docs: public static RuleSet getMatcherImpl(int conversionType) {
          switch (conversionType) {
          case Constant.JCL_TO_SLF4J:
              return new JCLRuleSet();
          case Constant.LOG4J_TO_SLF4J:
              return new Log4jRuleSet();
          case Constant.JUL_TO_SLF4J:
              return new JULRuleSet();
          case Constant.NOP_TO_SLF4J:
              return new EmptyRuleSet();
          default:
              return null;
          }
      }