code: public final void setIndentationToken(final String indentationToken) {
  
          // Check sanity
          if (indentationToken == null || indentationToken.isEmpty()) {
              throw new IllegalArgumentException("Cannot handle null or empty 'indentationToken' argument.");
          }
  
          // Assign internal state
          this.indentationToken = indentationToken;
      }
docs: Assigns the indentationToken of this RenderConfiguration.
  
  @param indentationToken the indentationToken of this RenderConfiguration. Cannot be null or empty.