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Lucene example source code file (TrecLATimesParser.java)

This example Lucene source code file (TrecLATimesParser.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

date, date, date_end, date_noise, headline, headline, headline_end, interruptedexception, io, ioexception, string, string, subject, subject, subject_end, util

The Lucene TrecLATimesParser.java source code

package org.apache.lucene.benchmark.byTask.feeds;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.io.IOException;
import java.util.Date;

 * Parser for the FT docs in trec disks 4+5 collection format
public class TrecLATimesParser extends TrecDocParser {

  private static final String DATE = "<DATE>";
  private static final String DATE_END = "</DATE>";
  private static final String DATE_NOISE = "day,"; // anything aftre the ',' 

  private static final String SUBJECT = "<SUBJECT>";
  private static final String SUBJECT_END = "</SUBJECT>";
  private static final String HEADLINE = "<HEADLINE>";
  private static final String HEADLINE_END = "</HEADLINE>";
  public DocData parse(DocData docData, String name, TrecContentSource trecSrc, 
      StringBuilder docBuf, ParsePathType pathType) throws IOException, InterruptedException {
    int mark = 0; // that much is skipped

    // date...
    Date date = null;
    String dateStr = extract(docBuf, DATE, DATE_END, -1, null);
    if (dateStr != null) {
      int d2a = dateStr.indexOf(DATE_NOISE);
      if (d2a > 0) {
        dateStr = dateStr.substring(0,d2a+3); // we need the "day" part
      dateStr = stripTags(dateStr,0).toString();
      date = trecSrc.parseDate(dateStr.trim());
    // title... first try with SUBJECT, them with HEADLINE
    String title = extract(docBuf, SUBJECT, SUBJECT_END, -1, null);
    if (title==null) {
      title = extract(docBuf, HEADLINE, HEADLINE_END, -1, null);
    if (title!=null) {
      title = stripTags(title,0).toString().trim();
    docData.setBody(stripTags(docBuf, mark).toString());
    return docData;


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