xref: /aosp_15_r20/external/kotlinx.serialization/guide/example/example-formats-12.kt (revision 57b5a4a64c534cf7f27ac9427ceab07f3d8ed3d8)
1 // This file was automatically generated from formats.md by Knit tool. Do not edit.
2 package example.exampleFormats12
3 
4 import kotlinx.serialization.*
5 import kotlinx.serialization.descriptors.*
6 import kotlinx.serialization.encoding.*
7 import kotlinx.serialization.modules.*
8 
9 class ListEncoder : AbstractEncoder() {
10     val list = mutableListOf<Any>()
11 
12     override val serializersModule: SerializersModule = EmptySerializersModule()
13 
encodeValuenull14     override fun encodeValue(value: Any) {
15         list.add(value)
16     }
17 }
18 
encodeToListnull19 fun <T> encodeToList(serializer: SerializationStrategy<T>, value: T): List<Any> {
20     val encoder = ListEncoder()
21     encoder.encodeSerializableValue(serializer, value)
22     return encoder.list
23 }
24 
encodeToListnull25 inline fun <reified T> encodeToList(value: T) = encodeToList(serializer(), value)
26 
27 class ListDecoder(val list: ArrayDeque<Any>) : AbstractDecoder() {
28     private var elementIndex = 0
29 
30     override val serializersModule: SerializersModule = EmptySerializersModule()
31 
32     override fun decodeValue(): Any = list.removeFirst()
33 
34     override fun decodeElementIndex(descriptor: SerialDescriptor): Int {
35         if (elementIndex == descriptor.elementsCount) return CompositeDecoder.DECODE_DONE
36         return elementIndex++
37     }
38 
39     override fun beginStructure(descriptor: SerialDescriptor): CompositeDecoder =
40         ListDecoder(list)
41 
42     override fun decodeSequentially(): Boolean = true
43 }
44 
decodeFromListnull45 fun <T> decodeFromList(list: List<Any>, deserializer: DeserializationStrategy<T>): T {
46     val decoder = ListDecoder(ArrayDeque(list))
47     return decoder.decodeSerializableValue(deserializer)
48 }
49 
decodeFromListnull50 inline fun <reified T> decodeFromList(list: List<Any>): T = decodeFromList(list, serializer())
51 
52 @Serializable
53 data class Project(val name: String, val owner: User, val votes: Int)
54 
55 @Serializable
56 data class User(val name: String)
57 
58 fun main() {
59     val data = Project("kotlinx.serialization",  User("kotlin"), 9000)
60     val list = encodeToList(data)
61     println(list)
62     val obj = decodeFromList<Project>(list)
63     println(obj)
64 }
65