Lucene example source code file (TrecGov2Parser.java)

This example Lucene source code file (TrecGov2Parser.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, dochdr, dochdr, htmlparser, interruptedexception, io, ioexception, string, string, terminating_dochdr, terminating_dochdr_length, trecgov2parser, util

The Lucene TrecGov2Parser.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.io.Reader;
import java.util.Date;

/**
 * Parser for the GOV2 collection format
 */
public class TrecGov2Parser extends TrecDocParser {

  private static final String DATE = "Date: ";
  private static final String DATE_END = TrecContentSource.NEW_LINE;
  
  private static final String DOCHDR = "<DOCHDR>";
  private static final String TERMINATING_DOCHDR = "</DOCHDR>";
  private static final int TERMINATING_DOCHDR_LENGTH = TERMINATING_DOCHDR.length();

  @Override
  public DocData parse(DocData docData, String name, TrecContentSource trecSrc, 
      StringBuilder docBuf, ParsePathType pathType) throws IOException, InterruptedException {
    // Set up a (per-thread) reused Reader over the read content, reset it to re-read from docBuf
    Reader r = trecSrc.getTrecDocReader(docBuf);

    // skip some of the text, optionally set date
    Date date = null;
    int h1 = docBuf.indexOf(DOCHDR);
    if (h1>=0) {
      int h2 = docBuf.indexOf(TERMINATING_DOCHDR,h1);
      String dateStr = extract(docBuf, DATE, DATE_END, h2, null);
      if (dateStr != null) {
        date = trecSrc.parseDate(dateStr);
      }
      r.mark(h2+TERMINATING_DOCHDR_LENGTH);
    }

    r.reset();
    HTMLParser htmlParser = trecSrc.getHtmlParser();
    return htmlParser.parse(docData, name, date, null, r, null);
  }
  
}