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Instance.php000066600000012740151456237140007041 0ustar00<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\di;

use Yii;
use yii\base\InvalidConfigException;

/**
 * Instance represents a reference to a named object in a dependency injection (DI) container or a service locator.
 *
 * You may use [[get()]] to obtain the actual object referenced by [[id]].
 *
 * Instance is mainly used in two places:
 *
 * - When configuring a dependency injection container, you use Instance to reference a class name, interface name
 *   or alias name. The reference can later be resolved into the actual object by the container.
 * - In classes which use service locator to obtain dependent objects.
 *
 * The following example shows how to configure a DI container with Instance:
 *
 * ```php
 * $container = new \yii\di\Container;
 * $container->set('cache', [
 *     'class' => 'yii\caching\DbCache',
 *     'db' => Instance::of('db')
 * ]);
 * $container->set('db', [
 *     'class' => 'yii\db\Connection',
 *     'dsn' => 'sqlite:path/to/file.db',
 * ]);
 * ```
 *
 * And the following example shows how a class retrieves a component from a service locator:
 *
 * ```php
 * class DbCache extends Cache
 * {
 *     public $db = 'db';
 *
 *     public function init()
 *     {
 *         parent::init();
 *         $this->db = Instance::ensure($this->db, 'yii\db\Connection');
 *     }
 * }
 * ```
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class Instance
{
    /**
     * @var string the component ID, class name, interface name or alias name
     */
    public $id;


    /**
     * Constructor.
     * @param string $id the component ID
     */
    protected function __construct($id)
    {
        $this->id = $id;
    }

    /**
     * Creates a new Instance object.
     * @param string $id the component ID
     * @return Instance the new Instance object.
     */
    public static function of($id)
    {
        return new static($id);
    }

    /**
     * Resolves the specified reference into the actual object and makes sure it is of the specified type.
     *
     * The reference may be specified as a string or an Instance object. If the former,
     * it will be treated as a component ID, a class/interface name or an alias, depending on the container type.
     *
     * If you do not specify a container, the method will first try `Yii::$app` followed by `Yii::$container`.
     *
     * For example,
     *
     * ```php
     * use yii\db\Connection;
     *
     * // returns Yii::$app->db
     * $db = Instance::ensure('db', Connection::className());
     * // returns an instance of Connection using the given configuration
     * $db = Instance::ensure(['dsn' => 'sqlite:path/to/my.db'], Connection::className());
     * ```
     *
     * @param object|string|array|static $reference an object or a reference to the desired object.
     * You may specify a reference in terms of a component ID or an Instance object.
     * Starting from version 2.0.2, you may also pass in a configuration array for creating the object.
     * If the "class" value is not specified in the configuration array, it will use the value of `$type`.
     * @param string $type the class/interface name to be checked. If null, type check will not be performed.
     * @param ServiceLocator|Container $container the container. This will be passed to [[get()]].
     * @return object the object referenced by the Instance, or `$reference` itself if it is an object.
     * @throws InvalidConfigException if the reference is invalid
     */
    public static function ensure($reference, $type = null, $container = null)
    {
        if (is_array($reference)) {
            $class = isset($reference['class']) ? $reference['class'] : $type;
            if (!$container instanceof Container) {
                $container = Yii::$container;
            }
            unset($reference['class']);
            return $container->get($class, [], $reference);
        } elseif (empty($reference)) {
            throw new InvalidConfigException('The required component is not specified.');
        }

        if (is_string($reference)) {
            $reference = new static($reference);
        } elseif ($type === null || $reference instanceof $type) {
            return $reference;
        }

        if ($reference instanceof self) {
            $component = $reference->get($container);
            if ($type === null || $component instanceof $type) {
                return $component;
            } else {
                throw new InvalidConfigException('"' . $reference->id . '" refers to a ' . get_class($component) . " component. $type is expected.");
            }
        }

        $valueType = is_object($reference) ? get_class($reference) : gettype($reference);
        throw new InvalidConfigException("Invalid data type: $valueType. $type is expected.");
    }

    /**
     * Returns the actual object referenced by this Instance object.
     * @param ServiceLocator|Container $container the container used to locate the referenced object.
     * If null, the method will first try `Yii::$app` then `Yii::$container`.
     * @return object the actual object referenced by this Instance object.
     */
    public function get($container = null)
    {
        if ($container) {
            return $container->get($this->id);
        }
        if (Yii::$app && Yii::$app->has($this->id)) {
            return Yii::$app->get($this->id);
        } else {
            return Yii::$container->get($this->id);
        }
    }
}
ServiceLocator.php000066600000022160151456237140010216 0ustar00<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\di;

use Yii;
use Closure;
use yii\base\Component;
use yii\base\InvalidConfigException;

/**
 * ServiceLocator implements a [service locator](http://en.wikipedia.org/wiki/Service_locator_pattern).
 *
 * To use ServiceLocator, you first need to register component IDs with the corresponding component
 * definitions with the locator by calling [[set()]] or [[setComponents()]].
 * You can then call [[get()]] to retrieve a component with the specified ID. The locator will automatically
 * instantiate and configure the component according to the definition.
 *
 * For example,
 *
 * ```php
 * $locator = new \yii\di\ServiceLocator;
 * $locator->setComponents([
 *     'db' => [
 *         'class' => 'yii\db\Connection',
 *         'dsn' => 'sqlite:path/to/file.db',
 *     ],
 *     'cache' => [
 *         'class' => 'yii\caching\DbCache',
 *         'db' => 'db',
 *     ],
 * ]);
 *
 * $db = $locator->get('db');  // or $locator->db
 * $cache = $locator->get('cache');  // or $locator->cache
 * ```
 *
 * Because [[\yii\base\Module]] extends from ServiceLocator, modules and the application are all service locators.
 *
 * @property array $components The list of the component definitions or the loaded component instances (ID =>
 * definition or instance).
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class ServiceLocator extends Component
{
    /**
     * @var array shared component instances indexed by their IDs
     */
    private $_components = [];
    /**
     * @var array component definitions indexed by their IDs
     */
    private $_definitions = [];


    /**
     * Getter magic method.
     * This method is overridden to support accessing components like reading properties.
     * @param string $name component or property name
     * @return mixed the named property value
     */
    public function __get($name)
    {
        if ($this->has($name)) {
            return $this->get($name);
        } else {
            return parent::__get($name);
        }
    }

    /**
     * Checks if a property value is null.
     * This method overrides the parent implementation by checking if the named component is loaded.
     * @param string $name the property name or the event name
     * @return boolean whether the property value is null
     */
    public function __isset($name)
    {
        if ($this->has($name, true)) {
            return true;
        } else {
            return parent::__isset($name);
        }
    }

    /**
     * Returns a value indicating whether the locator has the specified component definition or has instantiated the component.
     * This method may return different results depending on the value of `$checkInstance`.
     *
     * - If `$checkInstance` is false (default), the method will return a value indicating whether the locator has the specified
     *   component definition.
     * - If `$checkInstance` is true, the method will return a value indicating whether the locator has
     *   instantiated the specified component.
     *
     * @param string $id component ID (e.g. `db`).
     * @param boolean $checkInstance whether the method should check if the component is shared and instantiated.
     * @return boolean whether the locator has the specified component definition or has instantiated the component.
     * @see set()
     */
    public function has($id, $checkInstance = false)
    {
        return $checkInstance ? isset($this->_components[$id]) : isset($this->_definitions[$id]);
    }

    /**
     * Returns the component instance with the specified ID.
     *
     * @param string $id component ID (e.g. `db`).
     * @param boolean $throwException whether to throw an exception if `$id` is not registered with the locator before.
     * @return object|null the component of the specified ID. If `$throwException` is false and `$id`
     * is not registered before, null will be returned.
     * @throws InvalidConfigException if `$id` refers to a nonexistent component ID
     * @see has()
     * @see set()
     */
    public function get($id, $throwException = true)
    {
        if (isset($this->_components[$id])) {
            return $this->_components[$id];
        }

        if (isset($this->_definitions[$id])) {
            $definition = $this->_definitions[$id];
            if (is_object($definition) && !$definition instanceof Closure) {
                return $this->_components[$id] = $definition;
            } else {
                return $this->_components[$id] = Yii::createObject($definition);
            }
        } elseif ($throwException) {
            throw new InvalidConfigException("Unknown component ID: $id");
        } else {
            return null;
        }
    }

    /**
     * Registers a component definition with this locator.
     *
     * For example,
     *
     * ```php
     * // a class name
     * $locator->set('cache', 'yii\caching\FileCache');
     *
     * // a configuration array
     * $locator->set('db', [
     *     'class' => 'yii\db\Connection',
     *     'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
     *     'username' => 'root',
     *     'password' => '',
     *     'charset' => 'utf8',
     * ]);
     *
     * // an anonymous function
     * $locator->set('cache', function ($params) {
     *     return new \yii\caching\FileCache;
     * });
     *
     * // an instance
     * $locator->set('cache', new \yii\caching\FileCache);
     * ```
     *
     * If a component definition with the same ID already exists, it will be overwritten.
     *
     * @param string $id component ID (e.g. `db`).
     * @param mixed $definition the component definition to be registered with this locator.
     * It can be one of the following:
     *
     * - a class name
     * - a configuration array: the array contains name-value pairs that will be used to
     *   initialize the property values of the newly created object when [[get()]] is called.
     *   The `class` element is required and stands for the the class of the object to be created.
     * - a PHP callable: either an anonymous function or an array representing a class method (e.g. `['Foo', 'bar']`).
     *   The callable will be called by [[get()]] to return an object associated with the specified component ID.
     * - an object: When [[get()]] is called, this object will be returned.
     *
     * @throws InvalidConfigException if the definition is an invalid configuration array
     */
    public function set($id, $definition)
    {
        if ($definition === null) {
            unset($this->_components[$id], $this->_definitions[$id]);
            return;
        }

        unset($this->_components[$id]);

        if (is_object($definition) || is_callable($definition, true)) {
            // an object, a class name, or a PHP callable
            $this->_definitions[$id] = $definition;
        } elseif (is_array($definition)) {
            // a configuration array
            if (isset($definition['class'])) {
                $this->_definitions[$id] = $definition;
            } else {
                throw new InvalidConfigException("The configuration for the \"$id\" component must contain a \"class\" element.");
            }
        } else {
            throw new InvalidConfigException("Unexpected configuration type for the \"$id\" component: " . gettype($definition));
        }
    }

    /**
     * Removes the component from the locator.
     * @param string $id the component ID
     */
    public function clear($id)
    {
        unset($this->_definitions[$id], $this->_components[$id]);
    }

    /**
     * Returns the list of the component definitions or the loaded component instances.
     * @param boolean $returnDefinitions whether to return component definitions instead of the loaded component instances.
     * @return array the list of the component definitions or the loaded component instances (ID => definition or instance).
     */
    public function getComponents($returnDefinitions = true)
    {
        return $returnDefinitions ? $this->_definitions : $this->_components;
    }

    /**
     * Registers a set of component definitions in this locator.
     *
     * This is the bulk version of [[set()]]. The parameter should be an array
     * whose keys are component IDs and values the corresponding component definitions.
     *
     * For more details on how to specify component IDs and definitions, please refer to [[set()]].
     *
     * If a component definition with the same ID already exists, it will be overwritten.
     *
     * The following is an example for registering two component definitions:
     *
     * ```php
     * [
     *     'db' => [
     *         'class' => 'yii\db\Connection',
     *         'dsn' => 'sqlite:path/to/file.db',
     *     ],
     *     'cache' => [
     *         'class' => 'yii\caching\DbCache',
     *         'db' => 'db',
     *     ],
     * ]
     * ```
     *
     * @param array $components component definitions or instances
     */
    public function setComponents($components)
    {
        foreach ($components as $id => $component) {
            $this->set($id, $component);
        }
    }
}
NotInstantiableException.php000066600000001634151456237140012252 0ustar00<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\di;

use \yii\base\InvalidConfigException;

/**
 * NotInstantiableException represents an exception caused by incorrect dependency injection container
 * configuration or usage.
 *
 * @author Sam Mousa <sam@mousa.nl>
 * @since 2.0.9
 */
class NotInstantiableException extends InvalidConfigException
{
    /**
     * @inheritdoc
     */
    public function __construct($class, $message = null, $code = 0, \Exception $previous = null)
    {
        if ($message === null) {
            $message = "Can not instantiate $class.";
        }
        parent::__construct($message, $code, $previous);
    }

    /**
     * @return string the user-friendly name of this exception
     */
    public function getName()
    {
        return 'Not instantiable';
    }
}
Container.php000066600000055062151456237140007223 0ustar00<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\di;

use ReflectionClass;
use Yii;
use yii\base\Component;
use yii\base\InvalidConfigException;
use yii\helpers\ArrayHelper;

/**
 * Container implements a [dependency injection](http://en.wikipedia.org/wiki/Dependency_injection) container.
 *
 * A dependency injection (DI) container is an object that knows how to instantiate and configure objects and
 * all their dependent objects. For more information about DI, please refer to
 * [Martin Fowler's article](http://martinfowler.com/articles/injection.html).
 *
 * Container supports constructor injection as well as property injection.
 *
 * To use Container, you first need to set up the class dependencies by calling [[set()]].
 * You then call [[get()]] to create a new class object. Container will automatically instantiate
 * dependent objects, inject them into the object being created, configure and finally return the newly created object.
 *
 * By default, [[\Yii::$container]] refers to a Container instance which is used by [[\Yii::createObject()]]
 * to create new object instances. You may use this method to replace the `new` operator
 * when creating a new object, which gives you the benefit of automatic dependency resolution and default
 * property configuration.
 *
 * Below is an example of using Container:
 *
 * ```php
 * namespace app\models;
 *
 * use yii\base\Object;
 * use yii\db\Connection;
 * use yii\di\Container;
 *
 * interface UserFinderInterface
 * {
 *     function findUser();
 * }
 *
 * class UserFinder extends Object implements UserFinderInterface
 * {
 *     public $db;
 *
 *     public function __construct(Connection $db, $config = [])
 *     {
 *         $this->db = $db;
 *         parent::__construct($config);
 *     }
 *
 *     public function findUser()
 *     {
 *     }
 * }
 *
 * class UserLister extends Object
 * {
 *     public $finder;
 *
 *     public function __construct(UserFinderInterface $finder, $config = [])
 *     {
 *         $this->finder = $finder;
 *         parent::__construct($config);
 *     }
 * }
 *
 * $container = new Container;
 * $container->set('yii\db\Connection', [
 *     'dsn' => '...',
 * ]);
 * $container->set('app\models\UserFinderInterface', [
 *     'class' => 'app\models\UserFinder',
 * ]);
 * $container->set('userLister', 'app\models\UserLister');
 *
 * $lister = $container->get('userLister');
 *
 * // which is equivalent to:
 *
 * $db = new \yii\db\Connection(['dsn' => '...']);
 * $finder = new UserFinder($db);
 * $lister = new UserLister($finder);
 * ```
 *
 * @property array $definitions The list of the object definitions or the loaded shared objects (type or ID =>
 * definition or instance). This property is read-only.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class Container extends Component
{
    /**
     * @var array singleton objects indexed by their types
     */
    private $_singletons = [];
    /**
     * @var array object definitions indexed by their types
     */
    private $_definitions = [];
    /**
     * @var array constructor parameters indexed by object types
     */
    private $_params = [];
    /**
     * @var array cached ReflectionClass objects indexed by class/interface names
     */
    private $_reflections = [];
    /**
     * @var array cached dependencies indexed by class/interface names. Each class name
     * is associated with a list of constructor parameter types or default values.
     */
    private $_dependencies = [];


    /**
     * Returns an instance of the requested class.
     *
     * You may provide constructor parameters (`$params`) and object configurations (`$config`)
     * that will be used during the creation of the instance.
     *
     * If the class implements [[\yii\base\Configurable]], the `$config` parameter will be passed as the last
     * parameter to the class constructor; Otherwise, the configuration will be applied *after* the object is
     * instantiated.
     *
     * Note that if the class is declared to be singleton by calling [[setSingleton()]],
     * the same instance of the class will be returned each time this method is called.
     * In this case, the constructor parameters and object configurations will be used
     * only if the class is instantiated the first time.
     *
     * @param string $class the class name or an alias name (e.g. `foo`) that was previously registered via [[set()]]
     * or [[setSingleton()]].
     * @param array $params a list of constructor parameter values. The parameters should be provided in the order
     * they appear in the constructor declaration. If you want to skip some parameters, you should index the remaining
     * ones with the integers that represent their positions in the constructor parameter list.
     * @param array $config a list of name-value pairs that will be used to initialize the object properties.
     * @return object an instance of the requested class.
     * @throws InvalidConfigException if the class cannot be recognized or correspond to an invalid definition
     * @throws NotInstantiableException If resolved to an abstract class or an interface (since 2.0.9)
     */
    public function get($class, $params = [], $config = [])
    {
        if (isset($this->_singletons[$class])) {
            // singleton
            return $this->_singletons[$class];
        } elseif (!isset($this->_definitions[$class])) {
            return $this->build($class, $params, $config);
        }

        $definition = $this->_definitions[$class];

        if (is_callable($definition, true)) {
            $params = $this->resolveDependencies($this->mergeParams($class, $params));
            $object = call_user_func($definition, $this, $params, $config);
        } elseif (is_array($definition)) {
            $concrete = $definition['class'];
            unset($definition['class']);

            $config = array_merge($definition, $config);
            $params = $this->mergeParams($class, $params);

            if ($concrete === $class) {
                $object = $this->build($class, $params, $config);
            } else {
                $object = $this->get($concrete, $params, $config);
            }
        } elseif (is_object($definition)) {
            return $this->_singletons[$class] = $definition;
        } else {
            throw new InvalidConfigException('Unexpected object definition type: ' . gettype($definition));
        }

        if (array_key_exists($class, $this->_singletons)) {
            // singleton
            $this->_singletons[$class] = $object;
        }

        return $object;
    }

    /**
     * Registers a class definition with this container.
     *
     * For example,
     *
     * ```php
     * // register a class name as is. This can be skipped.
     * $container->set('yii\db\Connection');
     *
     * // register an interface
     * // When a class depends on the interface, the corresponding class
     * // will be instantiated as the dependent object
     * $container->set('yii\mail\MailInterface', 'yii\swiftmailer\Mailer');
     *
     * // register an alias name. You can use $container->get('foo')
     * // to create an instance of Connection
     * $container->set('foo', 'yii\db\Connection');
     *
     * // register a class with configuration. The configuration
     * // will be applied when the class is instantiated by get()
     * $container->set('yii\db\Connection', [
     *     'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
     *     'username' => 'root',
     *     'password' => '',
     *     'charset' => 'utf8',
     * ]);
     *
     * // register an alias name with class configuration
     * // In this case, a "class" element is required to specify the class
     * $container->set('db', [
     *     'class' => 'yii\db\Connection',
     *     'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
     *     'username' => 'root',
     *     'password' => '',
     *     'charset' => 'utf8',
     * ]);
     *
     * // register a PHP callable
     * // The callable will be executed when $container->get('db') is called
     * $container->set('db', function ($container, $params, $config) {
     *     return new \yii\db\Connection($config);
     * });
     * ```
     *
     * If a class definition with the same name already exists, it will be overwritten with the new one.
     * You may use [[has()]] to check if a class definition already exists.
     *
     * @param string $class class name, interface name or alias name
     * @param mixed $definition the definition associated with `$class`. It can be one of the following:
     *
     * - a PHP callable: The callable will be executed when [[get()]] is invoked. The signature of the callable
     *   should be `function ($container, $params, $config)`, where `$params` stands for the list of constructor
     *   parameters, `$config` the object configuration, and `$container` the container object. The return value
     *   of the callable will be returned by [[get()]] as the object instance requested.
     * - a configuration array: the array contains name-value pairs that will be used to initialize the property
     *   values of the newly created object when [[get()]] is called. The `class` element stands for the
     *   the class of the object to be created. If `class` is not specified, `$class` will be used as the class name.
     * - a string: a class name, an interface name or an alias name.
     * @param array $params the list of constructor parameters. The parameters will be passed to the class
     * constructor when [[get()]] is called.
     * @return $this the container itself
     */
    public function set($class, $definition = [], array $params = [])
    {
        $this->_definitions[$class] = $this->normalizeDefinition($class, $definition);
        $this->_params[$class] = $params;
        unset($this->_singletons[$class]);
        return $this;
    }

    /**
     * Registers a class definition with this container and marks the class as a singleton class.
     *
     * This method is similar to [[set()]] except that classes registered via this method will only have one
     * instance. Each time [[get()]] is called, the same instance of the specified class will be returned.
     *
     * @param string $class class name, interface name or alias name
     * @param mixed $definition the definition associated with `$class`. See [[set()]] for more details.
     * @param array $params the list of constructor parameters. The parameters will be passed to the class
     * constructor when [[get()]] is called.
     * @return $this the container itself
     * @see set()
     */
    public function setSingleton($class, $definition = [], array $params = [])
    {
        $this->_definitions[$class] = $this->normalizeDefinition($class, $definition);
        $this->_params[$class] = $params;
        $this->_singletons[$class] = null;
        return $this;
    }

    /**
     * Returns a value indicating whether the container has the definition of the specified name.
     * @param string $class class name, interface name or alias name
     * @return boolean whether the container has the definition of the specified name..
     * @see set()
     */
    public function has($class)
    {
        return isset($this->_definitions[$class]);
    }

    /**
     * Returns a value indicating whether the given name corresponds to a registered singleton.
     * @param string $class class name, interface name or alias name
     * @param boolean $checkInstance whether to check if the singleton has been instantiated.
     * @return boolean whether the given name corresponds to a registered singleton. If `$checkInstance` is true,
     * the method should return a value indicating whether the singleton has been instantiated.
     */
    public function hasSingleton($class, $checkInstance = false)
    {
        return $checkInstance ? isset($this->_singletons[$class]) : array_key_exists($class, $this->_singletons);
    }

    /**
     * Removes the definition for the specified name.
     * @param string $class class name, interface name or alias name
     */
    public function clear($class)
    {
        unset($this->_definitions[$class], $this->_singletons[$class]);
    }

    /**
     * Normalizes the class definition.
     * @param string $class class name
     * @param string|array|callable $definition the class definition
     * @return array the normalized class definition
     * @throws InvalidConfigException if the definition is invalid.
     */
    protected function normalizeDefinition($class, $definition)
    {
        if (empty($definition)) {
            return ['class' => $class];
        } elseif (is_string($definition)) {
            return ['class' => $definition];
        } elseif (is_callable($definition, true) || is_object($definition)) {
            return $definition;
        } elseif (is_array($definition)) {
            if (!isset($definition['class'])) {
                if (strpos($class, '\\') !== false) {
                    $definition['class'] = $class;
                } else {
                    throw new InvalidConfigException("A class definition requires a \"class\" member.");
                }
            }
            return $definition;
        } else {
            throw new InvalidConfigException("Unsupported definition type for \"$class\": " . gettype($definition));
        }
    }

    /**
     * Returns the list of the object definitions or the loaded shared objects.
     * @return array the list of the object definitions or the loaded shared objects (type or ID => definition or instance).
     */
    public function getDefinitions()
    {
        return $this->_definitions;
    }

    /**
     * Creates an instance of the specified class.
     * This method will resolve dependencies of the specified class, instantiate them, and inject
     * them into the new instance of the specified class.
     * @param string $class the class name
     * @param array $params constructor parameters
     * @param array $config configurations to be applied to the new instance
     * @return object the newly created instance of the specified class
     * @throws NotInstantiableException If resolved to an abstract class or an interface (since 2.0.9)
     */
    protected function build($class, $params, $config)
    {
        /* @var $reflection ReflectionClass */
        list ($reflection, $dependencies) = $this->getDependencies($class);

        foreach ($params as $index => $param) {
            $dependencies[$index] = $param;
        }

        $dependencies = $this->resolveDependencies($dependencies, $reflection);
        if (!$reflection->isInstantiable()) {
            throw new NotInstantiableException($reflection->name);
        }
        if (empty($config)) {
            return $reflection->newInstanceArgs($dependencies);
        }

        if (!empty($dependencies) && $reflection->implementsInterface('yii\base\Configurable')) {
            // set $config as the last parameter (existing one will be overwritten)
            $dependencies[count($dependencies) - 1] = $config;
            return $reflection->newInstanceArgs($dependencies);
        } else {
            $object = $reflection->newInstanceArgs($dependencies);
            foreach ($config as $name => $value) {
                $object->$name = $value;
            }
            return $object;
        }
    }

    /**
     * Merges the user-specified constructor parameters with the ones registered via [[set()]].
     * @param string $class class name, interface name or alias name
     * @param array $params the constructor parameters
     * @return array the merged parameters
     */
    protected function mergeParams($class, $params)
    {
        if (empty($this->_params[$class])) {
            return $params;
        } elseif (empty($params)) {
            return $this->_params[$class];
        } else {
            $ps = $this->_params[$class];
            foreach ($params as $index => $value) {
                $ps[$index] = $value;
            }
            return $ps;
        }
    }

    /**
     * Returns the dependencies of the specified class.
     * @param string $class class name, interface name or alias name
     * @return array the dependencies of the specified class.
     */
    protected function getDependencies($class)
    {
        if (isset($this->_reflections[$class])) {
            return [$this->_reflections[$class], $this->_dependencies[$class]];
        }

        $dependencies = [];
        $reflection = new ReflectionClass($class);

        $constructor = $reflection->getConstructor();
        if ($constructor !== null) {
            foreach ($constructor->getParameters() as $param) {
                if ($param->isDefaultValueAvailable()) {
                    $dependencies[] = $param->getDefaultValue();
                } else {
                    $c = $param->getClass();
                    $dependencies[] = Instance::of($c === null ? null : $c->getName());
                }
            }
        }

        $this->_reflections[$class] = $reflection;
        $this->_dependencies[$class] = $dependencies;

        return [$reflection, $dependencies];
    }

    /**
     * Resolves dependencies by replacing them with the actual object instances.
     * @param array $dependencies the dependencies
     * @param ReflectionClass $reflection the class reflection associated with the dependencies
     * @return array the resolved dependencies
     * @throws InvalidConfigException if a dependency cannot be resolved or if a dependency cannot be fulfilled.
     */
    protected function resolveDependencies($dependencies, $reflection = null)
    {
        foreach ($dependencies as $index => $dependency) {
            if ($dependency instanceof Instance) {
                if ($dependency->id !== null) {
                    $dependencies[$index] = $this->get($dependency->id);
                } elseif ($reflection !== null) {
                    $name = $reflection->getConstructor()->getParameters()[$index]->getName();
                    $class = $reflection->getName();
                    throw new InvalidConfigException("Missing required parameter \"$name\" when instantiating \"$class\".");
                }
            }
        }
        return $dependencies;
    }

    /**
     * Invoke a callback with resolving dependencies in parameters.
     *
     * This methods allows invoking a callback and let type hinted parameter names to be
     * resolved as objects of the Container. It additionally allow calling function using named parameters.
     *
     * For example, the following callback may be invoked using the Container to resolve the formatter dependency:
     *
     * ```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, $params = [])
    {
        if (is_callable($callback)) {
            return call_user_func_array($callback, $this->resolveCallableDependencies($callback, $params));
        } else {
            return call_user_func_array($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]);
        } else {
            $reflection = new \ReflectionFunction($callback);
        }

        $args = [];

        $associative = ArrayHelper::isAssociative($params);

        foreach ($reflection->getParameters() as $param) {
            $name = $param->getName();
            if (($class = $param->getClass()) !== null) {
                $className = $class->getName();
                if ($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;
    }
}
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