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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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 * 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).
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 * 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.
 *
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package jdk.javadoc.internal.doclets.formats.html;

import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.TreeSet;

import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;

import jdk.javadoc.internal.doclets.formats.html.markup.ContentBuilder;
import jdk.javadoc.internal.doclets.formats.html.markup.Entity;
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.Navigation;
import jdk.javadoc.internal.doclets.formats.html.markup.Navigation.PageMode;
import jdk.javadoc.internal.doclets.formats.html.markup.StringContent;
import jdk.javadoc.internal.doclets.formats.html.markup.Table;
import jdk.javadoc.internal.doclets.formats.html.markup.TableHeader;
import jdk.javadoc.internal.doclets.toolkit.Content;
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 package 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.
/**
 * Generate package 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>
 */
public class PackageUseWriter extends SubWriterHolderWriter {

    final PackageElement packageElement;
    final SortedMap<String, Set<TypeElement>> usingPackageToUsedClasses = new TreeMap<>();
    final String packageUseTableSummary;
    private final Navigation navBar;

    
Constructor.
Params:
configuration – the configuration
mapper – a mapper to provide details of where elements are used
filename – the file to be generated
pkgElement – the package element to be documented/**
     * Constructor.
     *
     * @param configuration the configuration
     * @param mapper a mapper to provide details of where elements are used
     * @param filename the file to be generated
     * @param pkgElement the package element to be documented
     */
    public PackageUseWriter(HtmlConfiguration configuration,
                            ClassUseMapper mapper, DocPath filename,
                            PackageElement pkgElement) {
        super(configuration, configuration.docPaths.forPackage(pkgElement).resolve(filename));
        this.packageElement = pkgElement;

        // by examining all classes in this package, find what packages
        // use these classes - produce a map between using package and
        // used classes.
        for (TypeElement usedClass : utils.getEnclosedTypeElements(pkgElement)) {
            Set<TypeElement> usingClasses = mapper.classToClass.get(usedClass);
            if (usingClasses != null) {
                for (TypeElement usingClass : usingClasses) {
                    PackageElement usingPackage = utils.containingPackage(usingClass);
                    Set<TypeElement> usedClasses = usingPackageToUsedClasses
                            .get(utils.getPackageName(usingPackage));
                    if (usedClasses == null) {
                        usedClasses = new TreeSet<>(utils.makeGeneralPurposeComparator());
                        usingPackageToUsedClasses.put(utils.getPackageName(usingPackage),
                                                      usedClasses);
                    }
                    usedClasses.add(usedClass);
                }
            }
        }

        packageUseTableSummary = resources.getText("doclet.Use_Table_Summary",
                resources.getText("doclet.packages"));
        this.navBar = new Navigation(packageElement, configuration, PageMode.USE, path);
    }

    
Generate a class page.
Params:
configuration – the current configuration of the doclet.
mapper –        the mapping of the class usage.
pkgElement –    the package being documented.
Throws:
DocFileIOException – if there is a problem generating the package use page/**
     * Generate a class page.
     *
     * @param configuration the current configuration of the doclet.
     * @param mapper        the mapping of the class usage.
     * @param pkgElement    the package being documented.
     * @throws DocFileIOException if there is a problem generating the package use page
     */
    public static void generate(HtmlConfiguration configuration,
                                ClassUseMapper mapper, PackageElement pkgElement)
            throws DocFileIOException {
        DocPath filename = DocPaths.PACKAGE_USE;
        PackageUseWriter pkgusegen = new PackageUseWriter(configuration, mapper, filename, pkgElement);
        pkgusegen.generatePackageUseFile();
    }

    
Generate the package use list.
Throws:
DocFileIOException – if there is a problem generating the package use page/**
     * Generate the package use list.
     * @throws DocFileIOException if there is a problem generating the package use page
     */
    protected void generatePackageUseFile() throws DocFileIOException {
        HtmlTree body = getPackageUseHeader();
        HtmlTree div = new HtmlTree(HtmlTag.DIV);
        div.setStyle(HtmlStyle.contentContainer);
        if (usingPackageToUsedClasses.isEmpty()) {
            div.add(contents.getContent("doclet.ClassUse_No.usage.of.0", utils.getPackageName(packageElement)));
        } else {
            addPackageUse(div);
        }
        bodyContents.addMainContent(div);
        HtmlTree footer = HtmlTree.FOOTER();
        navBar.setUserFooter(getUserHeaderFooter(false));
        footer.add(navBar.getContent(false));
        addBottom(footer);
        bodyContents.setFooter(footer);
        body.add(bodyContents.toContent());
        printHtmlDocument(null,
                getDescription("use", packageElement),
                body);
    }

    
Add the package use information.
Params:
contentTree – the content tree to which the package use information will be added/**
     * Add the package use information.
     *
     * @param contentTree the content tree to which the package use information will be added
     */
    protected void addPackageUse(Content contentTree) {
        Content content = new ContentBuilder();
        if (configuration.packages.size() > 1) {
            addPackageList(content);
        }
        addClassList(content);
        contentTree.add(content);
    }

    
Add the list of packages that use the given package.
Params:
contentTree – the content tree to which the package list will be added/**
     * Add the list of packages that use the given package.
     *
     * @param contentTree the content tree to which the package list will be added
     */
    protected void addPackageList(Content contentTree) {
        Content caption = contents.getContent(
                "doclet.ClassUse_Packages.that.use.0",
                getPackageLink(packageElement, utils.getPackageName(packageElement)));
        Table table = new Table(HtmlStyle.useSummary)
                .setCaption(caption)
                .setHeader(getPackageTableHeader())
                .setColumnStyles(HtmlStyle.colFirst, HtmlStyle.colLast);
        for (String pkgname: usingPackageToUsedClasses.keySet()) {
            PackageElement pkg = utils.elementUtils.getPackageElement(pkgname);
            Content packageLink = links.createLink(getPackageAnchorName(pkg),
                    new StringContent(utils.getPackageName(pkg)));
            Content summary = new ContentBuilder();
            if (pkg != null && !pkg.isUnnamed()) {
                addSummaryComment(pkg, summary);
            } else {
                summary.add(Entity.NO_BREAK_SPACE);
            }
            table.addRow(packageLink, summary);
        }
        contentTree.add(table.toContent());
    }

    
Add the list of classes that use the given package.
Params:
contentTree – the content tree to which the class list will be added/**
     * Add the list of classes that use the given package.
     *
     * @param contentTree the content tree to which the class list will be added
     */
    protected void addClassList(Content contentTree) {
        TableHeader classTableHeader = new TableHeader(
                contents.classLabel, contents.descriptionLabel);
        HtmlTree ul = new HtmlTree(HtmlTag.UL);
        ul.setStyle(HtmlStyle.blockList);
        for (String packageName : usingPackageToUsedClasses.keySet()) {
            PackageElement usingPackage = utils.elementUtils.getPackageElement(packageName);
            HtmlTree section = HtmlTree.SECTION(HtmlStyle.detail);
            section.add(links.createAnchor(getPackageAnchorName(usingPackage)));
            String tableSummary = resources.getText("doclet.Use_Table_Summary",
                                                        resources.getText("doclet.classes"));
            Content caption = contents.getContent(
                    "doclet.ClassUse_Classes.in.0.used.by.1",
                    getPackageLink(packageElement, utils.getPackageName(packageElement)),
                    getPackageLink(usingPackage, utils.getPackageName(usingPackage)));
            Table table = new Table(HtmlStyle.useSummary)
                    .setCaption(caption)
                    .setHeader(classTableHeader)
                    .setColumnStyles(HtmlStyle.colFirst, HtmlStyle.colLast);
            for (TypeElement te : usingPackageToUsedClasses.get(packageName)) {
                DocPath dp = pathString(te,
                        DocPaths.CLASS_USE.resolve(docPaths.forName(te)));
                Content stringContent = new StringContent(utils.getSimpleName(te));
                Content typeContent = links.createLink(dp.fragment(getPackageAnchorName(usingPackage)),
                        stringContent);
                Content summary = new ContentBuilder();
                addIndexComment(te, summary);

                table.addRow(typeContent, summary);
            }
            section.add(table.toContent());
            ul.add(HtmlTree.LI(HtmlStyle.blockList, section));
        }
        Content li = HtmlTree.SECTION(HtmlStyle.packageUses, ul);
        contentTree.add(li);
    }

    
Get the header for the package use listing.
Returns:
a content tree representing the package use header/**
     * Get the header for the package use listing.
     *
     * @return a content tree representing the package use header
     */
    private HtmlTree getPackageUseHeader() {
        String packageText = resources.getText("doclet.Package");
        String name = packageElement.isUnnamed() ? "" : utils.getPackageName(packageElement);
        String title = resources.getText("doclet.Window_ClassUse_Header", packageText, name);
        HtmlTree bodyTree = getBody(getWindowTitle(title));
        Content headerContent = new ContentBuilder();
        addTop(headerContent);
        Content linkContent = getModuleLink(utils.elementUtils.getModuleOf(packageElement),
                contents.moduleLabel);
        navBar.setNavLinkModule(linkContent);
        navBar.setUserHeader(getUserHeaderFooter(true));
        headerContent.add(navBar.getContent(true));
        ContentBuilder headingContent = new ContentBuilder();
        headingContent.add(contents.getContent("doclet.ClassUse_Title", packageText));
        headingContent.add(new HtmlTree(HtmlTag.BR));
        headingContent.add(name);
        Content heading = HtmlTree.HEADING(Headings.PAGE_TITLE_HEADING, true,
                HtmlStyle.title, headingContent);
        Content div = HtmlTree.DIV(HtmlStyle.header, heading);
        bodyContents.setHeader(headerContent)
                .addMainContent(div);
        return bodyTree;
    }
}