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

  Program:   Visualization Toolkit
  Module:    vtkBridgeCellIterator.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.

=========================================================================*/
// .NAME vtkBridgeCellIterator - Implementation of vtkGenericCellIterator.
// It is just an example that show how to implement the Generic. It is also
// used for testing and evaluating the Generic.
// .SECTION See Also
// vtkGenericCellIterator, vtkBridgeDataSet

#ifndef __vtkBridgeCellIterator_h
#define __vtkBridgeCellIterator_h

#include "vtkBridgeExport.h"
#include "vtkGenericCellIterator.h"

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

class vtkBridgeCellIteratorStrategy;
class vtkBridgeCellIteratorOnDataSet;
class vtkBridgeCellIteratorOne;
class vtkBridgeCellIteratorOnCellBoundaries;
class vtkBridgeCellIteratorOnCellList;

class VTK_BRIDGE_EXPORT vtkBridgeCellIterator : public vtkGenericCellIterator
{
public:
  static vtkBridgeCellIterator *New();
  vtkTypeRevisionMacro(vtkBridgeCellIterator,vtkGenericCellIterator);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  // Description:
  // Move iterator to first position if any (loop initialization).
  void Begin();

  // Description:
  // Is there no cell at iterator position? (exit condition).
  int IsAtEnd();
  
  // Description:
  // Create an empty cell.
  // \post result_exists: result!=0
  vtkGenericAdaptorCell *NewCell();
  
  // Description:
  // Cell at current position
  // \pre not_at_end: !IsAtEnd()
  // \pre c_exists: c!=0
  // THREAD SAFE
  void GetCell(vtkGenericAdaptorCell *c);
  
  // Description:
  // Cell at current position.
  // NOT THREAD SAFE
  // \pre not_at_end: !IsAtEnd()
  // \post result_exits: result!=0
  vtkGenericAdaptorCell *GetCell();
  
  // Description:
  // Move iterator to next position. (loop progression).
  // \pre not_at_end: !IsAtEnd()
  void Next();
  
  // Description:
  // 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);
  
  // Description:
  // Used internally by vtkBridgeDataSet.
  // Iterate over boundary cells of `ds' of some dimension `dim'.
  // \pre ds_exists: ds!=0
  // \pre valid_dim_range: (dim>=-1) && (dim<=3)
  void InitWithDataSetBoundaries(vtkBridgeDataSet *ds,
                                 int dim,
                                 int exterior_only);
  
  // Description:
  // Used internally by vtkBridgeDataSet.
  // Iterate on one cell `id' of `ds'.
  // \pre ds_exists: ds!=0
  // \pre valid_id: (id>=0)&&(id<=ds->GetNumberOfCells())
  void InitWithOneCell(vtkBridgeDataSet *ds,
                       vtkIdType cellid);
  
  // Description:
  // Used internally by vtkBridgeCell.
  // Iterate on one cell `c'.
  // \pre c_exists: c!=0
  void InitWithOneCell(vtkBridgeCell *c);
  
  // Description:
  // Used internally by vtkBridgeCell.
  // Iterate on boundary cells of a cell.
  // \pre cell_exists: cell!=0
  // \pre valid_dim_range: (dim==-1) || ((dim>=0)&&(dim<cell->GetDimension()))
  void InitWithCellBoundaries(vtkBridgeCell *cell,
                              int dim);

  // Description:
  // Used internally by vtkBridgeCell.
  // Iterate on neighbors defined by `cells' over the dataset `ds'.
  // \pre cells_exist: cells!=0
  // \pre ds_exists: ds!=0
  void InitWithCells(vtkIdList *cells,
                     vtkBridgeDataSet *ds);
  
  // Description:
  // Used internally by vtkBridgeCell.
  // Iterate on a boundary cell (defined by its points `pts' with coordinates
  // `coords', dimension `dim' and unique id `cellid') of a cell.
  // \pre coords_exist: coords!=0
  // \pre pts_exist: pts!=0
  // \pre valid_dim: dim>=0 && dim<=2
  // \pre valid_points: pts->GetNumberOfIds()>dim
  void InitWithPoints(vtkPoints *coords,
                      vtkIdList *pts,
                      int dim,
                      vtkIdType cellid);

protected:
  vtkBridgeCellIterator();
  virtual ~vtkBridgeCellIterator();
  
  vtkBridgeCellIteratorStrategy *CurrentIterator;
  vtkBridgeCellIteratorOnDataSet *IteratorOnDataSet;
  vtkBridgeCellIteratorOne *IteratorOneCell;
  vtkBridgeCellIteratorOnCellBoundaries * IteratorOnCellBoundaries;
  vtkBridgeCellIteratorOnCellList *IteratorOnCellList;
  
  vtkBridgeDataSet *DataSet; // the structure on which the objet iterates.
  vtkIdType Id; // the id at current position.
  int OneCell; // Is in one cell mode?
  vtkIdType Size; // size of the structure.
  vtkBridgeCell *Cell; // cell at current position.
  
private:
  vtkBridgeCellIterator(const vtkBridgeCellIterator&); // Not implemented
  void operator=(const vtkBridgeCellIterator&); // Not implemented
};

#endif
