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

import java.util.*;

import javax.lang.model.element.TypeElement;

import jdk.javadoc.internal.doclets.formats.html.markup.HtmlStyle;
import jdk.javadoc.internal.doclets.formats.html.markup.TagName;
import jdk.javadoc.internal.doclets.formats.html.markup.HtmlTree;
import jdk.javadoc.internal.doclets.toolkit.Content;
import jdk.javadoc.internal.doclets.toolkit.util.ClassTree;
import jdk.javadoc.internal.doclets.toolkit.util.DocPath;


Abstract class to print the class hierarchy page for all the Classes. This is sub-classed by PackageTreeWriter and TreeWriter to generate the Package Tree and global Tree(for all the classes and packages) pages. 
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.
/**
 * Abstract class to print the class hierarchy page for all the Classes. This
 * is sub-classed by {@link PackageTreeWriter} and {@link TreeWriter} to
 * generate the Package Tree and global Tree(for all the classes and packages)
 * pages.
 *
 *  <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 abstract class AbstractTreeWriter extends HtmlDocletWriter {

    
The class and interface tree built by using ClassTree /**
     * The class and interface tree built by using {@link ClassTree}
     */
    protected final ClassTree classtree;

    
Constructor initializes classtree variable. This constructor will be used
while generating global tree file "overview-tree.html".
Params:
configuration –  The current configuration
filename –   File to be generated.
classtree –  Tree built by ClassTree./**
     * Constructor initializes classtree variable. This constructor will be used
     * while generating global tree file "overview-tree.html".
     *
     * @param configuration  The current configuration
     * @param filename   File to be generated.
     * @param classtree  Tree built by {@link ClassTree}.
     */
    protected AbstractTreeWriter(HtmlConfiguration configuration,
                                 DocPath filename, ClassTree classtree) {
        super(configuration, filename);
        this.classtree = classtree;
    }

    
Add each level of the class tree. For each sub-class or
sub-interface indents the next level information.
Recurses itself to add sub-classes info.
Params:
parent – the superclass or superinterface of the sset
collection –  a collection of the sub-classes at this level
isEnum – true if we are generating a tree for enums
contentTree – the content tree to which the level information will be added/**
     * Add each level of the class tree. For each sub-class or
     * sub-interface indents the next level information.
     * Recurses itself to add sub-classes info.
     *
     * @param parent the superclass or superinterface of the sset
     * @param collection  a collection of the sub-classes at this level
     * @param isEnum true if we are generating a tree for enums
     * @param contentTree the content tree to which the level information will be added
     */
    protected void addLevelInfo(TypeElement parent, Collection<TypeElement> collection,
            boolean isEnum, Content contentTree) {
        if (!collection.isEmpty()) {
            Content ul = new HtmlTree(TagName.UL);
            for (TypeElement local : collection) {
                HtmlTree li = new HtmlTree(TagName.LI);
                li.setStyle(HtmlStyle.circle);
                addPartialInfo(local, li);
                addExtendsImplements(parent, local, li);
                addLevelInfo(local, classtree.directSubClasses(local, isEnum),
                             isEnum, li);   // Recurse
                ul.add(li);
            }
            contentTree.add(ul);
        }
    }

    
Add the heading for the tree depending upon tree type if it's a
Class Tree or Interface tree.
Params:
sset – classes which are at the most base level, all the
other classes in this run will derive from these classes
heading – heading for the tree
content – the content tree to which the tree will be added/**
     * Add the heading for the tree depending upon tree type if it's a
     * Class Tree or Interface tree.
     *
     * @param sset classes which are at the most base level, all the
     * other classes in this run will derive from these classes
     * @param heading heading for the tree
     * @param content the content tree to which the tree will be added
     */
    protected void addTree(SortedSet<TypeElement> sset, String heading, Content content) {
        addTree(sset, heading, content, false);
    }

    protected void addTree(SortedSet<TypeElement> sset, String heading,
                           Content content, boolean isEnums) {
        if (!sset.isEmpty()) {
            TypeElement firstTypeElement = sset.first();
            Content headingContent = contents.getContent(heading);
            Content sectionHeading = HtmlTree.HEADING_TITLE(Headings.CONTENT_HEADING,
                    headingContent);
            HtmlTree htmlTree = HtmlTree.SECTION(HtmlStyle.hierarchy, sectionHeading);
            addLevelInfo(!utils.isInterface(firstTypeElement) ? firstTypeElement : null,
                    sset, isEnums, htmlTree);
            content.add(htmlTree);
        }
    }

    
Add information regarding the classes which this class extends or
implements.
Params:
parent – the parent class of the class being documented
typeElement – the TypeElement under consideration
contentTree – the content tree to which the information will be added/**
     * Add information regarding the classes which this class extends or
     * implements.
     *
     * @param parent the parent class of the class being documented
     * @param typeElement the TypeElement under consideration
     * @param contentTree the content tree to which the information will be added
     */
    protected void addExtendsImplements(TypeElement parent,
                                        TypeElement typeElement,
                                        Content contentTree)
    {
        SortedSet<TypeElement> interfaces = new TreeSet<>(comparators.makeGeneralPurposeComparator());
        typeElement.getInterfaces().forEach(t -> interfaces.add(utils.asTypeElement(t)));
        if (interfaces.size() > (utils.isInterface(typeElement) ? 1 : 0)) {
            boolean isFirst = true;
            for (TypeElement intf : interfaces) {
                if (parent != intf) {
                    if (utils.isPublic(intf) || utils.isLinkable(intf)) {
                        if (isFirst) {
                            isFirst = false;
                            if (utils.isInterface(typeElement)) {
                                contentTree.add(" (");
                                contentTree.add(contents.also);
                                contentTree.add(" extends ");
                            } else {
                                contentTree.add(" (implements ");
                            }
                        } else {
                            contentTree.add(", ");
                        }
                        addPreQualifiedClassLink(LinkInfoImpl.Kind.TREE, intf, contentTree);
                    }
                }
            }
            if (!isFirst) {
                contentTree.add(")");
            }
        }
    }

    
Add information about the class kind, if it's a "class" or "interface".
Params:
typeElement – the class being documented
contentTree – the content tree to which the information will be added/**
     * Add information about the class kind, if it's a "class" or "interface".
     *
     * @param typeElement the class being documented
     * @param contentTree the content tree to which the information will be added
     */
    protected void addPartialInfo(TypeElement typeElement, Content contentTree) {
        addPreQualifiedStrongClassLink(LinkInfoImpl.Kind.TREE, typeElement, contentTree);
    }
}