src/error.h

   1 ///
   2 /// \file       error.h
   3 ///             Common exception classes for the Barry library
   4 ///
   5
   6 /*
   7     Copyright (C) 2005-2008, Net Direct Inc. (http://www.netdirect.ca/)
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17
  18     See the GNU General Public License in the COPYING file at the
  19     root directory of this project for more details.
  20 */
  21
  22 #ifndef __BARRY_ERROR_H__
  23 #define __BARRY_ERROR_H__
  24
  25 #include "dll.h"
  26 #include <stdexcept>
  27
  28 namespace Barry {
  29
  30 /// \addtogroup exceptions
  31 /// @{
  32
  33 //
  34 // Error class
  35 //
  36 /// The base class for any future derived exceptions.
  37 /// Can be thrown on any protocol error.
  38 ///
  39 class BXEXPORT Error : public std::runtime_error
  40 {
  41 public:
  42         Error(const std::string &str) : std::runtime_error(str) {}
  43 };
  44
  45
  46 //
  47 // BadPassword
  48 //
  49 /// A bad or unknown password when talking to the device.
  50 /// Can be thrown in the following instances:
  51 ///
  52 ///     - no password provided and the device requests one
  53 ///     - device rejected the available password
  54 ///     - too few remaining tries left... Barry will refuse to keep
  55 ///             trying passwords if there are fewer than
  56 ///             6 tries remaining.  In this case, out_of_tries()
  57 ///             will return true.
  58 ///
  59 ///
  60 class BXEXPORT BadPassword : public Barry::Error
  61 {
  62         int m_remaining_tries;
  63         bool m_out_of_tries;
  64
  65 public:
  66         BadPassword(const std::string &str, int remaining_tries,
  67                 bool out_of_tries)
  68                 : Barry::Error(str),
  69                 m_remaining_tries(remaining_tries),
  70                 m_out_of_tries(out_of_tries)
  71                 {}
  72         int remaining_tries() const { return m_remaining_tries; }
  73         bool out_of_tries() const { return m_out_of_tries; }
  74 };
  75
  76 //
  77 // BadSize
  78 //
  79 /// Unexpected packet size, or not enough data.
  80 ///
  81 class BXEXPORT BadSize : public Barry::Error
  82 {
  83         unsigned int m_packet_size,
  84                 m_data_buf_size,
  85                 m_required_size;
  86
  87         BXLOCAL static std::string GetMsg(unsigned int p, unsigned int d, unsigned int r);
  88
  89 public:
  90         BadSize(unsigned int packet_size,
  91                 unsigned int data_buf_size,
  92                 unsigned int required_size)
  93                 : Barry::Error(GetMsg(packet_size, data_buf_size, required_size)),
  94                 m_packet_size(packet_size),
  95                 m_data_buf_size(data_buf_size),
  96                 m_required_size(required_size)
  97                 {}
  98         unsigned int packet_size() const { return m_packet_size; }
  99         unsigned int data_buf_size() const { return m_data_buf_size; }
 100         unsigned int required_size() const { return m_required_size; }
 101 };
 102
 103 //
 104 // ErrnoError
 105 //
 106 /// System error that provides an errno error code.
 107 ///
 108 class ErrnoError : public Barry::Error
 109 {
 110         int m_errno;
 111
 112         static std::string GetMsg(const std::string &msg, int err);
 113
 114 public:
 115         ErrnoError(const std::string &msg, int err)
 116                 : Barry::Error(GetMsg(msg, err))
 117                 , m_errno(err)
 118                 {}
 119
 120         int error_code() const { return m_errno; }
 121 };
 122
 123 /// @}
 124
 125 } // namespace Barry
 126
 127 #endif
 128