1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
|
/* Copyright © 2005-2006 Roger Leigh <rleigh@debian.org>
*
* schroot 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 2 of the License, or
* (at your option) any later version.
*
* schroot 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*********************************************************************/
#ifndef SBUILD_ERROR_H
#define SBUILD_ERROR_H
#include <map>
#include <stdexcept>
#include <string>
#include <typeinfo>
#include <boost/format.hpp>
#include <boost/type_traits.hpp>
namespace sbuild
{
/**
* Error exception base class.
*/
class error_base : public std::runtime_error
{
protected:
/**
* The constructor.
*
* @param error the error message.
*/
error_base(std::string const& error):
runtime_error(error),
reason()
{
}
/**
* The constructor.
*
* @param error the error message.
* @param reason further information about the error
*/
error_base(std::string const& error,
std::string const& reason):
runtime_error(error),
reason(reason)
{
}
public:
/// The destructor.
virtual ~error_base () throw ()
{}
/**
* Get the reason for the error.
*
* @returns the reason.
*/
virtual const char *
why () const throw ()
{
return this->reason.c_str();
}
/**
* Get the reason for the error.
*
* @returns the reason.
*/
std::string const&
get_reason () const
{
return this->reason;
}
/**
* Set the reason for the error.
*
* @param reason further information about the error
*/
void
set_reason (std::string const& reason)
{
this->reason = reason;
}
private:
/// The reason for the error.
std::string reason;
};
/**
* Error exception class.
*/
template <typename T>
class error : public error_base
{
public:
/// The enum type providing the error codes for this type.
typedef T error_type;
/// Mapping between error code and error description.
typedef std::map<error_type,const char *> map_type;
/**
* The constructor.
*
* @param error the error message.
*/
error(std::string const& error):
error_base(error)
{
}
/**
* The constructor.
*
* @param error the error message.
* @param reason further information about the error
*/
error(std::string const& error,
std::string const& reason):
error_base(error, reason)
{
}
/// The destructor.
virtual ~error () throw ()
{}
private:
/// Mapping between error code and string.
static map_type error_strings;
/**
* Get a translated error string.
*
* @param error the error code.
* @returns a translated error string.
*/
static const char *
get_error (error_type error);
protected:
/**
* Format an error message.
*
* @param context1 context of the error.
* @param context2 additional context of the error.
* @param context3 additional context of the error.
* @param error the error code.
* @param detail1 details of the error.
* @param detail2 additional details of the error.
* @returns a translated error message.
*
* @todo Merge the logic shared between the two specialisations to
* prevent code duplication.
*/
template <typename A, typename B, typename C, typename D, typename E>
static std::string
format_error (A const& context1,
B const& context2,
C const& context3,
error_type error,
D const& detail1,
E const& detail2);
/**
* Format an error message.
*
* @param context1 context of the error.
* @param context2 additional context of the error.
* @param context3 additional context of the error.
* @param error the error code.
* @param detail1 details of the error.
* @param detail2 additional details of the error.
* @returns a translated error message.
*/
template <typename A, typename B, typename C, typename D, typename E>
static std::string
format_error (A const& context1,
B const& context2,
C const& context3,
std::runtime_error const& error,
D const& detail1,
E const& detail2);
/**
* Format an reason string.
*
* @param context1 context of the error.
* @param context2 additional context of the error.
* @param context3 additional context of the error.
* @param error the error or error code.
* @param detail1 details of the error.
* @param detail2 additional details of the error.
* @returns a translated error message.
*/
template <typename A, typename B, typename C, typename R, typename D, typename E>
static std::string
format_reason (A const& context1,
B const& context2,
C const& context3,
R const& error,
D const& detail1,
E const& detail2);
/**
* Add detail to format string.
*
* @param fmt the format string.
* @param value the value to add.
*/
template<typename A>
static void
add_detail(boost::format& fmt,
A const& value);
/**
* Helper class to add detail to format string.
* Used for non-exception types.
*/
template<typename A, bool b>
struct add_detail_helper
{
/**
* The constructor.
*
* @param fmt the format string to add to.
* @param value the value to add.
*/
add_detail_helper(boost::format& fmt,
A const& value)
{
fmt % value;
}
};
/**
* Helper class to add detail to format string.
* Used for exception types.
*/
template<typename A>
struct add_detail_helper<A, true>
{
/**
* The constructor.
*
* @param fmt the format string to add to.
* @param value the exception to add.
*/
add_detail_helper(boost::format& fmt,
A const& value)
{
fmt % value.what();
}
};
/**
* Add reason to reason string.
*
* @param reason the reason string.
* @param value the value to add.
*/
template<typename A>
static void
add_reason(std::string& reason,
A const& value);
/**
* Helper class to add reason to reason string.
* Used for non-exception types.
*/
template<typename A, bool b>
struct add_reason_helper
{
/**
* The constructor.
*
* @param reason the reason to add to.
* @param value the value to add.
*/
add_reason_helper(std::string& reason,
A const& value)
{
}
};
/**
* Helper class to add reason to reason string.
* Used for exception types.
*/
template<typename A>
struct add_reason_helper<A, true>
{
/**
* The constructor.
*
* @param reason the reason to add to.
* @param value the exception to add.
*/
add_reason_helper(std::string& reason,
A const& value)
{
try
{
sbuild::error_base const& eb(dynamic_cast<sbuild::error_base const&>(value));
if (!reason.empty())
reason += '\n';
reason += eb.why();
}
catch (std::bad_cast const& discard)
{
}
}
};
};
}
#include "sbuild-error.tcc"
#endif /* SBUILD_ERROR_H */
/*
* Local Variables:
* mode:C++
* End:
*/
|
