code: public List<List<String>> getFilteredPolicy(int fieldIndex, String... fieldValues) {
          return getFilteredNamedPolicy("p", fieldIndex, fieldValues);
      }
docs: getFilteredPolicy gets all the authorization rules in the policy, field filters can be specified.
  
  @param fieldIndex the policy rule's start index to be matched.
  @param fieldValues the field values to be matched, value ""
  means not to match this field.
  @return the filtered "p" policy rules.