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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkAttributeDataReductionFilter.h,v $

  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 vtkAttributeDataReductionFilter - Reduces cell/point attribute data 
// with different modes to combine cell/point data.
// .SECTION Description
// Filter that takes data with same structure on multiple input connections to
// produce a reduced dataset with cell/point data summed/maxed/minned for 
// all cells/points. Data arrays not available in all inputs
// are discarded. The attribute to reduce can be set to point or cell or field
// or all. Only selected attributes will be reduced according to the 
// type choosen, all other attributes are those at the first input.

#ifndef __vtkAttributeDataReductionFilter_h
#define __vtkAttributeDataReductionFilter_h

#include "vtkDataObjectAlgorithm.h"

class VTK_EXPORT vtkAttributeDataReductionFilter : public vtkDataObjectAlgorithm
{
public:
  static vtkAttributeDataReductionFilter* New();
  vtkTypeRevisionMacro(vtkAttributeDataReductionFilter, vtkDataObjectAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
//BTX
  enum ReductionTypes
    {
    ADD = 1,
    MAX = 2,
    MIN = 3
    };

  enum AttributeTypes // These can be 'or'-ed together.
    {
    POINT_DATA = 0x01,
    CELL_DATA  = 0x02,
    FIELD_DATA = 0x04, // FIXME: Field data not supported yet.
    ROW_DATA = 0x08
    };
//ETX

  // Set the attributes to reduce. Only the choosen type of attributes will be 
  // reduced by this filter. The not-choosen attributes are passed through
  // from the first input unchanged. Default is (POINT_DATA|CELL_DATA) 
  // i.e. point data and cell data will be reduced.
  // FIXME: Field data not supported yet.
  vtkSetMacro(AttributeType, int);
  vtkGetMacro(AttributeType, int);

  // Set the reduction type. Reduction type dictates how overlapping cell/point
  // data is combined. Default is ADD.
  vtkSetMacro(ReductionType, int);
  vtkGetMacro(ReductionType, int);
  const char* GetReductionTypeAsString()
    {
    switch (this->ReductionType)
      {
    case ADD:
      return "ADD";
    case MAX:
      return "MAX";
    case MIN:
      return "MIN";
      }
    return "";
    }
  void SetReductionTypeToAdd() 
    { this->SetReductionType(vtkAttributeDataReductionFilter::ADD); }
  void SetReductionTypeToMax() 
    { this->SetReductionType(vtkAttributeDataReductionFilter::MAX); }
  void SetReductionTypeToMin() 
    { this->SetReductionType(vtkAttributeDataReductionFilter::MIN); }
protected:
  vtkAttributeDataReductionFilter();
  ~vtkAttributeDataReductionFilter();
  
  virtual int RequestData(vtkInformation* request,
                          vtkInformationVector** inputVector,
                          vtkInformationVector* outputVector);

  // Description:
  // This is called by the superclass.
  // This is the method you should override.
  virtual int RequestDataObject(vtkInformation*,
                                vtkInformationVector**,
                                vtkInformationVector*);
  
  virtual int FillInputPortInformation(int port, vtkInformation *info);
  int ReductionType;
  int AttributeType;
private:
  vtkAttributeDataReductionFilter(const vtkAttributeDataReductionFilter&); // Not implemented.
  void operator=(const vtkAttributeDataReductionFilter&); // Not implemented.
};

#endif
