RTC how to get the value of a Enumeration of a https://jazz.net/forum/questions/ask/workitem?

Hi

I need to do a validation programmatically.

I created a class that extend from AbstractService and Implements IOperationAdvisor.

this class its going to be triggered in a work save action of a workitem.

but i dont know how to get the value of a enumeration in the work item.

i got the work item  from:

IWorkItem work=(IWorkItem)((ISaveParameter)operation.getData()).getNewState();

and I can get the customAttributes from:

work.getCustomAttributes()

but i dont know how to used it to identify the enumeration and get the value of the attribute