Is there a way to provide some "context" to a dese...

# serialization

[Matyáš Vítek]

Is there a way to provide some "context" to a deserializer? I'd like to deserialize relative file paths as File

[Piotr Krzemiński]

try a custom serializer: https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#custom-serializers
you need to instantiate File in deserialize method

[Matyáš Vítek]

Well sure I'll have to use that, there is no default serializer for File. But how can I pass the context into that custom serializer

[Piotr Krzemiński]

oh, sorry, I didn't understand your original question then!

[Matyáš Vítek]

no prob

[Matyáš Vítek]

Actually I think I have it

[Matyáš Vítek]

I'll just make the serializer a class, which takes the absolute path as an argument and pass that to the method (using KToml's deserialization from file)

[Matyáš Vítek]

Oh I couldn't because I need a serializer for the type that holds it

[Piotr Krzemiński]

yeah, and kotlinx.serialization instantiates the serializer class, right?

[Matyáš Vítek]

it either automatically takes one or you pass one

[Matyáš Vítek]

but

[Matyáš Vítek]

I have this config class, where the texture field is the one I'm trying to solve

[Matyáš Vítek]

image.png

[Matyáš Vítek]

Yeah, that wouldn't work

[Piotr Krzemiński]

can you make an extra step of serialization? so in the first step you'd deserialize relative paths, and then you'd make the paths absolute using the extra piece of info which is probably some directory path

[Piotr Krzemiński]

maybe it's acceptable to make this name: Component field contain such relative path "for a minute", before returning a fully deserialized object

[Matyáš Vítek]

well I can always just process the paths and map that into a different object or so, but that's what I'm trying to avoid

[Piotr Krzemiński]

so you'd like to access the default value of some field from the serializer's class?

[Piotr Krzemiński]

oh, sorry - you have the absolute path somewhere else

[Matyáš Vítek]

yeah

[Matyáš Vítek]

I'm basically processing files in a folder structure

[Matyáš Vítek]

checking if @Contextual could do what I'm trying to make

[Matyáš Vítek]

seems good so far

[Piotr Krzemiński]

please share a snippet once you have it working

[Matyáš Vítek]

Seems like I'm rather having a problem with KToml now 😄

[Matyáš Vítek]

Time to test it with the same input but in JSON

[Matyáš Vítek]

Yeah, it worked with JSON 😐

[Matyáš Vítek]

Well anyways, first you have the class itself, in my case ItemConfig

[Matyáš Vítek]

Then the serializer, takes the current location and uses that (serialization is unimplemented as I won't use it but it wouldn't be hard to write

[Matyáš Vítek]

And then comes the deserialization itself, you just add it to the serializersModule, as described here

[Matyáš Vítek]

cc @akuleshov7

[Loney Chou]

Could you show us the stacktrace? Where is the exception thrown?

[Matyáš Vítek]

It cannot find a serializer for File, sending the stacktrace asap

[Matyáš Vítek]

kotlinx.serialization.SerializationException: Serializer for class 'File' is not found.
Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied.

	at kotlinx.serialization.internal.Platform_commonKt.serializerNotRegistered(Platform.common.kt:90) ~[?:?]
	at kotlinx.serialization.ContextualSerializer.serializer(ContextualSerializer.kt:51) ~[?:?]
	at kotlinx.serialization.ContextualSerializer.deserialize(ContextualSerializer.kt:67) ~[?:?]
	at kotlinx.serialization.encoding.Decoder$DefaultImpls.decodeSerializableValue(Decoding.kt:257) ~[?:?]
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:16) ~[?:?]
	at com.akuleshov7.ktoml.decoders.TomlAbstractDecoder.decodeSerializableValue(TomlAbstractDecoder.kt:96) ~[?:?]
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43) ~[?:?]
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70) ~[?:?]
	at ResourceCraft.jar/dev.matytyma.resourcecraft.config.ItemConfig$$serializer.deserialize(ItemConfig.kt:11) ~[ResourceCraft.jar:?]
	at ResourceCraft.jar/dev.matytyma.resourcecraft.config.ItemConfig$$serializer.deserialize(ItemConfig.kt:11) ~[ResourceCraft.jar:?]
	at kotlinx.serialization.encoding.Decoder$DefaultImpls.decodeSerializableValue(Decoding.kt:257) ~[?:?]
	at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:16) ~[?:?]
	at com.akuleshov7.ktoml.decoders.TomlAbstractDecoder.decodeSerializableValue(TomlAbstractDecoder.kt:96) ~[?:?]
	at com.akuleshov7.ktoml.decoders.TomlMainDecoder$Companion.decode(TomlMainDecoder.kt:293) ~[?:?]
	at com.akuleshov7.ktoml.Toml.decodeFromString(Toml.kt:93) ~[?:?]
	at com.akuleshov7.ktoml.source.TomlSourceReader.decodeFromSource(TomlSourceReader.kt:43) ~[?:?]
	at com.akuleshov7.ktoml.file.TomlFileReader.decodeFromFile(TomlFileReader.kt:41) ~[?:?]
	
=== Unrelated part of stacktrace ===
	
	at ResourceCraft.jar/dev.matytyma.resourcecraft.ResourceCraft.onEnable(ResourceCraft.kt:45) ~[ResourceCraft.jar:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:288) ~[paper-mojangapi-1.21.1-R0.1-SNAPSHOT.jar:?]
	at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[purpur-1.21.1.jar:1.21.1-2321-2eaea6a]
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[purpur-1.21.1.jar:1.21.1-2321-2eaea6a]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-mojangapi-1.21.1-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:654) ~[purpur-1.21.1.jar:1.21.1-2321-2eaea6a]
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:603) ~[purpur-1.21.1.jar:1.21.1-2321-2eaea6a]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:330) ~[purpur-1.21.1.jar:1.21.1-2321-2eaea6a]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1230) ~[purpur-1.21.1.jar:1.21.1-2321-2eaea6a]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:333) ~[purpur-1.21.1.jar:1.21.1-2321-2eaea6a]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

[Matyáš Vítek]

I guess I'll have to use tomlkt for the project instead...

[Loney Chou]

That's OK. I'm the maintainer of tomlkt. :)