code: public final void setLineBreak(LineBreak lineBreak) {
  
          // Copy to the field, but convert null to LineBreak.NONE
          _lineBreak = lineBreak != null ? lineBreak : LineBreak.NONE;
  
          // Get the corresponding characters in a separate field
          _lineBreakChars = _lineBreak._lineBreakChars;
  
          // If there is no line break, there shall be no indentation
          if (_lineBreak == LineBreak.NONE) {
              _indentation = "";
          }
  
          // State has changed, check
          checkInvariants();
      }
docs: Sets the type of line break to use. If the line break is set to <code>LineBreak.NONE</code>,
  then the indentation is reset to an empty
  string.
  
  @param lineBreak the line break to use; specifying <code>null</code> as the argument
  is equivalent to specifying {@link LineBreak#NONE}.