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1 | <?php |
2 | ||
3 | /* | |
4 | * This file is part of the Symfony package. | |
5 | * | |
6 | * (c) Fabien Potencier <fabien@symfony.com> | |
7 | * | |
8 | * For the full copyright and license information, please view the LICENSE | |
9 | * file that was distributed with this source code. | |
10 | */ | |
11 | ||
12 | namespace Symfony\Component\Form\Extension\Core\DataTransformer; | |
13 | ||
14 | use Symfony\Component\Form\DataTransformerInterface; | |
15 | use Symfony\Component\Form\Exception\TransformationFailedException; | |
16 | ||
17 | /** | |
18 | * Transforms between a Boolean and a string. | |
19 | * | |
20 | * @author Bernhard Schussek <bschussek@gmail.com> | |
21 | * @author Florian Eckerstorfer <florian@eckerstorfer.org> | |
22 | */ | |
23 | class BooleanToStringTransformer implements DataTransformerInterface | |
24 | { | |
25 | /** | |
26 | * The value emitted upon transform if the input is true | |
27 | * @var string | |
28 | */ | |
29 | private $trueValue; | |
30 | ||
31 | /** | |
32 | * Sets the value emitted upon transform if the input is true. | |
33 | * | |
34 | * @param string $trueValue | |
35 | */ | |
36 | public function __construct($trueValue) | |
37 | { | |
38 | $this->trueValue = $trueValue; | |
39 | } | |
40 | ||
41 | /** | |
42 | * Transforms a Boolean into a string. | |
43 | * | |
44 | * @param Boolean $value Boolean value. | |
45 | * | |
46 | * @return string String value. | |
47 | * | |
48 | * @throws TransformationFailedException If the given value is not a Boolean. | |
49 | */ | |
50 | public function transform($value) | |
51 | { | |
52 | if (null === $value) { | |
53 | return null; | |
54 | } | |
55 | ||
56 | if (!is_bool($value)) { | |
57 | throw new TransformationFailedException('Expected a Boolean.'); | |
58 | } | |
59 | ||
60 | return true === $value ? $this->trueValue : null; | |
61 | } | |
62 | ||
63 | /** | |
64 | * Transforms a string into a Boolean. | |
65 | * | |
66 | * @param string $value String value. | |
67 | * | |
68 | * @return Boolean Boolean value. | |
69 | * | |
70 | * @throws TransformationFailedException If the given value is not a string. | |
71 | */ | |
72 | public function reverseTransform($value) | |
73 | { | |
74 | if (null === $value) { | |
75 | return false; | |
76 | } | |
77 | ||
78 | if (!is_string($value)) { | |
79 | throw new TransformationFailedException('Expected a string.'); | |
80 | } | |
81 | ||
82 | return true; | |
83 | } | |
84 | ||
85 | } |