/*
 * 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
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package jdk.javadoc.internal.doclets.formats.html;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

import javax.lang.model.element.Element;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;

import jdk.javadoc.internal.doclets.formats.html.markup.ContentBuilder;
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.StringContent;
import jdk.javadoc.internal.doclets.toolkit.Content;
import jdk.javadoc.internal.doclets.toolkit.util.ClassTree;
import jdk.javadoc.internal.doclets.toolkit.util.ClassUseMapper;
import jdk.javadoc.internal.doclets.toolkit.util.DocFileIOException;
import jdk.javadoc.internal.doclets.toolkit.util.DocPath;
import jdk.javadoc.internal.doclets.toolkit.util.DocPaths;


Generate class usage information.
 
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.
Author:
Robert G. Field, Bhavesh Patel (Modified)/**
 * Generate class usage information.
 *
 *  <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 Robert G. Field
 * @author Bhavesh Patel (Modified)
 */
public class ClassUseWriter extends SubWriterHolderWriter {

    final TypeElement typeElement;
    Set<PackageElement> pkgToPackageAnnotations = null;
    final Map<PackageElement, List<Element>> pkgToClassTypeParameter;
    final Map<PackageElement, List<Element>> pkgToClassAnnotations;
    final Map<PackageElement, List<Element>> pkgToMethodTypeParameter;
    final Map<PackageElement, List<Element>> pkgToMethodArgTypeParameter;
    final Map<PackageElement, List<Element>> pkgToMethodReturnTypeParameter;
    final Map<PackageElement, List<Element>> pkgToMethodAnnotations;
    final Map<PackageElement, List<Element>> pkgToMethodParameterAnnotations;
    final Map<PackageElement, List<Element>> pkgToFieldTypeParameter;
    final Map<PackageElement, List<Element>> pkgToFieldAnnotations;
    final Map<PackageElement, List<Element>> pkgToSubclass;
    final Map<PackageElement, List<Element>> pkgToSubinterface;
    final Map<PackageElement, List<Element>> pkgToImplementingClass;
    final Map<PackageElement, List<Element>> pkgToField;
    final Map<PackageElement, List<Element>> pkgToMethodReturn;
    final Map<PackageElement, List<Element>> pkgToMethodArgs;
    final Map<PackageElement, List<Element>> pkgToMethodThrows;
    final Map<PackageElement, List<Element>> pkgToConstructorAnnotations;
    final Map<PackageElement, List<Element>> pkgToConstructorParameterAnnotations;
    final Map<PackageElement, List<Element>> pkgToConstructorArgs;
    final Map<PackageElement, List<Element>> pkgToConstructorArgTypeParameter;
    final Map<PackageElement, List<Element>> pkgToConstructorThrows;
    final SortedSet<PackageElement> pkgSet;
    final MethodWriterImpl methodSubWriter;
    final ConstructorWriterImpl constrSubWriter;
    final FieldWriterImpl fieldSubWriter;
    final NestedClassWriterImpl classSubWriter;
    // Summary for various use tables.
    final String classUseTableSummary;
    final String subclassUseTableSummary;
    final String subinterfaceUseTableSummary;
    final String fieldUseTableSummary;
    final String methodUseTableSummary;
    final String constructorUseTableSummary;

    
The HTML tree for main tag.
/**
     * The HTML tree for main tag.
     */
    protected HtmlTree mainTree = HtmlTree.MAIN();

    
Constructor.
Params:
filename – the file to be generated./**
     * Constructor.
     *
     * @param filename the file to be generated.
     */
    public ClassUseWriter(ConfigurationImpl configuration,
                          ClassUseMapper mapper, DocPath filename,
                          TypeElement typeElement) {
        super(configuration, filename);
        this.typeElement = typeElement;
        if (mapper.classToPackageAnnotations.containsKey(typeElement)) {
            pkgToPackageAnnotations = new TreeSet<>(utils.makeClassUseComparator());
            pkgToPackageAnnotations.addAll(mapper.classToPackageAnnotations.get(typeElement));
        }
        configuration.currentTypeElement = typeElement;
        this.pkgSet = new TreeSet<>(utils.makePackageComparator());
        this.pkgToClassTypeParameter = pkgDivide(mapper.classToClassTypeParam);
        this.pkgToClassAnnotations = pkgDivide(mapper.classToClassAnnotations);
        this.pkgToMethodTypeParameter = pkgDivide(mapper.classToMethodTypeParam);
        this.pkgToMethodArgTypeParameter = pkgDivide(mapper.classToMethodArgTypeParam);
        this.pkgToFieldTypeParameter = pkgDivide(mapper.classToFieldTypeParam);
        this.pkgToFieldAnnotations = pkgDivide(mapper.annotationToField);
        this.pkgToMethodReturnTypeParameter = pkgDivide(mapper.classToMethodReturnTypeParam);
        this.pkgToMethodAnnotations = pkgDivide(mapper.classToMethodAnnotations);
        this.pkgToMethodParameterAnnotations = pkgDivide(mapper.classToMethodParamAnnotation);
        this.pkgToSubclass = pkgDivide(mapper.classToSubclass);
        this.pkgToSubinterface = pkgDivide(mapper.classToSubinterface);
        this.pkgToImplementingClass = pkgDivide(mapper.classToImplementingClass);
        this.pkgToField = pkgDivide(mapper.classToField);
        this.pkgToMethodReturn = pkgDivide(mapper.classToMethodReturn);
        this.pkgToMethodArgs = pkgDivide(mapper.classToMethodArgs);
        this.pkgToMethodThrows = pkgDivide(mapper.classToMethodThrows);
        this.pkgToConstructorAnnotations = pkgDivide(mapper.classToConstructorAnnotations);
        this.pkgToConstructorParameterAnnotations = pkgDivide(mapper.classToConstructorParamAnnotation);
        this.pkgToConstructorArgs = pkgDivide(mapper.classToConstructorArgs);
        this.pkgToConstructorArgTypeParameter = pkgDivide(mapper.classToConstructorArgTypeParam);
        this.pkgToConstructorThrows = pkgDivide(mapper.classToConstructorThrows);
        //tmp test
        if (pkgSet.size() > 0 &&
            mapper.classToPackage.containsKey(this.typeElement) &&
            !pkgSet.equals(mapper.classToPackage.get(this.typeElement))) {
            configuration.reporter.print(Diagnostic.Kind.WARNING,
                    "Internal error: package sets don't match: "
                    + pkgSet + " with: " + mapper.classToPackage.get(this.typeElement));
        }
        methodSubWriter = new MethodWriterImpl(this);
        constrSubWriter = new ConstructorWriterImpl(this);
        fieldSubWriter = new FieldWriterImpl(this);
        classSubWriter = new NestedClassWriterImpl(this);
        classUseTableSummary = configuration.getText("doclet.Use_Table_Summary",
                configuration.getText("doclet.classes"));
        subclassUseTableSummary = configuration.getText("doclet.Use_Table_Summary",
                configuration.getText("doclet.subclasses"));
        subinterfaceUseTableSummary = configuration.getText("doclet.Use_Table_Summary",
                configuration.getText("doclet.subinterfaces"));
        fieldUseTableSummary = configuration.getText("doclet.Use_Table_Summary",
                configuration.getText("doclet.fields"));
        methodUseTableSummary = configuration.getText("doclet.Use_Table_Summary",
                configuration.getText("doclet.methods"));
        constructorUseTableSummary = configuration.getText("doclet.Use_Table_Summary",
                configuration.getText("doclet.constructors"));
    }

    
Write out class use pages.
Params:
configuration – the configuration for this doclet
classtree – the class tree hierarchy
Throws:
DocFileIOException – if there is an error while generating the documentation/**
     * Write out class use pages.
     *
     * @param configuration the configuration for this doclet
     * @param classtree the class tree hierarchy
     * @throws DocFileIOException if there is an error while generating the documentation
     */
    public static void generate(ConfigurationImpl configuration, ClassTree classtree) throws DocFileIOException  {
        ClassUseMapper mapper = new ClassUseMapper(configuration, classtree);
        for (TypeElement aClass : configuration.getIncludedTypeElements()) {
            // If -nodeprecated option is set and the containing package is marked
            // as deprecated, do not generate the class-use page. We will still generate
            // the class-use page if the class is marked as deprecated but the containing
            // package is not since it could still be linked from that package-use page.
            if (!(configuration.nodeprecated &&
                  configuration.utils.isDeprecated(configuration.utils.containingPackage(aClass))))
                ClassUseWriter.generate(configuration, mapper, aClass);
        }
        for (PackageElement pkg : configuration.packages) {
            // If -nodeprecated option is set and the package is marked
            // as deprecated, do not generate the package-use page.
            if (!(configuration.nodeprecated && configuration.utils.isDeprecated(pkg)))
                PackageUseWriter.generate(configuration, mapper, pkg);
        }
    }

    private Map<PackageElement, List<Element>> pkgDivide(Map<TypeElement, ? extends List<? extends Element>> classMap) {
        Map<PackageElement, List<Element>> map = new HashMap<>();
        List<? extends Element> elements = (List<? extends Element>) classMap.get(typeElement);
        if (elements != null) {
            Collections.sort(elements, utils.makeClassUseComparator());
            for (Element e : elements) {
                PackageElement pkg = utils.containingPackage(e);
                pkgSet.add(pkg);
                List<Element> inPkg = map.get(pkg);
                if (inPkg == null) {
                    inPkg = new ArrayList<>();
                    map.put(pkg, inPkg);
                }
                inPkg.add(e);
            }
        }
        return map;
    }

    
Generate a class page.
Throws:
DocFileIOException – if there is a problem while generating the documentation/**
     * Generate a class page.
     *
     * @throws DocFileIOException if there is a problem while generating the documentation
     */
    public static void generate(ConfigurationImpl configuration, ClassUseMapper mapper,
                                TypeElement typeElement) throws DocFileIOException {
        ClassUseWriter clsgen;
        DocPath path = DocPath.forPackage(configuration.utils, typeElement)
                              .resolve(DocPaths.CLASS_USE)
                              .resolve(DocPath.forName(configuration.utils, typeElement));
        clsgen = new ClassUseWriter(configuration, mapper, path, typeElement);
        clsgen.generateClassUseFile();
    }

    
Generate the class use elements.
Throws:
DocFileIOException – if there is a problem while generating the documentation/**
     * Generate the class use elements.
     *
     * @throws DocFileIOException if there is a problem while generating the documentation
     */
    protected void generateClassUseFile() throws DocFileIOException {
        HtmlTree body = getClassUseHeader();
        HtmlTree div = new HtmlTree(HtmlTag.DIV);
        div.addStyle(HtmlStyle.classUseContainer);
        if (pkgSet.size() > 0) {
            addClassUse(div);
        } else {
            div.addContent(contents.getContent("doclet.ClassUse_No.usage.of.0",
                    utils.getFullyQualifiedName(typeElement)));
        }
        if (configuration.allowTag(HtmlTag.MAIN)) {
            mainTree.addContent(div);
            body.addContent(mainTree);
        } else {
            body.addContent(div);
        }
        HtmlTree htmlTree = (configuration.allowTag(HtmlTag.FOOTER))
                ? HtmlTree.FOOTER()
                : body;
        addNavLinks(false, htmlTree);
        addBottom(htmlTree);
        if (configuration.allowTag(HtmlTag.FOOTER)) {
            body.addContent(htmlTree);
        }
        printHtmlDocument(null, true, body);
    }

    
Add the class use documentation.
Params:
contentTree – the content tree to which the class use information will be added/**
     * Add the class use documentation.
     *
     * @param contentTree the content tree to which the class use information will be added
     */
    protected void addClassUse(Content contentTree) {
        HtmlTree ul = new HtmlTree(HtmlTag.UL);
        ul.addStyle(HtmlStyle.blockList);
        if (configuration.packages.size() > 1) {
            addPackageList(ul);
            addPackageAnnotationList(ul);
        }
        addClassList(ul);
        contentTree.addContent(ul);
    }

    
Add the packages elements that use the given class.
Params:
contentTree – the content tree to which the packages elements will be added/**
     * Add the packages elements that use the given class.
     *
     * @param contentTree the content tree to which the packages elements will be added
     */
    protected void addPackageList(Content contentTree) {
        Content caption = getTableCaption(configuration.getContent(
                "doclet.ClassUse_Packages.that.use.0",
                getLink(new LinkInfoImpl(configuration,
                        LinkInfoImpl.Kind.CLASS_USE_HEADER, typeElement))));
        Content table = (configuration.isOutputHtml5())
                ? HtmlTree.TABLE(HtmlStyle.useSummary, caption)
                : HtmlTree.TABLE(HtmlStyle.useSummary, useTableSummary, caption);
        table.addContent(getSummaryTableHeader(packageTableHeader, "col"));
        Content tbody = new HtmlTree(HtmlTag.TBODY);
        boolean altColor = true;
        for (PackageElement pkg : pkgSet) {
            HtmlTree tr = new HtmlTree(HtmlTag.TR);
            tr.addStyle(altColor ? HtmlStyle.altColor : HtmlStyle.rowColor);
            altColor = !altColor;
            addPackageUse(pkg, tr);
            tbody.addContent(tr);
        }
        table.addContent(tbody);
        Content li = HtmlTree.LI(HtmlStyle.blockList, table);
        contentTree.addContent(li);
    }

    
Add the package annotation elements.
Params:
contentTree – the content tree to which the package annotation elements will be added/**
     * Add the package annotation elements.
     *
     * @param contentTree the content tree to which the package annotation elements will be added
     */
    protected void addPackageAnnotationList(Content contentTree) {
        if (!utils.isAnnotationType(typeElement) ||
                pkgToPackageAnnotations == null ||
                pkgToPackageAnnotations.isEmpty()) {
            return;
        }
        Content caption = getTableCaption(configuration.getContent(
                "doclet.ClassUse_PackageAnnotation",
                getLink(new LinkInfoImpl(configuration,
                        LinkInfoImpl.Kind.CLASS_USE_HEADER, typeElement))));
        Content table = (configuration.isOutputHtml5())
                ? HtmlTree.TABLE(HtmlStyle.useSummary, caption)
                : HtmlTree.TABLE(HtmlStyle.useSummary, useTableSummary, caption);
        table.addContent(getSummaryTableHeader(packageTableHeader, "col"));
        Content tbody = new HtmlTree(HtmlTag.TBODY);
        boolean altColor = true;
        for (PackageElement pkg : pkgToPackageAnnotations) {
            HtmlTree tr = new HtmlTree(HtmlTag.TR);
            tr.addStyle(altColor ? HtmlStyle.altColor : HtmlStyle.rowColor);
            altColor = !altColor;
            Content thFirst = HtmlTree.TH_ROW_SCOPE(HtmlStyle.colFirst, getPackageLink(pkg));
            tr.addContent(thFirst);
            HtmlTree tdLast = new HtmlTree(HtmlTag.TD);
            tdLast.addStyle(HtmlStyle.colLast);
            addSummaryComment(pkg, tdLast);
            tr.addContent(tdLast);
            tbody.addContent(tr);
        }
        table.addContent(tbody);
        Content li = HtmlTree.LI(HtmlStyle.blockList, table);
        contentTree.addContent(li);
    }

    
Add the class elements that use the given class.
Params:
contentTree – the content tree to which the class elements will be added/**
     * Add the class elements that use the given class.
     *
     * @param contentTree the content tree to which the class elements will be added
     */
    protected void addClassList(Content contentTree) {
        HtmlTree ul = new HtmlTree(HtmlTag.UL);
        ul.addStyle(HtmlStyle.blockList);
        for (PackageElement pkg : pkgSet) {
            Content markerAnchor = getMarkerAnchor(getPackageAnchorName(pkg));
            HtmlTree htmlTree = (configuration.allowTag(HtmlTag.SECTION))
                    ? HtmlTree.SECTION(markerAnchor)
                    : HtmlTree.LI(HtmlStyle.blockList, markerAnchor);
            Content link = contents.getContent("doclet.ClassUse_Uses.of.0.in.1",
                    getLink(new LinkInfoImpl(configuration, LinkInfoImpl.Kind.CLASS_USE_HEADER,
                            typeElement)),
                    getPackageLink(pkg, utils.getPackageName(pkg)));
            Content heading = HtmlTree.HEADING(HtmlConstants.SUMMARY_HEADING, link);
            htmlTree.addContent(heading);
            addClassUse(pkg, htmlTree);
            if (configuration.allowTag(HtmlTag.SECTION)) {
                ul.addContent(HtmlTree.LI(HtmlStyle.blockList, htmlTree));
            } else {
                ul.addContent(htmlTree);
            }
        }
        Content li = HtmlTree.LI(HtmlStyle.blockList, ul);
        contentTree.addContent(li);
    }

    
Add the package use information.
Params:
pkg – the package that uses the given class
contentTree – the content tree to which the package use information will be added/**
     * Add the package use information.
     *
     * @param pkg the package that uses the given class
     * @param contentTree the content tree to which the package use information will be added
     */
    protected void addPackageUse(PackageElement pkg, Content contentTree) {
        Content thFirst = HtmlTree.TH_ROW_SCOPE(HtmlStyle.colFirst,
                getHyperLink(getPackageAnchorName(pkg), new StringContent(utils.getPackageName(pkg))));
        contentTree.addContent(thFirst);
        HtmlTree tdLast = new HtmlTree(HtmlTag.TD);
        tdLast.addStyle(HtmlStyle.colLast);
        addSummaryComment(pkg, tdLast);
        contentTree.addContent(tdLast);
    }

    
Add the class use information.
Params:
pkg – the package that uses the given class
contentTree – the content tree to which the class use information will be added/**
     * Add the class use information.
     *
     * @param pkg the package that uses the given class
     * @param contentTree the content tree to which the class use information will be added
     */
    protected void addClassUse(PackageElement pkg, Content contentTree) {
        Content classLink = getLink(new LinkInfoImpl(configuration,
            LinkInfoImpl.Kind.CLASS_USE_HEADER, typeElement));
        Content pkgLink = getPackageLink(pkg, utils.getPackageName(pkg));
        classSubWriter.addUseInfo(pkgToClassAnnotations.get(pkg),
                configuration.getContent("doclet.ClassUse_Annotation", classLink,
                pkgLink), classUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToClassTypeParameter.get(pkg),
                configuration.getContent("doclet.ClassUse_TypeParameter", classLink,
                pkgLink), classUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToSubclass.get(pkg),
                configuration.getContent("doclet.ClassUse_Subclass", classLink,
                pkgLink), subclassUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToSubinterface.get(pkg),
                configuration.getContent("doclet.ClassUse_Subinterface", classLink,
                pkgLink), subinterfaceUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToImplementingClass.get(pkg),
                configuration.getContent("doclet.ClassUse_ImplementingClass", classLink,
                pkgLink), classUseTableSummary, contentTree);
        fieldSubWriter.addUseInfo(pkgToField.get(pkg),
                configuration.getContent("doclet.ClassUse_Field", classLink,
                pkgLink), fieldUseTableSummary, contentTree);
        fieldSubWriter.addUseInfo(pkgToFieldAnnotations.get(pkg),
                configuration.getContent("doclet.ClassUse_FieldAnnotations", classLink,
                pkgLink), fieldUseTableSummary, contentTree);
        fieldSubWriter.addUseInfo(pkgToFieldTypeParameter.get(pkg),
                configuration.getContent("doclet.ClassUse_FieldTypeParameter", classLink,
                pkgLink), fieldUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodAnnotations.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodAnnotations", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodParameterAnnotations.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodParameterAnnotations", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodTypeParameter.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodTypeParameter", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodReturn.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodReturn", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodReturnTypeParameter.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodReturnTypeParameter", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodArgs.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodArgs", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodArgTypeParameter.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodArgsTypeParameters", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodThrows.get(pkg),
                configuration.getContent("doclet.ClassUse_MethodThrows", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorAnnotations.get(pkg),
                configuration.getContent("doclet.ClassUse_ConstructorAnnotations", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorParameterAnnotations.get(pkg),
                configuration.getContent("doclet.ClassUse_ConstructorParameterAnnotations", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorArgs.get(pkg),
                configuration.getContent("doclet.ClassUse_ConstructorArgs", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorArgTypeParameter.get(pkg),
                configuration.getContent("doclet.ClassUse_ConstructorArgsTypeParameters", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorThrows.get(pkg),
                configuration.getContent("doclet.ClassUse_ConstructorThrows", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
    }

    
Get the header for the class use Listing.
Returns:
a content tree representing the class use header/**
     * Get the header for the class use Listing.
     *
     * @return a content tree representing the class use header
     */
    protected HtmlTree getClassUseHeader() {
        String cltype = configuration.getText(utils.isInterface(typeElement)
                ? "doclet.Interface"
                : "doclet.Class");
        String clname = utils.getFullyQualifiedName(typeElement);
        String title = configuration.getText("doclet.Window_ClassUse_Header",
                cltype, clname);
        HtmlTree bodyTree = getBody(true, getWindowTitle(title));
        HtmlTree htmlTree = (configuration.allowTag(HtmlTag.HEADER))
                ? HtmlTree.HEADER()
                : bodyTree;
        addTop(htmlTree);
        addNavLinks(true, htmlTree);
        if (configuration.allowTag(HtmlTag.HEADER)) {
            bodyTree.addContent(htmlTree);
        }
        ContentBuilder headContent = new ContentBuilder();
        headContent.addContent(contents.getContent("doclet.ClassUse_Title", cltype));
        headContent.addContent(new HtmlTree(HtmlTag.BR));
        headContent.addContent(clname);
        Content heading = HtmlTree.HEADING(HtmlConstants.CLASS_PAGE_HEADING,
                true, HtmlStyle.title, headContent);
        Content div = HtmlTree.DIV(HtmlStyle.header, heading);
        if (configuration.allowTag(HtmlTag.MAIN)) {
            mainTree.addContent(div);
        } else {
            bodyTree.addContent(div);
        }
        return bodyTree;
    }

    
Get the module link.
Returns:
a content tree for the module link/**
     * Get the module link.
     *
     * @return a content tree for the module link
     */
    @Override
    protected Content getNavLinkModule() {
        Content linkContent = getModuleLink(utils.elementUtils.getModuleOf(typeElement),
                contents.moduleLabel);
        Content li = HtmlTree.LI(linkContent);
        return li;
    }

    
Get this package link.
Returns:
a content tree for the package link/**
     * Get this package link.
     *
     * @return a content tree for the package link
     */
    protected Content getNavLinkPackage() {
        Content linkContent =
                getHyperLink(DocPath.parent.resolve(DocPaths.PACKAGE_SUMMARY), contents.packageLabel);
        Content li = HtmlTree.LI(linkContent);
        return li;
    }

    
Get class page link.
Returns:
a content tree for the class page link/**
     * Get class page link.
     *
     * @return a content tree for the class page link
     */
    protected Content getNavLinkClass() {
        Content linkContent = getLink(new LinkInfoImpl(
                configuration, LinkInfoImpl.Kind.CLASS_USE_HEADER, typeElement)
                .label(configuration.getText("doclet.Class")));
        Content li = HtmlTree.LI(linkContent);
        return li;
    }

    
Get the use link.
Returns:
a content tree for the use link/**
     * Get the use link.
     *
     * @return a content tree for the use link
     */
    protected Content getNavLinkClassUse() {
        Content li = HtmlTree.LI(HtmlStyle.navBarCell1Rev, contents.useLabel);
        return li;
    }

    
Get the tree link.
Returns:
a content tree for the tree link/**
     * Get the tree link.
     *
     * @return a content tree for the tree link
     */
    protected Content getNavLinkTree() {
        Content linkContent = utils.isEnclosingPackageIncluded(typeElement)
                ? getHyperLink(DocPath.parent.resolve(DocPaths.PACKAGE_TREE), contents.treeLabel)
                : getHyperLink(pathToRoot.resolve(DocPaths.OVERVIEW_TREE), contents.treeLabel);
        Content li = HtmlTree.LI(linkContent);
        return li;
    }
}