code: public static String quote(Iterable<String> ids) {
          StringBuilder builder = new StringBuilder();
          for (Iterator<String> iterator = ids.iterator(); iterator.hasNext(); ) {
              String id = iterator.next();
              builder.append(quote(id));
              if (iterator.hasNext()) {
                  builder.append(",");
              }
          }
          return builder.toString();
      }
docs: ---- to string ----