更优雅的方式来处理Spring中的嵌套REST资源调用？

@RestController
@RequestMapping("/api")
public class UserController {
  
  @Autowired
  private UserService userService;
  
  @GetMapping("/users/{userId}")
  public ResponseEntity<Resource<User>> getUser(@PathVariable Long userId) {
    User user = userService.getUser(userId);
    
    // 创建用户资源
    Resource<User> userResource = new Resource<>(user);
    
    // 添加用户资源的链接
    Link selfLink = linkTo(methodOn(UserController.class).getUser(userId)).withSelfRel();
    userResource.add(selfLink);
    
    // 添加嵌套资源的链接
    Link ordersLink = linkTo(methodOn(UserController.class).getUserOrders(userId)).withRel("orders");
    userResource.add(ordersLink);
    
    return ResponseEntity.ok(userResource);
  }
  
  @GetMapping("/users/{userId}/orders")
  public ResponseEntity<Resources<Resource<Order>>> getUserOrders(@PathVariable Long userId) {
    List<Order> orders = userService.getUserOrders(userId);
    
    // 创建订单资源列表
    List<Resource<Order>> orderResources = new ArrayList<>();
    for (Order order : orders) {
      Resource<Order> orderResource = new Resource<>(order);
      
      // 添加订单资源的链接
      Link selfLink = linkTo(methodOn(UserController.class).getUserOrder(userId, order.getId())).withSelfRel();
      orderResource.add(selfLink);
      
      orderResources.add(orderResource);
    }
    
    // 创建订单资源列表的资源
    Resources<Resource<Order>> orderResourcesList = new Resources<>(orderResources);
    
    return ResponseEntity.ok(orderResourcesList);
  }
  
  @GetMapping("/users/{userId}/orders/{orderId}")
  public ResponseEntity<Resource<Order>> getUserOrder(@PathVariable Long userId, @PathVariable Long orderId) {
    Order order = userService.getUserOrder(userId, orderId);
    
    // 创建订单资源
    Resource<Order> orderResource = new Resource<>(order);
    
    // 添加订单资源的链接
    Link selfLink = linkTo(methodOn(UserController.class).getUserOrder(userId, orderId)).withSelfRel();
    orderResource.add(selfLink);
    
    return ResponseEntity.ok(orderResource);
  }
}