Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
1 | <?php namespace Modules\Translation\Repositories\Cache; |
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7 | class CacheTranslationDecorator extends BaseCacheDecorator implements TranslationRepository |
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8 | { |
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9 | public function __construct(TranslationRepository $recipe) |
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15 | |||
16 | /** |
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17 | * @param string $key |
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18 | * @param string $locale |
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19 | * @return string |
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20 | */ |
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21 | public function findByKeyAndLocale($key, $locale = null) |
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31 | |||
32 | View Code Duplication | public function allFormatted() |
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42 | |||
43 | public function saveTranslationForLocaleAndKey($locale, $key, $value) |
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49 | |||
50 | View Code Duplication | public function findTranslationByKey($key) |
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60 | |||
61 | /** |
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62 | * Update the given translation key with the given data |
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63 | * @param string $key |
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64 | * @param array $data |
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65 | * @return mixed |
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66 | */ |
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67 | public function updateFromImport($key, array $data) |
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73 | |||
74 | /** |
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75 | * Set the given value on the given TranslationTranslation |
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76 | * @param TranslationTranslation $translationTranslation |
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77 | * @param string $value |
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78 | * @return void |
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79 | */ |
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80 | public function updateTranslationToValue(TranslationTranslation $translationTranslation, $value) |
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86 | } |
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87 |
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: