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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.json
import kotlinx.serialization.*
import kotlinx.serialization.builtins.*
import kotlin.test.*
class JsonTransformingSerializerTest : JsonTestBase() {
val json = Json { encodeDefaults = false }
@Serializable
data class Example(
val name: String,
@Serializable(UnwrappingJsonListSerializer::class) val data: StringData,
@SerialName("more_data") @Serializable(WrappingJsonListSerializer::class) val moreData: List<StringData> = emptyList()
)
object WrappingJsonListSerializer :
JsonTransformingSerializer<List<StringData>>(ListSerializer(StringData.serializer())) {
override fun transformDeserialize(element: JsonElement): JsonElement =
if (element !is JsonArray) JsonArray(listOf(element)) else element
}
object UnwrappingJsonListSerializer :
JsonTransformingSerializer<StringData>(StringData.serializer()) {
override fun transformDeserialize(element: JsonElement): JsonElement {
if (element !is JsonArray) return element
require(element.size == 1) { "Array size must be equal to 1 to unwrap it" }
return element.first()
}
}
object DroppingNameSerializer : JsonTransformingSerializer<Example>(Example.serializer()) {
override fun transformSerialize(element: JsonElement): JsonElement =
JsonObject(element.jsonObject.filterNot { (k, v) -> k == "name" && v.jsonPrimitive.content == "First" })
}
@Test
fun testExampleCanBeParsed() = parametrizedTest { streaming ->
val testDataInput = listOf(
"""{"name":"test","data":{"data":"str1"},"more_data":[{"data":"str2"}]}""",
"""{"name":"test","data":{"data":"str1"},"more_data":{"data":"str2"}}""",
"""{"name":"test","data":[{"data":"str1"}],"more_data":[{"data":"str2"}]}""",
"""{"name":"test","data":[{"data":"str1"}],"more_data":{"data":"str2"}}"""
)
val goldenVal = Example("test", StringData("str1"), listOf(StringData("str2")))
for (i in testDataInput.indices) {
assertEquals(
goldenVal,
json.decodeFromString(Example.serializer(), testDataInput[i], streaming),
"failed test on ${testDataInput[i]}, jsonTestingMode = $streaming"
)
}
}
@Test
fun testExampleDroppingNameSerializer() = parametrizedTest { streaming ->
val testDataInput = listOf(
Example("First", StringData("str1")),
Example("Second", StringData("str1"))
)
val goldenVals = listOf(
"""{"data":{"data":"str1"}}""",
"""{"name":"Second","data":{"data":"str1"}}"""
)
for (i in testDataInput.indices) {
assertEquals(
goldenVals[i],
json.encodeToString(DroppingNameSerializer, testDataInput[i], streaming),
"failed test on ${testDataInput[i]}, jsonTestingMode = $streaming"
)
}
}
@Serializable
data class DocExample(
@Serializable(DocJsonListSerializer::class) val data: String
)
object DocJsonListSerializer :
JsonTransformingSerializer<String>(serializer()) {
override fun transformDeserialize(element: JsonElement): JsonElement {
if (element !is JsonArray) return element
require(element.size == 1) { "Array size must be equal to 1 to unwrap it" }
return element.first()
}
}
@Test
fun testDocumentationSample() = parametrizedTest { streaming ->
val correctExample = DocExample("str1")
assertEquals(correctExample, json.decodeFromString(DocExample.serializer(), """{"data":["str1"]}""", streaming))
assertEquals(correctExample, json.decodeFromString(DocExample.serializer(), """{"data":"str1"}""", streaming))
}
}
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