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SerializerByTypeTest.kt
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SerializerByTypeTest.kt
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/*
* Copyright 2017-2021 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.builtins.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlinx.serialization.json.*
import kotlinx.serialization.modules.*
import kotlinx.serialization.test.*
import org.junit.Test
import java.lang.reflect.*
import kotlin.reflect.*
import kotlin.test.*
import kotlin.time.*
class SerializerByTypeTest {
private val json = Json
@Serializable
data class Box<out T>(val a: T)
@Serializable
data class Data(val l: List<String>, val b: Box<Int>)
@Serializable
data class WithCustomDefault(val n: Int) {
@Serializer(forClass = WithCustomDefault::class)
companion object {
override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("WithCustomDefault", PrimitiveKind.INT)
override fun serialize(encoder: Encoder, value: WithCustomDefault) = encoder.encodeInt(value.n)
override fun deserialize(decoder: Decoder) = WithCustomDefault(decoder.decodeInt())
}
}
object IntBoxToken : ParameterizedType {
override fun getRawType() = Box::class.java
override fun getOwnerType() = null
override fun getActualTypeArguments(): Array<Type> = arrayOf(Int::class.java)
}
@Serializable
object SerializableObject
@Serializable
data class WithNamedCompanion(val a: Int) {
companion object Named
}
@Test
fun testGenericParameter() {
val b = Box(42)
assertSerializedWithType(IntBoxToken, """{"a":42}""", b)
}
@Test
fun testNestedGenericParameter() {
val b = Box(Box(239))
assertSerializedWithType(typeTokenOf<Box<Box<Int>>>(), """{"a":{"a":239}}""", b)
}
@Test
fun testArray() {
val myArr = arrayOf("a", "b", "c")
val token = myArr::class.java
assertSerializedWithType(token, """["a","b","c"]""", myArr)
}
@Test
fun testList() {
val myArr = listOf("a", "b", "c")
val token = object : ParameterizedType {
override fun getRawType(): Type = List::class.java
override fun getOwnerType(): Type? = null
override fun getActualTypeArguments(): Array<Type> = arrayOf(String::class.java)
}
assertSerializedWithType(token, """["a","b","c"]""", myArr)
}
@Test
fun testListAsCollection() {
val myArr: Collection<String> = listOf("a", "b", "c")
val token = object : ParameterizedType {
override fun getRawType(): Type = Collection::class.java
override fun getOwnerType(): Type? = null
override fun getActualTypeArguments(): Array<Type> = arrayOf(String::class.java)
}
assertSerializedWithType(token, """["a","b","c"]""", myArr)
}
@Test
fun testReifiedArrayResolving() {
val myArr = arrayOf("a", "b", "c")
val token = typeTokenOf<Array<String>>()
assertSerializedWithType(token, """["a","b","c"]""", myArr)
}
@Test
fun testPrimitiveArrayResolving() {
val myArr = intArrayOf(1, 2, 3)
val token = IntArray::class.java
val name = serializer(token).descriptor.serialName
assertTrue(name.contains("IntArray"))
assertSerializedWithType(token, """[1,2,3]""", myArr)
}
@Test
fun testReifiedListResolving() {
val myList = listOf("a", "b", "c")
val token = typeTokenOf<List<String>>()
assertSerializedWithType(token, """["a","b","c"]""", myList)
}
@Test
fun testReifiedSetResolving() {
val mySet = setOf("a", "b", "c", "c")
val token = typeTokenOf<Set<String>>()
assertSerializedWithType(token, """["a","b","c"]""", mySet)
}
@Test
fun testReifiedMapResolving() {
val myMap = mapOf("a" to Data(listOf("c"), Box(6)))
val token = typeTokenOf<Map<String, Data>>()
assertSerializedWithType(token, """{"a":{"l":["c"],"b":{"a":6}}}""",myMap)
}
@Test
fun testNestedListResolving() {
val myList = listOf(listOf(listOf(1, 2, 3)), listOf())
val token = typeTokenOf<List<List<List<Int>>>>()
assertSerializedWithType(token, "[[[1,2,3]],[]]", myList)
}
@Test
fun testNestedArrayResolving() {
val myList = arrayOf(arrayOf(arrayOf(1, 2, 3)), arrayOf())
val token = typeTokenOf<Array<Array<Array<Int>>>>()
assertSerializedWithType(token, "[[[1,2,3]],[]]", myList)
}
@Test
fun testNestedMixedResolving() {
val myList = arrayOf(listOf(arrayOf(1, 2, 3)), listOf())
val token = typeTokenOf<Array<List<Array<Int>>>>()
assertSerializedWithType(token, "[[[1,2,3]],[]]", myList)
}
@Test
fun testPair() {
val myPair = "42" to 42
val token = typeTokenOf<Pair<String, Int>>()
assertSerializedWithType(token, """{"first":"42","second":42}""", myPair)
}
@Test
fun testTriple() {
val myTriple = Triple("1", 2, Box(42))
val token = typeTokenOf<Triple<String, Int, Box<Int>>>()
assertSerializedWithType(token, """{"first":"1","second":2,"third":{"a":42}}""", myTriple)
}
@Test
fun testGenericInHolder() {
val b = Data(listOf("a", "b", "c"), Box(42))
assertSerializedWithType(Data::class.java,"""{"l":["a","b","c"],"b":{"a":42}}""", b )
}
@Test
fun testOverriddenSerializer() {
val foo = json.decodeFromString<WithCustomDefault>("9")
assertEquals(9, foo.n)
}
@Test
fun testNamedCompanion() {
val namedCompanion = WithNamedCompanion(1)
assertSerializedWithType(WithNamedCompanion::class.java, """{"a":1}""", namedCompanion)
}
@Test
fun testPrimitive() {
val token = typeTokenOf<Int>()
val serial = serializer(token)
assertSame(Int.serializer() as KSerializer<*>, serial)
}
@Test
fun testObject() {
val token = typeTokenOf<SerializableObject>()
val serial = serializer(token)
assertEquals(SerializableObject.serializer().descriptor, serial.descriptor)
}
@Suppress("UNCHECKED_CAST")
private fun <T> assertSerializedWithType(
token: Type,
expected: String,
value: T,
) {
val serial = serializer(token) as KSerializer<T>
assertEquals(expected, json.encodeToString(serial, value))
val serial2 = requireNotNull(serializerOrNull(token)) { "Expected serializer to be found" }
assertEquals(expected, json.encodeToString(serial2 as KSerializer<T>, value))
}
@PublishedApi
internal open class TypeBase<T>
public inline fun <reified T> typeTokenOf(): Type {
val base = object : TypeBase<T>() {}
val superType = base::class.java.genericSuperclass!!
return (superType as ParameterizedType).actualTypeArguments.first()!!
}
class IntBox(val i: Int)
object CustomIntSerializer : KSerializer<IntBox> {
override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("CIS", PrimitiveKind.INT)
override fun serialize(encoder: Encoder, value: IntBox) {
encoder.encodeInt(42)
}
override fun deserialize(decoder: Decoder): IntBox {
TODO()
}
}
@Test
fun testContextualLookup() {
val module = SerializersModule { contextual(CustomIntSerializer) }
val serializer = module.serializer(typeTokenOf<List<List<IntBox>>>())
assertEquals("[[42]]", Json.encodeToString(serializer, listOf(listOf(IntBox(1)))))
}
@Test
fun testCompiledWinsOverContextual() {
val contextual = object : KSerializer<Int> {
override val descriptor: SerialDescriptor = Int.serializer().descriptor
override fun serialize(encoder: Encoder, value: Int) {
fail()
}
override fun deserialize(decoder: Decoder): Int {
fail()
}
}
val module = SerializersModule { contextual(contextual) }
val serializer = module.serializer(typeTokenOf<List<List<Int>>>())
assertEquals("[[1]]", Json.encodeToString(serializer, listOf(listOf<Int>(1))))
assertEquals("42", Json.encodeToString(module.serializer(typeTokenOf<Int>()), 42))
}
class NonSerializable
class NonSerializableBox<T>(val boxed: T)
@Test
fun testLookupFail() {
assertNull(serializerOrNull(typeTokenOf<NonSerializable>()))
assertNull(serializerOrNull(typeTokenOf<NonSerializableBox<String>>()))
assertNull(serializerOrNull(typeTokenOf<Box<NonSerializable>>()))
assertFailsWithMessage<SerializationException>("for class 'NonSerializable'") {
serializer(typeTokenOf<NonSerializable>())
}
assertFailsWithMessage<SerializationException>("for class 'NonSerializableBox'") {
serializer(typeTokenOf<NonSerializableBox<String>>())
}
assertFailsWithMessage<SerializationException>("for class 'NonSerializable'") {
serializer(typeTokenOf<kotlinx.serialization.Box<NonSerializable>>())
}
assertFailsWithMessage<SerializationException>("for class 'NonSerializable'") {
serializer(typeTokenOf<Array<NonSerializable>>())
}
}
@OptIn(ExperimentalTime::class)
@Test
@Ignore // TODO: Unignore after 1.8.0 update
fun testSerializersAreIntrinsified() {
val direct = measureTime {
Json.encodeToString(IntData.serializer(), IntData(10))
}
val directMs = direct.inWholeMicroseconds
val indirect = measureTime {
Json.encodeToString(IntData(10))
}
val indirectMs = indirect.inWholeMicroseconds
if (indirectMs > directMs + (directMs / 4)) error("Direct ($directMs) and indirect ($indirectMs) times are too far apart")
}
}