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

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


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * 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.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
// .NAME vtkDataSetReader - class to read any type of vtk dataset
// .SECTION Description
// vtkDataSetReader is a class that provides instance variables and methods
// to read any type of dataset in Visualization Toolkit (vtk) format.  The
// output type of this class will vary depending upon the type of data
// file. Convenience methods are provided to keep the data as a particular
// type. (See text for format description details).
// The superclass of this class, vtkDataReader, provides many methods for
// controlling the reading of the data file, see vtkDataReader for more
// information.
// .SECTION Caveats
// Binary files written on one system may not be readable on other systems.
// .SECTION See Also
// vtkDataReader vtkPolyDataReader vtkRectilinearGridReader 
// vtkStructuredPointsReader vtkStructuredGridReader vtkUnstructuredGridReader

#ifndef __vtkDataSetReader_h
#define __vtkDataSetReader_h

#include "vtkDataReader.h"

class vtkPolyData;
class vtkStructuredPoints;
class vtkStructuredGrid;
class vtkUnstructuredGrid;
class vtkRectilinearGrid;

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

  // Description:
  // Get the output of this source as a general vtkDataSet. Since we need 
  // to know the type of the data, the FileName must be set before GetOutput 
  // is applied.
  vtkDataSet *GetOutput();
  vtkDataSet *GetOutput(int idx)
    {return (vtkDataSet *) this->vtkSource::GetOutput(idx); };

  // Description:
  // Get the output as various concrete types. This method is typically used
  // when you know exactly what type of data is being read.  Otherwise, use
  // the general GetOutput() method. If the wrong type is used NULL is
  // returned.  (You must also set the filename of the object prior to
  // getting the output.)
  vtkPolyData *GetPolyDataOutput();
  vtkStructuredPoints *GetStructuredPointsOutput();
  vtkStructuredGrid *GetStructuredGridOutput();
  vtkUnstructuredGrid *GetUnstructuredGridOutput();
  vtkRectilinearGrid *GetRectilinearGridOutput();

  // Description:
  // If there is no output, execute anyway.  Execute creates an output.
  void Update();
  
protected:
  vtkDataSetReader();
  ~vtkDataSetReader();
  vtkDataSetReader(const vtkDataSetReader&) {};
  void operator=(const vtkDataSetReader&) {};

  void Execute();
  vtkDataReader *Reader;

};

#endif


