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

  Program:   ParaView
  Module:    vtkXMLMultiBlockDataReader.h

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html 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.

=========================================================================*/
// .NAME vtkXMLMultiBlockDataReader - Reader for multi-block datasets
// .SECTION Description
// vtkXMLMultiBlockDataReader reads the VTK XML multi-block data file
// format. XML multi-block data files are meta-files that point to a list
// of serial VTK XML files. When reading in parallel, it will distribute
// sub-blocks among processor. If the number of sub-blocks is less than
// the number of processors, some processors will not have any sub-blocks
// for that block. If the number of sub-blocks is larger than the
// number of processors, each processor will possibly have more than
// 1 sub-block.

#ifndef __vtkXMLMultiBlockDataReader_h
#define __vtkXMLMultiBlockDataReader_h

#include "vtkXMLCompositeDataReader.h"

class vtkMultiBlockDataSet;

class VTK_IO_EXPORT vtkXMLMultiBlockDataReader : public vtkXMLCompositeDataReader
{
public:
  static vtkXMLMultiBlockDataReader* New();
  vtkTypeMacro(vtkXMLMultiBlockDataReader,vtkXMLCompositeDataReader);
  void PrintSelf(ostream& os, vtkIndent indent);

protected:
  vtkXMLMultiBlockDataReader();
  ~vtkXMLMultiBlockDataReader();  

  // Read the XML element for the subtree of a the composite dataset.
  // dataSetIndex is used to rank the leaf nodes in an inorder traversal.
  virtual void ReadComposite(vtkXMLDataElement* element, 
    vtkCompositeDataSet* composite, const char* filePath, 
    unsigned int &dataSetIndex);

  // Reads file version < 1.0.
  virtual void ReadVersion0(vtkXMLDataElement* element, 
    vtkCompositeDataSet* composite, const char* filePath, 
    unsigned int &dataSetIndex);

  // Get the name of the data set being read.
  virtual const char* GetDataSetName();

  virtual int FillOutputPortInformation(int, vtkInformation* info);

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

  virtual int FillMetaData(vtkCompositeDataSet* metadata,
                           vtkXMLDataElement* element,
                           unsigned int& dataSetIndex);

private:
  vtkXMLMultiBlockDataReader(const vtkXMLMultiBlockDataReader&);  // Not implemented.
  void operator=(const vtkXMLMultiBlockDataReader&);  // Not implemented.
};

#endif
