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

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


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

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ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
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=========================================================================*/
// .NAME vtkAppendPolyData - appends one or more polygonal datasets together
// .SECTION Description
// vtkAppendPolyData is a filter that appends one of more polygonal datasets
// into a single polygonal dataset. All geometry is extracted and appended, 
// but point attributes (i.e., scalars, vectors, normals) are extracted 
// and appended only if all datasets have the point attributes available.
// (For example, if one dataset has scalars but another does not, scalars 
// will not be appended.)

// .SECTION See Also
// vtkAppendFilter

#ifndef __vtkAppendPolyData_h
#define __vtkAppendPolyData_h

#include "vtkPolyDataToPolyDataFilter.h"

class VTK_EXPORT vtkAppendPolyData : public vtkPolyDataToPolyDataFilter
{
public:
  static vtkAppendPolyData *New();

  vtkTypeMacro(vtkAppendPolyData,vtkPolyDataToPolyDataFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Add a dataset to the list of data to append.
  void AddInput(vtkPolyData *);

  // Description:
  // Remove a dataset from the list of data to append.
  void RemoveInput(vtkPolyData *);

  // Description:
  // Get any input of this filter.
  vtkPolyData *GetInput(int idx);
  vtkPolyData *GetInput() { return this->GetInput( 0 ); };
  
  // Description:
  // ParallelStreaming is for a particular application.
  // It causes this filter to ask for a different piece
  // from each of its inputs.  If all the inputs are the same,
  // then the output of this append filter is the whole dataset
  // pieced back together.  Duplicate points are create 
  // along the seams.  The purpose of this feature is to get 
  // data parallism at a course scale.  Each of the inputs
  // can be generated in a different process at the same time.
  vtkSetMacro(ParallelStreaming, int); 
  vtkGetMacro(ParallelStreaming, int); 
  vtkBooleanMacro(ParallelStreaming, int); 


protected:
  vtkAppendPolyData();
  ~vtkAppendPolyData();
  vtkAppendPolyData(const vtkAppendPolyData&) {};
  void operator=(const vtkAppendPolyData&) {};

  // Flag for selecting parallel streaming behavior
  int ParallelStreaming;

  // Usual data generation method
  void Execute();

  void ComputeInputUpdateExtents(vtkDataObject *output);

  // An efficient way to append data/cells.
  void AppendData(vtkDataArray *dest, vtkDataArray *src, int offset);
  int *AppendCells(int *pDest, vtkCellArray *src, int offset);

 private:
  // hide the superclass' AddInput() from the user and the compiler
  void AddInput(vtkDataObject *)
    { vtkErrorMacro( << "AddInput() must be called with a vtkPolyData not a vtkDataObject."); };
  void RemoveInput(vtkDataObject *input)
    { this->vtkProcessObject::RemoveInput(input); 
    this->vtkProcessObject::SqueezeInputArray();};
  
  
};

#endif


