Port Round 1 to Java (OrderDomain): 7 tests green, START state preserved

2026-10-01 13:35:33 +01:00
parent d9f78162e7
commit 83e1c79ab7
5 changed files with 264 additions and 0 deletions
@@ -0,0 +1,46 @@
+package orderdomain;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Order {
+
+    private final List<OrderLine> lines = new ArrayList<>();
+
+    private boolean completed;
+
+    public List<OrderLine> getLines() {
+        return lines;
+    }
+
+    public BigDecimal getTotal() {
+        BigDecimal total = BigDecimal.ZERO;
+        for (OrderLine line : lines) {
+            total = total.add(line.getValue());
+        }
+        return total;
+    }
+
+    public boolean isCompleted() {
+        return completed;
+    }
+
+    public void addLine(BigDecimal unitPrice, int quantity) {
+        lines.add(new OrderLine(unitPrice, quantity));
+    }
+
+    public void applyDiscount(int lineIndex) {
+        lines.get(lineIndex).applyDiscount();
+    }
+
+    public void complete() {
+        completed = true;
+    }
+
+    // C# decimal == is numeric (scale-insensitive); BigDecimal.equals is
+    // scale-sensitive, so compare numerically with compareTo.
+    public boolean isFullyPaid(BigDecimal expectedTotal) {
+        return completed && getTotal().compareTo(expectedTotal) == 0;
+    }
+}
@@ -0,0 +1,36 @@
+package orderdomain;
+
+import java.math.BigDecimal;
+
+public class OrderLine {
+
+    private final BigDecimal unitPrice;
+    private final int quantity;
+    private boolean hasDiscount;
+
+    public OrderLine(BigDecimal unitPrice, int quantity) {
+        this.unitPrice = unitPrice;
+        this.quantity = quantity;
+    }
+
+    public BigDecimal getUnitPrice() {
+        return unitPrice;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public boolean hasDiscount() {
+        return hasDiscount;
+    }
+
+    public BigDecimal getValue() {
+        BigDecimal value = unitPrice.multiply(BigDecimal.valueOf(quantity));
+        return hasDiscount ? value.multiply(new BigDecimal("0.8")) : value;
+    }
+
+    public void applyDiscount() {
+        hasDiscount = true;
+    }
+}