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package moe.nea.firmament.util.compatloader
import java.util.ServiceLoader
import net.fabricmc.loader.api.FabricLoader
import kotlin.reflect.KClass
import kotlin.streams.asSequence
import moe.nea.firmament.Firmament
abstract class CompatLoader<T : Any>(val kClass: Class<T>) {
constructor(kClass: KClass<T>) : this(kClass.java)
val loader: ServiceLoader<T> = ServiceLoader.load(kClass)
val allValidInstances by lazy {
loader.reload()
loader.stream()
.asSequence()
.filter { provider ->
runCatching {
shouldLoad(provider.type())
}.getOrElse {
Firmament.logger.error("Could not determine whether to load a ${kClass.name} subclass", it)
false
}
}
.mapNotNull { provider ->
runCatching {
provider.get()
}.getOrElse {
Firmament.logger.error(
"Could not load desired instance ${provider.type().name} for ${kClass.name}",
it)
null
}
}
.toList()
}
val singleInstance by lazy { allValidInstances.singleOrNull() }
open fun shouldLoad(type: Class<out T>): Boolean {
return checkRequiredModsPresent(type)
}
fun checkRequiredModsPresent(type: Class<*>): Boolean {
val requiredMods = type.getAnnotationsByType(RequireMod::class.java)
return requiredMods.all { FabricLoader.getInstance().isModLoaded(it.modId) }
}
@Repeatable
annotation class RequireMod(val modId: String)
}
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