vtkCollection.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkCollection.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkCollection_h
#define vtkCollection_h

#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObject.h"

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 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();


  void Register(vtkObjectBase* o) override;
  void UnRegister(vtkObjectBase* o) override;

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;
  }
}

#endif