code: protected synchronized void setFrozen(boolean frozen) {
  
          if (frozen && !m_frozen) {
              // "freeze" the job configuration
              m_parameters = Collections.unmodifiableSortedMap(m_parameters);
              m_context.freeze();
              m_frozen = true;
          } else if (!frozen && m_frozen) {
              // "unfreeze" the job configuration
              m_parameters = new TreeMap<String, String>(m_parameters);
              m_frozen = false;
          }
      }
docs: Sets the "frozen" state of this job.<p>
  
  This is an internal operation to be used only by the <code>{@link CmsScheduleManager}</code>.<p>
  
  @param frozen the "frozen" state to set