Java tutorial
/** * * BibSonomy-Lucene - A blue social bookmark and publication sharing system. * * Copyright (C) 2006 - 2011 Knowledge & Data Engineering Group, * University of Kassel, Germany * http://www.kde.cs.uni-kassel.de/ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ package org.bibsonomy.lucene.util; import static org.apache.lucene.util.Version.LUCENE_24; import static org.bibsonomy.lucene.util.LuceneBase.CFG_INDEX_ID_DELIMITER; import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStreamReader; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.document.Document; import org.apache.lucene.document.Fieldable; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.Term; import org.apache.lucene.queryParser.ParseException; import org.apache.lucene.queryParser.QueryParser; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.Sort; import org.apache.lucene.search.SortField; import org.apache.lucene.search.TermQuery; import org.apache.lucene.search.TopDocs; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.bibsonomy.lucene.index.analyzer.SpringPerFieldAnalyzerWrapper; /** * @author fei * @version $Id: LuceneCommandLine.java,v 1.5 2010-05-28 10:22:48 nosebrain Exp $ */ public class LuceneCommandLine { private static final Log log = LogFactory.getLog(LuceneCommandLine.class); // FIXME: check implementation private Analyzer analyzer = new SpringPerFieldAnalyzerWrapper(); static { JNDITestDatabaseBinder.bind(); } /** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { LuceneCommandLine lcml = new LuceneCommandLine(); lcml.init(); lcml.doQuerying(); } private void init() { LuceneBase.initRuntimeConfiguration(); } private void doQuerying() throws Exception { String bibTexIndexPath = LuceneBase.getIndexBasePath() + "lucene_BibTex" + CFG_INDEX_ID_DELIMITER + "0"; Directory bibTexDirectory = FSDirectory.open(new File(bibTexIndexPath)); IndexReader bibTexReader = IndexReader.open(bibTexDirectory, false); IndexSearcher bibTexSearcher = new IndexSearcher(bibTexReader); String bookmarkIndexPath = LuceneBase.getIndexBasePath() + "lucene_Bookmark" + CFG_INDEX_ID_DELIMITER + "0"; Directory bookmarkDirectory = FSDirectory.open(new File(bookmarkIndexPath)); IndexReader bookmarkReader = IndexReader.open(bookmarkDirectory, false); IndexSearcher bookmarkSearcher = new IndexSearcher(bookmarkReader); SortField sortField = new SortField("last_tas_id", SortField.INT, true); Sort sort = new Sort(sortField); String searchTerms = null; while (!"!quit".equals(searchTerms)) { System.out.print("Query: "); searchTerms = readStdIn(); doSearching(bookmarkSearcher, sort, searchTerms); doSearching(bibTexSearcher, sort, searchTerms); } } private void doSearching(IndexSearcher searcher, Sort sort, String searchTerms) { if (!"!quit".equals(searchTerms)) { long queryTimeMs = System.currentTimeMillis(); Query searchQuery = parseSearchQuery(searchTerms); queryTimeMs = System.currentTimeMillis() - queryTimeMs; //------------------------------------------------------------ // query the index //------------------------------------------------------------ Document doc = null; try { TopDocs topDocs = null; topDocs = searcher.search(searchQuery, null, 100, sort); for (int i = 0; i < topDocs.totalHits; i++) { doc = searcher.doc(topDocs.scoreDocs[i].doc); System.out.println("Document[" + i + "]:"); List<Fieldable> fields = doc.getFields(); for (Fieldable field : fields) { System.out.println(" " + field.name() + ":\t" + doc.getField(field.name())); } } } catch (Exception e) { log.error("Error reading index file (" + e.getMessage() + ")"); } finally { try { searcher.close(); } catch (IOException e) { log.error("Error closing index for searching", e); } } System.out.println("Query time: " + queryTimeMs); } } private String readStdIn() { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String input = null; // read the username from the command-line; need to use try/catch with the // readLine() method try { input = br.readLine(); } catch (IOException ioe) { log.error("Error reading input.", ioe); } return input; } /** * build full text query for given query string * * @param searchTerms * @return */ private Query parseSearchQuery(String searchTerms) { // parse search terms for handling phrase search QueryParser searchTermParser = new QueryParser(LUCENE_24, "mergedfields", analyzer); // FIXME: configure default operator via spring Query searchTermQuery = null; try { searchTermQuery = searchTermParser.parse(searchTerms); } catch (ParseException e) { searchTermQuery = new TermQuery(new Term("mergedfields", searchTerms)); } return searchTermQuery; } }