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

  Program:   Visualization Toolkit
  Module:    vtkBridgeCellIteratorOnDataSet.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.

=========================================================================*/
/**
 * @class   vtkBridgeCellIteratorOnDataSet
 * @brief   Iterate over cells of a dataset.
 * @sa
 * vtkBridgeCellIterator, vtkBridgeDataSet, vtkBridgeCellIteratorStrategy
*/

#ifndef vtkBridgeCellIteratorOnDataSet_h
#define vtkBridgeCellIteratorOnDataSet_h

#include "vtkBridgeCellIteratorStrategy.h"

class vtkBridgeCell;
class vtkBridgeDataSet;
class vtkBridgeCell;
class vtkIdList;

class VTKTESTINGGENERICBRIDGE_EXPORT vtkBridgeCellIteratorOnDataSet : public vtkBridgeCellIteratorStrategy
{
public:
  static vtkBridgeCellIteratorOnDataSet *New();
  vtkTypeMacro(vtkBridgeCellIteratorOnDataSet,
                       vtkBridgeCellIteratorStrategy);
  void PrintSelf(ostream& os, vtkIndent indent);

  /**
   * Move iterator to first position if any (loop initialization).
   */
  void Begin();

  /**
   * Is there no cell at iterator position? (exit condition).
   */
  int IsAtEnd();

  /**
   * Cell at current position
   * \pre not_at_end: !IsAtEnd()
   * \pre c_exists: c!=0
   * THREAD SAFE
   */
  void GetCell(vtkGenericAdaptorCell *c);

  /**
   * Cell at current position.
   * NOT THREAD SAFE
   * \pre not_at_end: !IsAtEnd()
   * \post result_exits: result!=0
   */
  vtkGenericAdaptorCell *GetCell();

  /**
   * Move iterator to next position. (loop progression).
   * \pre not_at_end: !IsAtEnd()
   */
  void Next();

  /**
   * Used internally by vtkBridgeDataSet.
   * Iterate over cells of `ds' of some dimension `dim'.
   * \pre ds_exists: ds!=0
   * \pre valid_dim_range: (dim>=-1) && (dim<=3)
   */
  void InitWithDataSet(vtkBridgeDataSet *ds,
                       int dim);

protected:
  vtkBridgeCellIteratorOnDataSet();
  virtual ~vtkBridgeCellIteratorOnDataSet();

  int Dim; // Dimension of cells over which to iterate (-1 to 3)

  vtkBridgeDataSet *DataSet; // the structure on which the objet iterates.
  vtkIdType Id; // the id at current position.
  vtkIdType Size; // size of the structure.
  vtkBridgeCell *Cell; // cell at current position.

private:
  vtkBridgeCellIteratorOnDataSet(const vtkBridgeCellIteratorOnDataSet&) VTK_DELETE_FUNCTION;
  void operator=(const vtkBridgeCellIteratorOnDataSet&) VTK_DELETE_FUNCTION;
};

#endif