I found it
ISelection selection = view.getSite().getSelectionProvider()
.getSelection();
List<Person> personList = new ArrayList<Person>();
if (selection != null && selection instanceof IStructuredSelection) {
IStructuredSelection sel = (IStructuredSelection) selection;
for (Iterator<Person> iterator = sel.iterator(); iterator.hasNext()

{
Person person = (Person) iterator.next();
personList.add(person);
}
}
thanks