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

  Program:   Visualization Toolkit
  Module:    vtkBoostSplitTableField.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   vtkBoostSplitTableField
 * @brief   "Splits" one-or-more table fields by duplicating rows containing delimited data.
 *
 *
 * Assume the following table:
 *
 * Author                Year     Title
 * Brian; Jeff; Tim      2007     Foo
 * Tim                   2003     Bar
 *
 * If we produce a graph relating authors to the year in which they publish, the string
 * "Brian; Jeff; Tim" will be treated (incorrectly) as a single author associated with
 * the year 2007.  vtkBoostSplitTableField addresses this by splitting one-or-more fields into
 * "subvalues" using a configurable delimiter and placing each subvalue on its own row
 * (the other fields in the original row are copied).  Using the above example, splitting
 * the "Author" field with a ";" (semicolon) delimiter produces:
 *
 * Author                Year     Title
 * Brian                 2007     Foo
 * Jeff                  2007     Foo
 * Tim                   2007     Foo
 * Tim                   2003     Bar
 *
 * When this table is converted to a graph, each author (correctly) becomes a separate node.
 *
 * Usage:
 *
 * Use AddField() to specify the field(s) to be split.  If no fields have been specified,
 * vtkBoostSplitTableField will act as a passthrough.  By default, no fields are specified.
 *
 * The second argument to AddField() is a string containing zero-to-many single character
 * delimiters (multi-character delimiters are not supported).
 *
 * If the input table is missing a field specified by AddField(), it is an error.
 * If no fields are specified, no splitting is performed.
 * If the delimiter for a field is an empty string, no splitting is performed on that field.
*/

#ifndef vtkBoostSplitTableField_h
#define vtkBoostSplitTableField_h

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

class vtkStringArray;

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

  void ClearFields();
  void AddField(const char* field, const char* delimiters);

protected:
  vtkBoostSplitTableField();
  ~vtkBoostSplitTableField();

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

  vtkStringArray* Fields;
  vtkStringArray* Delimiters;

private:

  class implementation;

  vtkBoostSplitTableField(const vtkBoostSplitTableField&) VTK_DELETE_FUNCTION;
  void operator=(const vtkBoostSplitTableField&) VTK_DELETE_FUNCTION;
};

#endif