file.hh

// Copyright (C) 2001, 2002, 2003, 2004  EPITA Research and Development Laboratory
//
// This file is part of the Olena Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License version 2 as published by the
// Free Software Foundation.
//
// 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING.  If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
// MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free
// software library without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to
// produce an executable, this file does not by itself cause the
// resulting executable to be covered by the GNU General Public
// License.  This exception does not however invalidate any other
// reasons why the executable file might be covered by the GNU General
// Public License.

#ifndef OLENA_IO_FILE_HH
# define OLENA_IO_FILE_HH

# include <oln/io/stream_wrapper.hh>

# include <fstream>
# include <sys/types.h>
# include <dirent.h>

namespace oln {

  namespace io {

    namespace internal {

      template<>
      struct stream_wrapper<StreamFile>
      {
        static const std::string& 
        name()
        { 
          static const std::string name_("file:"); return name_; 
        }

        
        static bool 
        knows_ext(const std::string&) // knows all extensions
        { 
          return true; 
        }

        static std::istream* 
        wrap_in(std::string& name)
        {
          std::ifstream* in = new std::ifstream(name.c_str());
          if (!in->fail())
            return in;
          delete in;
          return 0;
        }

        static std::ostream* 
        wrap_out(std::string& name)
        {
          std::ofstream* out = new std::ofstream(name.c_str());
          if (!out->fail())
            return out;
          delete out;
          return 0;
        }

        static void 
        find(std::list<std::string>& names, const std::string& name)
        {
          // extract dir/base from name
          int pos = name.rfind('/');
          std::string base(name, pos+1);
          //FIXME: add a '.' at the end of base if not already
          std::string dir;
          if (pos >= 0)
            dir.assign(name, 0, pos+1);
          else
            dir = "./";
          // add files in dir starting by base.
          if (DIR* d = opendir(dir.c_str()))
            {
              struct dirent* ent;
              while ((ent = readdir(d)))
                if (!strncmp(base.c_str(), ent->d_name, base.size()))
                  names.push_back(dir + ent->d_name);
              closedir(d);
            }
        }

      };

    } // end of namespace internal

  } // end of namespace io

} // end of namespace oln


#endif // OLENA_IO_FILE_HH

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