code: public BoxSharedLink getSharedLink() {
          return mBodyMap.containsKey(BoxItem.FIELD_SHARED_LINK) ?
                  ((BoxSharedLink) mBodyMap.get(BoxItem.FIELD_SHARED_LINK)) :
                  null;
      }
docs: Returns the shared link currently set for the item.
  
  @return  shared link for the item, or null if not set.