Java tutorial
/* * ConcourseConnect * Copyright 2009 Concursive Corporation * http://www.concursive.com * * This file is part of ConcourseConnect, an open source social business * software and community platform. * * Concursive ConcourseConnect is free software: you can redistribute it and/or * modify it under the terms of the GNU Affero General Public License as published * by the Free Software Foundation, version 3 of the License. * * Under the terms of the GNU Affero General Public License you must release the * complete source code for any application that uses any part of ConcourseConnect * (system header files and libraries used by the operating system are excluded). * These terms must be included in any work that has ConcourseConnect components. * If you are developing and distributing open source applications under the * GNU Affero General Public License, then you are free to use ConcourseConnect * under the GNU Affero General Public License. * * If you are deploying a web site in which users interact with any portion of * ConcourseConnect over a network, the complete source code changes must be made * available. For example, include a link to the source archive directly from * your web site. * * For OEMs, ISVs, SIs and VARs who distribute ConcourseConnect with their * products, and do not license and distribute their source code under the GNU * Affero General Public License, Concursive provides a flexible commercial * license. * * To anyone in doubt, we recommend the commercial license. Our commercial license * is competitively priced and will eliminate any confusion about how * ConcourseConnect can be used and distributed. * * ConcourseConnect 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 Affero General Public License for more * details. * * You should have received a copy of the GNU Affero General Public License * along with ConcourseConnect. If not, see <http://www.gnu.org/licenses/>. * * Attribution Notice: ConcourseConnect is an Original Work of software created * by Concursive Corporation */ package com.concursive.connect.indexer; import com.concursive.connect.Constants; import com.concursive.connect.web.utils.PagedListInfo; 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.queryParser.QueryParser; import org.apache.lucene.search.*; import org.apache.lucene.store.Directory; import java.io.IOException; /** * User: jfielek * Date: Dec 17, 2008 * Time: 2:40:07 PM */ public class LuceneIndexerSearch implements IIndexerSearch { private static Log LOG = LogFactory.getLog(LuceneIndexerSearch.class); protected IndexSearcher searcher = null; protected Analyzer analyzer = null; protected int indexType = Constants.UNDEFINED; // Initial configuration public void setup(Directory index, Analyzer analyzer, int indexType) throws IOException { this.indexType = indexType; try { this.searcher = new IndexSearcher(index); } catch (IOException e) { e.printStackTrace(); throw e; } this.analyzer = analyzer; } public void teardown() throws IOException { if (searcher != null) { searcher.close(); } } public void search(IndexerQueryResultList response) { LOG.debug("Search called, using search index type: " + indexType); QueryParser parser = new QueryParser("contents", analyzer); try { Hits hits; Query query = parser.parse(response.getQueryString()); if (response.getPagedListInfo().getColumnToSortBy() == null) { hits = searcher.search(query); } else { Sort sort = new Sort(new SortField(response.getPagedListInfo().getColumnToSortBy())); hits = searcher.search(query, sort); } // Convert hits to IndexerResponse objects... convertHits(response, hits); } catch (Exception e) { e.printStackTrace(); } } private void convertHits(IndexerQueryResultList response, Hits hits) { PagedListInfo pagedListInfo = response.getPagedListInfo(); // No need to process any further if no hits found if (hits.length() > 0) { // The query needs to update the pagedListInfo with the max records pagedListInfo.setMaxRecords(hits.length()); // Use the pagedListInfo properties for sorting below int currentOffset = pagedListInfo.getCurrentOffset(); int itemsPerPage = pagedListInfo.getItemsPerPage(); int maxRecords = pagedListInfo.getMaxRecords(); String sortOrder = pagedListInfo.getSortOrder(); // Determine the requested sort order boolean asc = true; if ("desc".equalsIgnoreCase(sortOrder)) { asc = false; } // Convert the Lucene hits to a subset if (asc) { // Determine the startIndex int startIndex = currentOffset; if (startIndex < 0) { startIndex = 0; } // Determine the upper limit int limit = currentOffset + itemsPerPage; if (limit == -1 || limit > maxRecords) { limit = maxRecords; } // Retrieve the range of hits for (int i = startIndex; i < limit; i++) { try { Document doc = hits.doc(i); IndexerQueryResult responseItem = new IndexerQueryResult(response); responseItem.setIndexId(hits.id(i)); populateIndexerQueryResult(responseItem, doc); response.add(responseItem); } catch (IOException e) { e.printStackTrace(); } } } else { // Determine the start index int startIndex = maxRecords - 1 - currentOffset; // Determine the lower limit int limit = maxRecords - 1 - currentOffset - itemsPerPage; if (limit < -1) { limit = -1; } // Retrieve the range of hits for (int i = startIndex; i > limit; i--) { try { Document doc = hits.doc(i); IndexerQueryResult responseItem = new IndexerQueryResult(response); responseItem.setIndexId(hits.id(i)); populateIndexerQueryResult(responseItem, doc); // Get the following fields... response.add(responseItem); } catch (IOException e) { e.printStackTrace(); } } } } } private void populateIndexerQueryResult(IndexerQueryResult responseItem, Document doc) { // Get the following fields... responseItem.setType(doc.getField("type").stringValue()); responseItem.setProjectId(doc.getField("projectId").stringValue()); responseItem.setGuests(doc.getField("guests").stringValue()); responseItem.setMembership(doc.getField("membership").stringValue()); responseItem.setTitle(doc.getField("title").stringValue()); responseItem.setContents(doc.getField("contents").stringValue()); responseItem.setModified(doc.getField("modified").stringValue()); // Handle a few object specific instances (for now) if ("wiki".equals(responseItem.getType())) { responseItem.setSubjectLink(doc.getField("subjectLink").stringValue()); } else if ("activityfolder".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("assignmentFolderId").stringValue()); } else if ("activity".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("assignmentId").stringValue()); } else if ("activitynote".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("assignmentNoteId").stringValue()); } else if ("classifieds".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("classifiedId").stringValue()); } else if ("ads".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("adId").stringValue()); } else if ("issuecategory".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("issueCategoryId").stringValue()); } else if ("issuereply".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("issueReplyId").stringValue()); } else if ("outline".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("requirementId").stringValue()); } else if ("reviews".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("ratingId").stringValue()); } else if ("ticket".equals(responseItem.getType())) { responseItem.setObjectId(doc.getField("ticketId").stringValue()); responseItem.setObjectSerialId(doc.getField("projectTicketId").stringValue()); } else { responseItem.setObjectId(doc.getField(responseItem.getType() + "Id").stringValue()); } } }