copi featur classifi param sourc featur copi param classifi classifi copi newli creat featur featur copi featur object sourc object classifi sourc featur classifi classifi illeg argument except sourc sourc classifi classifi featur sourc attribut attribut attr creat attribut copi attribut attribut sourc attr attr sourc oper oper oper creat oper copi oper oper sourc oper todo build paramet oper sourc method method method creat method copi method method sourc method method sourc recept recept recept recept model impl common behavior factori creat recept copi recept recept sourc recept recept illeg argument except sourc sourc set owner classifi classifi classifi classifi featur add 