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

  Program:   Visualization Toolkit
  Module:    vtkInformationKeyLookup.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.

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

/**
 * @class   vtkInformationKeyLookup
 * @brief   Find vtkInformationKeys from name and
 * location strings.
*/

#ifndef vtkInformationKeyLookup_h
#define vtkInformationKeyLookup_h

#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObject.h"

#include <map> // For std::map
#include <utility> // For std::pair
#include <string> // For std::string

class vtkInformationKey;

class VTKCOMMONCORE_EXPORT vtkInformationKeyLookup: public vtkObject
{
public:
    static vtkInformationKeyLookup* New();
    vtkTypeMacro(vtkInformationKeyLookup, vtkObject)

    /**
     * Lists all known keys.
     */
    void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

    /**
     * Find an information key from name and location strings. For example,
     * Find("GUI_HIDE", "vtkAbstractArray") returns vtkAbstractArray::GUI_HIDE.
     * Note that this class only knows about keys in modules that are currently
     * linked to the running executable.
     */
    static vtkInformationKey* Find(const std::string &name,
                                   const std::string &location);

protected:
    vtkInformationKeyLookup();
    ~vtkInformationKeyLookup() VTK_OVERRIDE;

    friend class vtkInformationKey;

    /**
     * Add a key to the KeyMap. This is done automatically in the
     * vtkInformationKey constructor.
     */
    static void RegisterKey(vtkInformationKey *key,
                            const std::string &name,
                            const std::string &location);

private:
    vtkInformationKeyLookup(const vtkInformationKeyLookup&) VTK_DELETE_FUNCTION;
    void operator=(const vtkInformationKeyLookup&) VTK_DELETE_FUNCTION;

    typedef std::pair<std::string, std::string> Identifier; // Location, Name
    typedef std::map<Identifier, vtkInformationKey*> KeyMap;

    // Using a static function / variable here to ensure static initialization
    // works as intended, since key objects are static, too.
    static KeyMap& Keys();
};

#endif // vtkInformationKeyLookup_h