| 1 | <?php  | 
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| 19 | final class Activity extends StatementObject  | 
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| 20 | { | 
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| 21 | private $id;  | 
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| 22 | private $definition;  | 
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| 23 | |||
| 24 | public function __construct(IRI $id, Definition $definition = null)  | 
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| 29 | |||
| 30 | /**  | 
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| 31 | * Returns the Activity's unique identifier.  | 
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| 32 | */  | 
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| 33 | public function getId(): IRI  | 
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| 37 | |||
| 38 | 13 | /**  | 
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| 39 | 13 |      * Returns the Activity's {@link Definition}. | 
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| 40 | 13 | */  | 
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| 41 | public function getDefinition(): ?Definition  | 
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| 45 | |||
| 46 | /**  | 
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| 47 | 1 |      * {@inheritdoc} | 
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| 48 | */  | 
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| 49 | 1 | public function equals(StatementObject $object): bool  | 
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| 73 | }  | 
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| 74 | 
Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: