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/*=========================================================================
Program: ParaView
Module: vtkXMLCompositeDataReader.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.
=========================================================================*/
/**
* @class vtkXMLCompositeDataReader
* @brief Reader for multi-group datasets
*
* vtkXMLCompositeDataReader reads the VTK XML multi-group data file
* format. XML multi-group 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 group. If the number of sub-blocks is larger than the
* number of processors, each processor will possibly have more than
* 1 sub-block.
*/
#ifndef vtkXMLCompositeDataReader_h
#define vtkXMLCompositeDataReader_h
#include "vtkIOXMLModule.h" // For export macro
#include "vtkXMLReader.h"
class vtkCompositeDataSet;
class vtkInformationIntegerKey;
class vtkInformationIntegerVectorKey;
struct vtkXMLCompositeDataReaderInternals;
class VTKIOXML_EXPORT vtkXMLCompositeDataReader : public vtkXMLReader
{
public:
vtkTypeMacro(vtkXMLCompositeDataReader,vtkXMLReader);
void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
//@{
/**
* Get the output data object for a port on this algorithm.
*/
vtkCompositeDataSet* GetOutput();
vtkCompositeDataSet* GetOutput(int);
//@}
protected:
vtkXMLCompositeDataReader();
~vtkXMLCompositeDataReader() VTK_OVERRIDE;
// Get the name of the data set being read.
const char* GetDataSetName() VTK_OVERRIDE;
// Returns the primary element pass to ReadPrimaryElement().
vtkXMLDataElement* GetPrimaryElement();
void ReadXMLData() VTK_OVERRIDE;
int ReadPrimaryElement(vtkXMLDataElement* ePrimary) VTK_OVERRIDE;
// Setup the output with no data available. Used in error cases.
void SetupEmptyOutput() VTK_OVERRIDE;
int FillOutputPortInformation(int, vtkInformation* info) VTK_OVERRIDE;
// Create a default executive.
vtkExecutive* CreateDefaultExecutive() VTK_OVERRIDE;
vtkXMLReader* GetReaderOfType(const char* type);
int RequestInformation(vtkInformation*,
vtkInformationVector**,
vtkInformationVector*) VTK_OVERRIDE;
// Adds a child data object to the composite parent. childXML is the XML for
// the child data object need to obtain certain meta-data about the child.
void AddChild(vtkCompositeDataSet* parent,
vtkDataObject* child, vtkXMLDataElement* childXML);
// 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)=0;
// Read the vtkDataSet (a leaf) in the composite dataset.
virtual vtkDataSet* ReadDataset(vtkXMLDataElement* xmlElem, const char* filePath);
// Counts "DataSet" elements in the subtree.
unsigned int CountLeaves(vtkXMLDataElement* elem);
/**
* Given the inorder index for a leaf node, this method tells if the current
* process should read the dataset.
*/
int ShouldReadDataSet(unsigned int datasetIndex);
private:
vtkXMLCompositeDataReader(const vtkXMLCompositeDataReader&) VTK_DELETE_FUNCTION;
void operator=(const vtkXMLCompositeDataReader&) VTK_DELETE_FUNCTION;
vtkXMLCompositeDataReaderInternals* Internal;
};
#endif
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