//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_DYNAMICLIBRARY
#define OSG_DYNAMICLIBRARY 1

#include <osg/Referenced>
#include <osgDB/Export>

#include <string>


namespace osgDB {

/** DynamicLibrary - encapsulates the loading and unloading of dynamic libraries,
    typically used for loading ReaderWriter plug-ins.
*/
class OSGDB_EXPORT DynamicLibrary : public osg::Referenced
{
    public:

        typedef void*   HANDLE;
        typedef void*   PROC_ADDRESS;
        
        /** returns a pointer to a DynamicLibrary object on successfully
          * opening of library returns NULL on failure.
          */
        static DynamicLibrary* loadLibrary(const std::string& libraryName);

        /** return name of library stripped of path.*/
        const std::string& getName() const     { return _name; }

        /** return name of library including full path to it.*/
        const std::string& getFullName() const { return _fullName; }

        /** return handle to .dso/.dll dynamic library itself.*/
        HANDLE             getHandle() const   { return _handle; }

        /** return address of function located in library.*/
        PROC_ADDRESS       getProcAddress(const std::string& procName);

    protected:

        /** disallow default constructor.*/
        DynamicLibrary():osg::Referenced() {}
        /** disallow copy constructor.*/
        DynamicLibrary(const DynamicLibrary&):osg::Referenced() {}
        /** disallow copy operator.*/
        DynamicLibrary& operator == (const DynamicLibrary&) { return *this; }
        
        /** Disallow public construction so that users have to go
          * through loadLibrary() above which returns NULL on 
          * failure, a valid DynamicLibrary object on success.
          */
        DynamicLibrary(const std::string& name,HANDLE handle);
        ~DynamicLibrary();

        HANDLE          _handle;
        std::string     _name;
        std::string     _fullName;

};

}

#endif // __DYNAMIC_LIBRARY_H