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

  Program:   Visualization Toolkit
  Module:    vtkCompositeDataIterator.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 vtkCompositeDataIterator - superclass for composite data iterators
// .SECTION Description
// vtkCompositeDataIterator provides an interface for accessing datasets
// in a collection (vtkCompositeDataIterator). 
#ifndef __vtkCompositeDataIterator_h
#define __vtkCompositeDataIterator_h

#include "vtkObject.h"

class vtkCompositeDataSet;
class vtkCompositeDataSetInternals;
class vtkCompositeDataSetIndex;
class vtkDataObject;
class vtkInformation;

class VTK_FILTERING_EXPORT vtkCompositeDataIterator : public vtkObject
{
public:
  static vtkCompositeDataIterator* New();
  vtkTypeMacro(vtkCompositeDataIterator, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Set the composite dataset this iterator is iterating over. 
  // Must be set before traversal begins.
  virtual void SetDataSet(vtkCompositeDataSet* ds);
  vtkGetObjectMacro(DataSet, vtkCompositeDataSet);

  // Description:
  // Begin iterating over the composite dataset structure.
  virtual void InitTraversal();

  // Description:
  // Begin iterating over the composite dataset structure in reverse order.
  virtual void InitReverseTraversal();

  // Description:
  // Move the iterator to the beginning of the collection.
  virtual void GoToFirstItem();

  // Description:
  // Move the iterator to the next item in the collection.
  virtual void GoToNextItem();

  // Description:
  // Test whether the iterator is finished with the traversal.
  // Returns 1 for yes, and 0 for no. 
  // It is safe to call any of the GetCurrent...() methods only when
  // IsDoneWithTraversal() returns 0.
  virtual int IsDoneWithTraversal();

  // Description:
  // Returns the current item. Valid only when IsDoneWithTraversal() returns 0.
  virtual vtkDataObject* GetCurrentDataObject();

  // Description:
  // Returns the meta-data associated with the current item. This will allocate
  // a new vtkInformation object is none is already present. Use
  // HasCurrentMetaData to avoid unnecessary creation of vtkInformation objects.
  virtual vtkInformation* GetCurrentMetaData();

  // Description:
  // Returns if the a meta-data information object is present for the current
  // item. Return 1 on success, 0 otherwise.
  virtual int HasCurrentMetaData();

  // Description:
  // If VisitOnlyLeaves is true, the iterator will only visit nodes
  // (sub-datasets) that are not composite. If it encounters a composite
  // data set, it will automatically traverse that composite dataset until
  // it finds non-composite datasets. With this options, it is possible to
  // visit all non-composite datasets in tree of composite datasets
  // (composite of composite of composite for example :-) ) If
  // VisitOnlyLeaves is false, GetCurrentDataObject() may return
  // vtkCompositeDataSet. By default, VisitOnlyLeaves is 1.
  vtkSetMacro(VisitOnlyLeaves, int);
  vtkGetMacro(VisitOnlyLeaves, int);
  vtkBooleanMacro(VisitOnlyLeaves, int);

  // Description:
  // If TraverseSubTree is set to true, the iterator will visit the entire tree
  // structure, otherwise it only visits the first level children. Set to 1 by
  // default.
  vtkSetMacro(TraverseSubTree, int);
  vtkGetMacro(TraverseSubTree, int);
  vtkBooleanMacro(TraverseSubTree, int);


  // Description:
  // If SkipEmptyNodes is true, then NULL datasets will be skipped. Default is
  // true.
  vtkSetMacro(SkipEmptyNodes, int);
  vtkGetMacro(SkipEmptyNodes, int);
  vtkBooleanMacro(SkipEmptyNodes, int);

  // Description:
  // Flat index is an index obtained by traversing the tree in preorder.
  // This can be used to uniquely identify nodes in the tree.
  // Not valid if IsDoneWithTraversal() returns true.
  unsigned int GetCurrentFlatIndex();

  // Description:
  // Returns if the iteration is in reverse order.
  vtkGetMacro(Reverse, int);

//BTX
protected:
  vtkCompositeDataIterator();
  virtual ~vtkCompositeDataIterator();

  // Takes the current location to the next dataset. This traverses the tree in
  // preorder fashion.
  // If the current location is a composite dataset, next is its 1st child dataset.
  // If the current is not a composite dataset, then next is the next dataset.
  // This method gives no guarantees  whether the current dataset will be
  // non-null or leaf.
  void NextInternal();

  // Description:
  // Returns the index for the current data object.
  vtkCompositeDataSetIndex GetCurrentIndex();

  // Needs access to GetCurrentIndex().
  friend class vtkCompositeDataSet;

  unsigned int CurrentFlatIndex;

  int SkipEmptyNodes;
  int TraverseSubTree;
  int Reverse;
  int VisitOnlyLeaves;
  vtkCompositeDataSet* DataSet;
private:
  vtkCompositeDataIterator(const vtkCompositeDataIterator&); // Not implemented.
  void operator=(const vtkCompositeDataIterator&); // Not implemented.

  class vtkInternals;
  vtkInternals* Internals;
  friend class vtkInternals;

  // Description:
  // Helper method used by vtkInternals to get access to the internals of
  // vtkCompositeDataSet.
  vtkCompositeDataSetInternals* GetInternals(vtkCompositeDataSet*);

  // Cannot be called when this->IsDoneWithTraversal() return 1.
  void UpdateLocation();
//ETX
};

#endif