Add missing methods to StripedColoredDecorativeBlock

src/main/kotlin/ru/dbotthepony/mc/otm/registry/objects/StripedColoredDecorativeBlock.kt

@@ -25,9 +25,37 @@ class StripedColoredDecorativeBlock(
 	private val mapItems = EnumMap<DyeColor, EnumMap<DyeColor, RegistryObject<Item>>>(DyeColor::class.java)
 
 	fun getBlockNullable(base: DyeColor, stripe: DyeColor): Block? {
+		if (!registeredBlocks) {
+			throw IllegalStateException("Not yet registered blocks")
+		}
+
 		return mapBlocks.get(base)?.get(stripe)?.get()
 	}
 
+	fun getItemNullable(base: DyeColor, stripe: DyeColor): Item? {
+		if (!registeredItems) {
+			throw IllegalStateException("Not yet registered items")
+		}
+
+		return mapItems.get(base)?.get(stripe)?.get()
+	}
+
+	fun getBlock(base: DyeColor, stripe: DyeColor): Block {
+		if (!registeredBlocks) {
+			throw IllegalStateException("Not yet registered blocks")
+		}
+
+		return mapBlocks.get(base)?.get(stripe)?.get() ?: throw NoSuchElementException("$base colored $stripe striped block does not exist")
+	}
+
+	fun getItem(base: DyeColor, stripe: DyeColor): Item {
+		if (!registeredItems) {
+			throw IllegalStateException("Not yet registered items")
+		}
+
+		return mapItems.get(base)?.get(stripe)?.get() ?: throw NoSuchElementException("$base colored $stripe striped item does not exist")
+	}
+
 	var registeredItems = false
 		private set
 
@@ -88,7 +116,7 @@ class StripedColoredDecorativeBlock(
 
 	val mappedItems: Map<DyeColor, Map<DyeColor, Item>> by lazy {
 		if (!registeredItems) {
-			throw IllegalStateException("Not yet registered blocks")
+			throw IllegalStateException("Not yet registered items")
 		}
 
 		val builder = ImmutableMap.Builder<DyeColor, Map<DyeColor, Item>>()