private BigDecimal calculateDiscount() {
List<Discount> discounts = order.getDiscounts();
BigDecimal totalDiscount = BigDecimal.ZERO;
for (Discount discount : discounts) {
BigDecimal totalCostForDiscountedItems =
new BigDecimal(discount.getNumberOfBooks()).multiply(FakeDatabase.COST_OF_ONE_BOOK);
BigDecimal discountPercent =
new FakeDatabase().getDiscountForNumberOfUniqueBooks(discount.getNumberOfBooks());
BigDecimal discountAmount = discountPercent.multiply(totalCostForDiscountedItems);
totalDiscount = totalDiscount.add(discountAmount);
}
return totalDiscount;
}
// 测试PurchaseList类
@Test
public void test_purchaselist() {
PurchaseList list = new PurchaseList();
Discount dis = Discount.Initial();
dis.ClearDiscount();
list.AddPurchaseListItem("ITEM000001");
list.AddPurchaseListItem("ITEM000001");
list.AddPurchaseListItem("ITEM000001");
list.AddPurchaseListItem("ITEM000002-2");
list.AddPurchaseListItem("ITEM000005-3");
list.ParsePurchaseList();
Map<String, PurchaseItem> returnlist = list.getPurchaseList();
PurchaseItem item = returnlist.get("ITEM000001");
assertTrue(item.getIteminfo().getName().equals("篮球"));
assertEquals(item.getItemnum(), 3);
assertEquals(item.getRealprice(), 294, 0.1);
assertEquals(item.getDiscountprice(), 0, 0.1);
assertEquals(returnlist.get("ITEM000005").getItemnum(), 3);
}
// 测试Discount的添加折扣商品函数
@Test
public void AddDiscountItem_and_AddGiveItem() {
Discount dis = Discount.Initial();
dis.ClearDiscount();
dis.AddDiscountItem("ITEM000001");
dis.AddDiscountItem("ITEM000002");
dis.AddGiveItem("ITEM000001");
dis.AddGiveItem("ITEM000003");
PromotionType type1 = dis.IsPromotion("ITEM000001");
assertEquals(type1, PromotionType.BUYTWOGIVEONE);
PromotionType type2 = dis.IsPromotion("ITEM000002");
assertEquals(type2, PromotionType.DISCOUNT);
PromotionType type3 = dis.IsPromotion("ITEM000003");
assertEquals(type3, PromotionType.BUYTWOGIVEONE);
PromotionType type4 = dis.IsPromotion("ITEM000005");
assertEquals(type4, PromotionType.NOPROMOTION);
}
public Stream<CompletableFuture<String>> findPriceStream(String product) {
return shops
.stream()
.map(shop -> CompletableFuture.supplyAsync(() -> shop.getPrice(product), executor))
.map(future -> future.thenApply(Quote::parse))
.map(
future ->
future.thenCompose(
quote ->
CompletableFuture.supplyAsync(
() -> Discount.applyDiscount(quote), executor)));
}
@Test
public void should_calculate_price_CalculatePrice() {
Discount dis = Discount.Initial();
dis.ClearDiscount();
dis.AddGiveItem("ITEM000001");
dis.AddDiscountItem("ITEM000005");
PurchaseList list = new PurchaseList();
list.AddPurchaseListItem("ITEM000001");
list.AddPurchaseListItem("ITEM000001");
list.AddPurchaseListItem("ITEM000001");
list.AddPurchaseListItem("ITEM000002-2");
list.AddPurchaseListItem("ITEM000005-3");
list.ParsePurchaseList();
Map<String, PurchaseItem> returnlist = list.getPurchaseList();
PurchaseItem item1 = returnlist.get("ITEM000001");
assertEquals(item1.getDiscountprice(), 98, 0.1);
assertEquals(item1.getRealprice(), 294, 0.1);
PurchaseItem item2 = returnlist.get("ITEM000002");
assertEquals(item2.getDiscountprice(), 0, 0.1);
assertEquals(item2.getRealprice(), 2, 0.1);
PurchaseItem item3 = returnlist.get("ITEM000005");
assertEquals(item3.getRealprice(), 9, 0.1);
assertEquals(item3.getDiscountprice(), 0.45, 0.1);
}
public void removeDiscount(Discount discount) {
discounts.remove(discount);
if (discount.getCoupon() == this) {
discount.setCoupon(null);
}
}
public void addDiscount(Discount discount) {
discounts.add(discount);
if (discount.getCoupon() != this) {
discount.setCoupon(this);
}
}