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

Introduction

Here is the source code for com.mathworks.xzheng.tools.BerkeleyDbJESearcher.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 com.sleepycat.je.Environment;
import com.sleepycat.je.EnvironmentConfig;
import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseConfig;
import com.sleepycat.je.DatabaseException;

import org.apache.lucene.index.Term;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.je.JEDirectory;

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

// From chapter 9
public class BerkeleyDbJESearcher {
    public static void main(String[] args) throws IOException, DatabaseException {
        if (args.length != 1) {
            System.err.println("Usage: BerkeleyDbSearcher <index dir>");
            System.exit(-1);
        }
        File indexFile = new File(args[0]);

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

        envConfig.setTransactional(true);
        envConfig.setAllowCreate(true);
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(true);

        Environment env = new Environment(indexFile, envConfig);

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

        JEDirectory directory = new JEDirectory(null, index, blocks);

        IndexSearcher searcher = new IndexSearcher(directory, true);
        TopDocs hits = searcher.search(new TermQuery(new Term("contents", "fox")), 10);
        System.out.println(hits.totalHits + " documents found");

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