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Lucene example source code file (ExtractWikipedia.java)

This example Lucene source code file (ExtractWikipedia.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

base, base, docmaker, exception, extractwikipedia, extractwikipedia, file, file, filewriter, io, ioexception, properties, string, string, stringbuilder, util

The Lucene ExtractWikipedia.java source code

package org.apache.lucene.benchmark.utils;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 language governing permissions and
 * limitations under the License.
 */

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Properties;

import org.apache.lucene.benchmark.byTask.feeds.DocMaker;
import org.apache.lucene.benchmark.byTask.feeds.NoMoreDataException;
import org.apache.lucene.benchmark.byTask.utils.Config;
import org.apache.lucene.document.Document;

/**
 * Extract the downloaded Wikipedia dump into separate files for indexing.
 */
public class ExtractWikipedia {

  private File outputDir;

  static public int count = 0;

  static final int BASE = 10;
  protected DocMaker docMaker;

  public ExtractWikipedia(DocMaker docMaker, File outputDir) {
    this.outputDir = outputDir;
    this.docMaker = docMaker;
    System.out.println("Deleting all files in " + outputDir);
    File[] files = outputDir.listFiles();
    for (int i = 0; i < files.length; i++) {
      files[i].delete();
    }
  }

  public File directory(int count, File directory) {
    if (directory == null) {
      directory = outputDir;
    }
    int base = BASE;
    while (base <= count) {
      base *= BASE;
    }
    if (count < BASE) {
      return directory;
    }
    directory = new File(directory, (Integer.toString(base / BASE)));
    directory = new File(directory, (Integer.toString(count / (base / BASE))));
    return directory(count % (base / BASE), directory);
  }

  public void create(String id, String title, String time, String body) {

    File d = directory(count++, null);
    d.mkdirs();
    File f = new File(d, id + ".txt");

    StringBuilder contents = new StringBuilder();

    contents.append(time);
    contents.append("\n\n");
    contents.append(title);
    contents.append("\n\n");
    contents.append(body);
    contents.append("\n");

    try {
      FileWriter writer = new FileWriter(f);
      writer.write(contents.toString());
      writer.close();
    } catch (IOException ioe) {
      throw new RuntimeException(ioe);
    }

  }

  public void extract() throws Exception {
    Document doc = null;
    System.out.println("Starting Extraction");
    long start = System.currentTimeMillis();
    try {
      while ((doc = docMaker.makeDocument()) != null) {
        create(doc.get(DocMaker.ID_FIELD), doc.get(DocMaker.TITLE_FIELD), doc
            .get(DocMaker.DATE_FIELD), doc.get(DocMaker.BODY_FIELD));
      }
    } catch (NoMoreDataException e) {
      //continue
    }
    long finish = System.currentTimeMillis();
    System.out.println("Extraction took " + (finish - start) + " ms");
  }

  public static void main(String[] args) throws Exception {

    File wikipedia = null;
    File outputDir = new File("./enwiki");
    boolean keepImageOnlyDocs = true;
    for (int i = 0; i < args.length; i++) {
      String arg = args[i];
      if (arg.equals("--input") || arg.equals("-i")) {
        wikipedia = new File(args[i + 1]);
        i++;
      } else if (arg.equals("--output") || arg.equals("-o")) {
        outputDir = new File(args[i + 1]);
        i++;
      } else if (arg.equals("--discardImageOnlyDocs") || arg.equals("-d")) {
        keepImageOnlyDocs = false;
      }

    }
    DocMaker docMaker = new DocMaker();
    Properties properties = new Properties();
    properties.setProperty("content.source", "org.apache.lucene.benchmark.byTask.feeds.EnwikiContentSource");
    properties.setProperty("docs.file", wikipedia.getAbsolutePath());
    properties.setProperty("content.source.forever", "false");
    properties.setProperty("keep.image.only.docs", String.valueOf(keepImageOnlyDocs));
    docMaker.setConfig(new Config(properties));
    docMaker.resetInputs();
    if (wikipedia.exists()) {
      System.out.println("Extracting Wikipedia to: " + outputDir + " using EnwikiContentSource");
      outputDir.mkdirs();
      ExtractWikipedia extractor = new ExtractWikipedia(docMaker, outputDir);
      extractor.extract();
    } else {
      printUsage();
    }
  }

  private static void printUsage() {
    System.err.println("Usage: java -cp <...> org.apache.lucene.benchmark.utils.ExtractWikipedia --input|-i  " +
            "[--output|-o <Output Path>] [--discardImageOnlyDocs|-d]");
    System.err.println("--discardImageOnlyDocs tells the extractor to skip Wiki docs that contain only images");
  }

}

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