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<?php |
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namespace Bankiru\Api\Adapters\Sensio; |
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use Bankiru\Api\Doctrine\ApiEntityManager; |
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use Doctrine\Common\Persistence\ManagerRegistry; |
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final class MapperRegistry implements ManagerRegistry |
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{ |
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/** @var ApiEntityManager */ |
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private $manager; |
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/** |
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* MapperRegistry constructor. |
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* |
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* @param ApiEntityManager $manager |
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*/ |
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public function __construct(ApiEntityManager $manager) |
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{ |
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$this->manager = $manager; |
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} |
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/** {@inheritdoc} */ |
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public function getDefaultConnectionName() |
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{ |
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return null; |
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} |
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/** {@inheritdoc} */ |
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public function getConnection($name = null) |
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{ |
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return null; |
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} |
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/** |
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* Gets an array of all registered connections. |
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* |
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* @return array An array of Connection instances. |
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*/ |
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public function getConnections() |
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{ |
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return []; |
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} |
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/** {@inheritdoc} */ |
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public function getConnectionNames() |
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{ |
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return []; |
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} |
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/** {@inheritdoc} */ |
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public function getDefaultManagerName() |
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{ |
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return 'default'; |
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} |
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/** {@inheritdoc} */ |
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public function getManager($name = null) |
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{ |
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if (null === $name || $this->getDefaultManagerName() === $name) { |
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return $this->manager; |
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} |
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throw new \OutOfBoundsException('Invalid API entity manager: ' . $name); |
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} |
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/** {@inheritdoc} */ |
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public function getManagers() |
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{ |
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return [$this->getDefaultManagerName() => $this->manager]; |
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} |
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/** {@inheritdoc} */ |
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public function resetManager($name = null) |
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{ |
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return $this->getManager($name); |
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} |
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/** {@inheritdoc} */ |
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public function getAliasNamespace($alias) |
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{ |
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throw new \OutOfBoundsException('Unable to resolve alias ' . $alias); |
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} |
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/** {@inheritdoc} */ |
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public function getManagerNames() |
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{ |
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return [$this->getDefaultManagerName()]; |
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} |
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/** {@inheritdoc} */ |
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public function getRepository($persistentObject, $persistentManagerName = null) |
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{ |
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return $this->getManager($persistentManagerName)->getRepository($persistentObject); |
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} |
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/** {@inheritdoc} */ |
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public function getManagerForClass($class) |
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{ |
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if (!$this->manager->getMetadataFactory()->isTransient($class)) { |
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return $this->manager; |
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} |
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return null; |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.