001    /**
002     * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.search.lucene;
016    
017    import java.io.IOException;
018    import java.io.Reader;
019    
020    import java.util.HashMap;
021    import java.util.Map;
022    import java.util.regex.Pattern;
023    
024    import org.apache.lucene.analysis.Analyzer;
025    import org.apache.lucene.analysis.TokenStream;
026    import org.apache.lucene.document.Fieldable;
027    
028    /**
029     * @author Raymond Augé
030     * @author Mate Thurzo
031     */
032    public class PerFieldAnalyzer extends Analyzer {
033    
034            public PerFieldAnalyzer(
035                    Analyzer defaultAnalyzer, Map<String, Analyzer> analyzerMap) {
036    
037                    _analyzer = defaultAnalyzer;
038                    _analyzers = analyzerMap;
039            }
040    
041            public void addAnalyzer(String fieldName, Analyzer analyzer) {
042                    _analyzers.put(fieldName, analyzer);
043            }
044    
045            public Analyzer getAnalyzer(String fieldName) {
046                    Analyzer analyzer = _analyzers.get(fieldName);
047    
048                    if (analyzer != null) {
049                            return analyzer;
050                    }
051    
052                    for (String key : _analyzers.keySet()) {
053                            if (Pattern.matches(key, fieldName)) {
054                                    return _analyzers.get(key);
055                            }
056                    }
057    
058                    return _analyzer;
059            }
060    
061            @Override
062            public int getOffsetGap(Fieldable field) {
063                    Analyzer analyzer = getAnalyzer(field.name());
064    
065                    return analyzer.getOffsetGap(field);
066            }
067    
068            @Override
069            public int getPositionIncrementGap(String fieldName) {
070                    Analyzer analyzer = getAnalyzer(fieldName);
071    
072                    return analyzer.getPositionIncrementGap(fieldName);
073            }
074    
075            @Override
076            public TokenStream reusableTokenStream(String fieldName, Reader reader)
077                    throws IOException {
078    
079                    Analyzer analyzer = getAnalyzer(fieldName);
080    
081                    return analyzer.reusableTokenStream(fieldName, reader);
082            }
083    
084            @Override
085            public TokenStream tokenStream(String fieldName, Reader reader) {
086                    Analyzer analyzer = getAnalyzer(fieldName);
087    
088                    return analyzer.tokenStream(fieldName, reader);
089            }
090    
091            private Analyzer _analyzer;
092            private Map<String, Analyzer> _analyzers = new HashMap<String, Analyzer>();
093    
094    }