|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
namespace byrokrat\autogiro\Parser; |
|
6
|
|
|
|
|
7
|
|
|
use byrokrat\autogiro\Exception\InvalidStateException; |
|
8
|
|
|
|
|
9
|
|
|
/** |
|
10
|
|
|
* Handle states and state transitions |
|
11
|
|
|
*/ |
|
12
|
|
|
class StateMachine |
|
13
|
|
|
{ |
|
14
|
|
|
/** |
|
15
|
|
|
* Default init state |
|
16
|
|
|
*/ |
|
17
|
|
|
const STATE_INIT = 'state_init'; |
|
18
|
|
|
|
|
19
|
|
|
/** |
|
20
|
|
|
* Done state |
|
21
|
|
|
*/ |
|
22
|
|
|
const STATE_DONE = 'state_done'; |
|
23
|
|
|
|
|
24
|
|
|
/** |
|
25
|
|
|
* @var string The current state |
|
26
|
|
|
*/ |
|
27
|
|
|
private $currentState; |
|
28
|
|
|
|
|
29
|
|
|
/** |
|
30
|
|
|
* @var array Map of valid transitions |
|
31
|
|
|
*/ |
|
32
|
|
|
private $validTransitions; |
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* Load initial state and define valid transitions |
|
36
|
|
|
* |
|
37
|
|
|
* Transitions are defined in an array of arrays where pre transition states |
|
38
|
|
|
* are keys in the outer array and the values of the inner arrays represent |
|
39
|
|
|
* valid post transitions states. |
|
40
|
|
|
* |
|
41
|
|
|
* @param string $initialState |
|
42
|
|
|
* @param array $validTransitions |
|
43
|
|
|
*/ |
|
44
|
4 |
|
public function __construct(array $validTransitions, string $initialState = self::STATE_INIT) |
|
45
|
|
|
{ |
|
46
|
4 |
|
$this->validTransitions = $validTransitions; |
|
47
|
4 |
|
$this->currentState = $initialState; |
|
48
|
4 |
|
} |
|
49
|
|
|
|
|
50
|
|
|
/** |
|
51
|
|
|
* Set machine in a new state |
|
52
|
|
|
* |
|
53
|
|
|
* @throws InvalidStateException If transition is not valid |
|
54
|
|
|
*/ |
|
55
|
3 |
|
public function transitionTo(string $newState) |
|
56
|
|
|
{ |
|
57
|
3 |
|
if (!array_key_exists($this->currentState, $this->validTransitions)) { |
|
58
|
1 |
|
throw new InvalidStateException("Unexpected transaction code $newState (expecting END)"); |
|
59
|
|
|
} |
|
60
|
|
|
|
|
61
|
2 |
|
if (!in_array($newState, $this->validTransitions[$this->currentState])) { |
|
62
|
1 |
|
throw new InvalidStateException( |
|
63
|
|
|
sprintf( |
|
64
|
1 |
|
'Unexpected transaction code %s (expecting one of [%s])', |
|
65
|
|
|
$newState, |
|
66
|
1 |
|
implode($this->validTransitions[$this->currentState], ', ') |
|
67
|
|
|
) |
|
68
|
|
|
); |
|
69
|
|
|
} |
|
70
|
|
|
|
|
71
|
1 |
|
$this->currentState = $newState; |
|
72
|
1 |
|
} |
|
73
|
|
|
|
|
74
|
|
|
/** |
|
75
|
|
|
* Get current state |
|
76
|
|
|
*/ |
|
77
|
2 |
|
public function getState(): string |
|
78
|
|
|
{ |
|
79
|
2 |
|
return $this->currentState; |
|
80
|
|
|
} |
|
81
|
|
|
} |
|
82
|
|
|
|
byrokrat /
autogiro
