Adds a new check for items with full durability (#4)

src/main/java/net/knarcraft/blacksmith/util/ItemHelper.java

@@ -0,0 +1,43 @@
+package net.knarcraft.blacksmith.util;
+
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.Damageable;
+
+public final class ItemHelper {
+
+    private ItemHelper() {
+
+    }
+
+    /**
+     * Gets the current durability of the given item
+     *
+     * @param itemStack <p>The item to get the durability of</p>
+     * @return <p>The durability of the item</p>
+     */
+    public static short getDurability(ItemStack itemStack) {
+        Damageable damageable = (Damageable) itemStack.getItemMeta();
+        int maxDurability = itemStack.getType().getMaxDurability();
+        if (damageable != null) {
+            return (short) (maxDurability - damageable.getDamage());
+        } else {
+            return (short) maxDurability;
+        }
+    }
+
+    /**
+     * Gets the damage done to the given item
+     *
+     * @param itemStack <p>The damage done to the item</p>
+     * @return <p>The damage done to the item</p>
+     */
+    public static short getDamage(ItemStack itemStack) {
+        Damageable damageable = (Damageable) itemStack.getItemMeta();
+        if (damageable != null) {
+            return (short) damageable.getDamage();
+        } else {
+            return 0;
+        }
+    }
+
+}