blob: 7da16fb8388334ab394b297bbb8f76beacf3a4cb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
package kotlinx.serialization.features
import kotlin.test.*
import kotlinx.serialization.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlinx.serialization.json.*
import kotlinx.serialization.modules.*
class DerivedContextualSerializerTest {
@Serializable
abstract class Message
@Serializable
class SimpleMessage(val body: String) : Message()
@Serializable
class Holder(@Contextual val message: Message)
object MessageAsStringSerializer : KSerializer<Message> {
override val descriptor: SerialDescriptor =
PrimitiveSerialDescriptor("kotlinx.serialization.MessageAsStringSerializer", PrimitiveKind.STRING)
override fun serialize(encoder: Encoder, value: Message) {
// dummy serializer that assumes Message is always SimpleMessage
check(value is SimpleMessage)
encoder.encodeString(value.body)
}
override fun deserialize(decoder: Decoder): Message {
return SimpleMessage(decoder.decodeString())
}
}
@Test
fun testDerivedContextualSerializer() {
val module = SerializersModule {
contextual(MessageAsStringSerializer)
}
val format = Json { serializersModule = module }
val data = Holder(SimpleMessage("hello"))
val serialized = format.encodeToString(data)
assertEquals("""{"message":"hello"}""", serialized)
val deserialized = format.decodeFromString<Holder>(serialized)
assertTrue(deserialized.message is SimpleMessage)
assertEquals("hello", deserialized.message.body)
}
}
|
