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Merge pull request #271 from iruizmar/serialize_sealed_classes
Serialize sealed classes
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7 changes: 7 additions & 0 deletions
7
firebase-common/src/commonMain/kotlin/dev/gitlive/firebase/FirebaseClassDiscriminator.kt
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package dev.gitlive.firebase | ||
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import kotlinx.serialization.InheritableSerialInfo | ||
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@InheritableSerialInfo | ||
@Target(AnnotationTarget.CLASS) | ||
annotation class FirebaseClassDiscriminator(val discriminator: String) |
59 changes: 59 additions & 0 deletions
59
firebase-common/src/commonMain/kotlin/dev/gitlive/firebase/Polymorphic.kt
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package dev.gitlive.firebase | ||
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import kotlinx.serialization.DeserializationStrategy | ||
import kotlinx.serialization.SerializationStrategy | ||
import kotlinx.serialization.descriptors.SerialDescriptor | ||
import kotlinx.serialization.findPolymorphicSerializer | ||
import kotlinx.serialization.internal.AbstractPolymorphicSerializer | ||
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/* | ||
* This code was inspired on polymorphic json serialization of kotlinx.serialization. | ||
* See https://github.com/Kotlin/kotlinx.serialization/blob/master/formats/json/commonMain/src/kotlinx/serialization/json/internal/Polymorphic.kt | ||
*/ | ||
@Suppress("UNCHECKED_CAST") | ||
internal fun <T> FirebaseEncoder.encodePolymorphically( | ||
serializer: SerializationStrategy<T>, | ||
value: T, | ||
ifPolymorphic: (String) -> Unit | ||
) { | ||
if (serializer !is AbstractPolymorphicSerializer<*>) { | ||
serializer.serialize(this, value) | ||
return | ||
} | ||
val casted = serializer as AbstractPolymorphicSerializer<Any> | ||
val baseClassDiscriminator = serializer.descriptor.classDiscriminator() | ||
val actualSerializer = casted.findPolymorphicSerializer(this, value as Any) | ||
ifPolymorphic(baseClassDiscriminator) | ||
actualSerializer.serialize(this, value) | ||
} | ||
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@Suppress("UNCHECKED_CAST") | ||
internal fun <T> FirebaseDecoder.decodeSerializableValuePolymorphic( | ||
value: Any?, | ||
decodeDouble: (value: Any?) -> Double?, | ||
deserializer: DeserializationStrategy<T>, | ||
): T { | ||
if (deserializer !is AbstractPolymorphicSerializer<*>) { | ||
return deserializer.deserialize(this) | ||
} | ||
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val casted = deserializer as AbstractPolymorphicSerializer<Any> | ||
val discriminator = deserializer.descriptor.classDiscriminator() | ||
val type = getPolymorphicType(value, discriminator) | ||
val actualDeserializer = casted.findPolymorphicSerializerOrNull( | ||
structureDecoder(deserializer.descriptor, decodeDouble), | ||
type | ||
) as DeserializationStrategy<T> | ||
return actualDeserializer.deserialize(this) | ||
} | ||
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internal fun SerialDescriptor.classDiscriminator(): String { | ||
// Plain loop is faster than allocation of Sequence or ArrayList | ||
// We can rely on the fact that only one FirebaseClassDiscriminator is present — | ||
// compiler plugin checked that. | ||
for (annotation in annotations) { | ||
if (annotation is FirebaseClassDiscriminator) return annotation.discriminator | ||
} | ||
return "type" | ||
} | ||
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