PluginLoader.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2014  Mark A Lindner

   This file is part of commonc++.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_PluginLoader_hxx
#define __ccxx_PluginLoader_hxx

#include <commonc++/LoadableModule.h++>

namespace ccxx {

class COMMONCPP_API Plugin;

class COMMONCPP_API PluginLoader
{
 public:

  PluginLoader(const String& path = String::null);

  ~PluginLoader();

  inline void setPath(const String& path)
  { _module.setPath(path); }

  inline String getPath() const
  { return(_module.getPath()); }

  void load()
  { _module.open(); }

  inline void unload()
  { _module.close(); }

  inline bool isLoaded() const
  { return(_module.isOpen()); }

  String getName();

  String getVersion();

  String getAuthor();

  String getClassName();

  String getBuildDate();

  template<class T> T* newInstance()
  {
    Plugin *p = NULL;
    try
    {
      p = _newInstance();
    }
    catch(...) { }

    if(! p)
      return(NULL);

    T* plugin = NULL;
    plugin = dynamic_cast<T *>(p);
    if(! plugin)
      delete p;

    return plugin;
  }

 private:

  String _fetchString(const char* symbol);
  Plugin* _newInstance();

  LoadableModule _module;

  CCXX_COPY_DECLS(PluginLoader);
};

} // namespace ccxx

#endif // __ccxx_PluginLoader_hxx