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/*
* Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.serialization.features
import kotlinx.serialization.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlinx.serialization.json.*
import kotlinx.serialization.modules.*
import kotlinx.serialization.test.*
import kotlin.test.*
class PolymorphismTest : JsonTestBase() {
@Serializable
data class Wrapper(
@Id(1) @Polymorphic val polyBase1: PolyBase,
@Id(2) @Polymorphic val polyBase2: PolyBase
)
private val module: SerializersModule = BaseAndDerivedModule + SerializersModule {
polymorphic(
PolyDerived::class,
PolyDerived.serializer()
)
}
private val json = Json { useArrayPolymorphism = true; serializersModule = module }
@Test
fun testInheritanceJson() = parametrizedTest { jsonTestingMode ->
val obj = Wrapper(
PolyBase(2),
PolyDerived("b")
)
val bytes = json.encodeToString(Wrapper.serializer(), obj, jsonTestingMode)
assertEquals(
"""{"polyBase1":["kotlinx.serialization.PolyBase",{"id":2}],""" +
""""polyBase2":["kotlinx.serialization.PolyDerived",{"id":1,"s":"b"}]}""", bytes
)
}
@Test
fun testSerializeWithExplicitPolymorphicSerializer() = parametrizedTest { jsonTestingMode ->
val obj = PolyDerived("b")
val s = json.encodeToString(PolymorphicSerializer(PolyDerived::class), obj, jsonTestingMode)
assertEquals("""["kotlinx.serialization.PolyDerived",{"id":1,"s":"b"}]""", s)
}
object PolyDefaultDeserializer : JsonTransformingSerializer<PolyDefault>(PolyDefault.serializer()) {
override fun transformDeserialize(element: JsonElement): JsonElement = buildJsonObject {
put("json", JsonObject(element.jsonObject.filterKeys { it != "type" }))
put("id", 42)
}
}
object EvenDefaultSerializer : SerializationStrategy<PolyBase> {
override val descriptor = buildClassSerialDescriptor("even") {
element<String>("parity")
}
override fun serialize(encoder: Encoder, value: PolyBase) {
encoder.encodeStructure(descriptor) {
encodeStringElement(descriptor, 0, "even")
}
}
}
object OddDefaultSerializer : SerializationStrategy<PolyBase> {
override val descriptor = buildClassSerialDescriptor("odd") {
element<String>("parity")
}
override fun serialize(encoder: Encoder, value: PolyBase) {
encoder.encodeStructure(descriptor) {
encodeStringElement(descriptor, 0, "odd")
}
}
}
@Test
fun testDefaultDeserializer() = parametrizedTest { jsonTestingMode ->
val withDefault = module + SerializersModule {
polymorphicDefaultDeserializer(PolyBase::class) { name ->
if (name == "foo") {
PolyDefaultDeserializer
} else {
null
}
}
}
val adjustedJson = Json { serializersModule = withDefault }
val string = """
{"polyBase1":{"type":"kotlinx.serialization.PolyBase","id":239},
"polyBase2":{"type":"foo","key":42}}""".trimIndent()
val result = adjustedJson.decodeFromString(Wrapper.serializer(), string, jsonTestingMode)
assertEquals(Wrapper(PolyBase(239), PolyDefault(JsonObject(mapOf("key" to JsonPrimitive(42))))), result)
val replaced = string.replace("foo", "bar")
assertFailsWithMessage<SerializationException>("not found") { adjustedJson.decodeFromString(Wrapper.serializer(), replaced, jsonTestingMode) }
}
@Test
fun testDefaultDeserializerForMissingDiscriminator() = parametrizedTest { jsonTestingMode ->
val json = Json {
serializersModule = module + SerializersModule {
polymorphicDefaultDeserializer(PolyBase::class) { name ->
if (name == null) {
PolyDefaultDeserializer
} else {
null
}
}
}
}
val string = """
{"polyBase1":{"type":"kotlinx.serialization.PolyBase","id":239},
"polyBase2":{"key":42}}""".trimIndent()
val result = json.decodeFromString(Wrapper.serializer(), string, jsonTestingMode)
assertEquals(Wrapper(PolyBase(239), PolyDefault(JsonObject(mapOf("key" to JsonPrimitive(42))))), result)
}
@Test
fun testDefaultSerializer() = parametrizedTest { jsonTestingMode ->
val json = Json {
serializersModule = module + SerializersModule {
polymorphicDefaultSerializer(PolyBase::class) { value ->
if (value.id % 2 == 0) {
EvenDefaultSerializer
} else {
OddDefaultSerializer
}
}
}
}
val obj = Wrapper(
PolyDefaultWithId(0),
PolyDefaultWithId(1)
)
val s = json.encodeToString(Wrapper.serializer(), obj, jsonTestingMode)
assertEquals("""{"polyBase1":{"type":"even","parity":"even"},"polyBase2":{"type":"odd","parity":"odd"}}""", s)
}
}
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