/*
 * Copyright (c) 1998, 2015, 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 com.sun.tools.doclets.formats.html;

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

import com.sun.javadoc.*;
import com.sun.tools.doclets.formats.html.markup.*;
import com.sun.tools.doclets.internal.toolkit.*;
import com.sun.tools.doclets.internal.toolkit.util.*;

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)
 */
@Deprecated
public class ClassUseWriter extends SubWriterHolderWriter {

    final ClassDoc classdoc;
    Set<PackageDoc> pkgToPackageAnnotations = null;
    final Map<String,List<ProgramElementDoc>> pkgToClassTypeParameter;
    final Map<String,List<ProgramElementDoc>> pkgToClassAnnotations;
    final Map<String,List<ProgramElementDoc>> pkgToMethodTypeParameter;
    final Map<String,List<ProgramElementDoc>> pkgToMethodArgTypeParameter;
    final Map<String,List<ProgramElementDoc>> pkgToMethodReturnTypeParameter;
    final Map<String,List<ProgramElementDoc>> pkgToMethodAnnotations;
    final Map<String,List<ProgramElementDoc>> pkgToMethodParameterAnnotations;
    final Map<String,List<ProgramElementDoc>> pkgToFieldTypeParameter;
    final Map<String,List<ProgramElementDoc>> pkgToFieldAnnotations;
    final Map<String,List<ProgramElementDoc>> pkgToSubclass;
    final Map<String,List<ProgramElementDoc>> pkgToSubinterface;
    final Map<String,List<ProgramElementDoc>> pkgToImplementingClass;
    final Map<String,List<ProgramElementDoc>> pkgToField;
    final Map<String,List<ProgramElementDoc>> pkgToMethodReturn;
    final Map<String,List<ProgramElementDoc>> pkgToMethodArgs;
    final Map<String,List<ProgramElementDoc>> pkgToMethodThrows;
    final Map<String,List<ProgramElementDoc>> pkgToConstructorAnnotations;
    final Map<String,List<ProgramElementDoc>> pkgToConstructorParameterAnnotations;
    final Map<String,List<ProgramElementDoc>> pkgToConstructorArgs;
    final Map<String,List<ProgramElementDoc>> pkgToConstructorArgTypeParameter;
    final Map<String,List<ProgramElementDoc>> pkgToConstructorThrows;
    final SortedSet<PackageDoc> 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.
Throws:
IOException – 
DocletAbortException – /**
     * Constructor.
     *
     * @param filename the file to be generated.
     * @throws IOException
     * @throws DocletAbortException
     */
    public ClassUseWriter(ConfigurationImpl configuration,
                          ClassUseMapper mapper, DocPath filename,
                          ClassDoc classdoc) throws IOException {
        super(configuration, filename);
        this.classdoc = classdoc;
        if (mapper.classToPackageAnnotations.containsKey(classdoc.qualifiedName()))
                pkgToPackageAnnotations = new TreeSet<>(mapper.classToPackageAnnotations.get(classdoc.qualifiedName()));
        configuration.currentcd = classdoc;
        this.pkgSet = new TreeSet<>();
        this.pkgToClassTypeParameter = pkgDivide(mapper.classToClassTypeParam);
        this.pkgToClassAnnotations = pkgDivide(mapper.classToClassAnnotations);
        this.pkgToMethodTypeParameter = pkgDivide(mapper.classToExecMemberDocTypeParam);
        this.pkgToMethodArgTypeParameter = pkgDivide(mapper.classToExecMemberDocArgTypeParam);
        this.pkgToFieldTypeParameter = pkgDivide(mapper.classToFieldDocTypeParam);
        this.pkgToFieldAnnotations = pkgDivide(mapper.annotationToFieldDoc);
        this.pkgToMethodReturnTypeParameter = pkgDivide(mapper.classToExecMemberDocReturnTypeParam);
        this.pkgToMethodAnnotations = pkgDivide(mapper.classToExecMemberDocAnnotations);
        this.pkgToMethodParameterAnnotations = pkgDivide(mapper.classToExecMemberDocParamAnnotation);
        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.classToConstructorDocArgTypeParam);
        this.pkgToConstructorThrows = pkgDivide(mapper.classToConstructorThrows);
        //tmp test
        if (pkgSet.size() > 0 &&
            mapper.classToPackage.containsKey(classdoc.qualifiedName()) &&
            !pkgSet.equals(mapper.classToPackage.get(classdoc.qualifiedName()))) {
            configuration.root.printWarning("Internal error: package sets don't match: " + pkgSet + " with: " +
                                   mapper.classToPackage.get(classdoc.qualifiedName()));
        }
        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.
Throws:
DocletAbortException – /**
     * Write out class use pages.
     * @throws DocletAbortException
     */
    public static void generate(ConfigurationImpl configuration,
                                ClassTree classtree)  {
        ClassUseMapper mapper = new ClassUseMapper(configuration, classtree);
        for (ClassDoc aClass : configuration.root.classes()) {
            // 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(aClass.containingPackage())))
                ClassUseWriter.generate(configuration, mapper, aClass);
        }
        for (PackageDoc 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<String,List<ProgramElementDoc>> pkgDivide(Map<String,? extends List<? extends ProgramElementDoc>> classMap) {
        Map<String,List<ProgramElementDoc>> map = new HashMap<>();
        List<? extends ProgramElementDoc> list= classMap.get(classdoc.qualifiedName());
        if (list != null) {
            Collections.sort(list, utils.makeComparatorForClassUse());
            for (ProgramElementDoc doc : list) {
                PackageDoc pkg = doc.containingPackage();
                pkgSet.add(pkg);
                List<ProgramElementDoc> inPkg = map.get(pkg.name());
                if (inPkg == null) {
                    inPkg = new ArrayList<>();
                    map.put(pkg.name(), inPkg);
                }
                inPkg.add(doc);
            }
        }
        return map;
    }

    
Generate a class page.
/**
     * Generate a class page.
     */
    public static void generate(ConfigurationImpl configuration,
                                ClassUseMapper mapper, ClassDoc classdoc) {
        ClassUseWriter clsgen;
        DocPath path = DocPath.forPackage(classdoc)
                .resolve(DocPaths.CLASS_USE)
                .resolve(DocPath.forName(classdoc));
        try {
            clsgen = new ClassUseWriter(configuration,
                                        mapper, path,
                                        classdoc);
            clsgen.generateClassUseFile();
            clsgen.close();
        } catch (IOException exc) {
            configuration.standardmessage.
                error("doclet.exception_encountered",
                      exc.toString(), path.getPath());
            throw new DocletAbortException(exc);
        }
    }

    
Generate the class use list.
/**
     * Generate the class use list.
     */
    protected void generateClassUseFile() throws IOException {
        HtmlTree body = getClassUseHeader();
        HtmlTree div = new HtmlTree(HtmlTag.DIV);
        div.addStyle(HtmlStyle.classUseContainer);
        if (pkgSet.size() > 0) {
            addClassUse(div);
        } else {
            div.addContent(getResource("doclet.ClassUse_No.usage.of.0",
                    classdoc.qualifiedName()));
        }
        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) throws IOException {
        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 list that use the given class.
Params:
contentTree – the content tree to which the packages list will be added/**
     * Add the packages list that use the given class.
     *
     * @param contentTree the content tree to which the packages list will be added
     */
    protected void addPackageList(Content contentTree) throws IOException {
        Content caption = getTableCaption(configuration.getResource(
                "doclet.ClassUse_Packages.that.use.0",
                getLink(new LinkInfoImpl(configuration, LinkInfoImpl.Kind.CLASS_USE_HEADER, classdoc))));
        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);
        Iterator<PackageDoc> it = pkgSet.iterator();
        for (int i = 0; it.hasNext(); i++) {
            PackageDoc pkg = it.next();
            HtmlTree tr = new HtmlTree(HtmlTag.TR);
            if (i % 2 == 0) {
                tr.addStyle(HtmlStyle.altColor);
            } else {
                tr.addStyle(HtmlStyle.rowColor);
            }
            addPackageUse(pkg, tr);
            tbody.addContent(tr);
        }
        table.addContent(tbody);
        Content li = HtmlTree.LI(HtmlStyle.blockList, table);
        contentTree.addContent(li);
    }

    
Add the package annotation list.
Params:
contentTree – the content tree to which the package annotation list will be added/**
     * Add the package annotation list.
     *
     * @param contentTree the content tree to which the package annotation list will be added
     */
    protected void addPackageAnnotationList(Content contentTree) throws IOException {
        if ((!classdoc.isAnnotationType()) ||
                pkgToPackageAnnotations == null ||
                pkgToPackageAnnotations.isEmpty()) {
            return;
        }
        Content caption = getTableCaption(configuration.getResource(
                "doclet.ClassUse_PackageAnnotation",
                getLink(new LinkInfoImpl(configuration,
                                LinkInfoImpl.Kind.CLASS_USE_HEADER, classdoc))));
        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);
        Iterator<PackageDoc> it = pkgToPackageAnnotations.iterator();
        for (int i = 0; it.hasNext(); i++) {
            PackageDoc pkg = it.next();
            HtmlTree tr = new HtmlTree(HtmlTag.TR);
            if (i % 2 == 0) {
                tr.addStyle(HtmlStyle.altColor);
            } else {
                tr.addStyle(HtmlStyle.rowColor);
            }
            Content tdFirst = HtmlTree.TD(HtmlStyle.colFirst,
                    getPackageLink(pkg, new StringContent(pkg.name())));
            tr.addContent(tdFirst);
            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 list that use the given class.
Params:
contentTree – the content tree to which the class list will be added/**
     * Add the class list that use the given class.
     *
     * @param contentTree the content tree to which the class list will be added
     */
    protected void addClassList(Content contentTree) throws IOException {
        HtmlTree ul = new HtmlTree(HtmlTag.UL);
        ul.addStyle(HtmlStyle.blockList);
        for (PackageDoc pkg : pkgSet) {
            Content markerAnchor = getMarkerAnchor(getPackageAnchorName(pkg));
            HtmlTree htmlTree = (configuration.allowTag(HtmlTag.SECTION))
                    ? HtmlTree.SECTION(markerAnchor)
                    : HtmlTree.LI(HtmlStyle.blockList, markerAnchor);
            Content link = getResource("doclet.ClassUse_Uses.of.0.in.1",
                                       getLink(new LinkInfoImpl(configuration, LinkInfoImpl.Kind.CLASS_USE_HEADER,
                                                                classdoc)),
                                       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(PackageDoc pkg, Content contentTree) throws IOException {
        Content tdFirst = HtmlTree.TD(HtmlStyle.colFirst,
                getHyperLink(getPackageAnchorName(pkg), new StringContent(utils.getPackageName(pkg))));
        contentTree.addContent(tdFirst);
        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(PackageDoc pkg, Content contentTree) throws IOException {
        Content classLink = getLink(new LinkInfoImpl(configuration,
            LinkInfoImpl.Kind.CLASS_USE_HEADER, classdoc));
        Content pkgLink = getPackageLink(pkg, utils.getPackageName(pkg));
        classSubWriter.addUseInfo(pkgToClassAnnotations.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_Annotation", classLink,
                pkgLink), classUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToClassTypeParameter.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_TypeParameter", classLink,
                pkgLink), classUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToSubclass.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_Subclass", classLink,
                pkgLink), subclassUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToSubinterface.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_Subinterface", classLink,
                pkgLink), subinterfaceUseTableSummary, contentTree);
        classSubWriter.addUseInfo(pkgToImplementingClass.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_ImplementingClass", classLink,
                pkgLink), classUseTableSummary, contentTree);
        fieldSubWriter.addUseInfo(pkgToField.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_Field", classLink,
                pkgLink), fieldUseTableSummary, contentTree);
        fieldSubWriter.addUseInfo(pkgToFieldAnnotations.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_FieldAnnotations", classLink,
                pkgLink), fieldUseTableSummary, contentTree);
        fieldSubWriter.addUseInfo(pkgToFieldTypeParameter.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_FieldTypeParameter", classLink,
                pkgLink), fieldUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodAnnotations.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodAnnotations", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodParameterAnnotations.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodParameterAnnotations", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodTypeParameter.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodTypeParameter", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodReturn.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodReturn", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodReturnTypeParameter.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodReturnTypeParameter", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodArgs.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodArgs", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodArgTypeParameter.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodArgsTypeParameters", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        methodSubWriter.addUseInfo(pkgToMethodThrows.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_MethodThrows", classLink,
                pkgLink), methodUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorAnnotations.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_ConstructorAnnotations", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorParameterAnnotations.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_ConstructorParameterAnnotations", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorArgs.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_ConstructorArgs", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorArgTypeParameter.get(pkg.name()),
                configuration.getResource("doclet.ClassUse_ConstructorArgsTypeParameters", classLink,
                pkgLink), constructorUseTableSummary, contentTree);
        constrSubWriter.addUseInfo(pkgToConstructorThrows.get(pkg.name()),
                configuration.getResource("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(classdoc.isInterface()?
            "doclet.Interface":"doclet.Class");
        String clname = classdoc.qualifiedName();
        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(getResource("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 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), 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, classdoc)
                .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, 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 = classdoc.containingPackage().isIncluded() ?
            getHyperLink(DocPath.parent.resolve(DocPaths.PACKAGE_TREE), treeLabel) :
            getHyperLink(pathToRoot.resolve(DocPaths.OVERVIEW_TREE), treeLabel);
        Content li = HtmlTree.LI(linkContent);
        return li;
    }
}