src/STEPControl/STEPControl_Reader.cxx

   1 // Copyright (c) 1999-2014 OPEN CASCADE SAS
   2 //
   3 // This file is part of Open CASCADE Technology software library.
   4 //
   5 // This library is free software; you can redistribute it and/or modify it under
   6 // the terms of the GNU Lesser General Public License version 2.1 as published
   7 // by the Free Software Foundation, with special exception defined in the file
   8 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
   9 // distribution for complete text of the license and disclaimer of any warranty.
  10 //
  11 // Alternatively, this file may be used under the terms of Open CASCADE
  12 // commercial license or contractual agreement.
  13
  14
  15 #include <Interface_EntityIterator.hxx>
  16 #include <Interface_Graph.hxx>
  17 #include <Interface_ShareFlags.hxx>
  18 #include <Interface_Static.hxx>
  19 #include <StepBasic_ApplicationContext.hxx>
  20 #include <StepBasic_ConversionBasedUnit.hxx>
  21 #include <StepBasic_DocumentProductEquivalence.hxx>
  22 #include <StepBasic_HArray1OfNamedUnit.hxx>
  23 #include <StepBasic_LengthMeasureWithUnit.hxx>
  24 #include <StepBasic_MeasureWithUnit.hxx>
  25 #include <StepBasic_NamedUnit.hxx>
  26 #include <StepBasic_PlaneAngleMeasureWithUnit.hxx>
  27 #include <StepBasic_ProductDefinition.hxx>
  28 #include <StepBasic_ProductDefinitionContext.hxx>
  29 #include <StepBasic_ProductDefinitionFormation.hxx>
  30 #include <StepBasic_ProductDefinitionFormationRelationship.hxx>
  31 #include <StepBasic_ProductDefinitionWithAssociatedDocuments.hxx>
  32 #include <StepBasic_SiPrefix.hxx>
  33 #include <StepBasic_SiUnit.hxx>
  34 #include <StepBasic_SiUnitAndLengthUnit.hxx>
  35 #include <StepBasic_SiUnitAndPlaneAngleUnit.hxx>
  36 #include <StepBasic_SiUnitAndSolidAngleUnit.hxx>
  37 #include <StepBasic_SiUnitName.hxx>
  38 #include <StepBasic_SolidAngleMeasureWithUnit.hxx>
  39 #include <StepBasic_SolidAngleUnit.hxx>
  40 #include <STEPConstruct_UnitContext.hxx>
  41 #include <STEPControl_Controller.hxx>
  42 #include <STEPControl_Reader.hxx>
  43 #include <StepData_StepModel.hxx>
  44 #include <StepGeom_GeometricRepresentationContextAndGlobalUnitAssignedContext.hxx>
  45 #include <StepGeom_GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx.hxx>
  46 #include <StepRepr_GlobalUncertaintyAssignedContext.hxx>
  47 #include <StepRepr_GlobalUnitAssignedContext.hxx>
  48 #include <StepRepr_MappedItem.hxx>
  49 #include <StepRepr_NextAssemblyUsageOccurrence.hxx>
  50 #include <StepRepr_ProductDefinitionShape.hxx>
  51 #include <StepRepr_PropertyDefinition.hxx>
  52 #include <StepRepr_RepresentationContext.hxx>
  53 #include <StepRepr_RepresentationMap.hxx>
  54 #include <StepRepr_RepresentationRelationship.hxx>
  55 #include <StepRepr_ShapeAspect.hxx>
  56 #include <StepShape_ManifoldSolidBrep.hxx>
  57 #include <StepShape_ShapeDefinitionRepresentation.hxx>
  58 #include <StepShape_ShapeRepresentation.hxx>
  59 #include <StepShape_ShellBasedSurfaceModel.hxx>
  60 #include <TCollection_AsciiString.hxx>
  61 #include <TColStd_Array1OfAsciiString.hxx>
  62 #include <TColStd_Array1OfReal.hxx>
  63 #include <TColStd_HSequenceOfTransient.hxx>
  64 #include <TColStd_MapOfAsciiString.hxx>
  65 #include <TColStd_SequenceOfAsciiString.hxx>
  66 #include <Transfer_TransientProcess.hxx>
  67 #include <XSControl_Controller.hxx>
  68 #include <XSControl_TransferReader.hxx>
  69 #include <XSControl_WorkSession.hxx>
  70
  71 //=======================================================================
  72 //function : STEPControl_Reader
  73 //purpose  :
  74 //=======================================================================
  75 STEPControl_Reader::STEPControl_Reader ()
  76 {
  77   STEPControl_Controller::Init();
  78   SetNorm ("STEP");
  79 }
  80
  81 //=======================================================================
  82 //function : STEPControl_Reader
  83 //purpose  :
  84 //=======================================================================
  85
  86 STEPControl_Reader::STEPControl_Reader
  87   (const Handle(XSControl_WorkSession)& WS, const Standard_Boolean scratch)
  88 {
  89   STEPControl_Controller::Init();
  90   SetWS (WS,scratch);
  91   SetNorm ("STEP");
  92 }
  93
  94 //=======================================================================
  95 //function : StepModel
  96 //purpose  :
  97 //=======================================================================
  98
  99 Handle(StepData_StepModel) STEPControl_Reader::StepModel () const
 100 {
 101   return Handle(StepData_StepModel)::DownCast(Model());
 102 }
 103
 104 //=======================================================================
 105 //function : TransferRoot
 106 //purpose  :
 107 //=======================================================================
 108
 109 Standard_Boolean STEPControl_Reader::TransferRoot (const Standard_Integer num)
 110 {
 111   return TransferOneRoot (num);
 112 }
 113
 114 //=======================================================================
 115 //function : NbRootsForTransfer
 116 //purpose  :
 117 //=======================================================================
 118
 119 Standard_Integer STEPControl_Reader::NbRootsForTransfer()
 120 {
 121   if (therootsta) return theroots.Length();
 122   therootsta = Standard_True;
 123
 124   //theroots.Clear();
 125   Standard_Integer nb = Model()->NbEntities();
 126   for (Standard_Integer i = 1; i <= nb; i ++) {
 127     Handle(Standard_Transient) ent = Model()->Value(i);
 128     if (Interface_Static::IVal("read.step.all.shapes") == 1) {
 129       // Special case to read invalid shape_representation without links to shapes.
 130       if (ent->IsKind(STANDARD_TYPE(StepShape_ManifoldSolidBrep))) {
 131         Interface_EntityIterator aShareds = WS()->Graph().Sharings(ent);
 132         if (!aShareds.More()) {
 133           theroots.Append(ent);
 134           WS()->TransferReader()->TransientProcess()->RootsForTransfer()->Append(ent);
 135         }
 136       }
 137       if (ent->IsKind(STANDARD_TYPE(StepShape_ShellBasedSurfaceModel))) {
 138         Interface_EntityIterator aShareds = WS()->Graph().Sharings(ent);
 139         if (!aShareds.More()) {
 140           theroots.Append(ent);
 141           WS()->TransferReader()->TransientProcess()->RootsForTransfer()->Append(ent);
 142         }
 143       }
 144     }
 145     if(ent->IsKind(STANDARD_TYPE(StepBasic_ProductDefinition))) {
 146       // PTV 31.01.2003 TRJ11 exclude Product Definition With Associated Document from roots
 147       if (ent->IsKind(STANDARD_TYPE(StepBasic_ProductDefinitionWithAssociatedDocuments))) {
 148         // check if PDWAD-> PDF <-Document_Product_Equivalence.
 149         Standard_Boolean iSexclude = Standard_False;
 150         Handle(StepBasic_ProductDefinitionWithAssociatedDocuments) PDWAD =
 151           Handle(StepBasic_ProductDefinitionWithAssociatedDocuments)::DownCast(ent);
 152         Interface_EntityIterator PDWADsubs = WS()->Graph().Shareds(PDWAD);
 153         for (PDWADsubs.Start(); PDWADsubs.More(); PDWADsubs.Next()) {
 154           if ( !PDWADsubs.Value()->IsKind(STANDARD_TYPE(StepBasic_ProductDefinitionFormation)))
 155             continue;
 156           Handle(StepBasic_ProductDefinitionFormation) localPDF =
 157             Handle(StepBasic_ProductDefinitionFormation)::DownCast(PDWADsubs.Value());
 158           Interface_EntityIterator PDFsubs = WS()->Graph().Sharings(localPDF);
 159           for( PDFsubs.Start(); PDFsubs.More(); PDFsubs.Next() )
 160             if (PDFsubs.Value()->IsKind(STANDARD_TYPE(StepBasic_DocumentProductEquivalence))) {
 161               iSexclude = Standard_True;
 162               break;
 163             }
 164           if (iSexclude)
 165             break;
 166         }
 167         if (iSexclude) {
 168 #ifdef OCCT_DEBUG
 169           cout << "Warning: STEPControl_Reader::NbRootsForTransfer exclude PDWAD from roots" << endl;
 170 #endif
 171           continue;
 172         }
 173       }
 174       Handle(StepBasic_ProductDefinition) PD =
 175         Handle(StepBasic_ProductDefinition)::DownCast(ent);
 176       Standard_Boolean IsRoot = Standard_True;
 177       const Interface_Graph& graph = WS()->Graph();
 178       // determinate roots used NextAssemblyUsageOccurrence
 179       Interface_EntityIterator subs = graph.Sharings(PD);
 180       for(subs.Start(); subs.More(); subs.Next()) {
 181         Handle(StepRepr_NextAssemblyUsageOccurrence) NAUO =
 182           Handle(StepRepr_NextAssemblyUsageOccurrence)::DownCast(subs.Value());
 183         if (NAUO.IsNull()) continue;
 184         if (PD==NAUO->RelatedProductDefinition()) IsRoot=Standard_False;
 185       }
 186       // determinate roots used ProductDefinitionContext
 187       if(IsRoot) {
 188         const char *str1 = Interface_Static::CVal("read.step.product.context");
 189         Standard_Integer ICS = Interface_Static::IVal("read.step.product.context");
 190         if(ICS>1) {
 191           subs = graph.Shareds(PD);
 192           for(subs.Start(); subs.More(); subs.Next()) {
 193             Handle(StepBasic_ProductDefinitionContext) PDC =
 194               Handle(StepBasic_ProductDefinitionContext)::DownCast(subs.Value());
 195             if (PDC.IsNull()) continue;
 196             const char *str2 = PDC->LifeCycleStage()->String().ToCString();
 197             const char *str3 = PDC->Name()->String().ToCString();
 198             if( !( strcasecmp(str1,str2)==0 || strcasecmp(str1,str3)==0 ) )
 199               IsRoot=Standard_False;
 200           }
 201         }
 202       }
 203       // determinate roots used ProductDefinitionFormationRelationship
 204       //subs = graph.Shareds(PD);
 205       //for(subs.Start(); subs.More(); subs.Next()) {
 206       //  Handle(StepBasic_ProductDefinitionFormation) PDF =
 207       //    Handle(StepBasic_ProductDefinitionFormation)::DownCast(subs.Value());
 208       //  if (PDF.IsNull()) continue;
 209       //  Interface_EntityIterator subs1 = graph.Sharings(PDF);
 210       //  for(subs1.Start(); subs1.More(); subs1.Next()) {
 211       //    Handle(StepBasic_ProductDefinitionFormationRelationship) PDFR =
 212       //      Handle(StepBasic_ProductDefinitionFormationRelationship)::DownCast(subs1.Value());
 213       //    if (PDFR.IsNull()) continue;
 214       //    if (PDF==PDFR->RelatedProductDefinition()) IsRoot=Standard_False;
 215       //  }
 216       //}
 217       if (IsRoot) {
 218         theroots.Append(ent);
 219         WS()->TransferReader()->TransientProcess()->RootsForTransfer()->Append(ent);
 220       }
 221     }
 222     TCollection_AsciiString aProdMode = Interface_Static::CVal("read.step.product.mode");
 223     if(!aProdMode.IsEqual("ON")) {
 224       if(ent->IsKind(STANDARD_TYPE(StepShape_ShapeDefinitionRepresentation))) {
 225         Standard_Boolean IsRoot = Standard_True;
 226         Handle(StepShape_ShapeDefinitionRepresentation) SDR =
 227           Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(ent);
 228         Handle(StepRepr_PropertyDefinition) PropDef = SDR->Definition().PropertyDefinition();
 229         if(!PropDef.IsNull()) {
 230           Handle(StepBasic_ProductDefinition) PD = PropDef->Definition().ProductDefinition();
 231           if(!PD.IsNull()) IsRoot = Standard_False;
 232           if(IsRoot) {
 233             Handle(StepRepr_ShapeAspect) SA = PropDef->Definition().ShapeAspect();
 234             if(!SA.IsNull()) {
 235               Handle(StepRepr_ProductDefinitionShape) PDS = SA->OfShape();
 236               PD = PDS->Definition().ProductDefinition();
 237               if(!PD.IsNull()) IsRoot = Standard_False;
 238             }
 239           }
 240           if(IsRoot) {
 241             Handle(StepRepr_NextAssemblyUsageOccurrence) NAUO =
 242               Handle(StepRepr_NextAssemblyUsageOccurrence)::DownCast(PropDef->Definition().ProductDefinitionRelationship());
 243             if(!NAUO.IsNull()) IsRoot = Standard_False;
 244           }
 245           if(IsRoot) {
 246             Handle(StepShape_ShapeRepresentation) SR =
 247               Handle(StepShape_ShapeRepresentation)::DownCast(SDR->UsedRepresentation());
 248             if(SR.IsNull()) IsRoot = Standard_False;
 249           }
 250         }
 251         if(IsRoot) {
 252           theroots.Append(ent);
 253           WS()->TransferReader()->TransientProcess()->RootsForTransfer()->Append(ent);
 254         }
 255       }
 256       if(ent->IsKind(STANDARD_TYPE(StepShape_ShapeRepresentation))) {
 257         Standard_Boolean IsRoot = Standard_True;
 258         Handle(StepShape_ShapeRepresentation) SR =
 259           Handle(StepShape_ShapeRepresentation)::DownCast(ent);
 260         const Interface_Graph& graph = WS()->Graph();
 261         Interface_EntityIterator subs = graph.Sharings(SR);
 262         for(subs.Start(); subs.More() && IsRoot; subs.Next()) {
 263           Handle(StepShape_ShapeDefinitionRepresentation) SDR =
 264             Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs.Value());
 265           if(!SDR.IsNull()) IsRoot = Standard_False;
 266           if(IsRoot) {
 267             Handle(StepRepr_RepresentationRelationship) RR =
 268               Handle(StepRepr_RepresentationRelationship)::DownCast(subs.Value());
 269             if(!RR.IsNull()) {
 270               Handle(StepShape_ShapeRepresentation) SR2 =
 271                 Handle(StepShape_ShapeRepresentation)::DownCast(RR->Rep1());
 272               if(SR==SR2)
 273                 SR2 = Handle(StepShape_ShapeRepresentation)::DownCast(RR->Rep2());
 274               Interface_EntityIterator subs2 = graph.Sharings(SR2);
 275               for(subs2.Start(); subs2.More(); subs2.Next()) {
 276                 Handle(StepShape_ShapeDefinitionRepresentation) SDR2 =
 277                   Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs2.Value());
 278                 if(!SDR2.IsNull()) IsRoot = Standard_False;
 279                 //else {
 280                 //  if(SR==SRR->Rep2()) IsRoot = Standard_False;
 281                 //}
 282               }
 283             }
 284           }
 285           if(IsRoot) {
 286             Handle(StepRepr_RepresentationMap) RM =
 287               Handle(StepRepr_RepresentationMap)::DownCast(subs.Value());
 288             if(!RM.IsNull()) {
 289               Interface_EntityIterator subs2 = graph.Sharings(RM);
 290               for(subs2.Start(); subs2.More(); subs2.Next()) {
 291                 Handle(StepRepr_MappedItem) MI = Handle(StepRepr_MappedItem)::DownCast(subs2.Value());
 292                 if(!MI.IsNull()) {
 293                   Interface_EntityIterator subs3 = graph.Sharings(MI);
 294                   for(subs3.Start(); subs3.More(); subs3.Next()) {
 295                     Handle(StepShape_ShapeRepresentation) SR2 =
 296                       Handle(StepShape_ShapeRepresentation)::DownCast(subs3.Value());
 297                     if(!SR2.IsNull()) IsRoot = Standard_False;
 298                   }
 299                 }
 300               }
 301             }
 302           }
 303         }
 304         if(IsRoot) {
 305           theroots.Append(ent);
 306           WS()->TransferReader()->TransientProcess()->RootsForTransfer()->Append(ent);
 307         }
 308       }
 309     }
 310
 311   }
 312
 313
 314   return theroots.Length();
 315 }
 316
 317 //=======================================================================
 318 //function : FileUnits
 319 //purpose  :
 320 //=======================================================================
 321
 322 void STEPControl_Reader::FileUnits( TColStd_SequenceOfAsciiString& theUnitLengthNames,
 323                                    TColStd_SequenceOfAsciiString& theUnitAngleNames,
 324                                    TColStd_SequenceOfAsciiString& theUnitSolidAngleNames)
 325 {
 326   Standard_Integer nbroots = NbRootsForTransfer();
 327   if(!nbroots)
 328     return;
 329   enum
 330   {
 331     LENGTH = 0,
 332     ANLGE =  1,
 333     SOLID_ANGLE = 2
 334   };
 335   const Interface_Graph& graph = WS()->Graph();
 336   TColStd_MapOfAsciiString aMapUnits[3];
 337
 338   for(Standard_Integer i = 1; i <= nbroots; i++)
 339   {
 340     Handle(Standard_Transient) anEnt = theroots(i);
 341     Standard_Integer num   = graph.EntityNumber(anEnt);
 342     if(!num )
 343       continue;
 344     Handle(StepBasic_ProductDefinition) aProdDef =
 345       Handle(StepBasic_ProductDefinition)::DownCast(anEnt);
 346     Handle(StepShape_ShapeDefinitionRepresentation) aShapeDefRepr;
 347     if(!aProdDef.IsNull())
 348     {
 349       Interface_EntityIterator subsPD = graph.Sharings(aProdDef);
 350       for(subsPD.Start(); subsPD.More() && aShapeDefRepr.IsNull(); subsPD.Next())
 351       {
 352         Handle(StepRepr_ProductDefinitionShape) aProdDefShape =
 353           Handle(StepRepr_ProductDefinitionShape)::DownCast(subsPD.Value());
 354         if(aProdDefShape.IsNull())
 355           continue;
 356         Interface_EntityIterator subsSR = graph.Sharings(aProdDefShape);
 357         Handle(StepShape_ShapeRepresentation) SR;
 358         for(subsSR.Start(); subsSR.More() && aShapeDefRepr.IsNull(); subsSR.Next())
 359         {
 360           Handle(StepShape_ShapeDefinitionRepresentation) aCurShapeDefRepr =
 361             Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subsSR.Value());
 362           if(aCurShapeDefRepr.IsNull())
 363             continue;
 364           Handle(StepRepr_Representation) aUseRepr = aCurShapeDefRepr->UsedRepresentation();
 365           if(aUseRepr.IsNull())
 366             continue;
 367           Handle(StepShape_ShapeRepresentation) aShapeRepr =
 368             Handle(StepShape_ShapeRepresentation)::DownCast(aUseRepr);
 369           if(aShapeRepr.IsNull())
 370             continue;
 371           aShapeDefRepr = aCurShapeDefRepr;
 372
 373         }
 374
 375
 376       }
 377
 378     }
 379     else
 380       aShapeDefRepr = Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(anEnt);
 381     if(!aShapeDefRepr.IsNull())
 382     {
 383       Handle(StepShape_ShapeRepresentation) aShapeRepr =
 384         Handle(StepShape_ShapeRepresentation)::DownCast(aShapeDefRepr->UsedRepresentation());
 385       Handle(StepRepr_RepresentationContext) aRepCont = aShapeRepr->ContextOfItems();
 386       if (aRepCont.IsNull())
 387         continue;
 388       TColStd_Array1OfAsciiString aNameUnits(1,3);
 389       TColStd_Array1OfReal aFactorUnits(1,3);
 390       if(findUnits(aRepCont,aNameUnits,aFactorUnits))
 391       {
 392         Standard_Integer k = LENGTH;
 393         for ( ; k <= SOLID_ANGLE ; k++)
 394         {
 395           if(!aMapUnits[k].Contains(aNameUnits(k+1)))
 396           {
 397             aMapUnits[k].Add(aNameUnits(k+1));
 398             TColStd_SequenceOfAsciiString& anUnitSeq = (k == LENGTH ?
 399                 theUnitLengthNames : ( k == ANLGE ? theUnitAngleNames : theUnitSolidAngleNames ));
 400             anUnitSeq.Append(aNameUnits(k+1));
 401           }
 402         }
 403       }
 404
 405     }
 406
 407   }
 408   //for case when units was not found through PDF or SDR
 409   if(theUnitLengthNames.IsEmpty())
 410   {
 411     const Handle(Interface_InterfaceModel) &aModel = WS()->Model();
 412     if(aModel.IsNull())
 413       return;
 414     Standard_Integer nb = aModel->NbEntities();
 415     for(Standard_Integer i = 1; i <= nb; i++)
 416     {
 417       Handle(Standard_Transient) anEnt = aModel->Value(i);
 418       Handle(StepRepr_RepresentationContext) aRepCont = Handle(StepRepr_RepresentationContext)::DownCast(anEnt);
 419       if (aRepCont.IsNull())
 420         continue;
 421       TColStd_Array1OfAsciiString aNameUnits(1,3);
 422       TColStd_Array1OfReal aFactorUnits(1,3);
 423       if(findUnits(aRepCont,aNameUnits,aFactorUnits))
 424       {
 425         Standard_Integer k = LENGTH;
 426         for ( ; k <= SOLID_ANGLE ; k++)
 427         {
 428           if(!aMapUnits[k].Contains(aNameUnits(k+1)))
 429           {
 430             aMapUnits[k].Add(aNameUnits(k+1));
 431             TColStd_SequenceOfAsciiString& anUnitSeq = (k == LENGTH ?
 432                theUnitLengthNames : ( k == ANLGE ? theUnitAngleNames : theUnitSolidAngleNames ));
 433             anUnitSeq.Append(aNameUnits(k+1));
 434           }
 435         }
 436       }
 437     }
 438   }
 439 }
 440
 441 //=======================================================================
 442 //function : getSiName
 443 //purpose  :
 444 //=======================================================================
 445
 446 inline static TCollection_AsciiString getSiName(const Handle(StepBasic_SiUnit)& theUnit)
 447 {
 448
 449   TCollection_AsciiString aName;
 450   if (theUnit->HasPrefix()) {
 451     switch (theUnit->Prefix()) {
 452       case StepBasic_spExa:   aName += "exa"; break;
 453       case StepBasic_spPeta: aName += "peta"; break;
 454       case StepBasic_spTera: aName += "tera"; break;
 455       case StepBasic_spGiga: aName += "giga"; break;
 456       case StepBasic_spMega:  aName += "mega"; break;
 457       case StepBasic_spHecto: aName += "hecto"; break;
 458       case StepBasic_spDeca:  aName += "deca"; break;
 459       case StepBasic_spDeci:  aName += "deci"; break;
 460
 461       case StepBasic_spPico:  aName += "pico"; break;
 462       case StepBasic_spFemto: aName += "femto"; break;
 463       case StepBasic_spAtto:  aName += "atto"; break;
 464
 465       case StepBasic_spKilo : aName += "kilo"; break;
 466       case StepBasic_spCenti :aName += "centi"; break;
 467       case StepBasic_spMilli :aName += "milli"; break;
 468       case StepBasic_spMicro :aName += "micro"; break;
 469       case StepBasic_spNano :aName += "nano"; break;
 470       default: break;
 471     };
 472   }
 473
 474   switch(theUnit->Name()) {
 475     case StepBasic_sunMetre : aName += "metre"; break;
 476     case StepBasic_sunRadian : aName += "radian"; break;
 477     case StepBasic_sunSteradian : aName += "steradian"; break;
 478     default: break;
 479   };
 480   return aName;
 481 }
 482
 483 //=======================================================================
 484 //function : findUnits
 485 //purpose  :
 486 //=======================================================================
 487
 488 Standard_Boolean STEPControl_Reader::findUnits(
 489        const Handle(StepRepr_RepresentationContext)& theRepCont,
 490        TColStd_Array1OfAsciiString& theNameUnits,
 491        TColStd_Array1OfReal& theFactorUnits)
 492 {
 493    Handle(StepRepr_GlobalUnitAssignedContext) aContext;
 494   Handle(StepRepr_GlobalUncertaintyAssignedContext) aTol;
 495
 496   if (theRepCont->IsKind(STANDARD_TYPE(StepGeom_GeometricRepresentationContextAndGlobalUnitAssignedContext))) {
 497     aContext = Handle(StepGeom_GeometricRepresentationContextAndGlobalUnitAssignedContext)::
 498       DownCast(theRepCont)->GlobalUnitAssignedContext();
 499   }
 500
 501
 502   if (theRepCont->IsKind(STANDARD_TYPE(StepGeom_GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx))) {
 503     aContext = Handle(StepGeom_GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx)::
 504       DownCast(theRepCont)->GlobalUnitAssignedContext();
 505
 506   }
 507   if(aContext.IsNull())
 508     return Standard_False;
 509   // Start Computation
 510   Handle(StepBasic_HArray1OfNamedUnit) anUnits = aContext->Units();
 511   Standard_Integer nbU = aContext->NbUnits();
 512   Standard_Integer nbFind = 0;
 513   for (Standard_Integer i = 1; i <= nbU; i++) {
 514     Handle(StepBasic_NamedUnit) aNamedUnit = aContext->UnitsValue(i);
 515     Handle(StepBasic_ConversionBasedUnit) aConvUnit =
 516       Handle(StepBasic_ConversionBasedUnit)::DownCast(aNamedUnit);
 517     Standard_Integer anInd = 0;
 518     TCollection_AsciiString aName;
 519     Standard_Real anUnitFact = 0;
 520     if( !aConvUnit.IsNull() )
 521     {
 522       Handle(StepBasic_MeasureWithUnit) aMeasWithUnit =
 523         aConvUnit->ConversionFactor();
 524
 525        if(aMeasWithUnit.IsNull())
 526          continue;
 527
 528        if( aMeasWithUnit->IsKind(STANDARD_TYPE(StepBasic_LengthMeasureWithUnit)) )
 529          anInd = 1;
 530        else if( aMeasWithUnit->IsKind(STANDARD_TYPE(StepBasic_PlaneAngleMeasureWithUnit)) )
 531          anInd = 2;
 532        else if( aMeasWithUnit->IsKind(STANDARD_TYPE(StepBasic_SolidAngleMeasureWithUnit)) )
 533          anInd = 3;
 534       if(!anInd)
 535         continue;
 536       aName = aConvUnit->Name()->String();
 537       anUnitFact = aMeasWithUnit->ValueComponent();
 538     }
 539     else
 540     {
 541       Handle(StepBasic_SiUnit) aSiUnit = Handle(StepBasic_SiUnit)::DownCast(aNamedUnit);
 542       if( aSiUnit.IsNull())
 543         continue;
 544       if(aSiUnit->IsKind(STANDARD_TYPE(StepBasic_SiUnitAndLengthUnit)))
 545         anInd =1;
 546       else if(aSiUnit->IsKind(STANDARD_TYPE(StepBasic_SiUnitAndPlaneAngleUnit)))
 547         anInd = 2;
 548       else if(aSiUnit->IsKind(STANDARD_TYPE(StepBasic_SiUnitAndSolidAngleUnit)))
 549         anInd = 3;
 550       if( !anInd )
 551          continue;
 552       anUnitFact = (!aSiUnit->HasPrefix()  ?
 553                     1. : STEPConstruct_UnitContext::ConvertSiPrefix(aSiUnit->Prefix()));
 554       aName = getSiName(aSiUnit);
 555
 556
 557     }
 558     if( !anInd )
 559       continue;
 560
 561    theNameUnits.SetValue(anInd, aName);
 562    theFactorUnits.SetValue(anInd, anUnitFact);
 563     nbFind++;
 564
 565    }
 566
 567   return (nbFind);
 568 }
 569