44 lines
1.8 KiB
Kotlin
44 lines
1.8 KiB
Kotlin
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@file:Suppress("UNCHECKED_CAST")
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package center.sciprog.attributes
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import kotlinx.serialization.KSerializer
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import kotlinx.serialization.descriptors.SerialDescriptor
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import kotlinx.serialization.encoding.Decoder
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import kotlinx.serialization.encoding.Encoder
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import kotlinx.serialization.json.Json
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import kotlinx.serialization.json.JsonObject
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import kotlinx.serialization.json.buildJsonObject
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public class AttributesSerializer(
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private val serializableAttributes: Set<SerializableAttribute<*>>,
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) : KSerializer<Attributes> {
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private val jsonSerializer = JsonObject.serializer()
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override val descriptor: SerialDescriptor get() = jsonSerializer.descriptor
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override fun deserialize(decoder: Decoder): Attributes {
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val jsonElement = jsonSerializer.deserialize(decoder)
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val attributeMap: Map<SerializableAttribute<*>, Any> = jsonElement.entries.associate { (key, element) ->
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val attr = serializableAttributes.find { it.serialId == key }
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?: error("Attribute serializer for key $key not found")
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val value = Json.decodeFromJsonElement(attr.serializer, element) ?: error("Null values are not allowed")
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attr to value
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}
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return Attributes(attributeMap)
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}
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override fun serialize(encoder: Encoder, value: Attributes) {
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val json = buildJsonObject {
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value.content.forEach { (key, value) ->
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if (key !in serializableAttributes) error("An attribute key $key is not in the list of allowed attributes for this serializer")
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val serializableKey = key as SerializableAttribute
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put(
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serializableKey.serialId,
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Json.encodeToJsonElement(serializableKey.serializer as KSerializer<Any>, value)
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)
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}
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}
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jsonSerializer.serialize(encoder, json)
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}
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}
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