DoctrineWriter::loadAssociationObjectsToObject() - Code Metrics - Inspection of "Remove unused code block" - portphp/doctrine - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 35cd7c...bbee21 )

by David de

created 2017-09-01 13:51 UTC

DoctrineWriter::loadAssociationObjectsToObject() B

↳ Parent: DoctrineWriter

Complexity

Conditions	5
Paths	5

Size

Total Lines	17
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	10
CRAP Score	5.1158

Importance

Changes

Metric	Value
dl	0
loc	17
ccs	10
cts	12
cp	0.8333
rs	8.8571
c	0
b	0
f	0
cc	5
eloc	9
nc	5
nop	2
crap	5.1158

<?php

namespace Port\Doctrine;

use Port\Doctrine\Exception\UnsupportedDatabaseTypeException;
use Port\Writer;
use Doctrine\Common\Util\Inflector;
use Doctrine\DBAL\Logging\SQLLogger;
use Doctrine\Common\Persistence\ObjectManager;
use Doctrine\Common\Persistence\Mapping\ClassMetadata;

/**
 * A bulk Doctrine writer
 *
 * See also the {@link http://www.doctrine-project.org/docs/orm/2.1/en/reference/batch-processing.html Doctrine documentation}
 * on batch processing.
 *
 * @author David de Boer <[email protected]>
 */
class DoctrineWriter implements Writer, Writer\FlushableWriter
{
    /**
     * Doctrine object manager
     *
     * @var ObjectManager
     */
    protected $objectManager;

    /**
     * Fully qualified model name
     *
     * @var string
     */
    protected $objectName;

    /**
     * Doctrine object repository
     *
     * @var ObjectRepository
     */
    protected $objectRepository;

    /**
     * @var ClassMetadata
     */
    protected $objectMetadata;

    /**
     * Original Doctrine logger
     *
     * @var SQLLogger
     */
    protected $originalLogger;

    /**
     * Whether to truncate the table first
     *
     * @var boolean
     */
    protected $truncate = true;

    /**
     * List of fields used to lookup an object
     *
     * @var array
     */
    protected $lookupFields = [];

    /**
     * Method used for looking up the item
     *
     * @var array
     */
    protected $lookupMethod;

    /**
     * Constructor
     *
     * @param ObjectManager $objectManager
     * @param string        $objectName
     * @param string|array  $index         Field or fields to find current entities by
     * @param string        $lookupMethod  Method used for looking up the item
     */
    public function __construct(
        ObjectManager $objectManager,
        $objectName,
        $index = null,
        $lookupMethod = 'findOneBy'
    ) {
        $this->ensureSupportedObjectManager($objectManager);
        $this->objectManager = $objectManager;
        $this->objectRepository = $objectManager->getRepository($objectName);

        $this->objectMetadata = $objectManager->getClassMetadata($objectName);
        //translate objectName in case a namespace alias is used
        $this->objectName = $this->objectMetadata->getName();
        if ($index) {
            if (is_array($index)) {
                $this->lookupFields = $index;
            } else {
                $this->lookupFields = [$index];
            }
        }

        if (!method_exists($this->objectRepository, $lookupMethod)) {
            throw new \InvalidArgumentException(
                sprintf(
                    'Repository %s has no method %s',
                    get_class($this->objectRepository),
                    $lookupMethod
                )
            );
        }
        $this->lookupMethod = [$this->objectRepository, $lookupMethod];
    }

    /**
     * @return boolean
     */
    public function getTruncate()
    {
        return $this->truncate;
    }

    /**
     * Set whether to truncate the table first
     *
     * @param boolean $truncate
     *
     * @return $this
     */
    public function setTruncate($truncate)
    {
        $this->truncate = $truncate;

        return $this;
    }

    /**
     * Disable truncation
     *
     * @return $this
     */
    public function disableTruncate()
    {
        $this->truncate = false;

        return $this;
    }

    /**
     * Disable Doctrine logging
     *
     * @return $this
     */
    public function prepare()
    {
        $this->disableLogging();

        if (true === $this->truncate) {
            $this->truncateTable();
        }
    }

    /**
     * Re-enable Doctrine logging
     */
    public function finish()
    {
        $this->flush();
        $this->reEnableLogging();
    }

    /**
     * {@inheritdoc}
     */
    public function writeItem(array $item)
    {
        $object = $this->findOrCreateItem($item);

        $this->loadAssociationObjectsToObject($item, $object);
        $this->updateObject($item, $object);

        $this->objectManager->persist($object);
    }

    /**
     * Flush and clear the object manager
     */
    public function flush()
    {
        $this->objectManager->flush();
        $this->objectManager->clear($this->objectName);
    }

    /**
     * Return a new instance of the object
     *
     * @return object
     */
    protected function getNewInstance()
    {
        $className = $this->objectMetadata->getName();

        if (class_exists($className) === false) {
            throw new \RuntimeException('Unable to create new instance of ' . $className);
        }

        return new $className;
    }

    /**
     * Call a setter of the object
     *
     * @param object $object
     * @param mixed  $value
     * @param string $setter
     */
    protected function setValue($object, $value, $setter)
    {
        if (method_exists($object, $setter)) {
            $object->$setter($value);
        }
    }

    /**
     * @param array  $item
     * @param object $object
     */
    protected function updateObject(array $item, $object)
    {
        $fieldNames = array_merge($this->objectMetadata->getFieldNames(), $this->objectMetadata->getAssociationNames());
        foreach ($fieldNames as $fieldName) {
            $value = null;
            $classifiedFieldName = Inflector::classify($fieldName);
            if (isset($item[$fieldName])) {
                $value = $item[$fieldName];
            }

            if (null === $value) {
                continue;
            }

            if (!($value instanceof \DateTime)
                || $value != $this->objectMetadata->getFieldValue($object, $fieldName)
            ) {
                $setter = 'set' . $classifiedFieldName;
                $this->setValue($object, $value, $setter);
            }
        }
    }

    /**
     * Add the associated objects in case the item have for persist its relation
     *
     * @param array  $item
     * @param object $object
     */
    protected function loadAssociationObjectsToObject(array $item, $object)
    {
        foreach ($this->objectMetadata->getAssociationMappings() as $associationMapping) {
interface User
{
    /** @return string */
    public function getPassword();
}

class MyUser implements User
{
    public function getPassword()
    {
        // return something
    }

    public function getDisplayName()
    {
        // return some name.
    }
}

class AuthSystem
{
    public function authenticate(User $user)
    {
        $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName()));
        // do something.
    }
}

            $value = null;
            if (isset($item[$associationMapping['fieldName']]) && !is_object($item[$associationMapping['fieldName']])) {
                $value = $this->objectManager->getReference($associationMapping['targetEntity'], $item[$associationMapping['fieldName']]);
interface User
{
    /** @return string */
    public function getPassword();
}

class MyUser implements User
{
    public function getPassword()
    {
        // return something
    }

    public function getDisplayName()
    {
        // return some name.
    }
}

class AuthSystem
{
    public function authenticate(User $user)
    {
        $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName()));
        // do something.
    }
}
            }

            if (null === $value) {
                continue;
            }

            $setter = 'set' . ucfirst($associationMapping['fieldName']);
            $this->setValue($object, $value, $setter);
        }
    }

    /**
     * Truncate the database table for this writer
     */
    protected function truncateTable()
    {
        if ($this->objectManager instanceof \Doctrine\ORM\EntityManager) {
            $tableName = $this->objectMetadata->table['name'];
interface SomeInterface { }
class SomeClass implements SomeInterface {
    public $a;
}

function someFunction(SomeInterface $object) {
    if ($object instanceof SomeClass) {
        $a = $object->a;
    }
}
            $connection = $this->objectManager->getConnection();
            $query = $connection->getDatabasePlatform()->getTruncateTableSQL($tableName, true);
            $connection->executeQuery($query);
        } elseif ($this->objectManager instanceof \Doctrine\ODM\MongoDB\DocumentManager) {
            $this->objectManager->getDocumentCollection($this->objectName)->remove(array());
        }
    }

    /**
     * Disable Doctrine logging
     */
    protected function disableLogging()

    {
        //TODO: do we need to add support for MongoDB logging?
        if (!($this->objectManager instanceof \Doctrine\ORM\EntityManager)) return;

        $config = $this->objectManager->getConnection()->getConfiguration();
        $this->originalLogger = $config->getSQLLogger();
        $config->setSQLLogger(null);
    }

    /**
     * Re-enable Doctrine logging
     */
    protected function reEnableLogging()

    {
        //TODO: do we need to add support for MongoDB logging?
        if (!($this->objectManager instanceof \Doctrine\ORM\EntityManager)) return;

        $config = $this->objectManager->getConnection()->getConfiguration();
        $config->setSQLLogger($this->originalLogger);
    }

    /**
     * @param array $item
     *
     * @return object
     */
    protected function findOrCreateItem(array $item)
    {
        $object = null;
        // If the table was not truncated to begin with, find current object
        // first
        if (!$this->truncate) {
            if (!empty($this->lookupFields)) {
                $lookupConditions = array();
                foreach ($this->lookupFields as $fieldName) {
                    $lookupConditions[$fieldName] = $item[$fieldName];
                }

                $object = call_user_func($this->lookupMethod, $lookupConditions);
            } else {
                $object = $this->objectRepository->find(current($item));
            }
        }

        if (!$object) {
            return $this->getNewInstance();
        }

        return $object;
    }

    protected function ensureSupportedObjectManager(ObjectManager $objectManager)
    {
        if (!($objectManager instanceof \Doctrine\ORM\EntityManager
            || $objectManager instanceof \Doctrine\ODM\MongoDB\DocumentManager)
        ) {
            throw new UnsupportedDatabaseTypeException($objectManager);
        }
    }
}


Push — master ( 35cd7c...bbee21 )

DoctrineWriter::loadAssociationObjectsToObject() B

Complexity

Size

Duplication

Code Coverage

Importance

Available Fixes

Available Fixes

Available Fixes

1			<?php
2
3			namespace Port\Doctrine;
4
5			use Port\Doctrine\Exception\UnsupportedDatabaseTypeException;
6			use Port\Writer;
7			use Doctrine\Common\Util\Inflector;
8			use Doctrine\DBAL\Logging\SQLLogger;
9			use Doctrine\Common\Persistence\ObjectManager;
10			use Doctrine\Common\Persistence\Mapping\ClassMetadata;
11
12			/**
13			* A bulk Doctrine writer
14			*
15			* See also the {@link http://www.doctrine-project.org/docs/orm/2.1/en/reference/batch-processing.html Doctrine documentation}
16			* on batch processing.
17			*
18			* @author David de Boer <[email protected]>
19			*/
20			class DoctrineWriter implements Writer, Writer\FlushableWriter
21			{
22			/**
23			* Doctrine object manager
24			*
25			* @var ObjectManager
26			*/
27			protected $objectManager;
28
29			/**
30			* Fully qualified model name
31			*
32			* @var string
33			*/
34			protected $objectName;
35
36			/**
37			* Doctrine object repository
38			*
39			* @var ObjectRepository
40			*/
41			protected $objectRepository;
42
43			/**
44			* @var ClassMetadata
45			*/
46			protected $objectMetadata;
47
48			/**
49			* Original Doctrine logger
50			*
51			* @var SQLLogger
52			*/
53			protected $originalLogger;
54
55			/**
56			* Whether to truncate the table first
57			*
58			* @var boolean
59			*/
60			protected $truncate = true;
61
62			/**
63			* List of fields used to lookup an object
64			*
65			* @var array
66			*/
67			protected $lookupFields = [];
68
69			/**
70			* Method used for looking up the item
71			*
72			* @var array
73			*/
74			protected $lookupMethod;
75
76			/**
77			* Constructor
78			*
79			* @param ObjectManager $objectManager
80			* @param string $objectName
81			* @param string\|array $index Field or fields to find current entities by
82			* @param string $lookupMethod Method used for looking up the item
83			*/
84	6		public function __construct(
85			ObjectManager $objectManager,
86			$objectName,
87			$index = null,
88			$lookupMethod = 'findOneBy'
89			) {
90	6		$this->ensureSupportedObjectManager($objectManager);
91	5		$this->objectManager = $objectManager;
92	5		$this->objectRepository = $objectManager->getRepository($objectName);
			0 ignored issues – show Documentation Bug introduced 2017-01-27 12:03 UTC by Report Bug Copy Issue Report It seems like `$objectManager->getRepository($objectName)` of type `object<Doctrine\Common\P...tence\ObjectRepository>` is incompatible with the declared type `object<Port\Doctrine\ObjectRepository>` of property `$objectRepository`. Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. Loading history...
93	5		$this->objectMetadata = $objectManager->getClassMetadata($objectName);
94			//translate objectName in case a namespace alias is used
95	5		$this->objectName = $this->objectMetadata->getName();
96	5		if ($index) {
97			if (is_array($index)) {
98			$this->lookupFields = $index;
99			} else {
100			$this->lookupFields = [$index];
101			}
102			}
103
104	5		if (!method_exists($this->objectRepository, $lookupMethod)) {
105			throw new \InvalidArgumentException(
106			sprintf(
107			'Repository %s has no method %s',
108			get_class($this->objectRepository),
109			$lookupMethod
110			)
111			);
112			}
113	5		$this->lookupMethod = [$this->objectRepository, $lookupMethod];
114	5		}
115
116			/**
117			* @return boolean
118			*/
119			public function getTruncate()
120			{
121			return $this->truncate;
122			}
123
124			/**
125			* Set whether to truncate the table first
126			*
127			* @param boolean $truncate
128			*
129			* @return $this
130			*/
131			public function setTruncate($truncate)
132			{
133			$this->truncate = $truncate;
134
135			return $this;
136			}
137
138			/**
139			* Disable truncation
140			*
141			* @return $this
142			*/
143			public function disableTruncate()
144			{
145			$this->truncate = false;
146
147			return $this;
148			}
149
150			/**
151			* Disable Doctrine logging
152			*
153			* @return $this
154			*/
155	1		public function prepare()
156			{
157	1		$this->disableLogging();
158
159	1		if (true === $this->truncate) {
160	1		$this->truncateTable();
161	1		}
162	1		}
163
164			/**
165			* Re-enable Doctrine logging
166			*/
167	1		public function finish()
168			{
169	1		$this->flush();
170	1		$this->reEnableLogging();
171	1		}
172
173			/**
174			* {@inheritdoc}
175			*/
176	4		public function writeItem(array $item)
177			{
178	4		$object = $this->findOrCreateItem($item);
179
180	4		$this->loadAssociationObjectsToObject($item, $object);
181	4		$this->updateObject($item, $object);
182
183	4		$this->objectManager->persist($object);
184	4		}
185
186			/**
187			* Flush and clear the object manager
188			*/
189	1		public function flush()
190			{
191	1		$this->objectManager->flush();
192	1		$this->objectManager->clear($this->objectName);
193	1		}
194
195			/**
196			* Return a new instance of the object
197			*
198			* @return object
199			*/
200	4		protected function getNewInstance()
201			{
202	4		$className = $this->objectMetadata->getName();
203
204	4		if (class_exists($className) === false) {
205			throw new \RuntimeException('Unable to create new instance of ' . $className);
206			}
207
208	4		return new $className;
209			}
210
211			/**
212			* Call a setter of the object
213			*
214			* @param object $object
215			* @param mixed $value
216			* @param string $setter
217			*/
218	4		protected function setValue($object, $value, $setter)
219			{
220	4		if (method_exists($object, $setter)) {
221	4		$object->$setter($value);
222	4		}
223	4		}
224
225			/**
226			* @param array $item
227			* @param object $object
228			*/
229	4		protected function updateObject(array $item, $object)
230			{
231	4		$fieldNames = array_merge($this->objectMetadata->getFieldNames(), $this->objectMetadata->getAssociationNames());
232	4		foreach ($fieldNames as $fieldName) {
233	4		$value = null;
234	4		$classifiedFieldName = Inflector::classify($fieldName);
235	4		if (isset($item[$fieldName])) {
236	4		$value = $item[$fieldName];
237	4		}
238
239	4		if (null === $value) {
240			continue;
241			}
242
243	4		if (!($value instanceof \DateTime)
244	4		\|\| $value != $this->objectMetadata->getFieldValue($object, $fieldName)
245	4		) {
246	4		$setter = 'set' . $classifiedFieldName;
247	4		$this->setValue($object, $value, $setter);
248	4		}
249	4		}
250	4		}
251
252			/**
253			* Add the associated objects in case the item have for persist its relation
254			*
255			* @param array $item
256			* @param object $object
257			*/
258	4		protected function loadAssociationObjectsToObject(array $item, $object)
259			{
260	4		foreach ($this->objectMetadata->getAssociationMappings() as $associationMapping) {
			0 ignored issues – show Bug introduced 2017-01-27 12:03 UTC by Report Bug Copy Issue Report It seems like you code against a concrete implementation and not the interface `Doctrine\Common\Persistence\Mapping\ClassMetadata` as the method `getAssociationMappings()` does only exist in the following implementations of said interface: `Doctrine\ORM\Mapping\ClassMetadata`, `Doctrine\ORM\Mapping\ClassMetadataInfo`. Let’s take a look at an example: interface User { /** @return string / public function getPassword(); } class MyUser implements User { public function getPassword() { // return something } public function getDisplayName() { // return some name. } } class AuthSystem { public function authenticate(User $user) { $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName())); // do something. } } In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break. Available Fixes Change the type-hint for the parameter: class AuthSystem { public function authenticate(MyUser $user) { / ... / } } Add an additional type-check: class AuthSystem { public function authenticate(User $user) { if ($user instanceof MyUser) { $this->logger->info(/* ... /); } // or alternatively if ( ! $user instanceof MyUser) { throw new \LogicException( '$user must be an instance of MyUser, ' .'other instances are not supported.' ); } } } Note:* PHP Analyzer uses reverse abstract interpretation to narrow down the types inside the if block in such a case. Add the method to the interface: interface User { /** @return string / public function getPassword(); /* @return string */ public function getDisplayName(); } Loading history...
261
262	4		$value = null;
263	4		if (isset($item[$associationMapping['fieldName']]) && !is_object($item[$associationMapping['fieldName']])) {
264	1		$value = $this->objectManager->getReference($associationMapping['targetEntity'], $item[$associationMapping['fieldName']]);
			0 ignored issues – show Bug introduced 2017-01-27 12:03 UTC by Report Bug Copy Issue Report It seems like you code against a concrete implementation and not the interface `Doctrine\Common\Persistence\ObjectManager` as the method `getReference()` does only exist in the following implementations of said interface: `Doctrine\ODM\MongoDB\DocumentManager`, `Doctrine\ORM\Decorator\EntityManagerDecorator`, `Doctrine\ORM\EntityManager`. Let’s take a look at an example: interface User { /** @return string / public function getPassword(); } class MyUser implements User { public function getPassword() { // return something } public function getDisplayName() { // return some name. } } class AuthSystem { public function authenticate(User $user) { $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName())); // do something. } } In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break. Available Fixes Change the type-hint for the parameter: class AuthSystem { public function authenticate(MyUser $user) { / ... / } } Add an additional type-check: class AuthSystem { public function authenticate(User $user) { if ($user instanceof MyUser) { $this->logger->info(/* ... /); } // or alternatively if ( ! $user instanceof MyUser) { throw new \LogicException( '$user must be an instance of MyUser, ' .'other instances are not supported.' ); } } } Note:* PHP Analyzer uses reverse abstract interpretation to narrow down the types inside the if block in such a case. Add the method to the interface: interface User { /** @return string / public function getPassword(); /* @return string */ public function getDisplayName(); } Loading history...
265	1		}
266
267	4		if (null === $value) {
268	4		continue;
269			}
270
271			$setter = 'set' . ucfirst($associationMapping['fieldName']);
272			$this->setValue($object, $value, $setter);
273	4		}
274	4		}
275
276			/**
277			* Truncate the database table for this writer
278			*/
279	1		protected function truncateTable()
280			{
281	1		if ($this->objectManager instanceof \Doctrine\ORM\EntityManager) {
282			$tableName = $this->objectMetadata->table['name'];
			0 ignored issues – show Bug introduced 2017-01-27 12:03 UTC by Report Bug Copy Issue Report Accessing `table` on the interface `Doctrine\Common\Persistence\Mapping\ClassMetadata` suggest that you code against a concrete implementation. How about adding an `instanceof` check? If you access a property on an interface, you most likely code against a concrete implementation of the interface. Available Fixes Adding an additional type check: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeInterface $object) { if ($object instanceof SomeClass) { $a = $object->a; } } Changing the type hint: interface SomeInterface { } class SomeClass implements SomeInterface { public $a; } function someFunction(SomeClass $object) { $a = $object->a; } Loading history...
283			$connection = $this->objectManager->getConnection();
284			$query = $connection->getDatabasePlatform()->getTruncateTableSQL($tableName, true);
285			$connection->executeQuery($query);
286	1		} elseif ($this->objectManager instanceof \Doctrine\ODM\MongoDB\DocumentManager) {
287	1		$this->objectManager->getDocumentCollection($this->objectName)->remove(array());
288	1		}
289	1		}
290
291			/**
292			* Disable Doctrine logging
293			*/
294	1	View Code Duplication	protected function disableLogging()
			0 ignored issues – show Duplication introduced 2017-08-30 08:20 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
295			{
296			//TODO: do we need to add support for MongoDB logging?
297	1		if (!($this->objectManager instanceof \Doctrine\ORM\EntityManager)) return;
298
299			$config = $this->objectManager->getConnection()->getConfiguration();
300			$this->originalLogger = $config->getSQLLogger();
301			$config->setSQLLogger(null);
302			}
303
304			/**
305			* Re-enable Doctrine logging
306			*/
307	1	View Code Duplication	protected function reEnableLogging()
			0 ignored issues – show Duplication introduced 2017-08-30 08:20 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
308			{
309			//TODO: do we need to add support for MongoDB logging?
310	1		if (!($this->objectManager instanceof \Doctrine\ORM\EntityManager)) return;
311
312	1		$config = $this->objectManager->getConnection()->getConfiguration();
313	1		$config->setSQLLogger($this->originalLogger);
314	1		}
315
316			/**
317			* @param array $item
318			*
319			* @return object
320			*/
321	4		protected function findOrCreateItem(array $item)
322			{
323	4		$object = null;
324			// If the table was not truncated to begin with, find current object
325			// first
326	4		if (!$this->truncate) {
327			if (!empty($this->lookupFields)) {
328			$lookupConditions = array();
329			foreach ($this->lookupFields as $fieldName) {
330			$lookupConditions[$fieldName] = $item[$fieldName];
331			}
332
333			$object = call_user_func($this->lookupMethod, $lookupConditions);
334			} else {
335			$object = $this->objectRepository->find(current($item));
336			}
337			}
338
339	4		if (!$object) {
340	4		return $this->getNewInstance();
341			}
342
343			return $object;
344			}
345
346	6		protected function ensureSupportedObjectManager(ObjectManager $objectManager)
347			{
348			if (!($objectManager instanceof \Doctrine\ORM\EntityManager
349	6		\|\| $objectManager instanceof \Doctrine\ODM\MongoDB\DocumentManager)
350	6		) {
351	1		throw new UnsupportedDatabaseTypeException($objectManager);
352			}
353	5		}
354			}
355

portphp / doctrine

Push — master ( 35cd7c...bbee21 )

DoctrineWriter::loadAssociationObjectsToObject() B

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