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

  Program:   Visualization Toolkit
  Module:    vtkAnnotationLink.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 vtkAnnotationLink - An algorithm for linking annotations among objects
// .SECTION Description
// vtkAnnotationLink is a simple source filter which outputs the
// vtkAnnotationLayers object stored internally.  Multiple objects may share
// the same annotation link filter and connect it to an internal pipeline so
// that if one object changes the annotation set, it will be pulled into all
// the other objects when their pipelines update.
//
// The shared vtkAnnotationLayers object (a collection of annotations) is
// shallow copied to output port 0.
//
// vtkAnnotationLink can also store a set of domain maps. A domain map is
// simply a table associating values between domains. The domain of each
// column is defined by the array name of the column. The domain maps are
// sent to a multi-block dataset in output port 1.
//
// Output ports 0 and 1 can be set as input ports 0 and 1 to
// vtkConvertSelectionDomain, which can use the domain maps to convert the
// domains of selections in the vtkAnnotationLayers to match a particular
// data object (set as port 2 on vtkConvertSelectionDomain).
//
// The shared vtkAnnotationLayers object also stores a "current selection"
// normally interpreted as the interactive selection of an application.
// As a convenience, this selection is sent to output port 2 so that it
// can be connected to pipelines requiring a vtkSelection.

#ifndef __vtkAnnotationLink_h
#define __vtkAnnotationLink_h

#include "vtkAnnotationLayersAlgorithm.h"

class vtkCommand;
class vtkDataObjectCollection;
class vtkInformation;
class vtkInformationVector;
class vtkSelection;
class vtkTable;

class VTK_GRAPHICS_EXPORT vtkAnnotationLink : public vtkAnnotationLayersAlgorithm
{
public:
  static vtkAnnotationLink *New();
  vtkTypeMacro(vtkAnnotationLink, vtkAnnotationLayersAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  // Description:
  // The annotations to be shared.
  vtkGetObjectMacro(AnnotationLayers, vtkAnnotationLayers);
  virtual void SetAnnotationLayers(vtkAnnotationLayers* layers);

  // Description:
  // Set or get the current selection in the annotation layers.
  virtual void SetCurrentSelection(vtkSelection* sel);
  virtual vtkSelection* GetCurrentSelection();
  
  // Description:
  // The domain mappings.
  void AddDomainMap(vtkTable* map);
  void RemoveDomainMap(vtkTable* map);
  void RemoveAllDomainMaps();
  int GetNumberOfDomainMaps();
  vtkTable* GetDomainMap(int i);

  // Description:
  // Get the mtime of this object.
  virtual unsigned long GetMTime();
  
protected:
  vtkAnnotationLink();
  ~vtkAnnotationLink();
  
  // Description:
  // Called to process modified events from its vtkAnnotationLayers.
  virtual void ProcessEvents(vtkObject* caller, unsigned long eventId, 
    void* callData);

  // Description:
  // Set up input ports.
  virtual int FillInputPortInformation(int, vtkInformation*);
  
  // Description:
  // Set up output ports.
  virtual int FillOutputPortInformation(int, vtkInformation*);
  
  // Description:
  // Copy the data to the output objects.
  void ShallowCopyToOutput(
    vtkAnnotationLayers* input,
    vtkAnnotationLayers* output,
    vtkSelection* sel);

  // Description:
  // Shallow copy the internal selection to the output.
  virtual int RequestData(
    vtkInformation *info,
    vtkInformationVector **inVector,
    vtkInformationVector *outVector);

  // Description:
  // The shared selection.
  vtkAnnotationLayers* AnnotationLayers;

  // Description:
  // The mappings between domains.
  vtkDataObjectCollection* DomainMaps;
    

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

  //BTX
  class Command;
  friend class Command;
  Command* Observer;
  //ETX
};

#endif