| 1 | <?php |
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| 21 | abstract class AbstractStringContainerBlock extends AbstractBlock implements StringContainerInterface |
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| 22 | { |
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| 23 | /** |
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| 24 | * @var ArrayCollection|string[] |
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| 25 | */ |
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| 26 | protected $strings; |
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| 27 | |||
| 28 | /** |
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| 29 | * @var string |
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| 30 | */ |
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| 31 | protected $finalStringContents = ''; |
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| 32 | |||
| 33 | /** |
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| 34 | * Constructor |
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| 35 | */ |
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| 36 | 2040 | public function __construct() |
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| 40 | |||
| 41 | /** |
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| 42 | * @param string $line |
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| 43 | */ |
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| 44 | 2019 | public function addLine(string $line) |
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| 48 | |||
| 49 | /** |
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| 50 | * @param ContextInterface $context |
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| 51 | * @param Cursor $cursor |
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| 52 | */ |
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| 53 | public function handleRemainingContents(ContextInterface $context, Cursor $cursor) |
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| 61 | |||
| 62 | 1992 | public function getStringContent(): string |
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| 66 | } |
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| 67 |
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 sub-classes 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 parent class: