model_Objects::synchronizeBackRefsForObject(const std::set<AttributePtr>& theNewRefs,
 952   ObjectPtr theObject)
 953 {
 954   if (!theObject.get() || !theObject->data()->isValid())
 955     return; // invalid
 956   std::shared_ptr<Model_Data> aData = std::dynamic_pointer_cast<Model_Data>(theObject->data());
 957   // iterate new list to compare with curent
 958   std::set<AttributePtr>::iterator aNewIter = theNewRefs.begin();
 959   for(; aNewIter != theNewRefs.end(); aNewIter++) {
 960     if (aData->refsToMe().find(*aNewIter) == aData->refsToMe().end()) {
 961       FeaturePtr aRefFeat = std::dynamic_pointer_cast<ModelAPI_Feature>((*aNewIter)->owner());
 962       if (aRefFeat)
 963         aData->addBackReference(aRefFeat, (*aNewIter)->id());
 964       else // add back reference to a folder
 965         aData->addBackReference((*aNewIter)->owner(), (*aNewIter)->id());
 966     }
 967   }
 968   if (theNewRefs.size() != aData->refsToMe().size()) { // some back ref must be removed
 969     std::set<AttributePtr>::iterator aCurrentIter = aData->refsToMe().begin();
 970     while(aCurrentIter != aData->refsToMe().end()) {
 971       if (theNewRefs.find(*aCurrentIter) == theNewRefs.end()) {
 972         // for external references from other documents this system
 973         // is not working: refs are collected from
 974         // different Model_Objects, so before remove check this
 975         // external object exists and still referenced
 976         bool aLeaveIt = false;
 977         if ((*aCurrentIter)->owner().get() && (*aCurrentIter)->owner()->document() != myDoc &&
 978             (*aCurrentIter)->owner()->data().get() && (*aCurrentIter)->owner()->data()->isValid()) {
 979           std::list<std::pair<std::string, std::list<std::shared_ptr<ModelAPI_Object> > > > aRefs;
 980           (*aCurrentIter)->owner()->data()->referencesToObjects(aRefs);
 981           std::list<std::pair<std::string, std::list<std::shared_ptr<ModelAPI_Object> >>>::iterator
 982             aRefIter = aRefs.begin();
 983           for(; aRefIter != aRefs.end(); aRefIter++) {
 984             if ((*aCurrentIter)->id() == aRefIter->first) {
 985               std::list<std::shared_ptr<ModelAPI_Object> >::iterator anOIt;
 986               for(anOIt = aRefIter->second.begin(); anOIt != aRefIter->second.end(); anOIt++) {
 987                 if (*anOIt == theObject) {
 988                   aLeaveIt = true;
 989                 }
 990               }
 991             }
 992           }
 993         }
 994         if (!aLeaveIt) {
 995           aData->removeBackReference(*aCurrentIter);
 996           aCurrentIter = aData->refsToMe().begin(); // reinitialize iteration after delete
 997         } else aCurrentIter++;
 998       } else aCurrentIter++;
 999     }
1000   }
1001   aData->updateConcealmentFlag();
1002 }
1003
1004 static void collectReferences(std::shared_ptr<ModelAPI_Data> theData,
1005                               std::map<ObjectPtr, std::set<AttributePtr> >& theRefs)
1006 {
1007   if (theData.get()) {
1008     std::list<std::pair<std::string, std::list<ObjectPtr> > > aRefs;
1009     theData->referencesToObjects(aRefs);
1010     std::list<std::pair<std::string, std::list<ObjectPtr> > >::iterator aRefsIt = aRefs.begin();
1011     for(; aRefsIt != aRefs.end(); aRefsIt++) {
1012       std::list<ObjectPtr>::iterator aRefTo = aRefsIt->second.begin();
1013       for(; aRefTo != aRefsIt->second.end(); aRefTo++) {
1014         if (*aRefTo) {
1015           std::map<ObjectPtr, std::set<AttributePtr> >::iterator aFound = theRefs.find(*aRefTo);
1016           if (aFound == theRefs.end()) {
1017             theRefs[*aRefTo] = std::set<AttributePtr>();
1018             aFound = theRefs.find(*aRefTo);
1019           }
1020           aFound->second.insert(theData->attribute(aRefsIt->first));
1021         }
1022       }
1023     }
1024   }
1025 }
1026
1027 void Model_Objects::synchronizeBackRefs()
1028 {
1029   // collect all back references in the separated container: to update everything at once,
1030   // without additional Concealment switchin on and off: only the final modification
1031
1032   // referenced (slave) objects to referencing attirbutes
1033   std::map<ObjectPtr, std::set<AttributePtr> > allRefs;
1034   NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator aFeatures(myFeatures);
1035   for(; aFeatures.More(); aFeatures.Next()) {
1036     FeaturePtr aFeature = aFeatures.Value();
1037     collectReferences(aFeature->data(), allRefs);
1038   }
1039   NCollection_DataMap<TDF_Label, ObjectPtr>::Iterator aFolders(myFolders);
1040   for(; aFolders.More(); aFolders.Next()) {
1041     ObjectPtr aFolder = aFolders.Value();
1042     collectReferences(aFolder->data(), allRefs);
1043   }
1044   // second iteration: just compare back-references with existing in features and results
1045   for(aFeatures.Initialize(myFeatures); aFeatures.More(); aFeatures.Next()) {
1046     FeaturePtr aFeature = aFeatures.Value();
1047     static std::set<AttributePtr> anEmpty;
1048     std::map<ObjectPtr, std::set<AttributePtr> >::iterator aFound = allRefs.find(aFeature);
1049     if (aFound == allRefs.end()) { // not found => erase all back references
1050       synchronizeBackRefsForObject(anEmpty, aFeature);
1051     } else {
1052       synchronizeBackRefsForObject(aFound->second, aFeature);
1053       allRefs.erase(aFound); // to check that all refs are counted
1054     }
1055     // also for results
1056     std::list<ResultPtr> aResults;
1057     ModelAPI_Tools::allResults(aFeature, aResults);
1058     std::list<ResultPtr>::iterator aRIter = aResults.begin();
1059     for(; aRIter != aResults.cend(); aRIter++) {
1060       aFound = allRefs.find(*aRIter);
1061       if (aFound == allRefs.end()) { // not found => erase all back references
1062         synchronizeBackRefsForObject(anEmpty, *aRIter);
1063       } else {
1064         synchronizeBackRefsForObject(aFound->second, *aRIter);
1065         allRefs.erase(aFound); // to check that all refs are counted
1066       }
1067     }
1068   }
1069   for(aFeatures.Initialize(myFeatures); aFeatures.More(); aFeatures.Next()) {
1070     FeaturePtr aFeature = aFeatures.Value();
1071     std::list<ResultPtr> aResults;
1072     ModelAPI_Tools::allResults(aFeature, aResults);
1073     // update the concealment status for disply in isConcealed of ResultBody
1074     std::list<ResultPtr>::iterator aRIter = aResults.begin();
1075     for(; aRIter != aResults.cend(); aRIter++) {
1076       (*aRIter)->isConcealed();
1077     }
1078   }
1079   // the rest all refs means that feature references to the external document feature:
1080   // process also them
1081   std::map<ObjectPtr, std::set<AttributePtr> >::iterator anExtIter = allRefs.begin();
1082   for(; anExtIter != allRefs.end(); anExtIter++) {
1083     synchronizeBackRefsForObject(anExtIter->second, anExtIter->first);
1084   }
1085 }
1086
1087 TDF_Label Model_Objects::resultLabel(
1088   const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theResultIndex)
1089 {
1090   const std::shared_ptr<Model_Data>& aData =
1091     std::dynamic_pointer_cast<Model_Data>(theFeatureData);
1092   return aData->label().Father().FindChild(TAG_FEATURE_RESULTS).FindChild(theResultIndex + 1);
1093 }
1094
1095 bool Model_Objects::hasCustomName(DataPtr theFeatureData,
1096                                   ResultPtr theResult,
1097                                   int theResultIndex,
1098                                   std::string& theParentName) const
1099 {
1100   ResultCompSolidPtr aCompSolidRes =
1101       std::dynamic_pointer_cast<ModelAPI_ResultCompSolid>(theFeatureData->owner());
1102   if (aCompSolidRes) {
1103     FeaturePtr anOwner = ModelAPI_Feature::feature(theResult->data()->owner());
1104
1105     // names of sub-solids in CompSolid should be default (for example,
1106     // result of boolean operation 'Boolean_1' is a CompSolid which is renamed to 'MyBOOL',
1107     // however, sub-elements of 'MyBOOL' should be named 'Boolean_1_1', 'Boolean_1_2' etc.)
1108     std::ostringstream aDefaultName;
1109     aDefaultName << anOwner->name();
1110     // compute default name of CompSolid (name of feature + index of CompSolid's result)
1111     int aCompSolidResultIndex = 0;
1112     const std::list<ResultPtr>& aResults = anOwner->results();
1113     for (std::list<ResultPtr>::const_iterator anIt = aResults.begin();
1114          anIt != aResults.end(); ++anIt, ++aCompSolidResultIndex)
1115       if (aCompSolidRes == *anIt)
1116         break;
1117     aDefaultName << "_" << (aCompSolidResultIndex + 1);
1118     theParentName = aDefaultName.str();
1119     return false;
1120   }
1121
1122   std::pair<std::string, bool> aName = ModelAPI_Tools::getDefaultName(theResult, theResultIndex);
1123   if (aName.second)
1124     theParentName = aName.first;
1125   return aName.second;
1126 }
1127
1128 void Model_Objects::storeResult(std::shared_ptr<ModelAPI_Data> theFeatureData,
1129                                 std::shared_ptr<ModelAPI_Result> theResult,
1130                                 const int theResultIndex)
1131 {
1132   theResult->init();
1133   theResult->setDoc(myDoc);
1134   initData(theResult, resultLabel(theFeatureData, theResultIndex), TAG_FEATURE_ARGUMENTS);
1135   if (theResult->data()->name().empty()) {
1136     // if was not initialized, generate event and set a name
1137     std::string aNewName = theFeatureData->name();
1138     if (hasCustomName(theFeatureData, theResult, theResultIndex, aNewName)) {
1139       // if the name of result is user-defined, then, at first time, assign name of the result
1140       // by empty string to be sure that corresponding flag in the data model is set
1141       theResult->data()->setName("");
1142     } else {
1143       std::stringstream aName;
1144       aName << aNewName;
1145       // if there are several results (issue #899: any number of result),
1146       // add unique prefix starting from second
1147       if (theResultIndex > 0 || theResult->groupName() == ModelAPI_ResultBody::group())
1148         aName << "_" << theResultIndex + 1;
1149       aNewName = aName.str();
1150     }
1151     theResult->data()->setName(aNewName);
1152   }
1153 }
1154
1155 std::shared_ptr<ModelAPI_ResultConstruction> Model_Objects::createConstruction(
1156     const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
1157 {
1158   TDF_Label aLab = resultLabel(theFeatureData, theIndex);
1159   TDataStd_Comment::Set(aLab, ModelAPI_ResultConstruction::group().c_str());
1160   ObjectPtr anOldObject = object(aLab);
1161   std::shared_ptr<ModelAPI_ResultConstruction> aResult;
1162   if (anOldObject.get()) {
1163     aResult = std::dynamic_pointer_cast<ModelAPI_ResultConstruction>(anOldObject);
1164   }
1165   if (!aResult.get()) {
1166     aResult = std::shared_ptr<ModelAPI_ResultConstruction>(new Model_ResultConstruction);
1167     storeResult(theFeatureData, aResult, theIndex);
1168   }
1169   return aResult;
1170 }
1171
1172 std::shared_ptr<ModelAPI_ResultBody> Model_Objects::createBody(
1173     const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
1174 {
1175   TDF_Label aLab = resultLabel(theFeatureData, theIndex);
1176   // for feature create compsolid, but for result sub create body:
1177   // only one level of recursion is supported now
1178   ResultPtr aResultOwner = std::dynamic_pointer_cast<ModelAPI_Result>(theFeatureData->owner());
1179   ObjectPtr anOldObject;
1180   if (aResultOwner.get()) {
1181     TDataStd_Comment::Set(aLab, ModelAPI_ResultBody::group().c_str());
1182   } else { // in compsolid (higher level result) old object probably may be found
1183     TDataStd_Comment::Set(aLab, ModelAPI_ResultCompSolid::group().c_str());
1184     anOldObject = object(aLab);
1185   }
1186   std::shared_ptr<ModelAPI_ResultBody> aResult;
1187   if (anOldObject.get()) {
1188     aResult = std::dynamic_pointer_cast<ModelAPI_ResultBody>(anOldObject);
1189   }
1190   if (!aResult.get()) {
1191     // create compsolid anyway; if it is compsolid, it will create sub-bodies internally
1192     if (aResultOwner.get()) {
1193       aResult = std::shared_ptr<ModelAPI_ResultBody>(new Model_ResultBody);
1194     } else {
1195       aResult = std::shared_ptr<ModelAPI_ResultBody>(new Model_ResultCompSolid);
1196     }
1197     storeResult(theFeatureData, aResult, theIndex);
1198   }
1199   return aResult;
1200 }
1201
1202 std::shared_ptr<ModelAPI_ResultPart> Model_Objects::createPart(
1203     const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
1204 {
1205   TDF_Label aLab = resultLabel(theFeatureData, theIndex);
1206   TDataStd_Comment::Set(aLab, ModelAPI_ResultPart::group().c_str());
1207   ObjectPtr anOldObject = object(aLab);
1208   std::shared_ptr<ModelAPI_ResultPart> aResult;
1209   if (anOldObject.get()) {
1210     aResult = std::dynamic_pointer_cast<ModelAPI_ResultPart>(anOldObject);
1211   }
1212   if (!aResult.get()) {
1213     aResult = std::shared_ptr<ModelAPI_ResultPart>(new Model_ResultPart);
1214     storeResult(theFeatureData, aResult, theIndex);
1215   }
1216   return aResult;
1217 }
1218
1219 std::shared_ptr<ModelAPI_ResultPart> Model_Objects::copyPart(
1220     const std::shared_ptr<ModelAPI_ResultPart>& theOrigin,
1221     const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
1222 {
1223   std::shared_ptr<ModelAPI_ResultPart> aResult = createPart(theFeatureData, theIndex);
1224   aResult->data()->reference(Model_ResultPart::BASE_REF_ID())->setValue(theOrigin);
1225   return aResult;
1226 }
1227
1228 std::shared_ptr<ModelAPI_ResultGroup> Model_Objects::createGroup(
1229     const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
1230 {
1231   TDF_Label aLab = resultLabel(theFeatureData, theIndex);
1232   TDataStd_Comment::Set(aLab, ModelAPI_ResultGroup::group().c_str());
1233   ObjectPtr anOldObject = object(aLab);
1234   std::shared_ptr<ModelAPI_ResultGroup> aResult;
1235   if (anOldObject.get()) {
1236     aResult = std::dynamic_pointer_cast<ModelAPI_ResultGroup>(anOldObject);
1237   }
1238   if (!aResult.get()) {
1239     aResult = std::shared_ptr<ModelAPI_ResultGroup>(new Model_ResultGroup(theFeatureData));
1240     storeResult(theFeatureData, aResult, theIndex);
1241   }
1242   return aResult;
1243 }
1244
1245 std::shared_ptr<ModelAPI_ResultField> Model_Objects::createField(
1246     const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
1247 {
1248   TDF_Label aLab = resultLabel(theFeatureData, theIndex);
1249   TDataStd_Comment::Set(aLab, ModelAPI_ResultField::group().c_str());
1250   ObjectPtr anOldObject = object(aLab);
1251   std::shared_ptr<ModelAPI_ResultField> aResult;
1252   if (anOldObject.get()) {
1253     aResult = std::dynamic_pointer_cast<ModelAPI_ResultField>(anOldObject);
1254   }
1255   if (!aResult.get()) {
1256     aResult = std::shared_ptr<ModelAPI_ResultField>(new Model_ResultField(theFeatureData));
1257     storeResult(theFeatureData, aResult, theIndex);
1258   }
1259   return aResult;
1260 }
1261
1262 std::shared_ptr<ModelAPI_ResultParameter> Model_Objects::createParameter(
1263       const std::shared_ptr<ModelAPI_Data>& theFeatureData, const int theIndex)
1264 {
1265   TDF_Label aLab = resultLabel(theFeatureData, theIndex);
1266   TDataStd_Comment::Set(aLab, ModelAPI_ResultParameter::group().c_str());
1267   ObjectPtr anOldObject = object(aLab);
1268   std::shared_ptr<ModelAPI_ResultParameter> aResult;
1269   if (anOldObject.get()) {
1270     aResult = std::dynamic_pointer_cast<ModelAPI_ResultParameter>(anOldObject);
1271   }
1272   if (!aResult.get()) {
1273     aResult = std::shared_ptr<ModelAPI_ResultParameter>(new Model_ResultParameter);
1274     storeResult(theFeatureData, aResult, theIndex);
1275   }
1276   return aResult;
1277 }
1278
1279 std::shared_ptr<ModelAPI_Folder> Model_Objects::createFolder(
1280     const std::shared_ptr<ModelAPI_Feature>& theBeforeThis)
1281 {
1282   FolderPtr aFolder(new ModelAPI_Folder);
1283   if (!aFolder)
1284     return aFolder;
1285
1286   TDF_Label aFeaturesLab = featuresLabel();
1287   TDF_Label aFolderLab = aFeaturesLab.NewChild();
1288   // store feature in the features array: before "initData" because in macro features
1289   // in initData it creates new features, appeared later than this
1290   TDF_Label aPrevFeatureLab;
1291   if (theBeforeThis.get()) { // searching for the previous feature label
1292     std::shared_ptr<Model_Data> aPrevData =
1293         std::dynamic_pointer_cast<Model_Data>(theBeforeThis->data());
1294     if (aPrevData.get()) {
1295       aPrevFeatureLab = nextLabel(aPrevData->label().Father(), true);
1296     }
1297   } else { // find the label of the last feature
1298     Handle(TDataStd_ReferenceArray) aRefs;
1299     if (aFeaturesLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs))
1300       aPrevFeatureLab = aRefs->Value(aRefs->Upper());
1301   }
1302   AddToRefArray(aFeaturesLab, aFolderLab, aPrevFeatureLab);
1303
1304   // keep the feature ID to restore document later correctly
1305   TDataStd_Comment::Set(aFolderLab, ModelAPI_Folder::ID().c_str());
1306   myFolders.Bind(aFolderLab, aFolder);
1307   // must be before the event sending: for OB the feature is already added
1308   updateHistory(ModelAPI_Folder::group());
1309   updateHistory(ModelAPI_Feature::group());
1310
1311   // must be after binding to the map because of "Box" macro feature that
1312   // creates other features in "initData"
1313   initData(aFolder, aFolderLab, TAG_FEATURE_ARGUMENTS);
1314   // event: folder is added, must be before "initData" to update OB correctly on Duplicate:
1315   // first new part, then the content
1316   static Events_ID anEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
1317   ModelAPI_EventCreator::get()->sendUpdated(aFolder, anEvent);
1318
1319   return aFolder;
1320 }
1321
1322 void Model_Objects::removeFolder(std::shared_ptr<ModelAPI_Folder> theFolder)
1323 {
1324   std::shared_ptr<Model_Data> aData = std::static_pointer_cast<Model_Data>(theFolder->data());
1325   if (!aData.get() || !aData->isValid())
1326     return;
1327
1328   // this must be before erase since theFolder erasing removes all information about it
1329   clearHistory(theFolder);
1330   // erase fields
1331   theFolder->erase();
1332
1333   TDF_Label aFolderLabel = aData->label().Father();
1334   if (myFolders.IsBound(aFolderLabel))
1335     myFolders.UnBind(aFolderLabel);
1336
1337   static Events_ID EVENT_DISP = Events_Loop::loop()->eventByName(EVENT_OBJECT_TO_REDISPLAY);
1338   ModelAPI_EventCreator::get()->sendUpdated(theFolder, EVENT_DISP);
1339   // erase all attributes under the label of feature
1340   aFolderLabel.ForgetAllAttributes();
1341   // remove it from the references array
1342   RemoveFromRefArray(featuresLabel(), aFolderLabel);
1343   // event: feature is deleted
1344   ModelAPI_EventCreator::get()->sendDeleted(theFolder->document(), ModelAPI_Folder::group());
1345   updateHistory(ModelAPI_Folder::group());
1346   updateHistory(ModelAPI_Feature::group());
1347 }
1348
1349 // Returns one of the limiting features of the list
1350 static FeaturePtr limitingFeature(std::list<FeaturePtr>& theFeatures, const bool isLast)
1351 {
1352   FeaturePtr aFeature;
1353   if (isLast) {
1354     aFeature = theFeatures.back();
1355     theFeatures.pop_back();
1356   } else {
1357     aFeature = theFeatures.front();
1358     theFeatures.pop_front();
1359   }
1360   return aFeature;
1361 }
1362
1363 // Verify the feature is sub-element in composite feature or it is not used in the history
1364 static bool isSkippedFeature(FeaturePtr theFeature)
1365 {
1366   bool isSub = ModelAPI_Tools::compositeOwner(theFeature).get() != NULL;
1367   return isSub || (theFeature && !theFeature->isInHistory());
1368 }
1369
1370 std::shared_ptr<ModelAPI_Folder> Model_Objects::findFolder(
1371       const std::list<std::shared_ptr<ModelAPI_Feature> >& theFeatures,
1372       const bool theBelow)
1373 {
1374   if (theFeatures.empty())
1375     return FolderPtr(); // nothing to move
1376
1377   TDF_Label aFeaturesLab = featuresLabel();
1378   Handle(TDataStd_ReferenceArray) aRefs;
1379   if (!aFeaturesLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs))
1380     return FolderPtr(); // no reference array (something is wrong)
1381
1382   std::list<std::shared_ptr<ModelAPI_Feature> > aFeatures = theFeatures;
1383   std::shared_ptr<ModelAPI_Feature> aLimitingFeature = limitingFeature(aFeatures, theBelow);
1384
1385   std::shared_ptr<Model_Data> aData =
1386       std::static_pointer_cast<Model_Data>(aLimitingFeature->data());
1387   if (!aData || !aData->isValid())
1388     return FolderPtr(); // invalid feature
1389
1390   // label of the first feature in the list for fast searching
1391   TDF_Label aFirstFeatureLabel = aData->label().Father();
1392
1393   // find a folder above the features and
1394   // check the given features represent a sequential list of objects following the folder
1395   FolderPtr aFoundFolder;
1396   TDF_Label aLastFeatureInFolder;
1397   int aRefIndex = aRefs->Lower();
1398   for(; aRefIndex <= aRefs->Upper(); ++aRefIndex) { // iterate all existing features
1399     TDF_Label aCurLabel = aRefs->Value(aRefIndex);
1400     if (IsEqual(aCurLabel, aFirstFeatureLabel))
1401       break; // no need to continue searching
1402
1403     // searching the folder below, just continue to search last feature from the list
1404     if (theBelow)
1405       continue;
1406
1407     // if feature is in sub-component, skip it
1408     FeaturePtr aCurFeature = feature(aCurLabel);
1409     if (isSkippedFeature(aCurFeature))
1410       continue;
1411
1412     if (!aLastFeatureInFolder.IsNull()) {
1413       if (IsEqual(aCurLabel, aLastFeatureInFolder))
1414         aLastFeatureInFolder.Nullify(); // the last feature in the folder is achived
1415       continue;
1416     }
1417
1418     aFoundFolder = std::dynamic_pointer_cast<ModelAPI_Folder>(folder(aCurLabel));
1419     if (aFoundFolder) {
1420       AttributeReferencePtr aLastFeatAttr =
1421           aFoundFolder->reference(ModelAPI_Folder::LAST_FEATURE_ID());
1422       if (aLastFeatAttr) {
1423         // setup iterating inside a folder to find last feature
1424         ObjectPtr aLastFeature = aLastFeatAttr->value();
1425         if (aLastFeature) {
1426           aData = std::static_pointer_cast<Model_Data>(aLastFeature->data());
1427           if (aData && aData->isValid())
1428             aLastFeatureInFolder = aData->label().Father();
1429         }
1430       }
1431     }
1432   }
1433
1434   if (theBelow && aRefIndex < aRefs->Upper()) {
1435     TDF_Label aLabel;
1436     // skip following features which are sub-components or not in history
1437     for (int anIndex = aRefIndex + 1; anIndex <= aRefs->Upper(); ++anIndex) {
1438       aLabel = aRefs->Value(anIndex);
1439       FeaturePtr aCurFeature = feature(aLabel);
1440       if (!isSkippedFeature(aCurFeature))
1441         break;
1442     }
1443     // check the next object is a folder
1444     aFoundFolder = std::dynamic_pointer_cast<ModelAPI_Folder>(folder(aLabel));
1445   }
1446
1447   if (!aLastFeatureInFolder.IsNull() || // the last feature of the folder above is not found
1448       !aFoundFolder)
1449     return FolderPtr();
1450
1451   // check the given features are sequential list
1452   int aStep = theBelow ? -1 : 1;
1453   for (aRefIndex += aStep;
1454        !aFeatures.empty() && aRefIndex >= aRefs->Lower() && aRefIndex <= aRefs->Upper();
1455        aRefIndex += aStep) {
1456     TDF_Label aCurLabel = aRefs->Value(aRefIndex);
1457     // if feature is in sub-component, skip it
1458     FeaturePtr aCurFeature = feature(aCurLabel);
1459     if (isSkippedFeature(aCurFeature))
1460       continue;
1461
1462     aLimitingFeature = limitingFeature(aFeatures, theBelow);
1463     if (!aCurFeature->data()->isEqual(aLimitingFeature->data()))
1464       return FolderPtr(); // not a sequential list
1465   }
1466
1467   return aFoundFolder;
1468 }
1469
1470 bool Model_Objects::moveToFolder(
1471       const std::list<std::shared_ptr<ModelAPI_Feature> >& theFeatures,
1472       const std::shared_ptr<ModelAPI_Folder>& theFolder)
1473 {
1474   if (theFeatures.empty() || !theFolder)
1475     return false;
1476
1477   // labels for the folder and last feature in the list
1478   TDF_Label aFolderLabel, aLastFeatureLabel;
1479   std::shared_ptr<Model_Data> aData =
1480       std::static_pointer_cast<Model_Data>(theFolder->data());
1481   if (aData && aData->isValid())
1482     aFolderLabel = aData->label().Father();
1483   aData = std::static_pointer_cast<Model_Data>(theFeatures.back()->data());
1484   if (aData && aData->isValid())
1485     aLastFeatureLabel = aData->label().Father();
1486
1487   if (aFolderLabel.IsNull() || aLastFeatureLabel.IsNull())
1488     return false;
1489
1490   AttributeReferencePtr aFirstFeatAttr =
1491       theFolder->reference(ModelAPI_Folder::FIRST_FEATURE_ID());
1492   AttributeReferencePtr aLastFeatAttr =
1493       theFolder->reference(ModelAPI_Folder::LAST_FEATURE_ID());
1494   bool initFirstAttr = !aFirstFeatAttr->value().get();
1495   bool initLastAttr  = !aLastFeatAttr->value().get();
1496
1497   // check the folder is below the list of features
1498   bool isFolderBelow = false;
1499   TDF_Label aFeaturesLab = featuresLabel();
1500   Handle(TDataStd_ReferenceArray) aRefs;
1501   if (!aFeaturesLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs))
1502     return false; // no reference array (something is wrong)
1503   for (int aRefIndex = aRefs->Lower(); aRefIndex <= aRefs->Upper(); ++aRefIndex) {
1504     TDF_Label aCurLabel = aRefs->Value(aRefIndex);
1505     if (aCurLabel == aFolderLabel)
1506       break; // folder is above the features
1507     else if (aCurLabel == aLastFeatureLabel) {
1508       isFolderBelow = true;
1509       break;
1510     }
1511   }
1512
1513   if (isFolderBelow) {
1514     aData = std::static_pointer_cast<Model_Data>(theFeatures.front()->data());
1515     if (!aData || !aData->isValid())
1516       return false;
1517     TDF_Label aPrevFeatureLabel = aData->label().Father();
1518     // label of the feature before the first feature in the list
1519     for (int aRefIndex = aRefs->Lower(); aRefIndex <= aRefs->Upper(); ++aRefIndex)
1520       if (aPrevFeatureLabel == aRefs->Value(aRefIndex)) {
1521         if (aRefIndex == aRefs->Lower())
1522           aPrevFeatureLabel.Nullify();
1523         else
1524           aPrevFeatureLabel = aRefs->Value(aRefIndex - 1);
1525         break;
1526       }
1527
1528     // move the folder in the list of references before the first feature
1529     RemoveFromRefArray(aFeaturesLab, aFolderLabel);
1530     AddToRefArray(aFeaturesLab, aFolderLabel, aPrevFeatureLabel);
1531     // update first feature of the folder
1532     initFirstAttr = true;
1533   } else {
1534     // update last feature of the folder
1535     initLastAttr = true;
1536   }
1537
1538   if (initFirstAttr)
1539     aFirstFeatAttr->setValue(theFeatures.front());
1540   if (initLastAttr)
1541     aLastFeatAttr->setValue(theFeatures.back());
1542
1543   updateHistory(ModelAPI_Feature::group());
1544   return true;
1545 }
1546
1547 static FolderPtr inFolder(const FeaturePtr& theFeature, const std::string& theFolderAttr)
1548 {
1549   const std::set<AttributePtr>& aRefs = theFeature->data()->refsToMe();
1550   for (std::set<AttributePtr>::iterator anIt = aRefs.begin(); anIt != aRefs.end(); ++anIt) {
1551     if ((*anIt)->id() != theFolderAttr)
1552       continue;
1553
1554     ObjectPtr anOwner = (*anIt)->owner();
1555     FolderPtr aFolder = std::dynamic_pointer_cast<ModelAPI_Folder>(anOwner);
1556     if (aFolder.get())
1557       return aFolder;
1558   }
1559   return FolderPtr();
1560 }
1561
1562 static FolderPtr isExtractionCorrect(const FolderPtr& theFirstFeatureFolder,
1563                                      const FolderPtr& theLastFeatureFolder,
1564                                      bool& isExtractBefore)
1565 {
1566   if (theFirstFeatureFolder.get()) {
1567     if (theLastFeatureFolder.get())
1568       return theFirstFeatureFolder == theLastFeatureFolder ? theFirstFeatureFolder : FolderPtr();
1569     else
1570       isExtractBefore = true;
1571     return theFirstFeatureFolder;
1572   } else if (theLastFeatureFolder.get()) {
1573     isExtractBefore = false;
1574     return theLastFeatureFolder;
1575   }
1576   // no folder found
1577   return FolderPtr();
1578 }
1579
1580 bool Model_Objects::removeFromFolder(
1581       const std::list<std::shared_ptr<ModelAPI_Feature> >& theFeatures,
1582       const bool theBefore)
1583 {
1584   if (theFeatures.empty())
1585     return false;
1586
1587   FolderPtr aFirstFeatureFolder =
1588       inFolder(theFeatures.front(), ModelAPI_Folder::FIRST_FEATURE_ID());
1589   FolderPtr aLastFeatureFolder =
1590       inFolder(theFeatures.back(),  ModelAPI_Folder::LAST_FEATURE_ID());
1591
1592   bool isExtractBeforeFolder = theBefore;
1593   FolderPtr aFoundFolder =
1594       isExtractionCorrect(aFirstFeatureFolder, aLastFeatureFolder, isExtractBeforeFolder);
1595   if (!aFoundFolder)
1596     return false; // list of features cannot be extracted
1597
1598   // references of the current folder
1599   ObjectPtr aFolderStartFeature;
1600   ObjectPtr aFolderEndFeature;
1601   if (aFirstFeatureFolder != aLastFeatureFolder) {
1602     aFolderStartFeature = aFoundFolder->reference(ModelAPI_Folder::FIRST_FEATURE_ID())->value();
1603     aFolderEndFeature   = aFoundFolder->reference(ModelAPI_Folder::LAST_FEATURE_ID())->value();
1604   }
1605
1606   FeaturePtr aFeatureToFind = isExtractBeforeFolder ? theFeatures.back() : theFeatures.front();
1607   std::shared_ptr<Model_Data> aData =
1608       std::static_pointer_cast<Model_Data>(aFeatureToFind->data());
1609   if (!aData || !aData->isValid())
1610     return false;
1611   TDF_Label aLabelToFind = aData->label().Father();
1612
1613   // search the label in the list of references
1614   TDF_Label aFeaturesLab = featuresLabel();
1615   Handle(TDataStd_ReferenceArray) aRefs;
1616   if (!aFeaturesLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs))
1617     return false; // no reference array (something is wrong)
1618   int aRefIndex = aRefs->Lower();
1619   for (; aRefIndex <= aRefs->Upper(); ++aRefIndex)
1620     if (aRefs->Value(aRefIndex) == aLabelToFind)
1621       break;
1622
1623   // update folder position
1624   if (isExtractBeforeFolder) {
1625     aData = std::dynamic_pointer_cast<Model_Data>(aFoundFolder->data());
1626     TDF_Label aFolderLabel = aData->label().Father();
1627     TDF_Label aPrevFeatureLabel = aRefs->Value(aRefIndex);
1628     // update start reference of the folder
1629     if (aFolderStartFeature.get()) {
1630       FeaturePtr aNewStartFeature;
1631       do { // skip all features placed in the composite features
1632         aPrevFeatureLabel = aRefs->Value(aRefIndex++);
1633         aNewStartFeature =
1634             aRefIndex <= aRefs->Upper() ? feature(aRefs->Value(aRefIndex)) : FeaturePtr();
1635       } while (aNewStartFeature && isSkippedFeature(aNewStartFeature));
1636       aFolderStartFeature = aNewStartFeature;
1637     }
1638     // move the folder in the list of references after the last feature from the list
1639     RemoveFromRefArray(aFeaturesLab, aFolderLabel);
1640     AddToRefArray(aFeaturesLab, aFolderLabel, aPrevFeatureLabel);
1641   } else {
1642     // update end reference of the folder
1643     if (aFolderEndFeature.get()) {
1644       FeaturePtr aNewEndFeature;
1645       do { // skip all features placed in the composite features
1646         --aRefIndex;
1647         aNewEndFeature =
1648             aRefIndex >= aRefs->Lower() ? feature(aRefs->Value(aRefIndex)) : FeaturePtr();
1649       } while (aNewEndFeature && isSkippedFeature(aNewEndFeature));
1650       aFolderEndFeature = aNewEndFeature;
1651     }
1652   }
1653
1654   // update folder references
1655   aFoundFolder->reference(ModelAPI_Folder::FIRST_FEATURE_ID())->setValue(aFolderStartFeature);
1656   aFoundFolder->reference(ModelAPI_Folder::LAST_FEATURE_ID())->setValue(aFolderEndFeature);
1657
1658   updateHistory(ModelAPI_Feature::group());
1659   return true;
1660 }
1661
1662 FolderPtr Model_Objects::findContainingFolder(const FeaturePtr& theFeature, int& theIndexInFolder)
1663 {
1664   // search the label in the list of references
1665   TDF_Label aFeaturesLab = featuresLabel();
1666   Handle(TDataStd_ReferenceArray) aRefs;
1667   if (!aFeaturesLab.FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs))
1668     return FolderPtr(); // no reference array (something is wrong)
1669
1670   std::shared_ptr<Model_Data> aData =
1671       std::static_pointer_cast<Model_Data>(theFeature->data());
1672   if (!aData || !aData->isValid())
1673     return FolderPtr();
1674   TDF_Label aLabelToFind = aData->label().Father();
1675
1676   theIndexInFolder = -1;
1677   FolderPtr aFoundFolder;
1678   TDF_Label aLastFeatureLabel;
1679
1680   for (int aRefIndex = aRefs->Lower(); aRefIndex <= aRefs->Upper(); ++aRefIndex) {
1681     TDF_Label aCurLabel = aRefs->Value(aRefIndex);
1682     if (isSkippedFeature(feature(aCurLabel)))
1683       continue;
1684
1685     if (aFoundFolder)
1686       ++theIndexInFolder;
1687
1688     if (aCurLabel == aLabelToFind) // the feature is reached
1689       return aFoundFolder;
1690
1691     if (!aFoundFolder) {
1692       // if the current label refers to a folder, feel all necessary data
1693       aFoundFolder = std::dynamic_pointer_cast<ModelAPI_Folder>(folder(aCurLabel));
1694       if (aFoundFolder) {
1695         theIndexInFolder = -1;
1696
1697         AttributeReferencePtr aLastRef =
1698             aFoundFolder->reference(ModelAPI_Folder::LAST_FEATURE_ID());
1699         if (aLastRef->value()) {
1700           aData = std::static_pointer_cast<Model_Data>(aLastRef->value()->data());
1701           if (aData && aData->isValid())
1702             aLastFeatureLabel = aData->label().Father();
1703         } else // folder is empty
1704           aFoundFolder = FolderPtr();
1705       }
1706     } else if (aLastFeatureLabel == aCurLabel) {
1707       // folder is finished, clear all stored data
1708       theIndexInFolder = -1;
1709       aFoundFolder = FolderPtr();
1710     }
1711   }
1712
1713   // folder is not found
1714   theIndexInFolder = -1;
1715   return FolderPtr();
1716 }
1717
1718
1719 std::shared_ptr<ModelAPI_Feature> Model_Objects::feature(
1720     const std::shared_ptr<ModelAPI_Result>& theResult)
1721 {
1722   std::shared_ptr<Model_Data> aData = std::dynamic_pointer_cast<Model_Data>(theResult->data());
1723   if (aData.get()) {
1724     TDF_Label aFeatureLab = aData->label().Father().Father().Father();
1725     FeaturePtr aFeature = feature(aFeatureLab);
1726     if (!aFeature.get() && aFeatureLab.Depth() > 1) { // this may be sub-result of result
1727       aFeatureLab = aFeatureLab.Father().Father();
1728       aFeature = feature(aFeatureLab);
1729     }
1730     return aFeature;
1731   }
1732   return FeaturePtr();
1733 }
1734
1735 std::string Model_Objects::featureResultGroup(FeaturePtr theFeature)
1736 {
1737   if (theFeature->data()->isValid()) {
1738     TDF_ChildIterator aLabIter(resultLabel(theFeature->data(), 0).Father());
1739     if (aLabIter.More()) {
1740       TDF_Label anArgLab = aLabIter.Value();
1741       Handle(TDataStd_Comment) aGroup;
1742       if (aLabIter.Value().FindAttribute(TDataStd_Comment::GetID(), aGroup)) {
1743         return TCollection_AsciiString(aGroup->Get()).ToCString();
1744       }
1745     }
1746   }
1747   static std::string anEmpty;
1748   return anEmpty; // not found
1749 }
1750
1751 void Model_Objects::updateResults(FeaturePtr theFeature, std::set<FeaturePtr>& theProcessed)
1752 {
1753   if (theProcessed.find(theFeature) != theProcessed.end())
1754     return;
1755   theProcessed.insert(theFeature);
1756   // for composites update subs recursively (sketch elements results are needed for the sketch)
1757   CompositeFeaturePtr aComp = std::dynamic_pointer_cast<ModelAPI_CompositeFeature>(theFeature);
1758   if (aComp.get() && aComp->getKind() != "Part") { // don't go inside of parts sub-features
1759     // update subs of composites first
1760     int aSubNum = aComp->numberOfSubs();
1761     for(int a = 0; a < aSubNum; a++) {
1762       FeaturePtr aSub = aComp->subFeature(a);
1763       updateResults(aComp->subFeature(a), theProcessed);
1764     }
1765   }
1766
1767   // for not persistent is will be done by parametric updater automatically
1768   //if (!theFeature->isPersistentResult()) return;
1769   // check the existing results and remove them if there is nothing on the label
1770   std::list<ResultPtr>::const_iterator aResIter = theFeature->results().cbegin();
1771   while(aResIter != theFeature->results().cend()) {
1772     ResultPtr aBody = std::dynamic_pointer_cast<ModelAPI_Result>(*aResIter);
1773     if (aBody.get()) {
1774       std::shared_ptr<Model_Data> aData = std::dynamic_pointer_cast<Model_Data>(aBody->data());
1775       if (!aData.get() || !aData->isValid() || (!aBody->isDisabled() && aData->isDeleted())) {
1776         // found a disappeared result => remove it
1777         theFeature->eraseResultFromList(aBody);
1778         // start iterate from beginning because iterator is corrupted by removing
1779         aResIter = theFeature->results().cbegin();
1780         continue;
1781       }
1782     }
1783     aResIter++;
1784   }
1785   // it may be on undo
1786   if (!theFeature->data() || !theFeature->data()->isValid() || theFeature->isDisabled())
1787     return;
1788   // check that results are presented on all labels
1789   int aResSize = int(theFeature->results().size());
1790   TDF_ChildIterator aLabIter(resultLabel(theFeature->data(), 0).Father());
1791   for(; aLabIter.More(); aLabIter.Next()) {
1792     // here must be GUID of the feature
1793     int aResIndex = aLabIter.Value().Tag() - 1;
1794     ResultPtr aNewBody;
1795     if (aResSize <= aResIndex) {
1796       TDF_Label anArgLab = aLabIter.Value();
1797       Handle(TDataStd_Comment) aGroup;
1798       if (anArgLab.FindAttribute(TDataStd_Comment::GetID(), aGroup)) {
1799         if (aGroup->Get() == ModelAPI_ResultBody::group().c_str() ||
1800             aGroup->Get() == ModelAPI_ResultCompSolid::group().c_str()) {
1801           aNewBody = createBody(theFeature->data(), aResIndex);
1802         } else if (aGroup->Get() == ModelAPI_ResultPart::group().c_str()) {
1803           std::shared_ptr<ModelAPI_ResultPart> aNewP = createPart(theFeature->data(), aResIndex);
1804           theFeature->setResult(aNewP, aResIndex);
1805           if (!aNewP->partDoc().get())
1806             // create the part result: it is better to restore the previous result if it is possible
1807             theFeature->execute();
1808         } else if (aGroup->Get() == ModelAPI_ResultConstruction::group().c_str()) {
1809           theFeature->execute(); // construction shapes are needed for sketch solver
1810         } else if (aGroup->Get() == ModelAPI_ResultGroup::group().c_str()) {
1811           aNewBody = createGroup(theFeature->data(), aResIndex);
1812         } else if (aGroup->Get() == ModelAPI_ResultField::group().c_str()) {
1813           aNewBody = createField(theFeature->data(), aResIndex);
1814         } else if (aGroup->Get() == ModelAPI_ResultParameter::group().c_str()) {
1815           theFeature->attributeChanged("expression"); // just produce a value
1816         } else {
1817           Events_InfoMessage("Model_Objects", "Unknown type of result is found in the document:")
1818             .arg(TCollection_AsciiString(aGroup->Get()).ToCString()).send();
1819         }
1820       }
1821       if (aNewBody && !aNewBody->data()->isDeleted()) {
1822         theFeature->setResult(aNewBody, aResIndex);
1823       }
1824     }
1825   }
1826 }
1827
1828 ResultPtr Model_Objects::findByName(const std::string theName)
1829 {
1830   ResultPtr aResult;
1831   FeaturePtr aResFeature; // keep feature to return the latest one
1832   NCollection_DataMap<TDF_Label, FeaturePtr>::Iterator anObjIter(myFeatures);
1833   for(; anObjIter.More(); anObjIter.Next()) {
1834     FeaturePtr& aFeature = anObjIter.ChangeValue();
1835     if (!aFeature.get() || aFeature->isDisabled()) // may be on close
1836       continue;
1837     std::list<ResultPtr> allResults;
1838     ModelAPI_Tools::allResults(aFeature, allResults);
1839     std::list<ResultPtr>::iterator aRIter = allResults.begin();
1840     for (; aRIter != allResults.cend(); aRIter++) {
1841       ResultPtr aRes = *aRIter;
1842       if (aRes.get() && aRes->data() && aRes->data()->isValid() && !aRes->isDisabled() &&
1843           aRes->data()->name() == theName)
1844       {
1845         if (!aResult.get() || isLater(aFeature, aResFeature)) { // select the latest
1846           aResult = aRes;
1847           aResFeature = aFeature;
1848         }
1849       }
1850     }
1851   }
1852   return aResult;
1853 }
1854
1855 TDF_Label Model_Objects::nextLabel(TDF_Label theCurrent, const bool theReverse)
1856 {
1857   Handle(TDataStd_ReferenceArray) aRefs;
1858   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1859     for(int a = aRefs->Lower(); a <= aRefs->Upper(); a++) { // iterate all existing features
1860       TDF_Label aCurLab = aRefs->Value(a);
1861       if (aCurLab.IsEqual(theCurrent)) {
1862         a += theReverse ? -1 : 1;
1863         if (a >= aRefs->Lower() && a <= aRefs->Upper())
1864           return aRefs->Value(a);
1865         break; // finish iiteration: it's last feature
1866       }
1867     }
1868   }
1869   return TDF_Label();
1870 }
1871
1872 FeaturePtr Model_Objects::nextFeature(FeaturePtr theCurrent, const bool theReverse)
1873 {
1874   std::shared_ptr<Model_Data> aData = std::static_pointer_cast<Model_Data>(theCurrent->data());
1875   if (aData.get() && aData->isValid()) {
1876     TDF_Label aFeatureLabel = aData->label().Father();
1877     TDF_Label aNextLabel = nextLabel(aFeatureLabel, theReverse);
1878     if (!aNextLabel.IsNull())
1879       return feature(aNextLabel);
1880   }
1881   return FeaturePtr(); // not found, last, or something is wrong
1882 }
1883
1884 FeaturePtr Model_Objects::firstFeature()
1885 {
1886   Handle(TDataStd_ReferenceArray) aRefs;
1887   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1888     return feature(aRefs->Value(aRefs->Lower()));
1889   }
1890   return FeaturePtr(); // no features at all
1891 }
1892
1893 FeaturePtr Model_Objects::lastFeature()
1894 {
1895   Handle(TDataStd_ReferenceArray) aRefs;
1896   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1897     return feature(aRefs->Value(aRefs->Upper()));
1898   }
1899   return FeaturePtr(); // no features at all
1900 }
1901
1902 bool Model_Objects::isLater(FeaturePtr theLater, FeaturePtr theCurrent) const
1903 {
1904   std::shared_ptr<Model_Data> aLaterD = std::static_pointer_cast<Model_Data>(theLater->data());
1905   std::shared_ptr<Model_Data> aCurrentD = std::static_pointer_cast<Model_Data>(theCurrent->data());
1906   if (aLaterD.get() && aLaterD->isValid() && aCurrentD.get() && aCurrentD->isValid()) {
1907     TDF_Label aLaterL = aLaterD->label().Father();
1908     TDF_Label aCurrentL = aCurrentD->label().Father();
1909     int aLaterI = -1, aCurentI = -1; // not found yet state
1910     Handle(TDataStd_ReferenceArray) aRefs;
1911     if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1912       for(int a = aRefs->Lower(); a <= aRefs->Upper(); a++) { // iterate all existing features
1913         TDF_Label aCurLab = aRefs->Value(a);
1914         if (aCurLab.IsEqual(aLaterL)) {
1915           aLaterI = a;
1916         } else if (aCurLab.IsEqual(aCurrentL)) {
1917           aCurentI = a;
1918         } else continue;
1919         if (aLaterI != -1 && aCurentI != -1) // both are found
1920           return aLaterI > aCurentI;
1921       }
1922     }
1923   }
1924   return false; // not found, or something is wrong
1925 }
1926
1927 std::list<std::shared_ptr<ModelAPI_Object> > Model_Objects::allObjects()
1928 {
1929   std::list<std::shared_ptr<ModelAPI_Object> > aResult;
1930   Handle(TDataStd_ReferenceArray) aRefs;
1931   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1932     for(int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
1933       ObjectPtr anObject = object(aRefs->Value(a));
1934       if (!anObject.get()) // is it a folder?
1935         anObject = folder(aRefs->Value(a));
1936       if (anObject.get())
1937         aResult.push_back(anObject);
1938     }
1939   }
1940   return aResult;
1941 }
1942
1943 std::list<std::shared_ptr<ModelAPI_Feature> > Model_Objects::allFeatures()
1944 {
1945   std::list<std::shared_ptr<ModelAPI_Feature> > aResult;
1946   Handle(TDataStd_ReferenceArray) aRefs;
1947   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1948     for(int a = aRefs->Lower(); a <= aRefs->Upper(); a++) {
1949       FeaturePtr aFeature = feature(aRefs->Value(a));
1950       if (aFeature.get())
1951         aResult.push_back(aFeature);
1952     }
1953   }
1954   return aResult;
1955 }
1956
1957 int Model_Objects::numInternalFeatures()
1958 {
1959   Handle(TDataStd_ReferenceArray) aRefs;
1960   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1961     return aRefs->Upper() - aRefs->Lower() + 1;
1962   }
1963   return 0; // invalid
1964 }
1965
1966 std::shared_ptr<ModelAPI_Feature> Model_Objects::internalFeature(const int theIndex)
1967 {
1968   Handle(TDataStd_ReferenceArray) aRefs;
1969   if (featuresLabel().FindAttribute(TDataStd_ReferenceArray::GetID(), aRefs)) {
1970     return feature(aRefs->Value(aRefs->Lower() + theIndex));
1971   }
1972   return FeaturePtr(); // invalid
1973 }
1974
1975 Standard_Integer HashCode(const TDF_Label& theLab, const Standard_Integer theUpper)
1976 {
1977   return TDF_LabelMapHasher::HashCode(theLab, theUpper);
1978
1979 }
1980 Standard_Boolean IsEqual(const TDF_Label& theLab1, const TDF_Label& theLab2)
1981 {
1982   return TDF_LabelMapHasher::IsEqual(theLab1, theLab2);
1983 }