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.Overview Handler
[plantuml, file="uml-handler.png"]
----
interface IHandler {
    handle()
    canHandle()
    doHandle()
}
abstract class AbstractHandler {
    successor:IHandler
    handle()
    canHandle()
    doHandle()
}
IHandler <|-- AbstractHandler
AbstractHandler <|-- ListHandler
AbstractHandler <|-- MemberHandler
AbstractHandler <|-- ServiceHandler
AbstractHandler <|-- DefaultHandler
AbstractHandler <|-- LayoutHandler
AbstractHandler <|-- ObjectListHandler
AbstractHandler <|-- ActionHandler

class core.Dispatcher {
    delegate:IHandler 
}
core.Dispatcher --> ServiceHandler : delegate
ServiceHandler --> ActionHandler : successor
ActionHandler --> MemberHandler : successor
MemberHandler -->  ListHandler : successor
ListHandler -->  ObjectListHandler : successor
ObjectListHandler -->  LayoutHandler : successor
LayoutHandler -->  DefaultHandler : successor
----