implementation.C

/*
 * This file is part of the "Archon" framework.
 * (http://files3d.sourceforge.net)
 *
 * Copyright © 2006 by Kristian Spangsege and Brian Kristiansen.
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation under the terms of the GNU General Public License is
 * hereby granted. No representations are made about the suitability of
 * this software for any purpose. It is provided "as is" without express
 * or implied warranty. See the GNU General Public License
 * (http://www.gnu.org/copyleft/gpl.html) for more details.
 *
 * The characters in this file are ISO8859-1 encoded.
 *
 * The documentation in this file is in "Doxygen" style
 * (http://www.doxygen.org).
 */

#include <vector>

#include <archon/util/ref.H>
#include <archon/display/implementation.H>

#include <archon/config.h>

#ifndef X_DISPLAY_MISSING
#include <archon/display/x11/implementation.H>
#endif

namespace Archon
{
  namespace Display
  {
    using namespace std;
    using namespace Archon::Utilities;

    namespace
    {
      struct ImplementationRegistry
      {
        ImplementationRegistry()
        {
#ifndef X_DISPLAY_MISSING
          implementations.push_back(getImplementationX11());
#endif
        }

        vector<Ref<Archon::Display::Implementation> > implementations;
      };

      const ImplementationRegistry *getImplementationRegistry()
      {
        static ImplementationRegistry registry;
        return &registry;
      }
    }


    Ref<Implementation> getDefaultImplementation() throw(NoImplementationException)
    {
      const ImplementationRegistry *r = getImplementationRegistry();
      if(r->implementations.empty()) ARCHON_THROW(NoImplementationException);
      return r->implementations[0];
    }

    int getNumberOfImplementations()
    {
      return getImplementationRegistry()->implementations.size();
    }

    Ref<Implementation> getImplementation(int index) throw(out_of_range)
    {
      return getImplementationRegistry()->implementations.at(index);
    }
  }
}

---