code: public Level getEffectiveLevel()
      {
          int level = m_delegate.getLogLevel();
          if (level == PaxLogger.LEVEL_TRACE) {
              return Level.TRACE;
          }
          if (level == PaxLogger.LEVEL_DEBUG) {
              return Level.DEBUG;
          }
          if (level == PaxLogger.LEVEL_INFO) {
              return Level.INFO;
          }
          if (level == PaxLogger.LEVEL_WARNING) {
              return Level.WARN;
          }
          if (level == PaxLogger.LEVEL_ERROR) {
              return Level.ERROR;
          }
          return null;
      }
docs: Starting from this category, search the category hierarchy for a
  non-null level and return it. Otherwise, return the level of the
  root category.
  
  <p>The Category class is designed so that this method executes as
  quickly as possible.