repli java util enumer children given object return enumer possibl children tigri gef util child gener gen java lang object enumer gen object carri previou implement sure don want content tfm model facad diagram list re arrai list diagram diagram re add graph model node re add graph model edg collect enumer re model element element associ wai model facad auml element collect enumer model facad model element associ illeg argument except unknown element type 