vtkEquivalenceSet.h

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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkEquivalenceSet_h
#define vtkEquivalenceSet_h
 
#include "vtkObject.h"
#include "vtkPVVTKExtensionsFiltersGeneralModule.h" //needed for exports
class vtkIntArray;
 
class VTKPVVTKEXTENSIONSFILTERSGENERAL_EXPORT vtkEquivalenceSet : public vtkObject
{
public:
  vtkTypeMacro(vtkEquivalenceSet, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
  static vtkEquivalenceSet* New();
 
  void Initialize();
  void AddEquivalence(int id1, int id2);
 
  // The length of the equivalent array...
  // The Domain of the equivalance map is [0, numberOfMembers).
  int GetNumberOfMembers();
 
  // Valid only after set is resolved.
  // The range of the map is [0 numberOfResolvedSets)
  int GetNumberOfResolvedSets() { return this->NumberOfResolvedSets; }
 
  // Return the id of the equivalent set.
  int GetEquivalentSetId(int memberId);
 
  // Equivalent set ids are reassinged to be sequential.
  // You cannot add anymore equivalences after this is called.
  virtual int ResolveEquivalences();
 
  void DeepCopy(vtkEquivalenceSet* in);
 
  // Needed for sending the set over MPI.
  // Be very careful with the pointer.
  // I guess this means do not write to the memory.
  int* GetPointer();
 
  // Free unused memory
  void Squeeze();
 
  // Report used memory
  vtkIdType Capacity();
 
  // We should fix the pointer API and hide this ivar.
  int Resolved;
 
  int GetReference(int memberId);
 
protected:
  vtkEquivalenceSet();
  ~vtkEquivalenceSet() override;
 
  int NumberOfResolvedSets;
 
  // To merge connected framgments that have different ids because they were
  // traversed by different processes or passes.
  vtkIntArray* EquivalenceArray;
 
  // Return the id of the equivalent set.
  void EquateInternal(int id1, int id2);
 
private:
  vtkEquivalenceSet(const vtkEquivalenceSet&) = delete;
  void operator=(const vtkEquivalenceSet&) = delete;
};
 
#endif