/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

package com.sun.tools.doclets.internal.toolkit.builders;

import com.sun.tools.doclets.internal.toolkit.util.*;

import com.sun.tools.doclets.internal.toolkit.*;

import com.sun.javadoc.*;

import java.io.*;

import java.util.*;

import java.lang.reflect.*;

/**

 * Builds the Constants Summary Page.

 *

 * This code is not part of an API.

 * It is implementation that is subject to change.

 * Do not use it as an API

 *

 * @author Jamie Ho

 * @since 1.5

 */

public class ConstantsSummaryBuilder extends AbstractBuilder {

    /**

     * The root element of the constant summary XML is {@value}.

     */

    public static final String ROOT = "ConstantSummary";

    /**

     * The maximum number of package directories shown in the constant

     * value index.

     */

    public static final int MAX_CONSTANT_VALUE_INDEX_LENGTH = 2;

    /**

     * The writer used to write the results.

     */

    protected ConstantsSummaryWriter writer;

    /**

     * The set of ClassDocs that have constant fields.

     */

    protected Set<ClassDoc> classDocsWithConstFields;

    /**

     * The set of printed package headers.

     */

    protected Set<String> printedPackageHeaders;

    /**

     * The current package being documented.

     */

    private PackageDoc currentPackage;

    /**

     * The current class being documented.

     */

    private ClassDoc currentClass;

    /**

     * Construct a new ConstantsSummaryBuilder.

     *

     * @param configuration the current configuration of the

     *                      doclet.

     */

    private ConstantsSummaryBuilder(Configuration configuration) {

        super(configuration);

    }

    /**

     * Construct a ConstantsSummaryBuilder.

     *

     * @param configuration the configuration used in this run

     *                      of the doclet.

     * @param writer        the writer for the summary.

     */

    public static ConstantsSummaryBuilder getInstance(

        Configuration configuration, ConstantsSummaryWriter writer) {

        ConstantsSummaryBuilder builder = new ConstantsSummaryBuilder(

            configuration);

        builder.writer = writer;

        builder.classDocsWithConstFields = new HashSet<ClassDoc>();

        return builder;

    }

    /**

     * {@inheritDoc}

     */

    public void invokeMethod(String methodName, Class<?>[] paramClasses,

            Object[] params)

    throws Exception {

        if (DEBUG) {

            configuration.root.printError("DEBUG: " + this.getClass().getName()

                + "." + methodName);

        }

        Method method = this.getClass().getMethod(methodName, paramClasses);

        method.invoke(this, params);

    }

    /**

     * {@inheritDoc}

     */

    public void build() throws IOException {

        if (writer == null) {

            //Doclet does not support this output.

            return;

        }

        build(LayoutParser.getInstance(configuration).parseXML(ROOT));

    }

    /**

     * {@inheritDoc}

     */

    public String getName() {

        return ROOT;

    }

    /**

     * Build the constant summary.

     *

     * @param elements the list of elements describing constant summary

     *                 documentation.

     */

    public void buildConstantSummary(List<?> elements) throws Exception {

        build(elements);

        writer.close();

    }

    /**

     * Build the header.

     */

    public void buildHeader() {

        writer.writeHeader();

    }

    /**

     * Build the footer.

     */

    public void buildFooter() {

        writer.writeFooter();

    }

    /**

     * Build the table of contents.

     */

    public void buildContents() {

        writer.writeContentsHeader();

        PackageDoc[] packages = configuration.packages;

        printedPackageHeaders = new HashSet<String>();

        for (int i = 0; i < packages.length; i++) {

            if (hasConstantField(packages[i]) && ! hasPrintedPackageIndex(packages[i].name())) {

                writer.writeLinkToPackageContent(packages[i],

                    parsePackageName(packages[i].name()),

                    printedPackageHeaders);

            }

        }

        writer.writeContentsFooter();

    }

    /**

     * Build the summary for each documented package.

     *

     * @param elements the XML elements that represent the components

     *                 of documentation for each package.

     */

    public void buildConstantSummaries(List<?> elements) {

        PackageDoc[] packages = configuration.packages;

        printedPackageHeaders = new HashSet<String>();

        for (int i = 0; i < packages.length; i++) {

            if (hasConstantField(packages[i])) {

                currentPackage = packages[i];

                //Build the documentation for the current package.

                build(elements);

            }

        }

    }

    /**

     * Build the summary for the current package.

     *

     * @param elements the list of XML elements that make up package

     *                 documentation.

     */

    public void buildPackageConstantSummary(List<?> elements) {

        build(elements);

    }

    /**

     * Build the summary for the current class.

     *

     * @param elements the list of XML elements that make up the class

     *                 constant summary.

     */

    public void buildClassConstantSummary(List<?> elements) {

        ClassDoc[] classes = currentPackage.name().length() > 0 ?

            currentPackage.allClasses() :

            configuration.classDocCatalog.allClasses(

                DocletConstants.DEFAULT_PACKAGE_NAME);

        Arrays.sort(classes);

        for (int i = 0; i < classes.length; i++) {

            if (! classDocsWithConstFields.contains(classes[i]) ||

                ! classes[i].isIncluded()) {

                continue;

            }

            currentClass = classes[i];

            //Build the documentation for the current class.

            build(elements);

        }

    }

    /**

     * Build the header for the given class.

     */

    public void buildPackageHeader() {

        String parsedPackageName = parsePackageName(currentPackage.name());

        if (! printedPackageHeaders.contains(parsedPackageName)) {

            writer.writePackageName(currentPackage,

                parsePackageName(currentPackage.name()));

            printedPackageHeaders.add(parsedPackageName);

        }

    }

    /**

     * Build the header for the given class.

     */

    public void buildClassHeader() {

        writer.writeConstantMembersHeader(currentClass);

    }

    /**

     * Print summary of constant members in the

     * class.

     */

    public void buildConstantMembers() {

        new ConstantFieldBuilder(currentClass).buildMembersSummary();

    }

    /**

     * Build the footer for the given class.

     */

    public void buildClassFooter() {

        writer.writeConstantMembersFooter(currentClass);

    }

    /**

     * Return true if the given package has constant fields to document.

     *

     * @param pkg   the package being checked.

     * @return true if the given package has constant fields to document.

     */

    private boolean hasConstantField(PackageDoc pkg) {

        ClassDoc[] classes;

        if (pkg.name().length() > 0) {

            classes = pkg.allClasses();

        } else {

            classes = configuration.classDocCatalog.allClasses(

                DocletConstants.DEFAULT_PACKAGE_NAME);

        }

        boolean found = false;

        for (int j = 0; j < classes.length; j++){

            if (classes[j].isIncluded() && hasConstantField(classes[j])) {

                found = true;

            }

        }

        return found;

    }

    /**

     * Return true if the given class has constant fields to document.

     *

     * @param classDoc the class being checked.

     * @return true if the given package has constant fields to document.

     */

    private boolean hasConstantField (ClassDoc classDoc) {

        VisibleMemberMap visibleMemberMapFields = new VisibleMemberMap(classDoc,

            VisibleMemberMap.FIELDS, configuration.nodeprecated);

        List<?> fields = visibleMemberMapFields.getLeafClassMembers(configuration);

        for (Iterator<?> iter = fields.iterator(); iter.hasNext(); ) {

            FieldDoc field = (FieldDoc) iter.next();

            if (field.constantValueExpression() != null) {

                classDocsWithConstFields.add(classDoc);

                return true;

            }

        }

        return false;

    }

    /**

     * Return true if the given package name has been printed.  Also

     * return true if the root of this package has been printed.

     *

     * @param pkgname the name of the package to check.

     */

    private boolean hasPrintedPackageIndex(String pkgname) {

        String[] list = printedPackageHeaders.toArray(new String[] {});

        for (int i = 0; i < list.length; i++) {

            if (pkgname.startsWith(list[i])) {

                return true;

            }

        }

        return false;

    }

    /**

     * Print the table of constants.

     *

     * @author Jamie Ho

     * @since 1.4

     */

    private class ConstantFieldBuilder {

        /**

         * The map used to get the visible variables.

         */

        protected VisibleMemberMap visibleMemberMapFields = null;

        /**

         * The map used to get the visible variables.

         */

        protected VisibleMemberMap visibleMemberMapEnumConst = null;

        /**

         * The classdoc that we are examining constants for.

         */

        protected ClassDoc classdoc;

        /**

         * Construct a ConstantFieldSubWriter.

         * @param classdoc the classdoc that we are examining constants for.

         */

        public ConstantFieldBuilder(ClassDoc classdoc) {

            this.classdoc = classdoc;

            visibleMemberMapFields = new VisibleMemberMap(classdoc,

                VisibleMemberMap.FIELDS, configuration.nodeprecated);

            visibleMemberMapEnumConst = new VisibleMemberMap(classdoc,

                VisibleMemberMap.ENUM_CONSTANTS, configuration.nodeprecated);

        }

        /**

         * Builds the table of constants for a given class.

         */

        protected void buildMembersSummary() {

            List<FieldDoc> members = new ArrayList<FieldDoc>(members());

            if (members.size() > 0) {

                Collections.sort(members);

                writer.writeConstantMembers(classdoc, members);

            }

        }

        /**

         * Return the list of visible constant fields for the given classdoc.

         * @param cd the classdoc to examine.

         * @return the list of visible constant fields for the given classdoc.

         */

        protected List<FieldDoc> members() {

            List<ProgramElementDoc> l = visibleMemberMapFields.getLeafClassMembers(configuration);

            l.addAll(visibleMemberMapEnumConst.getLeafClassMembers(configuration));

            Iterator<ProgramElementDoc> iter;

            if(l != null){

                iter = l.iterator();

            } else {

                return null;

            }

            List<FieldDoc> inclList = new LinkedList<FieldDoc>();

            FieldDoc member;

            while(iter.hasNext()){

                member = (FieldDoc)iter.next();

                if(member.constantValue() != null){

                    inclList.add(member);

                }

            }

            return inclList;

        }

    }

    /**

     * Parse the package name.  We only want to display package name up to

     * 2 levels.

     */

    private String parsePackageName(String pkgname) {

        int index = -1;

        for (int j = 0; j < MAX_CONSTANT_VALUE_INDEX_LENGTH; j++) {

            index = pkgname.indexOf(".", index + 1);

        }

        if (index != -1) {

            pkgname = pkgname.substring(0, index);

        }

        return pkgname;

    }

}