Fork of Emberwalker's Forgelin with some sprinkles on top.
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package net.shadowfacts.forgelin
import net.minecraftforge.common.MinecraftForge
import net.minecraftforge.fml.common.Loader
import net.minecraftforge.fml.common.LoaderException
import net.minecraftforge.fml.common.Mod
import net.minecraftforge.fml.common.ModContainer
import net.minecraftforge.fml.common.discovery.ASMDataTable
import net.minecraftforge.fml.common.discovery.ASMDataTable.ASMData
import net.minecraftforge.fml.common.discovery.asm.ModAnnotation.EnumHolder
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent
import net.minecraftforge.fml.relauncher.Side
import org.apache.logging.log4j.LogManager
import java.lang.reflect.Modifier
import java.util.EnumSet
import kotlin.reflect.full.companionObjectInstance
object ForgelinAutomaticEventSubscriber {
private val DEFAULT_SUBSCRIPTION_SIDES = EnumSet.allOf(Side::class.java)
private val LOGGER = LogManager.getLogger(ForgelinAutomaticEventSubscriber::class.java)
private val unregistered = mutableSetOf<Class<*>>()
private val registered = mutableSetOf<Any>()
fun subscribeAutomatic(mod: ModContainer, asm: ASMDataTable, currentSide: Side) {
val modAnnotations = asm.getAnnotationsFor(mod) ?: return
val containedMods = modAnnotations.get(Mod::class.java.name)
val subscribers = modAnnotations.get(Mod.EventBusSubscriber::class.java.name)
.filter { parseTargetSides(it).contains(currentSide) }
val loader = Loader.instance().modClassLoader
for (containedMod in containedMods) {
val containedModId = containedMod.annotationInfo["modid"] as String
if (containedMod.annotationInfo["modLanguageAdapter"] != KotlinAdapter::class.qualifiedName) {
LOGGER.debug("Skipping @EventBusSubscriber injection for {} since it does not use KotlinAdapter", containedModId)
continue
}
LOGGER.debug("Attempting to register Kotlin @EventBusSubscriber objects for {}", containedModId)
for (subscriber in subscribers) {
try {
val ownerModId = parseModId(containedMods, subscriber)
if (ownerModId.isNullOrEmpty()) {
LOGGER.debug("Could not determine owning mod for @EventBusSubscriber on {} for mod {}", subscriber.className, mod.modId)
continue
}
if (containedModId != ownerModId) {
LOGGER.debug("Skipping @EventBusSubscriber injection for {} since it is not for mod {}", subscriber.className, containedModId)
continue
}
val subscriberClass = Class.forName(subscriber.className, false, loader) ?: continue
val kotlinClass = subscriberClass.kotlin
val objectInstance = kotlinClass.objectInstance ?: kotlinClass.companionObjectInstance ?: continue
if (!hasStaticEventHandlers(subscriberClass) && subscriberClass !in unregistered) {
MinecraftForge.EVENT_BUS.unregister(subscriberClass)
unregistered += subscriberClass
LOGGER.debug("Unregistered static @EventBusSubscriber class {}", subscriber.className)
}
if (hasObjectEventHandlers(objectInstance) && objectInstance !in registered) {
MinecraftForge.EVENT_BUS.register(objectInstance)
registered += objectInstance
LOGGER.debug("Registered @EventBusSubscriber object instance {}", subscriber.className)
}
} catch (e: Throwable) {
LOGGER.error("An error occurred trying to load an @EventBusSubscriber object {} for modid {}", mod.modId, e)
throw LoaderException(e)
}
}
}
}
private fun hasObjectEventHandlers(objectInstance: Any): Boolean {
return objectInstance.javaClass.methods.any {
!Modifier.isStatic(it.modifiers) && it.isAnnotationPresent(SubscribeEvent::class.java)
}
}
private fun hasStaticEventHandlers(clazz: Class<*>): Boolean {
return clazz.methods.any {
Modifier.isStatic(it.modifiers) && it.isAnnotationPresent(SubscribeEvent::class.java)
}
}
private fun parseModId(containedMods: MutableSet<ASMData>, subscriber: ASMData): String? {
val parsedModId: String? = subscriber.annotationInfo["modid"] as? String
if (parsedModId.isNullOrEmpty()) {
return parsedModId
}
return ASMDataTable.getOwnerModID(containedMods, subscriber)
}
private fun parseTargetSides(subscriber: ASMData): EnumSet<Side> {
val parsedSides: List<EnumHolder>? = subscriber.annotationInfo["value"] as? List<EnumHolder>
if (parsedSides != null) {
val targetSides = EnumSet.noneOf(Side::class.java)
for (parsed in parsedSides) {
targetSides.add(Side.valueOf(parsed.value))
}
return targetSides
}
return DEFAULT_SUBSCRIPTION_SIDES
}
}