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package kotlinx.serialization.json
import kotlinx.serialization.*
import kotlinx.serialization.Serializable
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlinx.serialization.test.assertFailsWithMessage
import kotlin.test.*
@Serializable(with = LargeStringSerializer::class)
data class LargeStringData(val largeString: String)
@Serializable
data class ClassWithLargeStringDataField(val largeStringField: LargeStringData)
object LargeStringSerializer : KSerializer<LargeStringData> {
override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("LargeStringContent", PrimitiveKind.STRING)
override fun deserialize(decoder: Decoder): LargeStringData {
require(decoder is ChunkedDecoder) { "Only chunked decoder supported" }
val outStringBuilder = StringBuilder()
decoder.decodeStringChunked { chunk ->
outStringBuilder.append(chunk)
}
return LargeStringData(outStringBuilder.toString())
}
override fun serialize(encoder: Encoder, value: LargeStringData) {
encoder.encodeString(value.largeString)
}
}
open class JsonChunkedStringDecoderTest : JsonTestBase() {
@Test
fun decodePlainLenientString() {
val longString = "abcd".repeat(8192) // Make string more than 16k
val sourceObject = ClassWithLargeStringDataField(LargeStringData(longString))
val serializedObject = "{\"largeStringField\": $longString }"
val jsonWithLenientMode = Json { isLenient = true }
testDecodeInAllModes(jsonWithLenientMode, serializedObject, sourceObject)
}
@Test
fun decodePlainString() {
val longStringWithEscape = "${"abcd".repeat(4096)}\"${"abcd".repeat(4096)}" // Make string more than 16k
val sourceObject = ClassWithLargeStringDataField(LargeStringData(longStringWithEscape))
val serializedObject = Json.encodeToString(sourceObject)
testDecodeInAllModes(Json, serializedObject, sourceObject)
}
private fun testDecodeInAllModes(
seralizer: Json, serializedObject: String, sourceObject: ClassWithLargeStringDataField
) {
/* Filter out Java Streams mode in common tests. Java streams tested separately in java tests */
JsonTestingMode.values().filterNot { it == JsonTestingMode.JAVA_STREAMS }.forEach { mode ->
if (mode == JsonTestingMode.TREE) {
assertFailsWithMessage<IllegalArgumentException>(
"Only chunked decoder supported", "Shouldn't decode JSON in TREE mode"
) {
seralizer.decodeFromString<ClassWithLargeStringDataField>(serializedObject, mode)
}
} else {
val deserializedObject =
seralizer.decodeFromString<ClassWithLargeStringDataField>(serializedObject, mode)
assertEquals(sourceObject.largeStringField, deserializedObject.largeStringField)
}
}
}
}
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