code: public String getRules(boolean fullrules) {
          if (!fullrules) {
              return tailoring.getRules();
          }
          return CollationLoader.getRootRules() + tailoring.getRules();
      }
docs: Returns current rules.
  The argument defines whether full rules (root collation + tailored) rules are returned
  or just the tailoring.
  
  <p>The root collation rules are an <i>approximation</i> of the root collator's sort order.
  They are almost never used or useful at runtime and can be removed from the data.
  See <a href="http://userguide.icu-project.org/collation/customization#TOC-Building-on-Existing-Locales">User Guide:
  Collation Customization, Building on Existing Locales</a>
  
  <p>{@link #getRules()} should normally be used instead.
  @param fullrules
  true if the rules that defines the full set of collation order is required, otherwise false for
  returning only the tailored rules
  @return the current rules that defines this Collator.
  @see #getRules()