@@ -0,0 +1,150 @@
+package store.domain;
+
+import static store.enums.ErrorMessage.INVALID_PURCHASE;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import store.domain.vo.ProductName;
+import store.dto.OrderConfirmDto;
+
+public class OrderInfo {
+
+    private static final String OPEN_BRACKET = "[";
+    private static final String CLOSE_BRACKET = "]";
+    private static final String SEPARATOR = "-";
+
+    private static final int MIN_LENGTH = 5;
+    private static final int BRACKET_OFFSET = 1;
+    private static final int NAME_IDX = 0;
+    private static final int QUANTITY_IDX = 1;
+    private static final int SPLIT_LENGTH = 2;
+    private static final int ZERO = 0;
+
+    private final ProductName productName;
+    private final long requestQuantity;
+
+    public OrderInfo(ProductName productName, long requestQuantity) {
+        this.productName = productName;
+        this.requestQuantity = requestQuantity;
+    }
+
+    public static OrderInfo of(ProductName productName, long requestQuantity) {
+        return new OrderInfo(productName, requestQuantity);
+    }
+
+    public static OrderInfo create(String input) {
+        validInput(input);
+        String[] parsedInput = parseNameAndQuantity(input);
+        return new OrderInfo(ProductName.create(parsedInput[NAME_IDX]), parseQuantity(parsedInput[QUANTITY_IDX]));
+    }
+
+    protected static Map<ProductName, Long> sumQuantityByProduct(List<OrderInfo> orderInfos) {
+        Map<ProductName, Long> purchaseCountMap = new LinkedHashMap<>();
+
+        orderInfos.forEach(
+                orderInfo -> purchaseCountMap.merge(orderInfo.productName, orderInfo.requestQuantity,
+                        Long::sum));
+
+        return purchaseCountMap;
+    }
+
+    private static void validInput(String input) {
+        if (input == null || input.isBlank() || input.length() < MIN_LENGTH) {
+            throw new IllegalArgumentException(INVALID_PURCHASE.getMessage());
+        }
+
+        boolean startsWith = input.startsWith(OPEN_BRACKET);
+        boolean endsWith = input.endsWith(CLOSE_BRACKET);
+        if ((!startsWith || !endsWith) && input.contains(SEPARATOR)) {
+            throw new IllegalArgumentException(INVALID_PURCHASE.getMessage());
+        }
+    }
+
+    private static String[] parseNameAndQuantity(String input) {
+        String trimInput = trimBrackets(input);
+        validTrimInput(trimInput);
+        String[] splitInput = trimInput.split(SEPARATOR);
+        validSplitInput(splitInput);
+
+        return splitInput;
+    }
+
+    private static void validTrimInput(String trimInput) {
+        boolean startsWith = trimInput.startsWith(SEPARATOR);
+        boolean endsWith = trimInput.endsWith(SEPARATOR);
+
+        if (startsWith || endsWith) {
+            throw new IllegalArgumentException(INVALID_PURCHASE.getMessage());
+        }
+    }
+
+    private static String trimBrackets(String input) {
+        int endIdx = input.length() - BRACKET_OFFSET;
+
+        return input.substring(BRACKET_OFFSET, endIdx);
+    }
+
+    private static long parseQuantity(String number) {
+        try {
+            long parseNumber = Long.parseLong(number);
+            validQuantity(parseNumber);
+            return parseNumber;
+        } catch (NumberFormatException e) {
+            throw new IllegalArgumentException(INVALID_PURCHASE.getMessage());
+        }
+    }
+
+    private static void validQuantity(long number) {
+        if (number <= ZERO) {
+            throw new IllegalArgumentException(INVALID_PURCHASE.getMessage());
+        }
+    }
+
+    private static void validSplitInput(String[] splitInput) {
+        if (splitInput.length != SPLIT_LENGTH) {
+            throw new IllegalArgumentException(INVALID_PURCHASE.getMessage());
+        }
+
+        if (splitInput[NAME_IDX].isBlank() || splitInput[QUANTITY_IDX].isBlank()) {
+            throw new IllegalArgumentException(INVALID_PURCHASE.getMessage());
+        }
+    }
+
+    public OrderConfirmDto toConfirmDto(Product product) {
+        long requireQuantity = product.calculateRequiredQuantity(requestQuantity);
+
+        return OrderConfirmDto.create(productName, requestQuantity, requireQuantity);
+    }
+
+    public void validQuantity(Product product) {
+        product.validStock(requestQuantity);
+    }
+
+    public String toOriginalInput() {
+        return OPEN_BRACKET + productName + SEPARATOR + requestQuantity + CLOSE_BRACKET;
+    }
+
+    public ProductName getProductName() {
+        return productName;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        OrderInfo that = (OrderInfo) o;
+        return Objects.equals(productName, that.productName) && Objects.equals(requestQuantity,
+                that.requestQuantity);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productName, requestQuantity);
+    }
+}

리뷰: 도메인에 DTO 변환 로직이 직접 포함되는거는 부적절해 보입니다