Application: gvSIG desktop » gvSIG scripting

package org.gvsig.scripting.impl;

import com.sun.java.help.search.Indexer;

import java.io.File;

import java.io.IOException;

import java.lang.reflect.Field;

import java.util.Hashtable;

import java.util.logging.Level;

import org.apache.commons.io.FileUtils;

import org.apache.commons.lang3.StringUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public class IndexerHelper {

    protected static final Logger logger = LoggerFactory.getLogger(IndexerHelper.class);

    protected static Indexer indexer;

    public IndexerHelper() {

    }

    /**

     * Repeated invokation of the javahelp indexer (possibly via multiple

     * classloaders) is causing trouble, residue from previous invokations seems

     * to cause errors this is a nasty workaround for the problem. alternatively

     * we could try invoking the indexer from a separate jvm i guess, ut that's

     * more work.

     *

     */

    public void ClearStaticFieldsInJavaHelpIndexer() {

        if (indexer == null) {

            return;

        }

        try {

            Class<?> clazz = Class.forName("com.sun.java.help.search.Indexer");

            Field fld = clazz.getDeclaredField("kitRegistry");

            fld.setAccessible(true);

            Hashtable<?, ?> hash = (Hashtable<?, ?>) fld.get(null);

            hash.clear();

            clazz = Class.forName("com.sun.java.help.search.HTMLIndexerKit");

            fld = clazz.getDeclaredField("defaultParser");

            fld.setAccessible(true);

            fld.set(null, null);

            fld = clazz.getDeclaredField("defaultCallback");

            fld.setAccessible(true);

            fld.set(null, null);

        } catch (Exception ex) {

            logger.warn("Can't clear indexer", ex);

        }

    }

    private Indexer getIndexer() {

        if (indexer == null) {

            indexer = new Indexer();

        }

        return indexer;

    }

    public void index(File config, File searchdb, File docs) {

            /*

            https://docs.oracle.com/cd/E19253-01/819-0913/author/jhindexer.html

            Usage:   java JavaHelp.Index options file ...

            Options: -c file   config file

            -db file  generated database file name

            -verbose  verbose documentation

            -nostopwords ignore stop words

            -locale language_country_variant

            -logfile log file name

            Note: config file composition:

            IndexRemove /public_html/JavaHelp/demo

            IndexPrepend ..

            StopWords word1 ... wordN

            StopWordsFile stopWordFileName

            File /public_html/JavaHelp/demo/first.html

            File=/public_html/JavaHelp/demo/second.html

            ...

            */

        try {

            FileUtils.write(config,

                    "IndexRemove " + docs.getAbsolutePath() + "\n"

            );

        } catch (IOException ex) {

            logger.warn("Can't create indexer config file in '"+config.getAbsolutePath()+"'.",ex);

        }

        String[] args = new String[]{

            //"-verbose",

            "-c",

            config.getAbsolutePath(),

            "-db",

            searchdb.getAbsolutePath() + "/",

            docs.getAbsolutePath() + "/"

        };

        ClearStaticFieldsInJavaHelpIndexer();

        try {

            logger.info("Start indexing help, args: '"+StringUtils.join(args, ", ")+"'.");

            this.getIndexer().compile(args);

            logger.info("End indexing help, args: '"+StringUtils.join(args, ", ")+"'.");

        } catch (Exception e) {

            logger.info("Can't index help ('" + args + "').", e);

        }

    }

}