/* -*- mode: C++; indent-tabs-mode: nil; -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library.

  *

  * Copyright (C) 2003-2008

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #ifndef LEMON_ERROR_H

 #define LEMON_ERROR_H

 /// \ingroup exceptions

 /// \file

 /// \brief Basic exception classes and error handling.

 #include <exception>

 #include <string>

 #include <sstream>

 #include <iostream>

 #include <cstdlib>

 #include <memory>

 namespace lemon {

   /// \addtogroup exceptions

   /// @{

   /// \brief Generic exception class.

   ///

   /// Base class for exceptions used in LEMON.

   ///

   class Exception : public std::exception {

   public:

     ///Constructor

     Exception() throw() {}

     ///Virtual destructor

     virtual ~Exception() throw() {}

     ///A short description of the exception

     virtual const char* what() const throw() {

       return "lemon::Exception";

     }

   };

   /// \brief Input-Output error

   ///

   /// This exception is thrown when a file operation cannot be

   /// succeeded.

   class IoError : public Exception {

   protected:

     std::string _message;

     std::string _file;

     mutable std::string _what;

   public:

     /// Copy constructor

     IoError(const IoError &error) throw() : Exception() {

       message(error._message);

       file(error._file);

     }

     /// Constructor

     explicit IoError(const char *message) throw() {

       IoError::message(message);

     }

     /// Constructor

     explicit IoError(const std::string &message) throw() {

       IoError::message(message);

     }

     /// Constructor

     explicit IoError(const char *message,

                      const std::string &file) throw() {

       IoError::message(message);

       IoError::file(file);

     }

     /// Constructor

     explicit IoError(const std::string &message,

                      const std::string &file) throw() {

       IoError::message(message);

       IoError::file(file);

     }

     /// Virtual destructor

     virtual ~IoError() throw() {}

     /// Set the error message

     void message(const char *message) throw() {

       try {

         _message = message;

       } catch (...) {}

     }

     /// Set the error message

     void message(const std::string& message) throw() {

       try {

         _message = message;

       } catch (...) {}

     }

     /// Set the file name

     void file(const std::string &file) throw() {

       try {

         _file = file;

       } catch (...) {}

     }

     /// Returns the error message

     const std::string& message() const throw() {

       return _message;

     }

     /// \brief Returns the filename

     ///

     /// Returns the filename or an empty string if it was not specified.

     const std::string& file() const throw() {

       return _file;

     }

     /// \brief Returns a short error message

     ///

     /// Returns a short error message which contains the message and the

     /// file name.

     virtual const char* what() const throw() {

       try {

         _what.clear();

         std::ostringstream oss;

         oss << "lemon:IoError" << ": ";

         oss << _message;

         if (!_file.empty()) {

           oss << " ('" << _file << "')";

         }

         _what = oss.str();

       }

       catch (...) {}

       if (!_what.empty()) return _what.c_str();

       else return "lemon:IoError";

     }

   };

   /// \brief Format error

   ///

   /// This exception is thrown when an input file has wrong

   /// format or a data representation is not legal.

   class FormatError : public Exception {

   protected:

     std::string _message;

     std::string _file;

     int _line;

     mutable std::string _what;

   public:

     /// Copy constructor

     FormatError(const FormatError &error) throw() : Exception() {

       message(error._message);

       file(error._file);

       line(error._line);

     }

     /// Constructor

     explicit FormatError(const char *message) throw() {

       FormatError::message(message);

       _line = 0;

     }

     /// Constructor

     explicit FormatError(const std::string &message) throw() {

       FormatError::message(message);

       _line = 0;

     }

     /// Constructor

     explicit FormatError(const char *message,

                          const std::string &file, int line = 0) throw() {

       FormatError::message(message);

       FormatError::file(file);

       FormatError::line(line);

     }

     /// Constructor

     explicit FormatError(const std::string &message,

                          const std::string &file, int line = 0) throw() {

       FormatError::message(message);

       FormatError::file(file);

       FormatError::line(line);

     }

     /// Virtual destructor

     virtual ~FormatError() throw() {}

     /// Set the line number

     void line(int line) throw() { _line = line; }

     /// Set the error message

     void message(const char *message) throw() {

       try {

         _message = message;

       } catch (...) {}

     }

     /// Set the error message

     void message(const std::string& message) throw() {

       try {

         _message = message;

       } catch (...) {}

     }

     /// Set the file name

     void file(const std::string &file) throw() {

       try {

         _file = file;

       } catch (...) {}

     }

     /// \brief Returns the line number

     ///

     /// Returns the line number or zero if it was not specified.

     int line() const throw() { return _line; }

     /// Returns the error message

     const std::string& message() const throw() {

       return _message;

     }

     /// \brief Returns the filename

     ///

     /// Returns the filename or an empty string if it was not specified.

     const std::string& file() const throw() {

       return _file;

     }

     /// \brief Returns a short error message

     ///

     /// Returns a short error message which contains the message, the

     /// file name and the line number.

     virtual const char* what() const throw() {

       try {

         _what.clear();

         std::ostringstream oss;

         oss << "lemon:FormatError" << ": ";

         oss << _message;

         if (!_file.empty() || _line != 0) {

           oss << " (";

           if (!_file.empty()) oss << "in file '" << _file << "'";

           if (!_file.empty() && _line != 0) oss << " ";

           if (_line != 0) oss << "at line " << _line;

           oss << ")";

         }

         _what = oss.str();

       }

       catch (...) {}

       if (!_what.empty()) return _what.c_str();

       else return "lemon:FormatError";

     }

   };

   /// @}

 }

 #endif // LEMON_ERROR_H