stackmob - how to parse SMValue to String array -

i getting familiar stackmob server side custom code sdk , trying relationship field , iterate through in form of string array. how do ? possble iterate through without parsing array?

           dataservice ds = serviceprovider.getdataservice();            list<smcondition> query = new arraylist<smcondition>();            query.add(new smequals("product_id", new smstring(jsonobj.getstring("product_id"))));            list<smobject> results = ds.readobjects("product", query);            smobject product= results.get(0);             //product.getvalue().get("categories"); how string array? 

at simplest, this:

list<smvalue> categories = (list<smvalue>)(rawobj.getvalue().get("categories").getvalue()); (smvalue smstring : categories) {     smstring stringvalue = (smstring)smstring.getvalue();     //do whatever want string value here } 

obviously there unchecked casts in here, want add type/null checking appropriate sections depending on data & schema.