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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 kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlin.test.*
class MapLikeSerializerTest : JsonTestBase() {
@Serializable
data class StringPair(val a: String, val b: String)
@Serializer(forClass = StringPair::class)
object StringPairSerializer : KSerializer<StringPair> {
override val descriptor: SerialDescriptor = buildSerialDescriptor("package.StringPair", StructureKind.MAP) {
element<String>("a")
element<String>("b")
}
override fun serialize(encoder: Encoder, value: StringPair) {
val structuredEncoder = encoder.beginStructure(descriptor)
structuredEncoder.encodeSerializableElement(descriptor, 0, String.serializer(), value.a)
structuredEncoder.encodeSerializableElement(descriptor, 1, String.serializer(), value.b)
structuredEncoder.endStructure(descriptor)
}
override fun deserialize(decoder: Decoder): StringPair {
val composite = decoder.beginStructure(descriptor)
if (composite.decodeSequentially()) {
val key = composite.decodeSerializableElement(descriptor, 0, String.serializer())
val value = composite.decodeSerializableElement(descriptor, 1, String.serializer())
return StringPair(key, value)
}
var key: String? = null
var value: String? = null
mainLoop@ while (true) {
when (val idx = composite.decodeElementIndex(descriptor)) {
CompositeDecoder.DECODE_DONE -> {
break@mainLoop
}
0 -> {
key = composite.decodeSerializableElement(descriptor, 0, String.serializer())
}
1 -> {
value = composite.decodeSerializableElement(descriptor, 1, String.serializer())
}
else -> throw SerializationException("Invalid index: $idx")
}
}
composite.endStructure(descriptor)
if (key == null) throw SerializationException("Element 'a' is missing")
if (value == null) throw SerializationException("Element 'b' is missing")
@Suppress("UNCHECKED_CAST")
return StringPair(key, value)
}
}
@Test
fun testStringPair() = assertJsonFormAndRestored(StringPairSerializer, StringPair("a", "b"), """{"a":"b"}""")
}
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