code: @SlashedClassName
      @SuppressFBWarnings("TQ_EXPLICIT_UNKNOWN_SOURCE_VALUE_REACHES_ALWAYS_SINK")
      public static String toSlashedClassName(@SlashedClassName(when = When.UNKNOWN) String className) {
          if (className.indexOf('.') >= 0) {
              return className.replace('.', '/');
          }
          return className;
      }
docs: Convert class name to slashed format. If the class name is already in
  slashed format, it is returned unmodified.
  
  @param className
  a class name
  @return the same class name in slashed format