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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.internal
import kotlinx.serialization.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
/*
* Descriptor used for explicitly serializable enums by the plugin.
* Designed to be consistent with `EnumSerializer.descriptor` and weird plugin usage.
*/
@Suppress("unused") // Used by the plugin
@PublishedApi
@OptIn(ExperimentalSerializationApi::class)
internal class EnumDescriptor(
name: String,
elementsCount: Int
) : PluginGeneratedSerialDescriptor(name, elementsCount = elementsCount) {
override val kind: SerialKind = SerialKind.ENUM
private val elementDescriptors by lazy {
Array(elementsCount) { buildSerialDescriptor(name + "." + getElementName(it), StructureKind.OBJECT) }
}
override fun getElementDescriptor(index: Int): SerialDescriptor = elementDescriptors.getChecked(index)
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (other == null) return false
if (other !is SerialDescriptor) return false
if (other.kind !== SerialKind.ENUM) return false
if (serialName != other.serialName) return false
if (cachedSerialNames() != other.cachedSerialNames()) return false
return true
}
override fun toString(): String {
return elementNames.joinToString(", ", "$serialName(", ")")
}
override fun hashCode(): Int {
var result = serialName.hashCode()
val elementsHashCode = elementNames.elementsHashCodeBy { it }
result = 31 * result + elementsHashCode
return result
}
}
// Used for enums that are not explicitly serializable by the plugin
@PublishedApi
@OptIn(ExperimentalSerializationApi::class)
internal class EnumSerializer<T : Enum<T>>(
serialName: String,
private val values: Array<T>
) : KSerializer<T> {
override val descriptor: SerialDescriptor = buildSerialDescriptor(serialName, SerialKind.ENUM) {
values.forEach {
val fqn = "$serialName.${it.name}"
val enumMemberDescriptor = buildSerialDescriptor(fqn, StructureKind.OBJECT)
element(it.name, enumMemberDescriptor)
}
}
override fun serialize(encoder: Encoder, value: T) {
val index = values.indexOf(value)
if (index == -1) {
throw SerializationException(
"$value is not a valid enum ${descriptor.serialName}, " +
"must be one of ${values.contentToString()}"
)
}
encoder.encodeEnum(descriptor, index)
}
override fun deserialize(decoder: Decoder): T {
val index = decoder.decodeEnum(descriptor)
if (index !in values.indices) {
throw SerializationException(
"$index is not among valid ${descriptor.serialName} enum values, " +
"values size is ${values.size}"
)
}
return values[index]
}
override fun toString(): String = "kotlinx.serialization.internal.EnumSerializer<${descriptor.serialName}>"
}
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