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

  Program:   Visualization Toolkit
  Module:    vtkGenerateIndexArray.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.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
// .NAME vtkGenerateIndexArray
//
// .SECTION Description
// Generates a new vtkIdTypeArray containing zero-base indices.
//
// vtkGenerateIndexArray operates in one of two distinct "modes".
// By default, it simply generates an index array containing
// monotonically-increasing integers in the range [0, N), where N
// is appropriately sized for the field type that will store the
// results.  This mode is useful for generating a unique ID field
// for datasets that have none.
//
// The second "mode" uses an existing array from the input data
// object as a "reference".  Distinct values from the reference
// array are sorted in ascending order, and an integer index in
// the range [0, N) is assigned to each.  The resulting map is
// used to populate the output index array, mapping each value
// in the reference array to its corresponding index and storing
// the result in the output array.  This mode is especially
// useful when generating tensors, since it allows us to "map"
// from an array with arbitrary contents to an index that can
// be used as tensor coordinates.

#ifndef __vtkGenerateIndexArray_h
#define __vtkGenerateIndexArray_h

#include "vtkDataObjectAlgorithm.h"

class VTK_INFOVIS_EXPORT vtkGenerateIndexArray : public vtkDataObjectAlgorithm 
{
public:
  static vtkGenerateIndexArray *New();

  vtkTypeRevisionMacro(vtkGenerateIndexArray, vtkDataObjectAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Control the output index array name (default: "index"). 
  vtkSetStringMacro(ArrayName);
  vtkGetStringMacro(ArrayName);

  // Description:
  // Control the location where the index array will be stored
  vtkSetMacro(FieldType, int);
  vtkGetMacro(FieldType, int);

  // Description:
  // Specifies an optional reference array for index-generation.
  vtkSetStringMacro(ReferenceArrayName);
  vtkGetStringMacro(ReferenceArrayName);

//BTX
  enum
  {
    ROW_DATA = 0,
    POINT_DATA = 1,
    CELL_DATA = 2,
    VERTEX_DATA = 3,
    EDGE_DATA = 4
  };
//ETX

protected:
  vtkGenerateIndexArray();
  ~vtkGenerateIndexArray();
 
  virtual int ProcessRequest(
    vtkInformation* request, 
    vtkInformationVector** inputVector,
    vtkInformationVector* outputVector);

  virtual int RequestDataObject(
    vtkInformation* request,
    vtkInformationVector** inputVector,
    vtkInformationVector* outputVector);
  
  int RequestData(
    vtkInformation*,
    vtkInformationVector**,
    vtkInformationVector*);

  char* ArrayName;
  int FieldType;
  char* ReferenceArrayName;

private:
  vtkGenerateIndexArray(const vtkGenerateIndexArray&);  // Not implemented.
  void operator=(const vtkGenerateIndexArray&);  // Not implemented.
};

#endif

