vtkXMLReader.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkXMLReader.h
 
  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.
 
=========================================================================*/
#ifndef vtkXMLReader_h
#define vtkXMLReader_h
 
#include "vtkAlgorithm.h"
#include "vtkIOXMLModule.h" // For export macro
 
#include <string> // for std::string
 
class vtkAbstractArray;
class vtkCallbackCommand;
class vtkDataArraySelection;
class vtkDataSet;
class vtkDataSetAttributes;
class vtkXMLDataElement;
class vtkXMLDataParser;
class vtkInformationVector;
class vtkInformation;
class vtkCommand;
 
class VTKIOXML_EXPORT vtkXMLReader : public vtkAlgorithm
{
public:
  vtkTypeMacro(vtkXMLReader, vtkAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  enum FieldType
  {
    POINT_DATA,
    CELL_DATA,
    OTHER
  };
 
 
  vtkSetStringMacro(FileName);
  vtkGetStringMacro(FileName);
 
 
  vtkSetMacro(ReadFromInputString, vtkTypeBool);
  vtkGetMacro(ReadFromInputString, vtkTypeBool);
  vtkBooleanMacro(ReadFromInputString, vtkTypeBool);
  void SetInputString(const std::string& s) { this->InputString = s; }
 
  virtual int CanReadFile(const char* name);
 
 
  vtkDataSet* GetOutputAsDataSet();
  vtkDataSet* GetOutputAsDataSet(int index);
 
 
  vtkGetObjectMacro(PointDataArraySelection, vtkDataArraySelection);
  vtkGetObjectMacro(CellDataArraySelection, vtkDataArraySelection);
  vtkGetObjectMacro(ColumnArraySelection, vtkDataArraySelection);
 
 
  int GetNumberOfPointArrays();
  int GetNumberOfCellArrays();
  int GetNumberOfColumnArrays();
 
 
  const char* GetPointArrayName(int index);
  const char* GetCellArrayName(int index);
  const char* GetColumnArrayName(int index);
 
 
  int GetPointArrayStatus(const char* name);
  int GetCellArrayStatus(const char* name);
  void SetPointArrayStatus(const char* name, int status);
  void SetCellArrayStatus(const char* name, int status);
  int GetColumnArrayStatus(const char* name);
  void SetColumnArrayStatus(const char* name, int status);
 
  // For the specified port, copy the information this reader sets up in
  // SetupOutputInformation to outInfo
  virtual void CopyOutputInformation(vtkInformation* vtkNotUsed(outInfo), int vtkNotUsed(port)) {}
 
 
  vtkSetMacro(TimeStep, int);
  vtkGetMacro(TimeStep, int);
 
  vtkGetMacro(NumberOfTimeSteps, int);
 
  vtkGetVector2Macro(TimeStepRange, int);
  vtkSetVector2Macro(TimeStepRange, int);
 
  vtkXMLDataParser* GetXMLParser() { return this->XMLParser; }
 
  vtkTypeBool ProcessRequest(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override;
 
 
  void SetReaderErrorObserver(vtkCommand*);
  vtkGetObjectMacro(ReaderErrorObserver, vtkCommand);
 
 
  void SetParserErrorObserver(vtkCommand*);
  vtkGetObjectMacro(ParserErrorObserver, vtkCommand);
 
protected:
  vtkXMLReader();
  ~vtkXMLReader() override;
 
  // Pipeline execution methods to be defined by subclass.  Called by
  // corresponding RequestData methods after appropriate setup has been
  // done.
  virtual int ReadXMLInformation();
  virtual void ReadXMLData();
 
  // Get the name of the data set being read.
  virtual const char* GetDataSetName() = 0;
 
  // Test if the reader can read a file with the given version number.
  virtual int CanReadFileVersion(int major, int minor);
 
  // Setup the output with no data available.  Used in error cases.
  virtual void SetupEmptyOutput() = 0;
 
  // Setup the output's information.
  virtual void SetupOutputInformation(vtkInformation* vtkNotUsed(outInfo)) {}
 
  // Setup the output's data with allocation.
  virtual void SetupOutputData();
 
  // Read the primary element from the file.  This is the element
  // whose name is the value returned by GetDataSetName().
  virtual int ReadPrimaryElement(vtkXMLDataElement* ePrimary);
 
  // Read the top-level element from the file.  This is always the
  // VTKFile element.
  virtual int ReadVTKFile(vtkXMLDataElement* eVTKFile);
 
  int GetLocalDataType(vtkXMLDataElement* da, int datatype);
 
  // Create a vtkAbstractArray from its cooresponding XML representation.
  // Does not allocate.
  vtkAbstractArray* CreateArray(vtkXMLDataElement* da);
 
  // Create a vtkInformationKey from its corresponding XML representation.
  // Stores it in the instance of vtkInformationProvided. Does not allocate.
  int CreateInformationKey(vtkXMLDataElement* eInfoKey, vtkInformation* info);
 
  // Populates the info object with the InformationKey children in infoRoot.
  // Returns false if errors occur.
  bool ReadInformation(vtkXMLDataElement* infoRoot, vtkInformation* info);
 
  // Internal utility methods.
  virtual int OpenStream();
  virtual void CloseStream();
  virtual int OpenVTKFile();
  virtual void CloseVTKFile();
  virtual int OpenVTKString();
  virtual void CloseVTKString();
  virtual void CreateXMLParser();
  virtual void DestroyXMLParser();
  void SetupCompressor(const char* type);
  int CanReadFileVersionString(const char* version);
 
  virtual int CanReadFileWithDataType(const char* dsname);
 
  // Returns the major version for the file being read. -1 when invalid.
  vtkGetMacro(FileMajorVersion, int);
 
  // Returns the minor version for the file being read. -1 when invalid.
  vtkGetMacro(FileMinorVersion, int);
 
  // Utility methods for subclasses.
  int IntersectExtents(int* extent1, int* extent2, int* result);
  int Min(int a, int b);
  int Max(int a, int b);
  void ComputePointDimensions(int* extent, int* dimensions);
  void ComputePointIncrements(int* extent, vtkIdType* increments);
  void ComputeCellDimensions(int* extent, int* dimensions);
  void ComputeCellIncrements(int* extent, vtkIdType* increments);
  vtkIdType GetStartTuple(int* extent, vtkIdType* increments, int i, int j, int k);
  void ReadAttributeIndices(vtkXMLDataElement* eDSA, vtkDataSetAttributes* dsa);
  char** CreateStringArray(int numStrings);
  void DestroyStringArray(int numStrings, char** strings);
 
  // Read an Array values starting at the given index and up to numValues.
  // This method assumes that the array is of correct size to
  // accommodate all numValues values. arrayIndex is the value index at which the read
  // values will be put in the array.
  virtual int ReadArrayValues(vtkXMLDataElement* da, vtkIdType arrayIndex, vtkAbstractArray* array,
    vtkIdType startIndex, vtkIdType numValues, FieldType type = OTHER);
 
  // Setup the data array selections for the input's set of arrays.
  void SetDataArraySelections(vtkXMLDataElement* eDSA, vtkDataArraySelection* sel);
 
  int SetFieldDataInfo(vtkXMLDataElement* eDSA, int association, vtkIdType numTuples,
    vtkInformationVector*(&infoVector));
 
  // Check whether the given array element is an enabled array.
  int PointDataArrayIsEnabled(vtkXMLDataElement* ePDA);
  int CellDataArrayIsEnabled(vtkXMLDataElement* eCDA);
 
  // Callback registered with the SelectionObserver.
  static void SelectionModifiedCallback(
    vtkObject* caller, unsigned long eid, void* clientdata, void* calldata);
 
  // Give concrete classes an option to squeeze any output arrays
  // at the end of RequestData.
  virtual void SqueezeOutputArrays(vtkDataObject*) {}
 
  // The vtkXMLDataParser instance used to hide XML reading details.
  vtkXMLDataParser* XMLParser;
 
  // The FieldData element representation.
  vtkXMLDataElement* FieldDataElement;
 
  // The input file's name.
  char* FileName;
 
  // The stream used to read the input.
  istream* Stream;
 
  // Whether this object is reading from a string or a file.
  // Default is 0: read from file.
  vtkTypeBool ReadFromInputString;
 
  // The input string.
  std::string InputString;
 
  // The array selections.
  vtkDataArraySelection* PointDataArraySelection;
  vtkDataArraySelection* CellDataArraySelection;
  vtkDataArraySelection* ColumnArraySelection;
 
  // The observer to modify this object when the array selections are
  // modified.
  vtkCallbackCommand* SelectionObserver;
 
  // Whether there was an error reading the file in RequestInformation.
  int InformationError;
 
  // Whether there was an error reading the file in RequestData.
  int DataError;
 
  // incrementally fine-tuned progress updates.
  virtual void GetProgressRange(float* range);
  virtual void SetProgressRange(const float range[2], int curStep, int numSteps);
  virtual void SetProgressRange(const float range[2], int curStep, const float* fractions);
  virtual void UpdateProgressDiscrete(float progress);
  float ProgressRange[2];
 
  virtual int RequestData(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector);
  virtual int RequestDataObject(vtkInformation* vtkNotUsed(request),
    vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* vtkNotUsed(outputVector))
  {
    return 1;
  }
  virtual int RequestInformation(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector);
  vtkTimeStamp ReadMTime;
 
  // Whether there was an error reading the XML.
  int ReadError;
 
  // For structured data keep track of dimensions empty of cells.  For
  // unstructured data these are always zero.  This is used to support
  // 1-D and 2-D cell data.
  int AxesEmpty[3];
 
  // The timestep currently being read.
  int TimeStep;
  int CurrentTimeStep;
  int NumberOfTimeSteps;
  void SetNumberOfTimeSteps(int num);
  // buffer for reading timestep from the XML file the length is of
  // NumberOfTimeSteps and therefore is always long enough
  int* TimeSteps;
  // Store the range of time steps
  int TimeStepRange[2];
 
  // Now we need to save what was the last time read for each kind of
  // data to avoid rereading it that is to say we need a var for
  // e.g. PointData/CellData/Points/Cells...
  // See SubClass for details with member vars like PointsTimeStep/PointsOffset
 
  // Helper function useful to know if a timestep is found in an array of timestep
  static int IsTimeStepInArray(int timestep, int* timesteps, int length);
 
  vtkDataObject* GetCurrentOutput();
  vtkInformation* GetCurrentOutputInformation();
 
  // Flag for whether DataProgressCallback should actually update
  // progress.
  int InReadData;
 
  virtual void ConvertGhostLevelsToGhostType(FieldType, vtkAbstractArray*, vtkIdType, vtkIdType) {}
 
  void ReadFieldData();
 
private:
  // The stream used to read the input if it is in a file.
  istream* FileStream;
  // The stream used to read the input if it is in a string.
  std::istringstream* StringStream;
  int TimeStepWasReadOnce;
 
  int FileMajorVersion;
  int FileMinorVersion;
 
  vtkDataObject* CurrentOutput;
  vtkInformation* CurrentOutputInformation;
 
private:
  vtkXMLReader(const vtkXMLReader&) = delete;
  void operator=(const vtkXMLReader&) = delete;
 
  vtkCommand* ReaderErrorObserver;
  vtkCommand* ParserErrorObserver;
};
 
#endif