source: trunk/yat/utility/OptionFile.cc @ 1628

// $Id: OptionFile.cc 1628 2008-11-17 21:24:18Z peter $

/*
  Copyright (C) 2007 Jari Häkkinen, Peter Johansson
  Copyright (C) 2008 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 3 of the
  License, or (at your option) any later version.

  The yat 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 yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include "OptionFile.h"
#include "Exception.h"
#include "FileUtil.h"

#include <string>

namespace theplu {
namespace yat {
namespace utility {


  OptionFile::OptionFile(CommandLine& cmd, std::string flag, std::string desc, 
                         bool required, bool exist, std::string bits)
    : OptionArg<std::string>(cmd, flag, desc, required), exist_(exist), 
      bits_(bits) {}


  OptionFile::~OptionFile(void)
  {
  }


  void OptionFile::do_validate2() const
  {   
    if (!present())
      return;
    FileUtil fu(value().c_str());
    bool exists=false;
    try {
      exists = fu.exists();
    }
    catch (IO_error& e) {
      std::stringstream ss;
      ss << "cannot stat `" << value() << "': " << strerror(errno);
      errno = 0;
      throw cmd_error(ss.str());
    }
    if (exist_ && !exists){
      std::stringstream ss;
      ss << "cannot stat `" << value() << "': No such file or directory";
      throw cmd_error(ss.str());
    }
    if (fu.permissions(bits_)) {
      // Peter, this loop is stupid but I wanna differentiate the error message
      for (std::string::const_iterator iter; iter!=bits_.end(); ++iter){
        if (*iter=='r' && fu.permissions("r")){
          std::stringstream ss;
          ss << "cannot open `" << value() << "' for reading: Permission denied";
          throw cmd_error(ss.str());
        }
        else if (*iter=='w' && fu.permissions("w")){
          std::stringstream ss;
          ss << "cannot create file `" << value() 
             << "': Permission denied";
          throw cmd_error(ss.str());
        }
        else if (*iter=='d' && fu.permissions("d")){
          std::stringstream ss;
          ss << value() 
             << "': Not a directory";
          throw cmd_error(ss.str());
        }
      }
      std::stringstream ss;
      ss << value() << ": Permission denied";
      throw cmd_error(ss.str());
    }
  }


}}} // of namespace utility, yat, and theplu