com.mathworks.xzheng.tools.BerkeleyDbIndexer.java Source code

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Here is the source code for com.mathworks.xzheng.tools.BerkeleyDbIndexer.java

Source

package com.mathworks.xzheng.tools;

/**
 * Copyright Manning Publications Co.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific lan      
*/

import java.io.File;
import java.io.IOException;

import com.sleepycat.je.*;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.util.Version;
import org.omg.CORBA.Environment;

// From chapter 9
public class BerkeleyDbIndexer {
    public static void main(String[] args) throws IOException, DatabaseException {
        if (args.length != 1) {
            System.err.println("Usage: BerkeleyDbIndexer <index dir>");
            System.exit(-1);
        }

        File indexFile = new File(args[0]);

        if (indexFile.exists()) {
            File[] files = indexFile.listFiles();

            for (int i = 0; i < files.length; i++)
                if (files[i].getName().startsWith("__"))
                    files[i].delete();
            indexFile.delete();
        }

        indexFile.mkdir();

        EnvironmentConfig envConfig = new EnvironmentConfig();
        DatabaseConfig dbConfig = new DatabaseConfig();

        envConfig.setTransactional(true);
        envConfig.setInitializeCache(true);
        envConfig.setInitializeLocking(true);
        envConfig.setInitializeLogging(true);
        envConfig.setAllowCreate(true);
        envConfig.setThreaded(true);
        dbConfig.setAllowCreate(true);
        dbConfig.setType(DatabaseType.BTREE);

        Environment env = new Environment(indexFile, envConfig);

        Transaction txn = env.beginTransaction(null, null);
        Database index = env.openDatabase(txn, "__index__", null, dbConfig);
        Database blocks = env.openDatabase(txn, "__blocks__", null, dbConfig);
        txn.commit();

        txn = env.beginTransaction(null, null);
        DbDirectory directory = new DbDirectory(txn, index, blocks);

        IndexWriter writer = new IndexWriter(directory, new StandardAnalyzer(Version.LUCENE_46), true,
                IndexWriter.MaxFieldLength.UNLIMITED);

        Document doc = new Document();
        doc.add(new Field("contents", "The quick brown fox...", Field.Store.YES, Field.Index.ANALYZED));
        writer.addDocument(doc);

        writer.optimize();
        writer.close();

        directory.close();
        txn.commit();

        index.close();
        blocks.close();
        env.close();

        System.out.println("Indexing Complete");
    }
}