vtkCollection.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkCollection_h
#define vtkCollection_h
 
#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObject.h"
 
VTK_ABI_NAMESPACE_BEGIN
class vtkCollectionElement //;prevents pick-up by man page generator
{
public:
  vtkCollectionElement()
    : Item(nullptr)
    , Next(nullptr)
  {
  }
  vtkObject* Item;
  vtkCollectionElement* Next;
};
typedef void* vtkCollectionSimpleIterator;
 
class vtkCollectionIterator;
 
class VTKCOMMONCORE_EXPORT vtkCollection : public vtkObject
{
public:
  vtkTypeMacro(vtkCollection, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  static vtkCollection* New();
 
  void AddItem(vtkObject*);
 
  void InsertItem(int i, vtkObject*);
 
  void ReplaceItem(int i, vtkObject*);
 
  void RemoveItem(int i);
 
  void RemoveItem(vtkObject*);
 
  void RemoveAllItems();
 
  int IsItemPresent(vtkObject* a);
 
  int IndexOfFirstOccurence(vtkObject* a);
 
  int GetNumberOfItems() { return this->NumberOfItems; }
 
  void InitTraversal() { this->Current = this->Top; }
 
  void InitTraversal(vtkCollectionSimpleIterator& cookie)
  {
    cookie = static_cast<vtkCollectionSimpleIterator>(this->Top);
  }
 
  vtkObject* GetNextItemAsObject();
 
  vtkObject* GetItemAsObject(int i);
 
  vtkObject* GetNextItemAsObject(vtkCollectionSimpleIterator& cookie);
 
  VTK_NEWINSTANCE vtkCollectionIterator* NewIterator();
 
 
  bool UsesGarbageCollector() const override { return true; }
 
protected:
  vtkCollection();
  ~vtkCollection() override;
 
  virtual void RemoveElement(vtkCollectionElement* element, vtkCollectionElement* previous);
  virtual void DeleteElement(vtkCollectionElement*);
  int NumberOfItems;
  vtkCollectionElement* Top;
  vtkCollectionElement* Bottom;
  vtkCollectionElement* Current;
 
  friend class vtkCollectionIterator;
 
  // See vtkGarbageCollector.h:
  void ReportReferences(vtkGarbageCollector* collector) override;
 
private:
  vtkCollection(const vtkCollection&) = delete;
  void operator=(const vtkCollection&) = delete;
};
 
inline vtkObject* vtkCollection::GetNextItemAsObject()
{
  vtkCollectionElement* elem = this->Current;
 
  if (elem != nullptr)
  {
    this->Current = elem->Next;
    return elem->Item;
  }
  else
  {
    return nullptr;
  }
}
 
inline vtkObject* vtkCollection::GetNextItemAsObject(void*& cookie)
{
  vtkCollectionElement* elem = static_cast<vtkCollectionElement*>(cookie);
 
  if (elem != nullptr)
  {
    cookie = static_cast<void*>(elem->Next);
    return elem->Item;
  }
  else
  {
    return nullptr;
  }
}
 
VTK_ABI_NAMESPACE_END
#endif