|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* @link http://www.yiiframework.com/ |
|
4
|
|
|
* @copyright Copyright (c) 2008 Yii Software LLC |
|
5
|
|
|
* @license http://www.yiiframework.com/license/ |
|
6
|
|
|
*/ |
|
7
|
|
|
|
|
8
|
|
|
namespace yii\di; |
|
9
|
|
|
|
|
10
|
|
|
use Yii; |
|
11
|
|
|
use yii\base\InvalidConfigException; |
|
12
|
|
|
|
|
13
|
|
|
/** |
|
14
|
|
|
* Instance represents a reference to a named object in a dependency injection (DI) container or a service locator. |
|
15
|
|
|
* |
|
16
|
|
|
* You may use [[get()]] to obtain the actual object referenced by [[id]]. |
|
17
|
|
|
* |
|
18
|
|
|
* Instance is mainly used in two places: |
|
19
|
|
|
* |
|
20
|
|
|
* - When configuring a dependency injection container, you use Instance to reference a class name, interface name |
|
21
|
|
|
* or alias name. The reference can later be resolved into the actual object by the container. |
|
22
|
|
|
* - In classes which use service locator to obtain dependent objects. |
|
23
|
|
|
* |
|
24
|
|
|
* The following example shows how to configure a DI container with Instance: |
|
25
|
|
|
* |
|
26
|
|
|
* ```php |
|
27
|
|
|
* $container = new \yii\di\Container; |
|
28
|
|
|
* $container->set('cache', [ |
|
29
|
|
|
* 'class' => \yii\caching\DbCache::class, |
|
30
|
|
|
* 'db' => Instance::of('db') |
|
31
|
|
|
* ]); |
|
32
|
|
|
* $container->set('db', [ |
|
33
|
|
|
* 'class' => \yii\db\Connection::class, |
|
34
|
|
|
* 'dsn' => 'sqlite:path/to/file.db', |
|
35
|
|
|
* ]); |
|
36
|
|
|
* ``` |
|
37
|
|
|
* |
|
38
|
|
|
* And the following example shows how a class retrieves a component from a service locator: |
|
39
|
|
|
* |
|
40
|
|
|
* ```php |
|
41
|
|
|
* class DbCache extends Cache |
|
42
|
|
|
* { |
|
43
|
|
|
* public $db = 'db'; |
|
44
|
|
|
* |
|
45
|
|
|
* public function init() |
|
46
|
|
|
* { |
|
47
|
|
|
* parent::init(); |
|
48
|
|
|
* $this->db = Instance::ensure($this->db, \yii\db\Connection::class); |
|
49
|
|
|
* } |
|
50
|
|
|
* } |
|
51
|
|
|
* ``` |
|
52
|
|
|
* |
|
53
|
|
|
* @author Qiang Xue <[email protected]> |
|
54
|
|
|
* @since 2.0 |
|
55
|
|
|
*/ |
|
56
|
|
|
class Instance |
|
57
|
|
|
{ |
|
58
|
|
|
/** |
|
59
|
|
|
* @var string the component ID, class name, interface name or alias name |
|
60
|
|
|
*/ |
|
61
|
|
|
public $id; |
|
62
|
|
|
|
|
63
|
|
|
|
|
64
|
|
|
/** |
|
65
|
|
|
* Constructor. |
|
66
|
|
|
* @param string $id the component ID |
|
67
|
|
|
*/ |
|
68
|
75 |
|
protected function __construct($id) |
|
69
|
|
|
{ |
|
70
|
75 |
|
$this->id = $id; |
|
71
|
75 |
|
} |
|
72
|
|
|
|
|
73
|
|
|
/** |
|
74
|
|
|
* Creates a new Instance object. |
|
75
|
|
|
* @param string $id the component ID |
|
76
|
|
|
* @return Instance the new Instance object. |
|
77
|
|
|
*/ |
|
78
|
21 |
|
public static function of($id) |
|
79
|
|
|
{ |
|
80
|
21 |
|
return new static($id); |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
|
|
/** |
|
84
|
|
|
* Resolves the specified reference into the actual object and makes sure it is of the specified type. |
|
85
|
|
|
* |
|
86
|
|
|
* The reference may be specified as a string or an Instance object. If the former, |
|
87
|
|
|
* it will be treated as a component ID, a class/interface name or an alias, depending on the container type. |
|
88
|
|
|
* |
|
89
|
|
|
* If you do not specify a container, the method will first try `Yii::$app` followed by `Yii::$container`. |
|
90
|
|
|
* |
|
91
|
|
|
* For example, |
|
92
|
|
|
* |
|
93
|
|
|
* ```php |
|
94
|
|
|
* use yii\db\Connection; |
|
95
|
|
|
* |
|
96
|
|
|
* // returns Yii::$app->db |
|
97
|
|
|
* $db = Instance::ensure('db', Connection::class); |
|
98
|
|
|
* // returns an instance of Connection using the given configuration |
|
99
|
|
|
* $db = Instance::ensure(['dsn' => 'sqlite:path/to/my.db'], Connection::class); |
|
100
|
|
|
* ``` |
|
101
|
|
|
* |
|
102
|
|
|
* @param object|string|array|static $reference an object or a reference to the desired object. |
|
103
|
|
|
* You may specify a reference in terms of a component ID or an Instance object. |
|
104
|
|
|
* Starting from version 2.0.2, you may also pass in a configuration array for creating the object. |
|
105
|
|
|
* If the "class" value is not specified in the configuration array, it will use the value of `$type`. |
|
106
|
|
|
* @param string $type the class/interface name to be checked. If null, type check will not be performed. |
|
107
|
|
|
* @param ServiceLocator|Container $container the container. This will be passed to [[get()]]. |
|
108
|
|
|
* @return object the object referenced by the Instance, or `$reference` itself if it is an object. |
|
109
|
|
|
* @throws InvalidConfigException if the reference is invalid |
|
110
|
|
|
*/ |
|
111
|
242 |
|
public static function ensure($reference, $type = null, $container = null) |
|
112
|
|
|
{ |
|
113
|
242 |
|
if (is_array($reference)) { |
|
114
|
4 |
|
$class = isset($reference['class']) ? $reference['class'] : $type; |
|
115
|
4 |
|
if (!$container instanceof Container) { |
|
116
|
2 |
|
$container = Yii::$container; |
|
117
|
|
|
} |
|
118
|
4 |
|
unset($reference['class']); |
|
119
|
4 |
|
$component = $container->get($class, [], $reference); |
|
120
|
4 |
|
if ($type === null || $component instanceof $type) { |
|
121
|
3 |
|
return $component; |
|
122
|
|
|
} |
|
123
|
|
|
|
|
124
|
1 |
|
throw new InvalidConfigException('Invalid data type: ' . $class . '. ' . $type . ' is expected.'); |
|
125
|
|
|
} elseif (empty($reference)) { |
|
126
|
1 |
|
throw new InvalidConfigException('The required component is not specified.'); |
|
127
|
|
|
} |
|
128
|
|
|
|
|
129
|
240 |
|
if (is_string($reference)) { |
|
130
|
54 |
|
$reference = new static($reference); |
|
131
|
213 |
|
} elseif ($type === null || $reference instanceof $type) { |
|
132
|
210 |
|
return $reference; |
|
133
|
|
|
} |
|
134
|
|
|
|
|
135
|
57 |
|
if ($reference instanceof self) { |
|
136
|
|
|
try { |
|
137
|
56 |
|
$component = $reference->get($container); |
|
138
|
3 |
|
} catch (\ReflectionException $e) { |
|
139
|
3 |
|
throw new InvalidConfigException('Failed to instantiate component or class "' . $reference->id . '".', 0, $e); |
|
140
|
|
|
} |
|
141
|
53 |
|
if ($type === null || $component instanceof $type) { |
|
142
|
52 |
|
return $component; |
|
143
|
|
|
} |
|
144
|
|
|
|
|
145
|
1 |
|
throw new InvalidConfigException('"' . $reference->id . '" refers to a ' . get_class($component) . " component. $type is expected."); |
|
146
|
|
|
} |
|
147
|
|
|
|
|
148
|
1 |
|
$valueType = is_object($reference) ? get_class($reference) : gettype($reference); |
|
149
|
1 |
|
throw new InvalidConfigException("Invalid data type: $valueType. $type is expected."); |
|
150
|
|
|
} |
|
151
|
|
|
|
|
152
|
|
|
/** |
|
153
|
|
|
* Returns the actual object referenced by this Instance object. |
|
154
|
|
|
* @param ServiceLocator|Container $container the container used to locate the referenced object. |
|
155
|
|
|
* If null, the method will first try `Yii::$app` then `Yii::$container`. |
|
156
|
|
|
* @return object the actual object referenced by this Instance object. |
|
157
|
|
|
*/ |
|
158
|
57 |
|
public function get($container = null) |
|
159
|
|
|
{ |
|
160
|
57 |
|
if ($container) { |
|
161
|
6 |
|
return $container->get($this->id); |
|
162
|
|
|
} |
|
163
|
51 |
|
if (Yii::$app && Yii::$app->has($this->id)) { |
|
164
|
47 |
|
return Yii::$app->get($this->id); |
|
165
|
|
|
} |
|
166
|
|
|
|
|
167
|
4 |
|
return Yii::$container->get($this->id); |
|
168
|
|
|
} |
|
169
|
|
|
|
|
170
|
|
|
/** |
|
171
|
|
|
* Restores class state after using `var_export()` |
|
172
|
|
|
* |
|
173
|
|
|
* @param array $state |
|
174
|
|
|
* @return Instance |
|
175
|
|
|
* @throws InvalidConfigException when $state property does not contain `id` parameter |
|
176
|
|
|
* @see var_export() |
|
177
|
|
|
* @since 2.0.12 |
|
178
|
|
|
*/ |
|
179
|
2 |
|
public static function __set_state($state) |
|
180
|
|
|
{ |
|
181
|
2 |
|
if (!isset($state['id'])) { |
|
182
|
1 |
|
throw new InvalidConfigException('Failed to instantiate class "Instance". Required parameter "id" is missing'); |
|
183
|
|
|
} |
|
184
|
|
|
|
|
185
|
1 |
|
return new self($state['id']); |
|
186
|
|
|
} |
|
187
|
|
|
} |
|
188
|
|
|
|
yiisoft /
yii2
