Fix: Optional serializer

Author: emyfops

common/src/main/kotlin/com/lambda/Lambda.kt

@@ -10,7 +10,6 @@ import com.lambda.core.Loader
 import com.lambda.gui.impl.clickgui.windows.tag.CustomModuleWindow
 import com.lambda.gui.impl.clickgui.windows.tag.TagWindow
 import com.lambda.module.tag.ModuleTag
-import com.lambda.threading.runGameScheduled
 import com.lambda.util.KeyCode
 import com.mojang.authlib.GameProfile
 import com.mojang.blaze3d.systems.RenderSystem.recordRenderCall
@@ -20,6 +19,7 @@ import net.minecraft.util.math.BlockPos
 import org.apache.logging.log4j.LogManager
 import org.apache.logging.log4j.Logger
 import java.awt.Color
+import java.util.*
 
 object Lambda {
     const val MOD_NAME = "Lambda"
@@ -40,6 +40,7 @@ object Lambda {
         .registerTypeAdapter(BlockPos::class.java, BlockPosSerializer)
         .registerTypeAdapter(Block::class.java, BlockSerializer)
         .registerTypeAdapter(GameProfile::class.java, GameProfileSerializer)
+        .registerTypeAdapter(Optional::class.java, OptionalSerializer)
         .create()
 
     fun initialize() {

common/src/main/kotlin/com/lambda/config/serializer/OptionalSerializer.kt

@@ -0,0 +1,17 @@
+package com.lambda.config.serializer
+
+import com.google.gson.*
+import java.lang.reflect.Type
+import java.util.*
+
+object OptionalSerializer : JsonSerializer<Optional<Any>>, JsonDeserializer<Optional<Any>> {
+    override fun serialize(src: Optional<Any>?, typeOfSrc: Type?, context: JsonSerializationContext?): JsonElement =
+        src?.map { context?.serialize(it) }?.orElse(JsonNull.INSTANCE) ?: JsonNull.INSTANCE
+
+    override fun deserialize(
+        json: JsonElement?,
+        typeOfT: Type?,
+        context: JsonDeserializationContext?
+    ): Optional<Any> =
+        Optional.ofNullable(json?.let { context?.deserialize(it, typeOfT) ?: Optional.empty<Any>() })
+}