ServiceLocator::getComponents() - Code Metrics - Inspection of "Fix MySQL database setup for ubuntu trusty" - yiisoft/yii2 - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — prepare-travis-for-js ( a7ee60...8c0a43 )

by Carsten

created 2016-12-01 09:34 UTC

ServiceLocator::getComponents() A

↳ Parent: ServiceLocator

Complexity

Conditions	2
Paths	2

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	2

Importance

Changes

Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
ccs	2
cts	2
cp	1
cc	2
eloc	2
nc	2
nop	1
crap	2

<?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.
 *
 * For more details and usage information on ServiceLocator, see the [guide article on service locators](guide:concept-service-locator).
 *
 * @property array $components The list of the component definitions or the loaded component instances (ID =>
 * definition or instance).
 *
 * @author Qiang Xue <[email protected]>
 * @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 $name the property name or the event name
     * @return bool whether the property value is null
     */
    public function __isset($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 bool $checkInstance whether the method should check if the component is shared and instantiated.
     * @return bool whether the locator has the specified component definition or has instantiated the component.
     * @see set()
     */
    public function has($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 bool $throwException whether to throw an exception if `$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 bool $returnDefinitions whether to return component definitions instead of the loaded component instances.
     * @return array the list of the component definitions or the loaded component instances (ID => definition or instance).
     */
    public function getComponents($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);
        }
    }
}


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 Closure;
12		use yii\base\Component;
13		use yii\base\InvalidConfigException;
14
15		/**
16		* ServiceLocator implements a [service locator](http://en.wikipedia.org/wiki/Service_locator_pattern).
17		*
18		* To use ServiceLocator, you first need to register component IDs with the corresponding component
19		* definitions with the locator by calling [[set()]] or [[setComponents()]].
20		* You can then call [[get()]] to retrieve a component with the specified ID. The locator will automatically
21		* instantiate and configure the component according to the definition.
22		*
23		* For example,
24		*
25		* ```php
26		* $locator = new \yii\di\ServiceLocator;
27		* $locator->setComponents([
28		* 'db' => [
29		* 'class' => 'yii\db\Connection',
30		* 'dsn' => 'sqlite:path/to/file.db',
31		* ],
32		* 'cache' => [
33		* 'class' => 'yii\caching\DbCache',
34		* 'db' => 'db',
35		* ],
36		* ]);
37		*
38		* $db = $locator->get('db'); // or $locator->db
39		* $cache = $locator->get('cache'); // or $locator->cache
40		* ```
41		*
42		* Because [[\yii\base\Module]] extends from ServiceLocator, modules and the application are all service locators.
43		*
44		* For more details and usage information on ServiceLocator, see the [guide article on service locators](guide:concept-service-locator).
45		*
46		* @property array $components The list of the component definitions or the loaded component instances (ID =>
47		* definition or instance).
48		*
49		* @author Qiang Xue <[email protected]>
50		* @since 2.0
51		*/
52		class ServiceLocator extends Component
53		{
54		/**
55		* @var array shared component instances indexed by their IDs
56		*/
57		private $_components = [];
58		/**
59		* @var array component definitions indexed by their IDs
60		*/
61		private $_definitions = [];
62
63
64		/**
65		* Getter magic method.
66		* This method is overridden to support accessing components like reading properties.
67		* @param string $name component or property name
68		* @return mixed the named property value
69		*/
70	310	public function __get($name)
71		{
72	310	if ($this->has($name)) {
73	58	return $this->get($name);
74		} else {
75	262	return parent::__get($name);
76		}
77		}
78
79		/**
80		* Checks if a property value is null.
81		* This method overrides the parent implementation by checking if the named component is loaded.
82		* @param string $name the property name or the event name
83		* @return bool whether the property value is null
84		*/
85		public function __isset($name)
86		{
87		if ($this->has($name, true)) {
88		return true;
89		} else {
90		return parent::__isset($name);
91		}
92		}
93
94		/**
95		* Returns a value indicating whether the locator has the specified component definition or has instantiated the component.
96		* This method may return different results depending on the value of `$checkInstance`.
97		*
98		* - If `$checkInstance` is false (default), the method will return a value indicating whether the locator has the specified
99		* component definition.
100		* - If `$checkInstance` is true, the method will return a value indicating whether the locator has
101		* instantiated the specified component.
102		*
103		* @param string $id component ID (e.g. `db`).
104		* @param bool $checkInstance whether the method should check if the component is shared and instantiated.
105		* @return bool whether the locator has the specified component definition or has instantiated the component.
106		* @see set()
107		*/
108	2057	public function has($id, $checkInstance = false)
109		{
110	2057	return $checkInstance ? isset($this->_components[$id]) : isset($this->_definitions[$id]);
111		}
112
113		/**
114		* Returns the component instance with the specified ID.
115		*
116		* @param string $id component ID (e.g. `db`).
117		* @param bool $throwException whether to throw an exception if `$id` is not registered with the locator before.
118		* @return object\|null the component of the specified ID. If `$throwException` is false and `$id`
119		* is not registered before, null will be returned.
120		* @throws InvalidConfigException if `$id` refers to a nonexistent component ID
121		* @see has()
122		* @see set()
123		*/
124	816	public function get($id, $throwException = true)
125		{
126	816	if (isset($this->_components[$id])) {
127	616	return $this->_components[$id];
128		}
129
130	816	if (isset($this->_definitions[$id])) {
131	799	$definition = $this->_definitions[$id];
132	799	if (is_object($definition) && !$definition instanceof Closure) {
133	15	return $this->_components[$id] = $definition;
134		} else {
135	784	return $this->_components[$id] = Yii::createObject($definition);
136		}
137	30	} elseif ($throwException) {
138		throw new InvalidConfigException("Unknown component ID: $id");
139		} else {
140	30	return null;
141		}
142		}
143
144		/**
145		* Registers a component definition with this locator.
146		*
147		* For example,
148		*
149		* ```php
150		* // a class name
151		* $locator->set('cache', 'yii\caching\FileCache');
152		*
153		* // a configuration array
154		* $locator->set('db', [
155		* 'class' => 'yii\db\Connection',
156		* 'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
157		* 'username' => 'root',
158		* 'password' => '',
159		* 'charset' => 'utf8',
160		* ]);
161		*
162		* // an anonymous function
163		* $locator->set('cache', function ($params) {
164		* return new \yii\caching\FileCache;
165		* });
166		*
167		* // an instance
168		* $locator->set('cache', new \yii\caching\FileCache);
169		* ```
170		*
171		* If a component definition with the same ID already exists, it will be overwritten.
172		*
173		* @param string $id component ID (e.g. `db`).
174		* @param mixed $definition the component definition to be registered with this locator.
175		* It can be one of the following:
176		*
177		* - a class name
178		* - a configuration array: the array contains name-value pairs that will be used to
179		* initialize the property values of the newly created object when [[get()]] is called.
180		* The `class` element is required and stands for the the class of the object to be created.
181		* - a PHP callable: either an anonymous function or an array representing a class method (e.g. `['Foo', 'bar']`).
182		* The callable will be called by [[get()]] to return an object associated with the specified component ID.
183		* - an object: When [[get()]] is called, this object will be returned.
184		*
185		* @throws InvalidConfigException if the definition is an invalid configuration array
186		*/
187	2185	public function set($id, $definition)
188		{
189	2185	if ($definition === null) {
190		unset($this->_components[$id], $this->_definitions[$id]);
191		return;
192		}
193
194	2185	unset($this->_components[$id]);
195
196	2185	if (is_object($definition) \|\| is_callable($definition, true)) {
197		// an object, a class name, or a PHP callable
198	29	$this->_definitions[$id] = $definition;
199	2185	} elseif (is_array($definition)) {
200		// a configuration array
201	2183	if (isset($definition['class'])) {
202	2183	$this->_definitions[$id] = $definition;
203	2183	} else {
204		throw new InvalidConfigException("The configuration for the \"$id\" component must contain a \"class\" element.");
205		}
206	2183	} else {
207		throw new InvalidConfigException("Unexpected configuration type for the \"$id\" component: " . gettype($definition));
208		}
209	2185	}
210
211		/**
212		* Removes the component from the locator.
213		* @param string $id the component ID
214		*/
215		public function clear($id)
216		{
217		unset($this->_definitions[$id], $this->_components[$id]);
218		}
219
220		/**
221		* Returns the list of the component definitions or the loaded component instances.
222		* @param bool $returnDefinitions whether to return component definitions instead of the loaded component instances.
223		* @return array the list of the component definitions or the loaded component instances (ID => definition or instance).
224		*/
225	4	public function getComponents($returnDefinitions = true)
226		{
227	4	return $returnDefinitions ? $this->_definitions : $this->_components;
228		}
229
230		/**
231		* Registers a set of component definitions in this locator.
232		*
233		* This is the bulk version of [[set()]]. The parameter should be an array
234		* whose keys are component IDs and values the corresponding component definitions.
235		*
236		* For more details on how to specify component IDs and definitions, please refer to [[set()]].
237		*
238		* If a component definition with the same ID already exists, it will be overwritten.
239		*
240		* The following is an example for registering two component definitions:
241		*
242		* ```php
243		* [
244		* 'db' => [
245		* 'class' => 'yii\db\Connection',
246		* 'dsn' => 'sqlite:path/to/file.db',
247		* ],
248		* 'cache' => [
249		* 'class' => 'yii\caching\DbCache',
250		* 'db' => 'db',
251		* ],
252		* ]
253		* ```
254		*
255		* @param array $components component definitions or instances
256		*/
257	2182	public function setComponents($components)
258		{
259	2182	foreach ($components as $id => $component) {
260	2182	$this->set($id, $component);
261	2182	}
262	2182	}
263		}
264

yiisoft / yii2

Push — prepare-travis-for-js ( a7ee60...8c0a43 )

ServiceLocator::getComponents() A

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