Initial stab at API structuring (#1711)

src/main/java/wayoftime/bloodmagic/api/item/IBindable.java

@@ -0,0 +1,40 @@
+package wayoftime.bloodmagic.api.item;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import wayoftime.bloodmagic.core.data.Binding;
+
+/**
+ * Implement this interface on any Item that can be bound to a player.
+ */
+public interface IBindable
+{
+	/**
+	 * Gets an object that stores who this item is bound to.
+	 * <p>
+	 * If the item is not bound, this will be null.
+	 *
+	 * @param stack - The owned ItemStack
+	 * @return - The binding object
+	 */
+	@Nullable
+	default Binding getBinding(ItemStack stack)
+	{
+		Binding binding = Binding.fromStack(stack);
+		return !stack.isEmpty() && binding != null ? binding : null;
+	}
+
+	/**
+	 * Called when the player attempts to bind the item.
+	 *
+	 * @param player - The Player attempting to bind the item
+	 * @param stack  - The ItemStack to attempt binding
+	 * @return If binding was successful.
+	 */
+	default boolean onBind(PlayerEntity player, ItemStack stack)
+	{
+		return true;
+	}
+}