blob: a1d32402b87f56eeaf6bb65dc35a73d9b5a8cb0d (
plain)
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
|
/*
* Copyright 2022 Frederico de Oliveira Linhares
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include "command.hpp"
CommandError::CommandError(const std::string &m):
error(m)
{
}
CommandError::CommandError(const char &m):
CommandError{std::string{m}}
{
}
const char* CommandError::what() const noexcept
{
return this->error.c_str();
}
CommandChain::CommandChain(std::initializer_list<Command> commands)
{
for(auto c: commands) this->add(c);
}
void
CommandChain::partial_revert(void *obj, int32_t step) const
{
// Already unloaded, nothing to do.
if(step <= 0) return;
for(; step > 0; step--)
{
auto command = this->_commands[step -1].undo_command;
if(command != nullptr) command(obj);
}
}
void
CommandChain::add(const Command &c)
{
this->_commands.push_back(c);
}
void
CommandChain::execute(void *obj) const
{
for(auto i{0}; i < this->_commands.size(); i++)
{
try { this->_commands[i].do_command(obj); }
catch(const CommandError &error)
{
this->partial_revert(obj, i);
throw;
}
}
}
void
CommandChain::revert(void *obj) const
{
this->partial_revert(obj, this->_commands.size());
}
|
