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

  Program:   Visualization Toolkit
  Module:    vtkMergeDataObjectFilter.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/
// .NAME vtkMergeDataObjectFilter - merge dataset and data object field to create dataset with attribute data
// .SECTION Description
// vtkMergeDataObjectFilter is a filter that merges the field from a 
// vtkDataObject with a vtkDataSet. The resulting combined dataset can then
// be processed by other filters (e.g., vtkFieldDataToAttributeDataFilter)
// to create attribute data like scalars, vectors, etc.
//
// The filter operates as follows. The field data from the vtkDataObject is
// merged with the input's vtkDataSet and then placed in the output. You can
// choose to place the field data into the cell data field, the point data field,
// or the datasets field (i.e., the one inherited from vtkDataSet's
// superclass vtkDataObject). All this data shuffling occurs via reference
// counting, therefore memory is not copied.
//
// One of the uses of this filter is to allow you to read/generate the
// structure of a dataset independent of the attributes. So, for example, you
// could store the dataset geometry/topology in one file, and field data in
// another. Then use this filter in combination with
// vtkFieldDataToAttributeData to create a dataset ready for processing in
// the visualization pipeline.

#ifndef __vtkMergeDataObjectFilter_h
#define __vtkMergeDataObjectFilter_h

#include "vtkDataSetToDataSetFilter.h"
#include "vtkFieldDataToAttributeDataFilter.h"

class VTK_EXPORT vtkMergeDataObjectFilter : public vtkDataSetToDataSetFilter
{
public:
  static vtkMergeDataObjectFilter *New();
  vtkTypeMacro(vtkMergeDataObjectFilter,vtkDataSetToDataSetFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Specify the data object to merge with the input dataset.
  void SetDataObject(vtkDataObject *object);
  vtkDataObject *GetDataObject();

  // Description:
  // Specify where to place the field data during the merge process.  There
  // are three choices: the field data associated with the vtkDataObject
  // superclass; the point field attribute data; and the cell field attribute
  // data.
  vtkSetMacro(OutputField,int);
  vtkGetMacro(OutputField,int);
  void SetOutputFieldToDataObjectField() 
    {this->SetOutputField(VTK_DATA_OBJECT_FIELD);};
  void SetOutputFieldToPointDataField() 
    {this->SetOutputField(VTK_POINT_DATA_FIELD);};
  void SetOutputFieldToCellDataField() 
    {this->SetOutputField(VTK_CELL_DATA_FIELD);};
  
protected:
  vtkMergeDataObjectFilter();
  ~vtkMergeDataObjectFilter();
  vtkMergeDataObjectFilter(const vtkMergeDataObjectFilter&) {};
  void operator=(const vtkMergeDataObjectFilter&) {};

  // Usual data generation method
  void Execute();

  int OutputField; // which output field

};

#endif


