code: @Nullable
    public static <E extends AbstractOperator> E findForClass(@Nonnull final Class<E> operatorClass) {
      for (final AbstractOperator operator : getAllOperators()) {
        if (operator.getClass() == operatorClass) {
          return operatorClass.cast(operator);
        }
      }
      return null;
    }
docs: Find an operator handler for its class
  
  @param <E>           the handler class extends AbstractOperator
  @param operatorClass the class to be used for search, must not be null
  @return an instance of the handler or null if there is not any such one