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

  Program:   Visualization Toolkit
  Module:    vtkDynamicLoader.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 vtkDynamicLoader - class interface to system dynamic libraries
// .SECTION Description
// vtkDynamicLoader provides a portable interface to loading dynamic
// libraries into a process.
// .SECTION See Also
// A more portable and lightweight solution is kwsys::DynamicLoader

#ifndef __vtkDynamicLoader_h
#define __vtkDynamicLoader_h

#include "vtkObject.h"
#include <vtksys/DynamicLoader.hxx>

//BTX
typedef vtksys::DynamicLoader::LibraryHandle vtkLibHandle;
// Cannot use this as this is a void (*)() but VTK old API used to be void*
typedef vtksys::DynamicLoader::SymbolPointer vtkSymbolPointer;
//ETX

class VTK_COMMON_EXPORT vtkDynamicLoader : public vtkObject
{
public:
  static vtkDynamicLoader* New();
  vtkTypeRevisionMacro(vtkDynamicLoader,vtkObject);

  //BTX
  // Description:
  // Load a dynamic library into the current process.
  // The returned vtkLibHandle can be used to access the symbols in the
  // library.
  static vtkLibHandle OpenLibrary(const char*);

  // Description:
  // Attempt to detach a dynamic library from the
  // process.  A value of true is returned if it is successful.
  static int CloseLibrary(vtkLibHandle);

  // Description:
  // Find the address of the symbol in the given library
  //static vtkSymbolPointer GetSymbolAddress(vtkLibHandle, const char*);
  static void* GetSymbolAddress(vtkLibHandle, const char*);
  //ETX

  // Description:
  // Return the library prefix for the given architecture
  static const char* LibPrefix();

  // Description:
  // Return the library extension for the given architecture
  static const char* LibExtension();

  // Description:
  // Return the last error produced from a calls made on this class.
  static const char* LastError();

protected:
  vtkDynamicLoader() {};
  ~vtkDynamicLoader() {};

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

#endif
