001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.runtime.search.lucene2.highlight;
020
021import java.io.IOException;
022import java.io.StringReader;
023
024import lucee.commons.lang.StringUtil;
025
026import org.apache.lucene.analysis.Analyzer;
027import org.apache.lucene.analysis.TokenStream;
028import org.apache.lucene.search.Query;
029import org.apache.lucene.search.highlight.Highlighter;
030import org.apache.lucene.search.highlight.QueryScorer;
031import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
032
033public class _Highlight {
034
035        public static String createContextSummary(Object highlighter, Analyzer analyzer, String text, int maxNumFragments,String defaultValue) throws IOException {
036                if(!(highlighter instanceof Highlighter) || analyzer==null || StringUtil.isEmpty(text))
037                        return defaultValue;
038                        
039                TokenStream tokenStream = analyzer.tokenStream("", new StringReader(text));
040                        return ((Highlighter)highlighter).getBestFragments(tokenStream, text, maxNumFragments, "...");                          
041        }
042
043        public static Object createHighlighter(Query query,String highlightBegin,String highlightEnd) {
044                
045                        return new Highlighter(
046                                        //new SimpleHTMLFormatter("<span class=\"matching-term\">","</span>"),
047                                        new SimpleHTMLFormatter(highlightBegin,highlightEnd),
048                                        new QueryScorer(query));
049                
050        }
051
052}