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1 | <?php |
2 | declare( strict_types=1 ); |
3 | |
4 | /** |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
18 | * http://www.gnu.org/copyleft/gpl.html |
19 | * |
20 | * @file |
21 | */ |
22 | |
23 | namespace Wikimedia\JsonCodec; |
24 | |
25 | /** |
26 | * Classes implementing this interface support round-trip JSON |
27 | * serialization/deserialization for certain class types. |
28 | * They may maintain state and/or consult service objects which |
29 | * are stored in the codec object. |
30 | * |
31 | * |
32 | * @template T |
33 | */ |
34 | interface JsonClassCodec { |
35 | |
36 | /** |
37 | * Returns a JSON array representing the contents of the given object, that |
38 | * can be deserialized with the corresponding newFromJsonArray() method. |
39 | * |
40 | * The returned array can contain other JsonCodecables as values; |
41 | * the JsonCodec class will take care of encoding values in the array |
42 | * as needed, as well as annotating the returned array with the class |
43 | * information needed to locate the correct ::newFromJsonArray() |
44 | * method during deserialization. |
45 | * |
46 | * Only objects of the types registered to this JsonClassCodec will be |
47 | * provided to this method. |
48 | * |
49 | * @param T $obj An object of the type handled by this JsonClassCodec |
50 | * @return array A Json representation of the object. |
51 | */ |
52 | public function toJsonArray( $obj ): array; |
53 | |
54 | /** |
55 | * Creates a new instance of the given class and initializes it from the |
56 | * $json array. |
57 | * @param class-string<T> $className |
58 | * @param array $json |
59 | * @return T |
60 | */ |
61 | public function newFromJsonArray( string $className, array $json ); |
62 | |
63 | /** |
64 | * Return an optional type hint for the given array key in the result of |
65 | * ::toJsonArray() / input to ::newFromJsonArray. If a class name is |
66 | * returned here and it matches the runtime type of the value of that |
67 | * array key, then type information will be omitted from the generated |
68 | * JSON which can save space. The class name can be suffixed with `[]` |
69 | * to indicate an array or list containing objects of the given class |
70 | * name. |
71 | * |
72 | * @param class-string<T> $className The class we're looking for a hint for |
73 | * @param string $keyName The name of the array key we'd like a hint on |
74 | * @return class-string|string|Hint|null A class string, Hint or null. |
75 | * For backward compatibility, a class string suffixed with `[]` can |
76 | * also be returned, but that is deprecated. |
77 | */ |
78 | public function jsonClassHintFor( string $className, string $keyName ); |
79 | } |