Cleaner sub-item implementation

Todo: Move more sub items to use it

src/main/java/WayofTime/bloodmagic/item/ItemEnum.java

@@ -0,0 +1,59 @@
+package WayofTime.bloodmagic.item;
+
+import WayofTime.bloodmagic.BloodMagic;
+import WayofTime.bloodmagic.client.IVariantProvider;
+import WayofTime.bloodmagic.item.types.ISubItem;
+import com.google.common.collect.Lists;
+import net.minecraft.creativetab.CreativeTabs;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.NonNullList;
+import net.minecraft.util.math.MathHelper;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
+import org.apache.commons.lang3.tuple.Pair;
+
+import java.util.List;
+
+public class ItemEnum<T extends Enum<T> & ISubItem> extends Item implements IVariantProvider {
+
+    protected final T[] types;
+
+    public ItemEnum(Class<T> enumClass, String baseName) {
+        super();
+
+        this.types = enumClass.getEnumConstants();
+
+        setUnlocalizedName(BloodMagic.MODID + "." + baseName);
+        setHasSubtypes(types.length > 1);
+        setCreativeTab(BloodMagic.TAB_BM);
+    }
+
+    @Override
+    public String getUnlocalizedName(ItemStack stack) {
+        return super.getUnlocalizedName(stack) + "." + getItemType(stack).getInternalName();
+    }
+
+    @Override
+    @SideOnly(Side.CLIENT)
+    public void getSubItems(CreativeTabs tab, NonNullList<ItemStack> subItems) {
+        if (!isInCreativeTab(tab))
+            return;
+
+        for (T type : types)
+            subItems.add(new ItemStack(this, 1, type.ordinal()));
+    }
+
+    public T getItemType(ItemStack stack) {
+        return types[MathHelper.clamp(stack.getItemDamage(), 0, types.length)];
+    }
+
+    @Override
+    public List<Pair<Integer, String>> getVariants() {
+        List<Pair<Integer, String>> variants = Lists.newArrayList();
+        for (int i = 0; i < types.length; i++)
+            variants.add(Pair.of(i, "type=" + types[i].getInternalName()));
+
+        return variants;
+    }
+}