vtkInformationKey.h

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

  Program:   Visualization Toolkit
  Module:    vtkInformationKey.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 vtkInformationKey_h
#define vtkInformationKey_h

#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObjectBase.h"
#include "vtkObject.h" // Need vtkTypeMacro

class vtkInformation;

class VTKCOMMONCORE_EXPORT vtkInformationKey : public vtkObjectBase
{
public:
  vtkTypeMacro(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 *from, vtkInformation *to)
    { this->ShallowCopy(from, to); }

  virtual int Has(vtkInformation* info);

  virtual void Remove(vtkInformation* info);

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


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


  virtual bool NeedToExecute(vtkInformation* vtkNotUsed(pipelineInfo),
                             vtkInformation* vtkNotUsed(dobjInfo)) {return false;}


  virtual void StoreMetaData(vtkInformation* vtkNotUsed(request),
                             vtkInformation* vtkNotUsed(pipelineInfo),
                             vtkInformation* vtkNotUsed(dobjInfo)) {}


  virtual void CopyDefaultInformation(vtkInformation* vtkNotUsed(request),
                                      vtkInformation* vtkNotUsed(fromInfo),
                                      vtkInformation* vtkNotUsed(toInfo)) {}

protected:
  char* Name;
  char* Location;

#define vtkInformationKeySetStringMacro(name) \
virtual void Set##name (const char* _arg) \
  { \
  if ( this->name == NULL && _arg == NULL) { return;} \
  if ( this->name && _arg && (!strcmp(this->name,_arg))) { return;} \
  delete [] this->name; \
  if (_arg) \
    { \
    size_t n = strlen(_arg) + 1; \
    char *cp1 =  new char[n]; \
    const char *cp2 = (_arg); \
    this->name = cp1; \
    do { *cp1++ = *cp2++; } while ( --n ); \
    } \
   else \
    { \
    this->name = NULL; \
    } \
  }

  vtkInformationKeySetStringMacro(Name);
  vtkInformationKeySetStringMacro(Location);

  // Set/Get the value associated with this key instance in the given
  // information object.
  void SetAsObjectBase(vtkInformation* info, vtkObjectBase* value);
  const vtkObjectBase* GetAsObjectBase(vtkInformation* info) const;
  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 vtkInformationKeySubclassMacro(CLASS, NAME, type, super)    \
  static vtkInformation##type##Key* CLASS##_##NAME =          \
    new vtkInformation##type##Key(#NAME, #CLASS);             \
  vtkInformation##super##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