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<?php |
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/** |
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* (c) Tomasz Kunicki <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Domain\Category\UseCase\ListCategory; |
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use Domain\Category\Entity\CategoryInterface; |
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use Domain\Category\Repository\CategoryRepositoryInterface; |
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use Domain\Common\UseCase\ResponderAwareInterface; |
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use Domain\Common\UseCase\ResponderAwareTrait; |
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/** |
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* Class ListCategoryUseCase |
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* |
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* @package Domain\Category\UseCase\ListCategory |
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*/ |
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class ListCategoryUseCase implements ResponderAwareInterface |
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{ |
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use ResponderAwareTrait; |
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/** @var CategoryRepositoryInterface */ |
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private $categoryRepository; |
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/** |
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* ListCategoryUseCase constructor. |
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* |
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* @param CategoryRepositoryInterface $categoryRepository |
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*/ |
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public function __construct(CategoryRepositoryInterface $categoryRepository) |
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{ |
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$this->categoryRepository = $categoryRepository; |
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} |
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/** |
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* |
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*/ |
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public function execute() |
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{ |
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$categories = $this->categoryRepository->findAll(); |
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$items = $this->fetchCategoriesItems($categories); |
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$this->listFetched($items); |
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} |
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/** |
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* @param $categories |
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* @return CategoryListItem[] |
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*/ |
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private function fetchCategoriesItems($categories) |
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{ |
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$list = []; |
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/** @var CategoryInterface $category */ |
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foreach ($categories as $category) { |
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$list[] = new CategoryListItem($category->getId(), $category->getName()); |
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} |
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return $list; |
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} |
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/** |
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* @param $items |
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*/ |
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private function listFetched($items) |
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{ |
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/** @var ListCategoryResponderInterface $responder */ |
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foreach ($this->responders as $responder) { |
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$responder->listFetched(new ListCategoryResponse($items)); |
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} |
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} |
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} |
Let’s take a look at an example:
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:
Add an additional type-check:
Add the method to the interface: