Y.A.M の雑記帳: Kotlin Serialization は sealed class も対応していて便利

Kotlin Serialization


plugins {
    ...
    id "org.jetbrains.kotlin.plugin.serialization" version "1.4.31"
}

dependencies {
    ...
    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0"
}


@Serializable
data class Dog(val name: String, val age: Int, val sex: Sex, val kind: Kind)

enum class Sex {
    MALE,
    FEMALE
}

@Serializable
sealed class Kind {

    @Serializable
    object Hybrid : Kind()

    @Serializable
    data class PureBlood(val name: String) : Kind()
}


class DogTest {

    @Test
    fun list() {
        val dogs = listOf(
            Dog("White", 10, Sex.MALE, Kind.Hybrid),
            Dog("Black", 20, Sex.FEMALE, Kind.PureBlood("Husky"))
        )

        val json = Json.encodeToString(dogs)
        println(json)
        // [{"name":"White","age":10,"sex":"MALE","kind":{"type":"net.yanzm.serialize.Kind.Hybrid"}},{"name":"Black","age":20,"sex":"FEMALE","kind":{"type":"net.yanzm.serialize.Kind.PureBlood","name":"Husky"}}]


        val decoded = Json.decodeFromString<List<Dog>>(json)

        assertThat(decoded).isEqualTo(dogs)
    }
}

Y.A.M の雑記帳

2021年3月23日火曜日

Kotlin Serialization は sealed class も対応していて便利

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