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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
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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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 * 2 along with this work; if not, write to the Free Software Foundation,
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package jdk.javadoc.internal.doclets.formats.html;

import java.io.*;
import java.util.*;
import java.util.zip.*;

import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.ModuleElement;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.SimpleElementVisitor9;

import com.sun.source.doctree.DocTree;
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.DocFile;
import jdk.javadoc.internal.doclets.toolkit.util.DocFileIOException;
import jdk.javadoc.internal.doclets.toolkit.util.DocPath;
import jdk.javadoc.internal.doclets.toolkit.util.DocPaths;
import jdk.javadoc.internal.doclets.toolkit.util.IndexBuilder;

Generate Index for all the Member Names with Indexing in Unicode Order. This class is a base class for SingleIndexWriter and SplitIndexWriter. It uses the functionality from HtmlDocletWriter to generate the Index Contents. 
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:
Atul M Dambalkar, Bhavesh Patel (Modified)
See Also:
IndexBuilder/**
 * Generate Index for all the Member Names with Indexing in
 * Unicode Order. This class is a base class for {@link SingleIndexWriter} and
 * {@link SplitIndexWriter}. It uses the functionality from
 * {@link HtmlDocletWriter} to generate the Index Contents.
 *
 *  <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>
 *
 * @see    IndexBuilder
 * @author Atul M Dambalkar
 * @author Bhavesh Patel (Modified)
 */
public class AbstractIndexWriter extends HtmlDocletWriter {

    
The index of all the members with unicode character.
/**
     * The index of all the members with unicode character.
     */
    protected IndexBuilder indexbuilder;

    
This constructor will be used by SplitIndexWriter. Initializes path to this file and relative path from this file. 
Params:
configuration –  The current configuration
path –       Path to the file which is getting generated.
indexbuilder – Unicode based Index from IndexBuilder/**
     * This constructor will be used by {@link SplitIndexWriter}. Initializes
     * path to this file and relative path from this file.
     *
     * @param configuration  The current configuration
     * @param path       Path to the file which is getting generated.
     * @param indexbuilder Unicode based Index from {@link IndexBuilder}
     */
    protected AbstractIndexWriter(ConfigurationImpl configuration,
                                  DocPath path,
                                  IndexBuilder indexbuilder) {
        super(configuration, path);
        this.indexbuilder = indexbuilder;
    }

    
Get the index label for navigation bar.
Returns:
a content tree for the tree label/**
     * Get the index label for navigation bar.
     *
     * @return a content tree for the tree label
     */
    @Override
    protected Content getNavLinkIndex() {
        Content li = HtmlTree.LI(HtmlStyle.navBarCell1Rev, contents.indexLabel);
        return li;
    }

    
Add the member information for the unicode character along with the
list of the members.
Params:
uc – Unicode for which member list information to be generated
memberlist – List of members for the unicode character
contentTree – the content tree to which the information will be added/**
     * Add the member information for the unicode character along with the
     * list of the members.
     *
     * @param uc Unicode for which member list information to be generated
     * @param memberlist List of members for the unicode character
     * @param contentTree the content tree to which the information will be added
     */
    protected void addContents(Character uc, Collection<? extends Element> memberlist,
            Content contentTree) {
        addHeading(uc, contentTree);
        // Display the list only if there are elements to be displayed.
        if (!memberlist.isEmpty()) {
            Content dl = new HtmlTree(HtmlTag.DL);
            for (Element element : memberlist) {
                addDescription(dl, element);
            }
            contentTree.addContent(dl);
        }
    }

    protected void addSearchContents(Character uc, List<SearchIndexItem> searchList,
            Content contentTree) {
        addHeading(uc, contentTree);
        // Display the list only if there are elements to be displayed.
        if (!searchList.isEmpty()) {
            Content dl = new HtmlTree(HtmlTag.DL);
            for (SearchIndexItem sii : searchList) {
                addDescription(sii, dl);
            }
            contentTree.addContent(dl);
        }
    }

    protected void addContents(Character uc, List<? extends Element> memberlist,
            List<SearchIndexItem> searchList, Content contentTree) {
        addHeading(uc, contentTree);
        int memberListSize = memberlist.size();
        int searchListSize = searchList.size();
        int i = 0;
        int j = 0;
        Content dl = new HtmlTree(HtmlTag.DL);
        while (i < memberListSize && j < searchListSize) {
            Element elem = memberlist.get(i);
            String name = (utils.isModule(elem))
                    ? utils.getFullyQualifiedName(elem) : utils.getSimpleName(elem);
            if (name.compareTo(searchList.get(j).getLabel()) < 0) {
                addDescription(dl, memberlist.get(i));
                i++;
            } else if (name.compareTo(searchList.get(j).getLabel()) > 0) {
                addDescription(searchList.get(j), dl);
                j++;
            } else {
                addDescription(dl, memberlist.get(i));
                addDescription(searchList.get(j), dl);
                j++;
                i++;
            }
        }
        if (i >= memberListSize) {
            while (j < searchListSize) {
                addDescription(searchList.get(j), dl);
                j++;
            }
        }
        if (j >= searchListSize) {
            while (i < memberListSize) {
                addDescription(dl, memberlist.get(i));
                i++;
            }
        }
        contentTree.addContent(dl);
    }

    protected void addHeading(Character uc, Content contentTree) {
        String unicode = uc.toString();
        contentTree.addContent(getMarkerAnchorForIndex(unicode));
        Content headContent = new StringContent(unicode);
        Content heading = HtmlTree.HEADING(HtmlConstants.CONTENT_HEADING, false,
                HtmlStyle.title, headContent);
        contentTree.addContent(heading);
    }

    protected void addDescription(Content dl, Element element) {
        SearchIndexItem si = new SearchIndexItem();
        new SimpleElementVisitor9<Void, Void>() {

            @Override
            public Void visitModule(ModuleElement e, Void p) {
                if (configuration.showModules) {
                    addDescription(e, dl, si);
                    configuration.moduleSearchIndex.add(si);
                }
                return null;
            }

            @Override
            public Void visitPackage(PackageElement e, Void p) {
                addDescription(e, dl, si);
                configuration.packageSearchIndex.add(si);
                return null;
            }

            @Override
            public Void visitType(TypeElement e, Void p) {
                addDescription(e, dl, si);
                configuration.typeSearchIndex.add(si);
                return null;
            }

            @Override
            protected Void defaultAction(Element e, Void p) {
                addDescription(e, dl, si);
                configuration.memberSearchIndex.add(si);
                return null;
            }

        }.visit(element);
    }

    
Add one line summary comment for the module.
Params:
mdle – the module to be documented
dlTree – the content tree to which the description will be added/**
     * Add one line summary comment for the module.
     *
     * @param mdle the module to be documented
     * @param dlTree the content tree to which the description will be added
     */
    protected void addDescription(ModuleElement mdle, Content dlTree, SearchIndexItem si) {
        String moduleName = utils.getFullyQualifiedName(mdle);
        Content link = getModuleLink(mdle, new StringContent(moduleName));
        si.setLabel(moduleName);
        si.setCategory(resources.getText("doclet.Modules"));
        Content dt = HtmlTree.DT(link);
        dt.addContent(" - ");
        dt.addContent(contents.module_);
        dt.addContent(" " + moduleName);
        dlTree.addContent(dt);
        Content dd = new HtmlTree(HtmlTag.DD);
        addSummaryComment(mdle, dd);
        dlTree.addContent(dd);
    }

    
Add one line summary comment for the package.
Params:
pkg – the package to be documented
dlTree – the content tree to which the description will be added
si – the search index item to be updated/**
     * Add one line summary comment for the package.
     *
     * @param pkg the package to be documented
     * @param dlTree the content tree to which the description will be added
     * @param si the search index item to be updated
     */
    protected void addDescription(PackageElement pkg, Content dlTree, SearchIndexItem si) {
        Content link = getPackageLink(pkg, new StringContent(utils.getPackageName(pkg)));
        if (configuration.showModules) {
            si.setContainingModule(utils.getFullyQualifiedName(utils.containingModule(pkg)));
        }
        si.setLabel(utils.getPackageName(pkg));
        si.setCategory(resources.getText("doclet.Packages"));
        Content dt = HtmlTree.DT(link);
        dt.addContent(" - ");
        dt.addContent(contents.package_);
        dt.addContent(" " + utils.getPackageName(pkg));
        dlTree.addContent(dt);
        Content dd = new HtmlTree(HtmlTag.DD);
        addSummaryComment(pkg, dd);
        dlTree.addContent(dd);
    }

    
Add one line summary comment for the class.
Params:
typeElement – the class being documented
dlTree – the content tree to which the description will be added
si – the search index item to be updated/**
     * Add one line summary comment for the class.
     *
     * @param typeElement the class being documented
     * @param dlTree the content tree to which the description will be added
     * @param si the search index item to be updated
     */
    protected void addDescription(TypeElement typeElement, Content dlTree, SearchIndexItem si) {
        Content link = getLink(new LinkInfoImpl(configuration,
                        LinkInfoImpl.Kind.INDEX, typeElement).strong(true));
        si.setContainingPackage(utils.getPackageName(utils.containingPackage(typeElement)));
        si.setLabel(utils.getSimpleName(typeElement));
        si.setCategory(resources.getText("doclet.Types"));
        Content dt = HtmlTree.DT(link);
        dt.addContent(" - ");
        addClassInfo(typeElement, dt);
        dlTree.addContent(dt);
        Content dd = new HtmlTree(HtmlTag.DD);
        addComment(typeElement, dd);
        dlTree.addContent(dd);
    }

    
Add the classkind (class, interface, exception), error of the class
passed.
Params:
te – the class being documented
contentTree – the content tree to which the class info will be added/**
     * Add the classkind (class, interface, exception), error of the class
     * passed.
     *
     * @param te the class being documented
     * @param contentTree the content tree to which the class info will be added
     */
    protected void addClassInfo(TypeElement te, Content contentTree) {
        contentTree.addContent(contents.getContent("doclet.in",
                utils.getTypeElementName(te, false),
                getPackageLink(utils.containingPackage(te),
                    utils.getPackageName(utils.containingPackage(te)))
                ));
    }

    
Add description for Class, Field, Method or Constructor.
Params:
member – the member of the Class Kind
dlTree – the content tree to which the description will be added
si – search index item/**
     * Add description for Class, Field, Method or Constructor.
     *
     * @param member the member of the Class Kind
     * @param dlTree the content tree to which the description will be added
     * @param si search index item
     */
    protected void addDescription(Element member, Content dlTree, SearchIndexItem si) {

        si.setContainingPackage(utils.getPackageName(utils.containingPackage(member)));
        si.setContainingClass(utils.getSimpleName(utils.getEnclosingTypeElement(member)));
        String name = utils.getSimpleName(member);
        if (utils.isExecutableElement(member)) {
            ExecutableElement ee = (ExecutableElement)member;
            name = name + utils.flatSignature(ee);
            si.setLabel(name);
            if (!((utils.signature(ee)).equals(utils.flatSignature(ee)))) {
                si.setUrl(getName(getAnchor(ee)));
            }

        }  else {
            si.setLabel(name);
        }
        si.setCategory(resources.getText("doclet.Members"));
        Content span = HtmlTree.SPAN(HtmlStyle.memberNameLink,
                getDocLink(LinkInfoImpl.Kind.INDEX, member, name));
        Content dt = HtmlTree.DT(span);
        dt.addContent(" - ");
        addMemberDesc(member, dt);
        dlTree.addContent(dt);
        Content dd = new HtmlTree(HtmlTag.DD);
        addComment(member, dd);
        dlTree.addContent(dd);
    }

    protected void addDescription(SearchIndexItem sii, Content dlTree) {
        String siiPath = pathToRoot.isEmpty() ? "" : pathToRoot.getPath() + "/";
        siiPath += sii.getUrl();
        HtmlTree labelLink = HtmlTree.A(siiPath, new StringContent(sii.getLabel()));
        Content dt = HtmlTree.DT(HtmlTree.SPAN(HtmlStyle.searchTagLink, labelLink));
        dt.addContent(" - ");
        dt.addContent(contents.getContent("doclet.Search_tag_in", sii.getHolder()));
        dlTree.addContent(dt);
        Content dd = new HtmlTree(HtmlTag.DD);
        if (sii.getDescription().isEmpty()) {
            dd.addContent(Contents.SPACE);
        } else {
            dd.addContent(sii.getDescription());
        }
        dlTree.addContent(dd);
    }

    
Add comment for each element in the index. If the element is deprecated
and it has a @deprecated tag, use that comment. Else if the containing
class for this element is deprecated, then add the word "Deprecated." at
the start and then print the normal comment.
Params:
element – Index element
contentTree – the content tree to which the comment will be added/**
     * Add comment for each element in the index. If the element is deprecated
     * and it has a @deprecated tag, use that comment. Else if the containing
     * class for this element is deprecated, then add the word "Deprecated." at
     * the start and then print the normal comment.
     *
     * @param element Index element
     * @param contentTree the content tree to which the comment will be added
     */
    protected void addComment(Element element, Content contentTree) {
        List<? extends DocTree> tags;
        Content span = HtmlTree.SPAN(HtmlStyle.deprecatedLabel, getDeprecatedPhrase(element));
        HtmlTree div = new HtmlTree(HtmlTag.DIV);
        div.addStyle(HtmlStyle.block);
        if (utils.isDeprecated(element)) {
            div.addContent(span);
            tags = utils.getBlockTags(element, DocTree.Kind.DEPRECATED);
            if (!tags.isEmpty())
                addInlineDeprecatedComment(element, tags.get(0), div);
            contentTree.addContent(div);
        } else {
            TypeElement encl = utils.getEnclosingTypeElement(element);
            while (encl != null) {
                if (utils.isDeprecated(encl)) {
                    div.addContent(span);
                    contentTree.addContent(div);
                    break;
                }
                encl = utils.getEnclosingTypeElement(encl);
            }
            addSummaryComment(element, contentTree);
        }
    }

    
Add description about the Static Variable/Method/Constructor for a
member.
Params:
member – MemberDoc for the member within the Class Kind
contentTree – the content tree to which the member description will be added/**
     * Add description about the Static Variable/Method/Constructor for a
     * member.
     *
     * @param member MemberDoc for the member within the Class Kind
     * @param contentTree the content tree to which the member description will be added
     */
    protected void addMemberDesc(Element member, Content contentTree) {
        TypeElement containing = utils.getEnclosingTypeElement(member);
        String classdesc = utils.getTypeElementName(containing, true) + " ";
        if (utils.isField(member)) {
            Content resource = contents.getContent(utils.isStatic(member)
                    ? "doclet.Static_variable_in"
                    : "doclet.Variable_in", classdesc);
            contentTree.addContent(resource);
        } else if (utils.isConstructor(member)) {
            contentTree.addContent(
                    contents.getContent("doclet.Constructor_for", classdesc));
        } else if (utils.isMethod(member)) {
            Content resource = contents.getContent(utils.isStatic(member)
                    ? "doclet.Static_method_in"
                    : "doclet.Method_in", classdesc);
            contentTree.addContent(resource);
        }
        addPreQualifiedClassLink(LinkInfoImpl.Kind.INDEX, containing,
                false, contentTree);
    }

    
Get the marker anchor which will be added to the index documentation tree.
Params:
anchorNameForIndex – the anchor name attribute for index page
Returns:
a content tree for the marker anchor/**
     * Get the marker anchor which will be added to the index documentation tree.
     *
     * @param anchorNameForIndex the anchor name attribute for index page
     * @return a content tree for the marker anchor
     */
    public Content getMarkerAnchorForIndex(String anchorNameForIndex) {
        return getMarkerAnchor(getNameForIndex(anchorNameForIndex), null);
    }

    
Generate a valid HTML name for member index page.
Params:
unicode – the string that needs to be converted to valid HTML name.
Returns:
a valid HTML name string./**
     * Generate a valid HTML name for member index page.
     *
     * @param unicode the string that needs to be converted to valid HTML name.
     * @return a valid HTML name string.
     */
    public String getNameForIndex(String unicode) {
        return "I:" + getName(unicode);
    }

    
Throws:
DocFileIOException – if there is a problem creating any of the search index files/**
     * @throws DocFileIOException if there is a problem creating any of the search index files
     */
    protected void createSearchIndexFiles() throws DocFileIOException {
        if (configuration.showModules) {
            createSearchIndexFile(DocPaths.MODULE_SEARCH_INDEX_JSON, DocPaths.MODULE_SEARCH_INDEX_ZIP,
                    DocPaths.MODULE_SEARCH_INDEX_JS, configuration.moduleSearchIndex, "moduleSearchIndex");
        }
        createSearchIndexFile(DocPaths.PACKAGE_SEARCH_INDEX_JSON, DocPaths.PACKAGE_SEARCH_INDEX_ZIP,
                DocPaths.PACKAGE_SEARCH_INDEX_JS, configuration.packageSearchIndex, "packageSearchIndex");
        createSearchIndexFile(DocPaths.TYPE_SEARCH_INDEX_JSON, DocPaths.TYPE_SEARCH_INDEX_ZIP,
                DocPaths.TYPE_SEARCH_INDEX_JS, configuration.typeSearchIndex, "typeSearchIndex");
        createSearchIndexFile(DocPaths.MEMBER_SEARCH_INDEX_JSON, DocPaths.MEMBER_SEARCH_INDEX_ZIP,
                DocPaths.MEMBER_SEARCH_INDEX_JS, configuration.memberSearchIndex, "memberSearchIndex");
        createSearchIndexFile(DocPaths.TAG_SEARCH_INDEX_JSON, DocPaths.TAG_SEARCH_INDEX_ZIP,
                DocPaths.TAG_SEARCH_INDEX_JS, configuration.tagSearchIndex, "tagSearchIndex");
    }

    
Throws:
DocFileIOException – if there is a problem creating the search index file/**
     * @throws DocFileIOException if there is a problem creating the search index file
     */
    protected void createSearchIndexFile(DocPath searchIndexFile, DocPath searchIndexZip,
            DocPath searchIndexJS, List<SearchIndexItem> searchIndex, String varName) throws DocFileIOException {
        if (!searchIndex.isEmpty()) {
            StringBuilder searchVar = new StringBuilder("[");
            boolean first = true;
            for (SearchIndexItem item : searchIndex) {
                if (first) {
                    searchVar.append(item.toString());
                    first = false;
                } else {
                    searchVar.append(",").append(item.toString());
                }
            }
            searchVar.append("]");
            DocFile jsFile = DocFile.createFileForOutput(configuration, searchIndexJS);
            try (Writer wr = jsFile.openWriter()) {
                wr.write(varName);
                wr.write(" = ");
                wr.write(searchVar.toString());
            } catch (IOException ie) {
                throw new DocFileIOException(jsFile, DocFileIOException.Mode.WRITE, ie);
            }

            DocFile zipFile = DocFile.createFileForOutput(configuration, searchIndexZip);
            try (OutputStream fos = zipFile.openOutputStream();
                    ZipOutputStream zos = new ZipOutputStream(fos)) {
                try {
                    ZipEntry ze = new ZipEntry(searchIndexFile.getPath());
                    zos.putNextEntry(ze);
                    zos.write(searchVar.toString().getBytes());
                } finally {
                    zos.closeEntry();
                }
            } catch (IOException ie) {
                throw new DocFileIOException(zipFile, DocFileIOException.Mode.WRITE, ie);
            }
        }
    }
}