File: vtkCompositeDataSet.h

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

  Program:   Visualization Toolkit
  Module:    vtkCompositeDataSet.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.

=========================================================================*/
// .NAME vtkCompositeDataSet - abstract superclass for composite
// (multi-block or AMR) datasets
// .SECTION Description
// vtkCompositeDataSet is an abstract class that represents a collection
// of datasets (including other composite datasets). It
// provides an interface to access the datasets through iterators.
// vtkCompositeDataSet provides methods that are used by subclasses to store the
// datasets.
// vtkCompositeDataSet provides the datastructure for a full tree
// representation. Subclasses provide the semantics for it and control how
// this tree is built.

// .SECTION See Also
// vtkCompositeDataIterator

#ifndef vtkCompositeDataSet_h
#define vtkCompositeDataSet_h

#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkDataObject.h"

class vtkCompositeDataIterator;
class vtkCompositeDataSetInternals;
class vtkInformation;
class vtkInformationStringKey;
class vtkInformationIntegerKey;

class VTKCOMMONDATAMODEL_EXPORT vtkCompositeDataSet : public vtkDataObject
{
public:
  vtkTypeMacro(vtkCompositeDataSet, vtkDataObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Return a new iterator (the iterator has to be deleted by user).
  virtual vtkCompositeDataIterator* NewIterator() =0;

  // Description:
  // Return class name of data type (see vtkType.h for
  // definitions).
  virtual int GetDataObjectType() {return VTK_COMPOSITE_DATA_SET;}

  // Description:
  // Copies the tree structure from the input. All pointers to non-composite
  // data objects are intialized to NULL. This also shallow copies the meta data
  // associated with all the nodes.
  virtual void CopyStructure(vtkCompositeDataSet* input)=0;

  // Description:
  // Sets the data set at the location pointed by the iterator.
  // The iterator does not need to be iterating over this dataset itself. It can
  // be any composite datasite with similar structure (achieved by using
  // CopyStructure).
  virtual void SetDataSet(vtkCompositeDataIterator* iter, vtkDataObject* dataObj)=0;

  // Description:
  // Returns the dataset located at the positiong pointed by the iterator.
  // The iterator does not need to be iterating over this dataset itself. It can
  // be an iterator for composite dataset with similar structure (achieved by
  // using CopyStructure).
  virtual vtkDataObject* GetDataSet(vtkCompositeDataIterator* iter)=0;


  // Description:
  // Return the actual size of the data in kibibytes (1024 bytes). This number
  // is valid only after the pipeline has updated.
  virtual unsigned long GetActualMemorySize();

  // Description:
  // Retrieve an instance of this class from an information object.
  static vtkCompositeDataSet* GetData(vtkInformation* info);
  static vtkCompositeDataSet* GetData(vtkInformationVector* v, int i=0);

  // Description:
  // Restore data object to initial state,
  virtual void Initialize();

  // Description:
  // Shallow and Deep copy.
  virtual void ShallowCopy(vtkDataObject *src);
  virtual void DeepCopy(vtkDataObject *src);

  // Description:
  // Returns the total number of points of all blocks. This will
  // iterate over all blocks and call GetNumberOfPoints() so it
  // might be expansive.
  virtual vtkIdType GetNumberOfPoints();

  // Description:
  // Key used to put node name in the meta-data associated with a node.
  static vtkInformationStringKey* NAME();

  // Description:
  // Key used to indicate that the current process can load the data
  // in the node.  Used for parallel readers where the nodes are assigned
  // to the processes by the reader to indicate further down the pipeline
  // which nodes will be on which processes.
  // ***THIS IS AN EXPERIMENTAL KEY SUBJECT TO CHANGE WITHOUT NOTICE***
  static vtkInformationIntegerKey* CURRENT_PROCESS_CAN_LOAD_BLOCK();

 protected:
  vtkCompositeDataSet();
  virtual ~vtkCompositeDataSet();
 private:

  vtkCompositeDataSet(const vtkCompositeDataSet&); // Not implemented.
  void operator=(const vtkCompositeDataSet&); // Not implemented.

};

#endif