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2 |
1 | <?php |
2 | |
3 | declare(strict_types=1); |
4 | |
5 | /** |
6 | * This file is part of php-fast-forward/config. |
7 | * |
8 | * This source file is subject to the license bundled |
9 | * with this source code in the file LICENSE. |
10 | * |
11 | * @link https://github.com/php-fast-forward/config |
12 | * @copyright Copyright (c) 2025 Felipe Sayão Lobato Abreu <github@mentordosnerds.com> |
13 | * @license https://opensource.org/licenses/MIT MIT License |
14 | */ |
15 | |
16 | namespace FastForward\Config; |
17 | |
18 | /** |
19 | * Trait LazyLoadConfigTrait. |
20 | * |
21 | * Implements lazy-loading behavior for configuration access. |
22 | * This trait MUST be used in classes implementing ConfigInterface to defer configuration instantiation |
23 | * until first usage. It SHALL invoke the implementing class as a callable to obtain the actual config instance. |
24 | */ |
25 | trait LazyLoadConfigTrait |
26 | { |
27 | use ArrayAccessConfigTrait; |
28 | |
29 | /** |
30 | * @var null|ConfigInterface holds the loaded configuration instance |
31 | */ |
32 | private ?ConfigInterface $config = null; |
33 | |
34 | /** |
35 | * Implementing class MUST define the __invoke() method to return a ConfigInterface instance. |
36 | * |
37 | * @return ConfigInterface the actual configuration instance |
38 | */ |
39 | abstract public function __invoke(): ConfigInterface; |
40 | |
41 | /** |
42 | * Retrieves a configuration value by key. |
43 | * |
44 | * @param string $key the configuration key to retrieve |
45 | * @param null|mixed $default the default value if the key is not found |
46 | * |
47 | * @return mixed the value of the configuration key or the default |
48 | */ |
49 | public function get(string $key, mixed $default = null): mixed |
50 | { |
51 | return $this->getConfig()->get($key, $default); |
52 | } |
53 | |
54 | /** |
55 | * Checks for existence of a configuration key. |
56 | * |
57 | * @param string $key the configuration key to check |
58 | * |
59 | * @return bool TRUE if the key exists, FALSE otherwise |
60 | */ |
61 | public function has(string $key): bool |
62 | { |
63 | return $this->getConfig()->has($key); |
64 | } |
65 | |
66 | /** |
67 | * Sets configuration data. |
68 | * |
69 | * @param array|ConfigInterface|string $key the key or set of keys/values to set |
70 | * @param null|mixed $value the value to set if a single key is provided |
71 | */ |
72 | public function set(array|ConfigInterface|string $key, mixed $value = null): void |
73 | { |
74 | $this->getConfig()->set($key, $value); |
75 | } |
76 | |
77 | /** |
78 | * Removes a configuration key. |
79 | * |
80 | * @param string $key the configuration key to remove |
81 | */ |
82 | public function remove(string $key): void |
83 | { |
84 | $this->getConfig()->remove($key); |
85 | } |
86 | |
87 | /** |
88 | * Exports the entire configuration to an array. |
89 | * |
90 | * @return array the configuration as an associative array |
91 | */ |
92 | public function toArray(): array |
93 | { |
94 | return $this->getConfig()->toArray(); |
95 | } |
96 | |
97 | /** |
98 | * Retrieves an iterator for traversing the configuration data. |
99 | * |
100 | * @return \Traversable an iterator over the configuration |
101 | */ |
102 | public function getIterator(): \Traversable |
103 | { |
104 | return $this->getConfig()->getIterator(); |
105 | } |
106 | |
107 | /** |
108 | * Retrieves or initializes the configuration instance. |
109 | * |
110 | * @return ConfigInterface the lazily-loaded configuration object |
111 | */ |
112 | private function getConfig(): ConfigInterface |
113 | { |
114 | if ($this->config) { |
115 | return $this->config; |
116 | } |
117 | |
118 | $this->config = \call_user_func($this); |
119 | |
120 | return $this->config; |
121 | } |
122 | } |