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| 1 | <?php |
| 2 | declare( strict_types=1 ); |
| 3 | |
| 4 | /** |
| 5 | * @license GPL-2.0-or-later |
| 6 | * @file |
| 7 | */ |
| 8 | |
| 9 | namespace Wikimedia\JsonCodec; |
| 10 | |
| 11 | /** |
| 12 | * Classes implementing this interface support round-trip JSON |
| 13 | * serialization/deserialization for certain class types. |
| 14 | * They may maintain state and/or consult service objects which |
| 15 | * are stored in the codec object. |
| 16 | * |
| 17 | * @template T |
| 18 | */ |
| 19 | interface JsonClassCodec { |
| 20 | |
| 21 | /** |
| 22 | * Returns a JSON array representing the contents of the given object, that |
| 23 | * can be deserialized with the corresponding newFromJsonArray() method. |
| 24 | * |
| 25 | * The returned array can contain other JsonCodecables as values; |
| 26 | * the JsonCodec class will take care of encoding values in the array |
| 27 | * as needed, as well as annotating the returned array with the class |
| 28 | * information needed to locate the correct ::newFromJsonArray() |
| 29 | * method during deserialization. |
| 30 | * |
| 31 | * Only objects of the types registered to this JsonClassCodec will be |
| 32 | * provided to this method. |
| 33 | * |
| 34 | * @param T $obj An object of the type handled by this JsonClassCodec |
| 35 | * @return array A Json representation of the object. |
| 36 | */ |
| 37 | public function toJsonArray( $obj ): array; |
| 38 | |
| 39 | /** |
| 40 | * Creates a new instance of the given class and initializes it from the |
| 41 | * $json array. |
| 42 | * @param class-string<T> $className |
| 43 | * @param array $json |
| 44 | * @return T |
| 45 | */ |
| 46 | public function newFromJsonArray( string $className, array $json ); |
| 47 | |
| 48 | /** |
| 49 | * Return an optional type hint for the given array key in the result of |
| 50 | * ::toJsonArray() / input to ::newFromJsonArray. If a class name is |
| 51 | * returned here and it matches the runtime type of the value of that |
| 52 | * array key, then type information will be omitted from the generated |
| 53 | * JSON which can save space. The class name can be suffixed with `[]` |
| 54 | * to indicate an array or list containing objects of the given class |
| 55 | * name. |
| 56 | * |
| 57 | * @param class-string<T> $className The class we're looking for a hint for |
| 58 | * @param string $keyName The name of the array key we'd like a hint on |
| 59 | * @return class-string|string|Hint|null A class string, Hint or null. |
| 60 | * For backward compatibility, a class string suffixed with `[]` can |
| 61 | * also be returned, but that is deprecated. |
| 62 | */ |
| 63 | public function jsonClassHintFor( string $className, string $keyName ); |
| 64 | } |