use failure over exception throwing

Author: beanbag44

src/main/kotlin/com/lambda/interaction/material/container/containers/CreativeContainer.kt

@@ -49,7 +49,7 @@ data object CreativeContainer : MaterialContainer(Rank.Creative) {
             listen<TickEvent.Pre> {
                 if (!gamemode.isCreative) {
                     // ToDo: Maybe switch gamemode?
-                    throw NotInCreativeModeException()
+                    failure(NotInCreativeModeException())
                 }
 
                 inventoryRequest {
@@ -80,7 +80,7 @@ data object CreativeContainer : MaterialContainer(Rank.Creative) {
 
                     if (!gamemode.isCreative) {
                         // ToDo: Maybe switch gamemode?
-                        throw NotInCreativeModeException()
+                        failure(NotInCreativeModeException())
                     }
 
                     inventoryRequest {
@@ -91,7 +91,7 @@ data object CreativeContainer : MaterialContainer(Rank.Creative) {
                     return@listen
                 }
 
-                throw NoOptimalStackException()
+                failure(IllegalStateException("Cannot move item: no optimal stack"))
             }
         }
     }
@@ -101,5 +101,4 @@ data object CreativeContainer : MaterialContainer(Rank.Creative) {
     override fun withdraw(selection: StackSelection) = CreativeWithdrawal(selection, automated)
 
     class NotInCreativeModeException : IllegalStateException("Insufficient permission: not in creative mode")
-    class NoOptimalStackException : IllegalStateException("Cannot move item: no optimal stack")
 }

src/main/kotlin/com/lambda/interaction/material/container/containers/MainHandContainer.kt

@@ -66,7 +66,11 @@ object MainHandContainer : MaterialContainer(Rank.MainHand) {
                         return@inventoryRequest
                     }
 
-                    val slot = player.currentScreenHandler.slots.firstOrNull { it.stack == moveStack } ?: throw NotInInventoryException()
+                    val slot = player.currentScreenHandler.slots.firstOrNull { it.stack == moveStack }
+                        ?: run {
+                            failure(IllegalStateException("Cannot find stack in inventory"))
+                            return@inventoryRequest
+                        }
                     swap(slot.id, player.inventory.selectedSlot)
 
                     if (hand == Hand.OFF_HAND) swapHands()
@@ -79,6 +83,4 @@ object MainHandContainer : MaterialContainer(Rank.MainHand) {
 
     context(automated: Automated)
     override fun deposit(selection: StackSelection) = HandDeposit(selection, Hand.MAIN_HAND, automated)
-
-    class NotInInventoryException : IllegalStateException("Cannot find stack in inventory")
 }