Lucene example source code file (TrecFR94Parser.java)

This example Lucene source code file (TrecFR94Parser.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_end, date_noise_prefixes, interruptedexception, io, ioexception, string, string, stringbuilder, text, text, todo, trecfr94parser, util

The Lucene TrecFR94Parser.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,
 * 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.IOException;
import java.util.Date;

/**
 * Parser for the FR94 docs in trec disks 4+5 collection format
 */
public class TrecFR94Parser extends TrecDocParser {

  private static final String TEXT = "<TEXT>";
  private static final int TEXT_LENGTH = TEXT.length();
  private static final String TEXT_END = "</TEXT>";
  
  private static final String DATE = "<DATE>";
  private static final String[] DATE_NOISE_PREFIXES = {
    "DATE:",
    "date:", //TODO improve date extraction for this format
    "t.c.",
  };
  private static final String DATE_END = "</DATE>";
  
  //TODO can we also extract title for this format?
  
  @Override
  public DocData parse(DocData docData, String name, TrecContentSource trecSrc, 
      StringBuilder docBuf, ParsePathType pathType) throws IOException, InterruptedException {
    int mark = 0; // that much is skipped
    // optionally skip some of the text, set date (no title?)
    Date date = null;
    int h1 = docBuf.indexOf(TEXT);
    if (h1>=0) {
      int h2 = docBuf.indexOf(TEXT_END,h1);
      mark = h1+TEXT_LENGTH;
      // date...
      String dateStr = extract(docBuf, DATE, DATE_END, h2, DATE_NOISE_PREFIXES);
      if (dateStr != null) {
        dateStr = stripTags(dateStr,0).toString();
        date = trecSrc.parseDate(dateStr.trim());
      }
    }
    docData.clear();
    docData.setName(name);
    docData.setDate(date);
    docData.setBody(stripTags(docBuf, mark).toString());
    return docData;
  }

}