001    /**
002     * Copyright (c) 2000-2013 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 Aug??
030     */
031    public class PerFieldAnalyzer extends Analyzer {
032    
033            public PerFieldAnalyzer(
034                    Analyzer defaultAnalyzer, Map<String, Analyzer> analyzerMap) {
035    
036                    _analyzer = defaultAnalyzer;
037                    _analyzers = analyzerMap;
038            }
039    
040            public void addAnalyzer(String fieldName, Analyzer analyzer) {
041                    _analyzers.put(fieldName, analyzer);
042            }
043    
044            public Analyzer getAnalyzer(String fieldName) {
045                    Analyzer analyzer = _analyzers.get(fieldName);
046    
047                    if (analyzer != null) {
048                            return analyzer;
049                    }
050    
051                    for (String key : _analyzers.keySet()) {
052                            if (Pattern.matches(key, fieldName)) {
053                                    return _analyzers.get(key);
054                            }
055                    }
056    
057                    return _analyzer;
058            }
059    
060            @Override
061            public int getOffsetGap(Fieldable field) {
062                    Analyzer analyzer = getAnalyzer(field.name());
063    
064                    return analyzer.getOffsetGap(field);
065            }
066    
067            @Override
068            public int getPositionIncrementGap(String fieldName) {
069                    Analyzer analyzer = getAnalyzer(fieldName);
070    
071                    return analyzer.getPositionIncrementGap(fieldName);
072            }
073    
074            @Override
075            public TokenStream reusableTokenStream(String fieldName, Reader reader)
076                    throws IOException {
077    
078                    Analyzer analyzer = getAnalyzer(fieldName);
079    
080                    return analyzer.reusableTokenStream(fieldName, reader);
081            }
082    
083            @Override
084            public TokenStream tokenStream(String fieldName, Reader reader) {
085                    Analyzer analyzer = getAnalyzer(fieldName);
086    
087                    return analyzer.tokenStream(fieldName, reader);
088            }
089    
090            private Analyzer _analyzer;
091            private Map<String, Analyzer> _analyzers = new HashMap<String, Analyzer>();
092    
093    }