code: public static String quoteValues(Collection<String> values) {
          StringBuilder sb = new StringBuilder();
  
          boolean first = true;
          for (String s : values) {
              if (!first)
                  sb.append(",");
              first = false;
              sb.append(quoteValue(s));
          }
  
          return sb.toString();
      }
docs: Quotes and escapes a list of values so that they can be used in a SimpleDB query.
  
  @param values
  The collection of attribute values that will be quoted, escaped, and included in
  the returned string list.
  @return A string representation of the list of specified values, with individual values
  properly quoted and escaped.