1 package org.apache.maven.index.context;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.lucene.analysis.Analyzer;
23 import org.apache.lucene.analysis.AnalyzerWrapper;
24 import org.apache.lucene.analysis.util.CharTokenizer;
25 import org.apache.lucene.analysis.standard.StandardAnalyzer;
26 import org.apache.maven.index.ArtifactInfo;
27
28 /**
29 * A Nexus specific <a
30 * href="http://lucene.apache.org/java/2_4_0/api/core/org/apache/lucene/analysis/Analyzer.html">Lucene Analyzer</a> used
31 * to produce legacy index transfer format
32 *
33 * @author Jason van Zyl
34 */
35 public final class NexusLegacyAnalyzer
36 extends AnalyzerWrapper
37 {
38 private static final Analyzer DEFAULT_ANALYZER = new StandardAnalyzer();
39
40 private static final Analyzer LETTER_OR_DIGIT_ANALYZER = new Analyzer()
41 {
42 @Override
43 protected TokenStreamComponents createComponents( final String fieldName )
44 {
45 return new TokenStreamComponents( new CharTokenizer()
46 {
47 @Override
48 protected boolean isTokenChar( int c )
49 {
50 return Character.isLetterOrDigit( c );
51 }
52
53 @Override
54 protected int normalize( int c )
55 {
56 return Character.toLowerCase( c );
57 }
58 } );
59 }
60 };
61
62 public NexusLegacyAnalyzer()
63 {
64 super( PER_FIELD_REUSE_STRATEGY );
65 }
66
67 @Override
68 protected Analyzer getWrappedAnalyzer( String fieldName )
69 {
70 if ( !isTextField( fieldName ) )
71 {
72 return LETTER_OR_DIGIT_ANALYZER;
73 }
74 else
75 {
76 return DEFAULT_ANALYZER;
77 }
78 }
79
80 protected boolean isTextField( String field )
81 {
82 return ArtifactInfo.NAME.equals( field ) || ArtifactInfo.DESCRIPTION.equals( field )
83 || ArtifactInfo.NAMES.equals( field );
84 }
85 }