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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkPChacoReader.h,v $

  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.

=========================================================================*/
/*----------------------------------------------------------------------------
 Copyright (c) Sandia Corporation
 See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
----------------------------------------------------------------------------*/

// .NAME vtkPChacoReader - Read Chaco files
// .SECTION Description
// vtkPChacoReader is a unstructured grid source object that reads
// Chaco files.  The file is read by process 0 and converted into
// a vtkUnstructuredGrid.  The vtkDistributedDataFilter is invoked
// to divide the grid among the processes.  

#ifndef __vtkPChacoReader_h
#define __vtkPChacoReader_h

#include "vtkChacoReader.h"

class vtkTimerLog;
class vtkMultiProcessController;

class VTK_PARALLEL_EXPORT vtkPChacoReader : public vtkChacoReader 
{
public:
  static vtkPChacoReader *New();
  vtkTypeRevisionMacro(vtkPChacoReader,vtkChacoReader);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  //   Set/Get the communicator object (we'll use global World controller
  //   if you don't set a different one).

  void SetController(vtkMultiProcessController *c);
  vtkGetObjectMacro(Controller, vtkMultiProcessController);

protected:
  vtkPChacoReader();
  ~vtkPChacoReader();

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

private:
  vtkPChacoReader(const vtkPChacoReader&); // Not implemented
  void operator=(const vtkPChacoReader&); // Not implemented

  void SetUpEmptyGrid(vtkUnstructuredGrid *output);
  int DivideCells(vtkMultiProcessController *contr, vtkUnstructuredGrid *output,
                  int source);
  int SendGrid(vtkMultiProcessController *c, int to, vtkUnstructuredGrid *grid);
  vtkUnstructuredGrid *GetGrid(vtkMultiProcessController *c, int from);
  vtkUnstructuredGrid *SubGrid(vtkUnstructuredGrid *ug, vtkIdType from, vtkIdType to);
  char *MarshallDataSet(vtkUnstructuredGrid *extractedGrid, int &len);
  vtkUnstructuredGrid *UnMarshallDataSet(char *buf, int size);

  int NumProcesses;
  int MyId;

  vtkMultiProcessController *Controller;
};

#endif
