gt:     protected void addAllClassesLink(Content div) {
context: /*
   * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package jdk.javadoc.internal.doclets.formats.html;
  
  import java.io.*;
  import java.util.*;
  
  import javax.lang.model.element.PackageElement;
  
  import jdk.javadoc.internal.doclets.formats.html.markup.HtmlConstants;
  import jdk.javadoc.internal.doclets.formats.html.markup.HtmlStyle;
  import jdk.javadoc.internal.doclets.formats.html.markup.HtmlTag;
  import jdk.javadoc.internal.doclets.formats.html.markup.HtmlTree;
  import jdk.javadoc.internal.doclets.formats.html.markup.RawHtml;
  import jdk.javadoc.internal.doclets.toolkit.Content;
  import jdk.javadoc.internal.doclets.toolkit.util.DocPath;
  
  /**
   * Abstract class to generate the overview files in
   * Frame and Non-Frame format. This will be sub-classed by to
   * generate overview-frame.html as well as overview-summary.html.
   *
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   *
   * @author Atul M Dambalkar
   * @author Bhavesh Patel (Modified)
   */
  public abstract class AbstractPackageIndexWriter extends HtmlDocletWriter {
  
      /**
       * A Set of Packages to be documented.
       */
      protected SortedSet<PackageElement> packages;
  
      /**
       * Constructor. Also initializes the packages variable.
       *
       * @param configuration  The current configuration
       * @param filename Name of the package index file to be generated.
       */
      public AbstractPackageIndexWriter(ConfigurationImpl configuration,
                                        DocPath filename) {
          super(configuration, filename);
          packages = configuration.packages;
      }
  
      /**
       * Adds the navigation bar header to the documentation tree.
       *
       * @param body the document tree to which the navigation bar header will be added
       */
      protected abstract void addNavigationBarHeader(Content body);
  
      /**
       * Adds the navigation bar footer to the documentation tree.
       *
       * @param body the document tree to which the navigation bar footer will be added
       */
      protected abstract void addNavigationBarFooter(Content body);
  
      /**
       * Adds the overview header to the documentation tree.
       *
       * @param body the document tree to which the overview header will be added
       */
      protected abstract void addOverviewHeader(Content body);
  
      /**
       * Adds the packages list to the documentation tree.
       *
       * @param packages a collection of packagedoc objects
       * @param text caption for the table
       * @param tableSummary summary for the table
       * @param body the document tree to which the packages list will be added
       */
      protected abstract void addPackagesList(Collection<PackageElement> packages, String text,
              String tableSummary, Content body);
  
      /**
       * Generate and prints the contents in the package index file. Call appropriate
       * methods from the sub-class in order to generate Frame or Non
       * Frame format.
       *
       * @param title the title of the window.
       * @param includeScript boolean set true if windowtitle script is to be included
       */
      protected void buildPackageIndexFile(String title, boolean includeScript) throws IOException {
          String windowOverview = configuration.getText(title);
          Content body = getBody(includeScript, getWindowTitle(windowOverview));
          addNavigationBarHeader(body);
          addOverviewHeader(body);
          addIndex(body);
          addOverview(body);
          addNavigationBarFooter(body);
          printHtmlDocument(configuration.metakeywords.getOverviewMetaKeywords(title,
                  configuration.doctitle), includeScript, body);
      }
  
      /**
       * Default to no overview, override to add overview.
       *
       * @param body the document tree to which the overview will be added
       */
      protected void addOverview(Content body) throws IOException {
      }
  
      /**
       * Adds the frame or non-frame package index to the documentation tree.
       *
       * @param body the document tree to which the index will be added
       */
      protected void addIndex(Content body) {
          addIndexContents(packages, "doclet.Package_Summary",
                  configuration.getText("doclet.Member_Table_Summary",
                  configuration.getText("doclet.Package_Summary"),
                  configuration.getText("doclet.packages")), body);
      }
  
      /**
       * Adds package index contents. Call appropriate methods from
       * the sub-classes. Adds it to the body HtmlTree
       *
       * @param packages a collection of packages to be documented
       * @param text string which will be used as the heading
       * @param tableSummary summary for the table
       * @param body the document tree to which the index contents will be added
       */
      protected void addIndexContents(Collection<PackageElement> packages, String text,
              String tableSummary, Content body) {
          if (!packages.isEmpty()) {
              HtmlTree htmlTree = (configuration.allowTag(HtmlTag.NAV))
                      ? HtmlTree.NAV()
                      : new HtmlTree(HtmlTag.DIV);
              htmlTree.addStyle(HtmlStyle.indexNav);
              HtmlTree ul = new HtmlTree(HtmlTag.UL);
              addAllClassesLink(ul);
              if (configuration.showModules) {
                  addAllModulesLink(ul);
              }
              htmlTree.addContent(ul);
              body.addContent(htmlTree);
              addPackagesList(packages, text, tableSummary, body);
          }
      }
  
      /**
       * Adds the doctitle to the documentation tree, if it is specified on the command line.
       *
       * @param body the document tree to which the title will be added
       */
      protected void addConfigurationTitle(Content body) {
          if (configuration.doctitle.length() > 0) {
              Content title = new RawHtml(configuration.doctitle);
              Content heading = HtmlTree.HEADING(HtmlConstants.TITLE_HEADING,
                      HtmlStyle.title, title);
              Content div = HtmlTree.DIV(HtmlStyle.header, heading);
              body.addContent(div);
          }
      }
  
      /**
       * Returns highlighted "Overview", in the navigation bar as this is the
       * overview page.
       *
       * @return a Content object to be added to the documentation tree
       */
      protected Content getNavLinkContents() {
          Content li = HtmlTree.LI(HtmlStyle.navBarCell1Rev, contents.overviewLabel);
          return li;
      }
  
      /**
       * Do nothing. This will be overridden.
       *
       * @param div the document tree to which the all classes link will be added
       */
  