1   /**
2    * Distribution License:
3    * JSword is free software; you can redistribute it and/or modify it under
4    * the terms of the GNU Lesser General Public License, version 2.1 as published by
5    * the Free Software Foundation. This program is distributed in the hope
6    * that it will be useful, but WITHOUT ANY WARRANTY; without even the
7    * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
8    * See the GNU Lesser General Public License for more details.
9    *
10   * The License is available on the internet at:
11   *       http://www.gnu.org/copyleft/lgpl.html
12   * or by writing to:
13   *      Free Software Foundation, Inc.
14   *      59 Temple Place - Suite 330
15   *      Boston, MA 02111-1307, USA
16   *
17   * Copyright: 2007
18   *     The copyright to this program is held by it's authors.
19   *
20   * ID: $Id: KeyAnalyzer.java 1376 2007-06-01 18:27:01Z dmsmith $
21   */
22  package org.crosswire.jsword.index.lucene.analysis;
23  
24  import java.io.IOException;
25  import java.io.Reader;
26  
27  import org.apache.lucene.analysis.LowerCaseTokenizer;
28  import org.apache.lucene.analysis.StopFilter;
29  import org.apache.lucene.analysis.TokenStream;
30  import org.apache.lucene.analysis.de.GermanAnalyzer;
31  import org.apache.lucene.analysis.de.GermanStemFilter;
32  import org.apache.lucene.util.Version;
33  
34  /**
35   * Based on Lucene's GermanAnalyzer
36   * 
37   * @see gnu.lgpl.License for license details.<br>
38   *      The copyright to this program is held by it's authors.
39   * @author Sijo Cherian [sijocherian at yahoo dot com]
40   */
41  public class GermanLuceneAnalyzer extends AbstractBookAnalyzer {
42      public GermanLuceneAnalyzer() {
43          stopSet = GermanAnalyzer.getDefaultStopSet();
44      }
45  
46      /* (non-Javadoc)
47       * @see org.apache.lucene.analysis.Analyzer#tokenStream(java.lang.String, java.io.Reader)
48       */
49      @Override
50      public TokenStream tokenStream(String fieldName, Reader reader) {
51          TokenStream result = new LowerCaseTokenizer(reader);
52  
53          if (doStopWords && stopSet != null) {
54              result = new StopFilter(false, result, stopSet);
55          }
56  
57          if (doStemming) {
58              result = new GermanStemFilter(result);
59          }
60  
61          return result;
62      }
63  
64      /* (non-Javadoc)
65       * @see org.apache.lucene.analysis.Analyzer#reusableTokenStream(java.lang.String, java.io.Reader)
66       */
67      @Override
68      public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException {
69          SavedStreams streams = (SavedStreams) getPreviousTokenStream();
70          if (streams == null) {
71              streams = new SavedStreams(new LowerCaseTokenizer(reader));
72              if (doStopWords && stopSet != null) {
73                  streams.setResult(new StopFilter(StopFilter.getEnablePositionIncrementsVersionDefault(matchVersion), streams.getResult(), stopSet));
74              }
75  
76              if (doStemming) {
77                  streams.setResult(new GermanStemFilter(streams.getResult()));
78              }
79  
80              setPreviousTokenStream(streams);
81          } else {
82              streams.getSource().reset(reader);
83          }
84          return streams.getResult();
85      }
86  
87      private final Version matchVersion = Version.LUCENE_29;
88  }
89