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     */
031    public class PerFieldAnalyzerWrapper
032            extends org.apache.lucene.analysis.PerFieldAnalyzerWrapper {
033    
034            public PerFieldAnalyzerWrapper(
035                    Analyzer defaultAnalyzer, Map<String, Analyzer> analyzerMap) {
036    
037                    super(defaultAnalyzer, analyzerMap);
038    
039                    _analyzer = defaultAnalyzer;
040                    _analyzers = analyzerMap;
041            }
042    
043            @Override
044            public void addAnalyzer(String fieldName, Analyzer analyzer) {
045                    super.addAnalyzer(fieldName, analyzer);
046    
047                    _analyzers.put(fieldName, analyzer);
048            }
049    
050            @Override
051            public int getOffsetGap(Fieldable field) {
052                    Analyzer analyzer = _getAnalyzer(field.name());
053    
054                    return analyzer.getOffsetGap(field);
055            }
056    
057            @Override
058            public int getPositionIncrementGap(String fieldName) {
059                    Analyzer analyzer = _getAnalyzer(fieldName);
060    
061                    return analyzer.getPositionIncrementGap(fieldName);
062            }
063    
064            @Override
065            public TokenStream reusableTokenStream(String fieldName, Reader reader)
066                    throws IOException {
067    
068                    Analyzer analyzer = _getAnalyzer(fieldName);
069    
070                    return analyzer.reusableTokenStream(fieldName, reader);
071            }
072    
073            @Override
074            public TokenStream tokenStream(String fieldName, Reader reader) {
075                    Analyzer analyzer = _getAnalyzer(fieldName);
076    
077                    return analyzer.tokenStream(fieldName, reader);
078            }
079    
080            private Analyzer _getAnalyzer(String fieldName) {
081                    Analyzer analyzer = _analyzers.get(fieldName);
082    
083                    if (analyzer != null) {
084                            return analyzer;
085                    }
086    
087                    for (String key : _analyzers.keySet()) {
088                            if (Pattern.matches(key, fieldName)) {
089                                    return _analyzers.get(key);
090                            }
091                    }
092    
093                    return _analyzer;
094            }
095    
096            private Analyzer _analyzer;
097            private Map<String, Analyzer> _analyzers = new HashMap<String, Analyzer>();
098    
099    }