code: public void convertClass(ClassDoc cd, DocPath outputdir) {
          if (cd == null) {
              return;
          }
          try {
              SourcePosition sp = cd.position();
              if (sp == null)
                  return;
              Reader r;
              // temp hack until we can update SourcePosition API.
              if (sp instanceof com.sun.tools.javadoc.SourcePositionImpl) {
                  FileObject fo = ((com.sun.tools.javadoc.SourcePositionImpl) sp).fileObject();
                  if (fo == null)
                      return;
                  r = fo.openReader(true);
              } else {
                  File file = sp.file();
                  if (file == null)
                      return;
                  r = new FileReader(file);
              }
              LineNumberReader reader = new LineNumberReader(r);
              int lineno = 1;
              String line;
              relativePath = DocPaths.SOURCE_OUTPUT
                      .resolve(DocPath.forPackage(cd))
                      .invert();
              Content body = getHeader();
              Content pre = new HtmlTree(HtmlTag.PRE);
              try {
                  while ((line = reader.readLine()) != null) {
                      addLineNo(pre, lineno);
                      addLine(pre, line, lineno);
                      lineno++;
                  }
              } finally {
                  reader.close();
              }
              addBlankLines(pre);
              Content div = HtmlTree.DIV(HtmlStyle.sourceContainer, pre);
              body.addContent(div);
              writeToFile(body, outputdir.resolve(DocPath.forClass(cd)));
          } catch (IOException e) {
              e.printStackTrace();
          }
      }
docs: Convert the given Class to an HTML.
  
  @param cd the class to convert.
  @param outputdir the name of the directory to output to.