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/*
* Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
@file:UseSerializers(NullableIntSerializer::class, NonNullableIntSerializer::class)
package kotlinx.serialization
import kotlinx.serialization.SerializationForNullableTypeOnFileTest.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlinx.serialization.json.*
import kotlin.test.*
class SerializationForNullableTypeOnFileTest {
@Serializable
data class Holder(val nullable: Int?, val nonNullable: Int)
object NullableIntSerializer : KSerializer<Int?> {
override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("NullableIntSerializer", PrimitiveKind.INT).nullable
override fun serialize(encoder: Encoder, value: Int?) {
if (value == null) encoder.encodeNull()
else encoder.encodeInt(value + 1)
}
override fun deserialize(decoder: Decoder): Int? {
return if (decoder.decodeNotNullMark()) {
val value = decoder.decodeInt()
value - 1
} else {
decoder.decodeNull()
}
}
}
object NonNullableIntSerializer : KSerializer<Int> {
override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("NotNullIntSerializer", PrimitiveKind.INT)
override fun serialize(encoder: Encoder, value: Int) {
return encoder.encodeInt(value + 2)
}
override fun deserialize(decoder: Decoder): Int {
return (decoder.decodeInt() - 2)
}
}
@Test
fun testFileLevel() {
assertEquals("""{"nullable":null,"nonNullable":52}""", Json.encodeToString(Holder(nullable = null, nonNullable = 50)))
assertEquals("""{"nullable":1,"nonNullable":2}""", Json.encodeToString(Holder(nullable = 0, nonNullable = 0)))
assertEquals("""{"nullable":11,"nonNullable":52}""", Json.encodeToString(Holder(nullable = 10, nonNullable = 50)))
assertEquals(Holder(nullable = 0, nonNullable = 50), Json.decodeFromString("""{"nullable":1,"nonNullable":52}"""))
assertEquals(Holder(nullable = null, nonNullable = 50), Json.decodeFromString("""{"nullable":null,"nonNullable":52}"""))
assertEquals(Holder(nullable = 10, nonNullable = 50), Json.decodeFromString("""{"nullable":11,"nonNullable":52}"""))
}
}
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