@startuml
hide footbox
[-> "an Order": calculatePrice
activate "an Order"
"an Order" -> "an Order Line": getQuantity
activate "an Order Line"
deactivate "an Order Line"
"an Order" -> "an Order Line": getProduct
activate "an Order Line"
"an Order" <-- "an Order Line" : aProduct
deactivate "an Order Line"
"an Order" -> aProduct: getPricingDetails
activate aProduct
deactivate aProduct
@enduml