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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
import kotlinx.serialization.internal.*
import kotlinx.serialization.modules.*
import kotlin.reflect.*
/**
* This class provides support for retrieving a serializer in runtime, instead of using the one precompiled by the serialization plugin.
* This serializer is enabled by [ContextualSerialization].
*
* Typical usage of ContextSerializer would be a serialization of a class which does not have
* static serializer (e.g. Java class or class from 3rd party library);
* or desire to override serialized class form in one dedicated output format.
*
* Serializers are being looked for in a [SerialModule] from the target [Encoder] or [Decoder], using statically known [KClass].
* To create a serial module, use [SerializersModule] factory function.
* To pass it to encoder and decoder, refer to particular [SerialFormat]'s documentation.
*/
@OptIn(UnsafeSerializationApi::class)
public class ContextSerializer<T : Any>(
private val serializableClass: KClass<T>,
private val fallbackSerializer: KSerializer<T>?,
private val typeParametersSerializers: Array<KSerializer<*>>
) : KSerializer<T> {
// Used from auto-generated code
public constructor(serializableClass: KClass<T>) : this(serializableClass, null, EMPTY_SERIALIZER_ARRAY)
public override val descriptor: SerialDescriptor =
SerialDescriptor("kotlinx.serialization.ContextSerializer", UnionKind.CONTEXTUAL).withContext(serializableClass)
public override fun serialize(encoder: Encoder, value: T) {
val clz = value::class
val serializer = encoder.serializersModule.getContextual(clz) ?: fallbackSerializer ?: serializableClass.serializerNotRegistered()
@Suppress("UNCHECKED_CAST")
encoder.encodeSerializableValue(serializer as SerializationStrategy<T>, value)
}
public override fun deserialize(decoder: Decoder): T {
val serializer = decoder.serializersModule.getContextual(serializableClass) ?: fallbackSerializer ?: serializableClass.serializerNotRegistered()
return decoder.decodeSerializableValue(serializer)
}
}
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