From 25a3d52b0ff9732c741e6f78c923a5b49f14c575 Mon Sep 17 00:00:00 2001
From: ai_bot <3+ai_bot@noreply.192.168.12.23>
Date: Mon, 2 Nov 2026 13:14:40 +0800
Subject: [PATCH] feat: add order service

---
 .../java/com/demo/order/OrderService.java     | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 src/main/java/com/demo/order/OrderService.java

diff --git a/src/main/java/com/demo/order/OrderService.java b/src/main/java/com/demo/order/OrderService.java
new file mode 100644
index 0000000..76c4dec
--- /dev/null
+++ b/src/main/java/com/demo/order/OrderService.java
@@ -0,0 +1,24 @@
+package com.demo.order;
+
+import java.math.BigDecimal;
+
+public class OrderService {
+
+    private final OrderRepository repository;
+
+    public OrderService(OrderRepository repository) {
+        this.repository = repository;
+    }
+
+    public BigDecimal total(Order order) {
+        BigDecimal sum = BigDecimal.ZERO;
+        for (OrderLine line : order.getLines()) {
+            sum = sum.add(line.getPrice().multiply(BigDecimal.valueOf(line.getQuantity())));
+        }
+        return sum;
+    }
+
+    public void submit(Order order) {
+        repository.save(order);
+    }
+}