code: protected void generateIndexFile(Character unicode) throws IOException {
          String title = configuration.getText("doclet.Window_Split_Index",
                  unicode.toString());
          Content body = getBody(true, getWindowTitle(title));
          addTop(body);
          addNavLinks(true, body);
          HtmlTree divTree = new HtmlTree(HtmlTag.DIV);
          divTree.addStyle(HtmlStyle.contentContainer);
          addLinksForIndexes(divTree);
          addContents(unicode, indexbuilder.getMemberList(unicode), divTree);
          addLinksForIndexes(divTree);
          body.addContent(divTree);
          addNavLinks(false, body);
          addBottom(body);
          printHtmlDocument(null, true, body);
      }
docs: Generate the contents of each index file, with Header, Footer,
  Member Field, Method and Constructor Description.
  
  @param unicode Unicode character referring to the character for the
  index.