vtkReduceTable.h

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

  Program:   Visualization Toolkit
  Module:    vtkReduceTable.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 vtkReduceTable_h
#define vtkReduceTable_h

#include "vtkInfovisCoreModule.h" // For export macro
#include "vtkTableAlgorithm.h"

#include <map>                   // For ivar
#include <set>                   // For ivar
#include <vector>                // For ivar

class vtkVariant;

class VTKINFOVISCORE_EXPORT vtkReduceTable : public vtkTableAlgorithm
{
public:
  static vtkReduceTable* New();
  vtkTypeMacro(vtkReduceTable,vtkTableAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  vtkGetMacro(IndexColumn, vtkIdType);
  vtkSetMacro(IndexColumn, vtkIdType);


  vtkGetMacro(NumericalReductionMethod, int);
  vtkSetMacro(NumericalReductionMethod, int);


  vtkGetMacro(NonNumericalReductionMethod, int);
  vtkSetMacro(NonNumericalReductionMethod, int);

  int GetReductionMethodForColumn(vtkIdType col);

  void SetReductionMethodForColumn(vtkIdType col, int method);

  enum
  {
    MEAN,
    MEDIAN,
    MODE
  };

protected:
  vtkReduceTable();
  ~vtkReduceTable() override;

  int RequestData(
    vtkInformation*,
    vtkInformationVector**,
    vtkInformationVector*) override;

  void InitializeOutputTable(vtkTable *input, vtkTable *output);

  void AccumulateIndexValues(vtkTable *input);

  void PopulateIndexColumn(vtkTable *output);

  void PopulateDataColumn(vtkTable *input, vtkTable *output, vtkIdType col);

  void ReduceValuesToMean(vtkTable *input, vtkTable *output,
                          vtkIdType row, vtkIdType col,
                          std::vector<vtkIdType> oldRows);

  void ReduceValuesToMedian(vtkTable *input, vtkTable *output,
                            vtkIdType row, vtkIdType col,
                            std::vector<vtkIdType> oldRows);

  void ReduceValuesToMode(vtkTable *input, vtkTable *output,
                          vtkIdType row, vtkIdType col,
                          std::vector<vtkIdType> oldRows);

  vtkIdType IndexColumn;
  std::set<vtkVariant> IndexValues;
  std::map<vtkVariant, std::vector<vtkIdType> > NewRowToOldRowsMap;
  std::map<vtkIdType, int> ColumnReductionMethods;

  int NumericalReductionMethod;
  int NonNumericalReductionMethod;

private:
  vtkReduceTable(const vtkReduceTable&) = delete;
  void operator=(const vtkReduceTable&) = delete;
};

#endif