682 lines
27 KiB
PHP
682 lines
27 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\di;
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use ReflectionClass;
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use Yii;
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use yii\base\Component;
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use yii\base\InvalidConfigException;
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use yii\helpers\ArrayHelper;
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/**
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* Container implements a [dependency injection](http://en.wikipedia.org/wiki/Dependency_injection) container.
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*
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* A dependency injection (DI) container is an object that knows how to instantiate and configure objects and
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* all their dependent objects. For more information about DI, please refer to
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* [Martin Fowler's article](http://martinfowler.com/articles/injection.html).
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*
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* Container supports constructor injection as well as property injection.
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*
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* To use Container, you first need to set up the class dependencies by calling [[set()]].
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* You then call [[get()]] to create a new class object. Container will automatically instantiate
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* dependent objects, inject them into the object being created, configure and finally return the newly created object.
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*
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* By default, [[\Yii::$container]] refers to a Container instance which is used by [[\Yii::createObject()]]
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* to create new object instances. You may use this method to replace the `new` operator
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* when creating a new object, which gives you the benefit of automatic dependency resolution and default
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* property configuration.
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*
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* Below is an example of using Container:
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*
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* ```php
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* namespace app\models;
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*
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* use yii\base\BaseObject;
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* use yii\db\Connection;
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* use yii\di\Container;
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*
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* interface UserFinderInterface
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* {
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* function findUser();
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* }
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*
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* class UserFinder extends BaseObject implements UserFinderInterface
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* {
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* public $db;
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*
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* public function __construct(Connection $db, $config = [])
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* {
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* $this->db = $db;
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* parent::__construct($config);
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* }
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*
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* public function findUser()
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* {
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* }
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* }
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*
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* class UserLister extends BaseObject
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* {
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* public $finder;
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*
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* public function __construct(UserFinderInterface $finder, $config = [])
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* {
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* $this->finder = $finder;
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* parent::__construct($config);
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* }
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* }
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*
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* $container = new Container;
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* $container->set('yii\db\Connection', [
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* 'dsn' => '...',
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* ]);
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* $container->set('app\models\UserFinderInterface', [
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* 'class' => 'app\models\UserFinder',
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* ]);
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* $container->set('userLister', 'app\models\UserLister');
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*
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* $lister = $container->get('userLister');
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*
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* // which is equivalent to:
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*
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* $db = new \yii\db\Connection(['dsn' => '...']);
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* $finder = new UserFinder($db);
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* $lister = new UserLister($finder);
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* ```
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*
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* For more details and usage information on Container, see the [guide article on di-containers](guide:concept-di-container).
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*
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* @property array $definitions The list of the object definitions or the loaded shared objects (type or ID =>
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* definition or instance). This property is read-only.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Container extends Component
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{
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/**
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* @var array singleton objects indexed by their types
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*/
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private $_singletons = [];
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/**
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* @var array object definitions indexed by their types
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*/
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private $_definitions = [];
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/**
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* @var array constructor parameters indexed by object types
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*/
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private $_params = [];
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/**
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* @var array cached ReflectionClass objects indexed by class/interface names
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*/
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private $_reflections = [];
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/**
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* @var array cached dependencies indexed by class/interface names. Each class name
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* is associated with a list of constructor parameter types or default values.
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*/
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private $_dependencies = [];
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/**
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* Returns an instance of the requested class.
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*
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* You may provide constructor parameters (`$params`) and object configurations (`$config`)
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* that will be used during the creation of the instance.
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*
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* If the class implements [[\yii\base\Configurable]], the `$config` parameter will be passed as the last
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* parameter to the class constructor; Otherwise, the configuration will be applied *after* the object is
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* instantiated.
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*
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* Note that if the class is declared to be singleton by calling [[setSingleton()]],
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* the same instance of the class will be returned each time this method is called.
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* In this case, the constructor parameters and object configurations will be used
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* only if the class is instantiated the first time.
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*
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* @param string|Instance $class the class Instance, name or an alias name (e.g. `foo`) that was previously registered via [[set()]]
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* or [[setSingleton()]].
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* @param array $params a list of constructor parameter values. The parameters should be provided in the order
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* they appear in the constructor declaration. If you want to skip some parameters, you should index the remaining
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* ones with the integers that represent their positions in the constructor parameter list.
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* @param array $config a list of name-value pairs that will be used to initialize the object properties.
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* @return object an instance of the requested class.
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* @throws InvalidConfigException if the class cannot be recognized or correspond to an invalid definition
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* @throws NotInstantiableException If resolved to an abstract class or an interface (since 2.0.9)
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*/
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public function get($class, $params = [], $config = [])
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{
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if ($class instanceof Instance) {
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$class = $class->id;
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}
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if (isset($this->_singletons[$class])) {
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// singleton
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return $this->_singletons[$class];
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} elseif (!isset($this->_definitions[$class])) {
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return $this->build($class, $params, $config);
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}
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$definition = $this->_definitions[$class];
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if (is_callable($definition, true)) {
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$params = $this->resolveDependencies($this->mergeParams($class, $params));
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$object = call_user_func($definition, $this, $params, $config);
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} elseif (is_array($definition)) {
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$concrete = $definition['class'];
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unset($definition['class']);
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$config = array_merge($definition, $config);
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$params = $this->mergeParams($class, $params);
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if ($concrete === $class) {
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$object = $this->build($class, $params, $config);
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} else {
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$object = $this->get($concrete, $params, $config);
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}
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} elseif (is_object($definition)) {
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return $this->_singletons[$class] = $definition;
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} else {
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throw new InvalidConfigException('Unexpected object definition type: ' . gettype($definition));
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}
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if (array_key_exists($class, $this->_singletons)) {
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// singleton
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$this->_singletons[$class] = $object;
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}
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return $object;
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}
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/**
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* Registers a class definition with this container.
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*
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* For example,
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*
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* ```php
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* // register a class name as is. This can be skipped.
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* $container->set('yii\db\Connection');
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*
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* // register an interface
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* // When a class depends on the interface, the corresponding class
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* // will be instantiated as the dependent object
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* $container->set('yii\mail\MailInterface', 'yii\swiftmailer\Mailer');
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*
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* // register an alias name. You can use $container->get('foo')
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* // to create an instance of Connection
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* $container->set('foo', 'yii\db\Connection');
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*
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* // register a class with configuration. The configuration
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* // will be applied when the class is instantiated by get()
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* $container->set('yii\db\Connection', [
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* 'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
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* 'username' => 'root',
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* 'password' => '',
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* 'charset' => 'utf8',
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* ]);
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*
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* // register an alias name with class configuration
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* // In this case, a "class" element is required to specify the class
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* $container->set('db', [
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* 'class' => 'yii\db\Connection',
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* 'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
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* 'username' => 'root',
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* 'password' => '',
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* 'charset' => 'utf8',
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* ]);
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*
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* // register a PHP callable
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* // The callable will be executed when $container->get('db') is called
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* $container->set('db', function ($container, $params, $config) {
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* return new \yii\db\Connection($config);
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* });
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* ```
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*
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* If a class definition with the same name already exists, it will be overwritten with the new one.
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* You may use [[has()]] to check if a class definition already exists.
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*
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* @param string $class class name, interface name or alias name
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* @param mixed $definition the definition associated with `$class`. It can be one of the following:
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*
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* - a PHP callable: The callable will be executed when [[get()]] is invoked. The signature of the callable
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* should be `function ($container, $params, $config)`, where `$params` stands for the list of constructor
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* parameters, `$config` the object configuration, and `$container` the container object. The return value
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* of the callable will be returned by [[get()]] as the object instance requested.
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* - a configuration array: the array contains name-value pairs that will be used to initialize the property
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* values of the newly created object when [[get()]] is called. The `class` element stands for the
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* the class of the object to be created. If `class` is not specified, `$class` will be used as the class name.
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* - a string: a class name, an interface name or an alias name.
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* @param array $params the list of constructor parameters. The parameters will be passed to the class
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* constructor when [[get()]] is called.
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* @return $this the container itself
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*/
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public function set($class, $definition = [], array $params = [])
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{
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$this->_definitions[$class] = $this->normalizeDefinition($class, $definition);
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$this->_params[$class] = $params;
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unset($this->_singletons[$class]);
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return $this;
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}
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/**
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* Registers a class definition with this container and marks the class as a singleton class.
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*
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* This method is similar to [[set()]] except that classes registered via this method will only have one
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* instance. Each time [[get()]] is called, the same instance of the specified class will be returned.
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*
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* @param string $class class name, interface name or alias name
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* @param mixed $definition the definition associated with `$class`. See [[set()]] for more details.
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* @param array $params the list of constructor parameters. The parameters will be passed to the class
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* constructor when [[get()]] is called.
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* @return $this the container itself
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* @see set()
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*/
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public function setSingleton($class, $definition = [], array $params = [])
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{
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$this->_definitions[$class] = $this->normalizeDefinition($class, $definition);
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$this->_params[$class] = $params;
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$this->_singletons[$class] = null;
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return $this;
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}
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/**
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* Returns a value indicating whether the container has the definition of the specified name.
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* @param string $class class name, interface name or alias name
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* @return bool whether the container has the definition of the specified name..
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* @see set()
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*/
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public function has($class)
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{
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return isset($this->_definitions[$class]);
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}
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/**
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* Returns a value indicating whether the given name corresponds to a registered singleton.
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* @param string $class class name, interface name or alias name
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* @param bool $checkInstance whether to check if the singleton has been instantiated.
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* @return bool whether the given name corresponds to a registered singleton. If `$checkInstance` is true,
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* the method should return a value indicating whether the singleton has been instantiated.
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*/
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public function hasSingleton($class, $checkInstance = false)
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{
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return $checkInstance ? isset($this->_singletons[$class]) : array_key_exists($class, $this->_singletons);
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}
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/**
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* Removes the definition for the specified name.
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* @param string $class class name, interface name or alias name
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*/
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public function clear($class)
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{
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unset($this->_definitions[$class], $this->_singletons[$class]);
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}
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/**
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* Normalizes the class definition.
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* @param string $class class name
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* @param string|array|callable $definition the class definition
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* @return array the normalized class definition
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* @throws InvalidConfigException if the definition is invalid.
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*/
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protected function normalizeDefinition($class, $definition)
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{
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if (empty($definition)) {
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return ['class' => $class];
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} elseif (is_string($definition)) {
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return ['class' => $definition];
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} elseif ($definition instanceof Instance) {
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return ['class' => $definition->id];
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} elseif (is_callable($definition, true) || is_object($definition)) {
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return $definition;
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} elseif (is_array($definition)) {
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if (!isset($definition['class']) && isset($definition['__class'])) {
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$definition['class'] = $definition['__class'];
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unset($definition['__class']);
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}
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if (!isset($definition['class'])) {
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if (strpos($class, '\\') !== false) {
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$definition['class'] = $class;
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} else {
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throw new InvalidConfigException('A class definition requires a "class" member.');
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}
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}
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return $definition;
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}
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throw new InvalidConfigException("Unsupported definition type for \"$class\": " . gettype($definition));
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}
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/**
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* Returns the list of the object definitions or the loaded shared objects.
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* @return array the list of the object definitions or the loaded shared objects (type or ID => definition or instance).
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*/
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public function getDefinitions()
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{
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return $this->_definitions;
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}
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/**
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* Creates an instance of the specified class.
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* This method will resolve dependencies of the specified class, instantiate them, and inject
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* them into the new instance of the specified class.
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* @param string $class the class name
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* @param array $params constructor parameters
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* @param array $config configurations to be applied to the new instance
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* @return object the newly created instance of the specified class
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* @throws NotInstantiableException If resolved to an abstract class or an interface (since 2.0.9)
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*/
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protected function build($class, $params, $config)
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{
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/* @var $reflection ReflectionClass */
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list($reflection, $dependencies) = $this->getDependencies($class);
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if (isset($config['__construct()'])) {
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foreach ($config['__construct()'] as $index => $param) {
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$dependencies[$index] = $param;
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}
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unset($config['__construct()']);
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}
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foreach ($params as $index => $param) {
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$dependencies[$index] = $param;
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}
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$dependencies = $this->resolveDependencies($dependencies, $reflection);
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if (!$reflection->isInstantiable()) {
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throw new NotInstantiableException($reflection->name);
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}
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if (empty($config)) {
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return $reflection->newInstanceArgs($dependencies);
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}
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$config = $this->resolveDependencies($config);
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if (!empty($dependencies) && $reflection->implementsInterface('yii\base\Configurable')) {
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// set $config as the last parameter (existing one will be overwritten)
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$dependencies[count($dependencies) - 1] = $config;
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return $reflection->newInstanceArgs($dependencies);
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}
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$object = $reflection->newInstanceArgs($dependencies);
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foreach ($config as $name => $value) {
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$object->$name = $value;
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}
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return $object;
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}
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/**
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* Merges the user-specified constructor parameters with the ones registered via [[set()]].
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* @param string $class class name, interface name or alias name
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* @param array $params the constructor parameters
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* @return array the merged parameters
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*/
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protected function mergeParams($class, $params)
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{
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if (empty($this->_params[$class])) {
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return $params;
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} elseif (empty($params)) {
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return $this->_params[$class];
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}
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$ps = $this->_params[$class];
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foreach ($params as $index => $value) {
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$ps[$index] = $value;
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}
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return $ps;
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}
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/**
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* Returns the dependencies of the specified class.
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* @param string $class class name, interface name or alias name
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* @return array the dependencies of the specified class.
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* @throws InvalidConfigException if a dependency cannot be resolved or if a dependency cannot be fulfilled.
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*/
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protected function getDependencies($class)
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{
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if (isset($this->_reflections[$class])) {
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return [$this->_reflections[$class], $this->_dependencies[$class]];
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}
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$dependencies = [];
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try {
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$reflection = new ReflectionClass($class);
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} catch (\ReflectionException $e) {
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throw new InvalidConfigException('Failed to instantiate component or class "' . $class . '".', 0, $e);
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}
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$constructor = $reflection->getConstructor();
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if ($constructor !== null) {
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foreach ($constructor->getParameters() as $param) {
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if (version_compare(PHP_VERSION, '5.6.0', '>=') && $param->isVariadic()) {
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break;
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} elseif ($param->isDefaultValueAvailable()) {
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$dependencies[] = $param->getDefaultValue();
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} else {
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$c = $param->getClass();
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$dependencies[] = Instance::of($c === null ? null : $c->getName());
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}
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}
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}
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$this->_reflections[$class] = $reflection;
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$this->_dependencies[$class] = $dependencies;
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return [$reflection, $dependencies];
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}
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/**
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* Resolves dependencies by replacing them with the actual object instances.
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* @param array $dependencies the dependencies
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* @param ReflectionClass $reflection the class reflection associated with the dependencies
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* @return array the resolved dependencies
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* @throws InvalidConfigException if a dependency cannot be resolved or if a dependency cannot be fulfilled.
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*/
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protected function resolveDependencies($dependencies, $reflection = null)
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{
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foreach ($dependencies as $index => $dependency) {
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if ($dependency instanceof Instance) {
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if ($dependency->id !== null) {
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$dependencies[$index] = $this->get($dependency->id);
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} elseif ($reflection !== null) {
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$name = $reflection->getConstructor()->getParameters()[$index]->getName();
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$class = $reflection->getName();
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throw new InvalidConfigException("Missing required parameter \"$name\" when instantiating \"$class\".");
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}
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} elseif (is_array($dependency)) {
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$dependencies[$index] = $this->resolveDependencies($dependency, $reflection);
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}
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}
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return $dependencies;
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}
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/**
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* Invoke a callback with resolving dependencies in parameters.
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*
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* This methods allows invoking a callback and let type hinted parameter names to be
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* resolved as objects of the Container. It additionally allow calling function using named parameters.
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*
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* For example, the following callback may be invoked using the Container to resolve the formatter dependency:
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*
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|
* ```php
|
|
* $formatString = function($string, \yii\i18n\Formatter $formatter) {
|
|
* // ...
|
|
* }
|
|
* Yii::$container->invoke($formatString, ['string' => 'Hello World!']);
|
|
* ```
|
|
*
|
|
* This will pass the string `'Hello World!'` as the first param, and a formatter instance created
|
|
* by the DI container as the second param to the callable.
|
|
*
|
|
* @param callable $callback callable to be invoked.
|
|
* @param array $params The array of parameters for the function.
|
|
* This can be either a list of parameters, or an associative array representing named function parameters.
|
|
* @return mixed the callback return value.
|
|
* @throws InvalidConfigException if a dependency cannot be resolved or if a dependency cannot be fulfilled.
|
|
* @throws NotInstantiableException If resolved to an abstract class or an interface (since 2.0.9)
|
|
* @since 2.0.7
|
|
*/
|
|
public function invoke(callable $callback, $params = [])
|
|
{
|
|
return call_user_func_array($callback, $this->resolveCallableDependencies($callback, $params));
|
|
}
|
|
|
|
/**
|
|
* Resolve dependencies for a function.
|
|
*
|
|
* This method can be used to implement similar functionality as provided by [[invoke()]] in other
|
|
* components.
|
|
*
|
|
* @param callable $callback callable to be invoked.
|
|
* @param array $params The array of parameters for the function, can be either numeric or associative.
|
|
* @return array The resolved dependencies.
|
|
* @throws InvalidConfigException if a dependency cannot be resolved or if a dependency cannot be fulfilled.
|
|
* @throws NotInstantiableException If resolved to an abstract class or an interface (since 2.0.9)
|
|
* @since 2.0.7
|
|
*/
|
|
public function resolveCallableDependencies(callable $callback, $params = [])
|
|
{
|
|
if (is_array($callback)) {
|
|
$reflection = new \ReflectionMethod($callback[0], $callback[1]);
|
|
} elseif (is_object($callback) && !$callback instanceof \Closure) {
|
|
$reflection = new \ReflectionMethod($callback, '__invoke');
|
|
} else {
|
|
$reflection = new \ReflectionFunction($callback);
|
|
}
|
|
|
|
$args = [];
|
|
|
|
$associative = ArrayHelper::isAssociative($params);
|
|
|
|
foreach ($reflection->getParameters() as $param) {
|
|
$name = $param->getName();
|
|
if (($class = $param->getClass()) !== null) {
|
|
$className = $class->getName();
|
|
if (version_compare(PHP_VERSION, '5.6.0', '>=') && $param->isVariadic()) {
|
|
$args = array_merge($args, array_values($params));
|
|
break;
|
|
} elseif ($associative && isset($params[$name]) && $params[$name] instanceof $className) {
|
|
$args[] = $params[$name];
|
|
unset($params[$name]);
|
|
} elseif (!$associative && isset($params[0]) && $params[0] instanceof $className) {
|
|
$args[] = array_shift($params);
|
|
} elseif (isset(Yii::$app) && Yii::$app->has($name) && ($obj = Yii::$app->get($name)) instanceof $className) {
|
|
$args[] = $obj;
|
|
} else {
|
|
// If the argument is optional we catch not instantiable exceptions
|
|
try {
|
|
$args[] = $this->get($className);
|
|
} catch (NotInstantiableException $e) {
|
|
if ($param->isDefaultValueAvailable()) {
|
|
$args[] = $param->getDefaultValue();
|
|
} else {
|
|
throw $e;
|
|
}
|
|
}
|
|
}
|
|
} elseif ($associative && isset($params[$name])) {
|
|
$args[] = $params[$name];
|
|
unset($params[$name]);
|
|
} elseif (!$associative && count($params)) {
|
|
$args[] = array_shift($params);
|
|
} elseif ($param->isDefaultValueAvailable()) {
|
|
$args[] = $param->getDefaultValue();
|
|
} elseif (!$param->isOptional()) {
|
|
$funcName = $reflection->getName();
|
|
throw new InvalidConfigException("Missing required parameter \"$name\" when calling \"$funcName\".");
|
|
}
|
|
}
|
|
|
|
foreach ($params as $value) {
|
|
$args[] = $value;
|
|
}
|
|
|
|
return $args;
|
|
}
|
|
|
|
/**
|
|
* Registers class definitions within this container.
|
|
*
|
|
* @param array $definitions array of definitions. There are two allowed formats of array.
|
|
* The first format:
|
|
* - key: class name, interface name or alias name. The key will be passed to the [[set()]] method
|
|
* as a first argument `$class`.
|
|
* - value: the definition associated with `$class`. Possible values are described in
|
|
* [[set()]] documentation for the `$definition` parameter. Will be passed to the [[set()]] method
|
|
* as the second argument `$definition`.
|
|
*
|
|
* Example:
|
|
* ```php
|
|
* $container->setDefinitions([
|
|
* 'yii\web\Request' => 'app\components\Request',
|
|
* 'yii\web\Response' => [
|
|
* 'class' => 'app\components\Response',
|
|
* 'format' => 'json'
|
|
* ],
|
|
* 'foo\Bar' => function () {
|
|
* $qux = new Qux;
|
|
* $foo = new Foo($qux);
|
|
* return new Bar($foo);
|
|
* }
|
|
* ]);
|
|
* ```
|
|
*
|
|
* The second format:
|
|
* - key: class name, interface name or alias name. The key will be passed to the [[set()]] method
|
|
* as a first argument `$class`.
|
|
* - value: array of two elements. The first element will be passed the [[set()]] method as the
|
|
* second argument `$definition`, the second one — as `$params`.
|
|
*
|
|
* Example:
|
|
* ```php
|
|
* $container->setDefinitions([
|
|
* 'foo\Bar' => [
|
|
* ['class' => 'app\Bar'],
|
|
* [Instance::of('baz')]
|
|
* ]
|
|
* ]);
|
|
* ```
|
|
*
|
|
* @see set() to know more about possible values of definitions
|
|
* @since 2.0.11
|
|
*/
|
|
public function setDefinitions(array $definitions)
|
|
{
|
|
foreach ($definitions as $class => $definition) {
|
|
if (is_array($definition) && count($definition) === 2 && array_values($definition) === $definition && is_array($definition[1])) {
|
|
$this->set($class, $definition[0], $definition[1]);
|
|
continue;
|
|
}
|
|
|
|
$this->set($class, $definition);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Registers class definitions as singletons within this container by calling [[setSingleton()]].
|
|
*
|
|
* @param array $singletons array of singleton definitions. See [[setDefinitions()]]
|
|
* for allowed formats of array.
|
|
*
|
|
* @see setDefinitions() for allowed formats of $singletons parameter
|
|
* @see setSingleton() to know more about possible values of definitions
|
|
* @since 2.0.11
|
|
*/
|
|
public function setSingletons(array $singletons)
|
|
{
|
|
foreach ($singletons as $class => $definition) {
|
|
if (is_array($definition) && count($definition) === 2 && array_values($definition) === $definition) {
|
|
$this->setSingleton($class, $definition[0], $definition[1]);
|
|
continue;
|
|
}
|
|
|
|
$this->setSingleton($class, $definition);
|
|
}
|
|
}
|
|
}
|