vtkInformationKey.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkInformationKey.h,v $

  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 __vtkInformationKey_h
#define __vtkInformationKey_h

#include "vtkObjectBase.h"
#include "vtkObject.h" // Need vtkTypeRevisionMacro

class vtkInformation;

class VTK_FILTERING_EXPORT vtkInformationKey : public vtkObjectBase
{
public:
  vtkTypeRevisionMacro(vtkInformationKey,vtkObjectBase);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void Register(vtkObjectBase*);

  virtual void UnRegister(vtkObjectBase*);

  const char* GetName();

  const char* GetLocation();


  vtkInformationKey(const char* name, const char* location);
  ~vtkInformationKey();

  virtual void ShallowCopy(vtkInformation* from, vtkInformation* to)=0;


  virtual void DeepCopy(vtkInformation *vtkNotUsed(from), 
    vtkInformation *vtkNotUsed(to)) {}

  virtual void Remove(vtkInformation* info);

  virtual void Report(vtkInformation* info, vtkGarbageCollector* collector);


  void Print(vtkInformation* info);
  virtual void Print(ostream& os, vtkInformation* info);

protected:
  const char* Name;
  const char* Location;

  // Set/Get the value associated with this key instance in the given
  // information object.
  void SetAsObjectBase(vtkInformation* info, vtkObjectBase* value);
  vtkObjectBase* GetAsObjectBase(vtkInformation* info);

  // Report the object associated with this key instance in the given
  // information object to the collector.
  void ReportAsObjectBase(vtkInformation* info,
                          vtkGarbageCollector* collector);

  // Helper for debug leaks support.
  void ConstructClass(const char*);

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

// Macros to define an information key instance in a C++ source file.
// The corresponding method declaration must appear in the class
// definition in the header file.
#define vtkInformationKeyMacro(CLASS, NAME, type)                      \
  static vtkInformation##type##Key* CLASS##_##NAME =                   \
         new vtkInformation##type##Key(#NAME, #CLASS);                 \
  vtkInformation##type##Key* CLASS::NAME() { return CLASS##_##NAME; }
#define vtkInformationKeyRestrictedMacro(CLASS, NAME, type, required)       \
  static vtkInformation##type##Key* CLASS##_##NAME =                        \
         new vtkInformation##type##Key(#NAME, #CLASS, required);            \
  vtkInformation##type##Key* CLASS::NAME() { return CLASS##_##NAME; }

#endif

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