Java tutorial
/******************************************************************************* * Copyright 2013 The Linux Box Corporation. * * This file is part of Enkive CE (Community Edition). * * Enkive CE 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, either version 3 of * the License, or (at your option) any later version. * * Enkive CE 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 Enkive CE. If not, see * <http://www.gnu.org/licenses/>. *******************************************************************************/ package com.linuxbox.enkive.web.search; import static com.linuxbox.enkive.web.WebConstants.DATA_TAG; import static com.linuxbox.enkive.web.WebConstants.ITEM_TOTAL_TAG; import static com.linuxbox.enkive.web.WebConstants.QUERY_TAG; import static com.linuxbox.enkive.web.WebConstants.RESULTS_TAG; import static com.linuxbox.enkive.web.WebConstants.SEARCH_ID_TAG; import static com.linuxbox.enkive.web.WebPageInfo.PAGE_POSITION_PARAMETER; import static com.linuxbox.enkive.web.WebPageInfo.PAGE_SIZE_PARAMETER; import static com.linuxbox.enkive.web.WebPageInfo.PAGE_SORT_BY_PARAMETER; import static com.linuxbox.enkive.web.WebPageInfo.PAGE_SORT_DIR_PARAMETER; import static com.linuxbox.enkive.web.WebPageInfo.PAGING_LABEL; import java.io.IOException; import java.util.Collection; import java.util.List; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import com.linuxbox.enkive.exception.CannotRetrieveException; import com.linuxbox.enkive.exception.EnkiveServletException; import com.linuxbox.enkive.message.MessageSummary; import com.linuxbox.enkive.retriever.MessageRetrieverService; import com.linuxbox.enkive.web.AbstractJsonServlet; import com.linuxbox.enkive.web.WebConstants; import com.linuxbox.enkive.web.WebPageInfo; import com.linuxbox.enkive.web.WebScriptUtils; import com.linuxbox.enkive.workspace.WorkspaceException; import com.linuxbox.enkive.workspace.WorkspaceService; import com.linuxbox.enkive.workspace.searchQuery.SearchQuery; import com.linuxbox.enkive.workspace.searchResult.ResultPageException; import com.linuxbox.enkive.workspace.searchResult.SearchResult; /** * This webscript is run when a user wants to see the results of a prior search, * either recent or saved */ public class ViewSavedResultsServlet extends AbstractJsonServlet { /** * */ private static final long serialVersionUID = 1226107681645083623L; protected static final Log LOGGER = LogFactory.getLog("com.linuxbox.enkive.webscripts.search.saved"); protected MessageRetrieverService archiveService; protected WorkspaceService workspaceService; @Override public void init(ServletConfig config) throws ServletException { super.init(config); this.workspaceService = getWorkspaceService(); this.archiveService = getMessageRetrieverService(); } public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException { String sortBy = null; int sortDir = 1; res.setCharacterEncoding("UTF-8"); try { String searchId = WebScriptUtils.cleanGetParameter(req, "id"); sortBy = WebScriptUtils.cleanGetParameter(req, PAGE_SORT_BY_PARAMETER); String sortDirString = WebScriptUtils.cleanGetParameter(req, PAGE_SORT_DIR_PARAMETER); if (sortDirString != null) sortDir = Integer.parseInt(sortDirString); WebPageInfo pageInfo = new WebPageInfo(WebScriptUtils.cleanGetParameter(req, PAGE_POSITION_PARAMETER), WebScriptUtils.cleanGetParameter(req, PAGE_SIZE_PARAMETER)); JSONObject dataJSON = new JSONObject(); JSONObject jsonResult = new JSONObject(); dataJSON.put(SEARCH_ID_TAG, searchId); if (LOGGER.isInfoEnabled()) LOGGER.info("Loading " + searchId); SearchQuery query = workspaceService.getSearch(searchId); /* Query */ try { dataJSON.put(QUERY_TAG, query.toJson()); } catch (JSONException e) { LOGGER.error("could not return search criteria for search " + searchId, e); } /* Message Result List */ try { SearchResult result = query.getResult(); List<String> messageIds = result.getPage(sortBy, sortDir, pageInfo.getPagePos(), pageInfo.getPageSize()); List<MessageSummary> messageSummaries = archiveService.retrieveSummary(messageIds); pageInfo.setItemTotal(result.getCount()); dataJSON.put(WebConstants.STATUS_ID_TAG, query.getStatus()); JSONArray jsonMessageSummaryList = SearchResultsBuilder .getMessageListJSON((Collection<MessageSummary>) messageSummaries); dataJSON.put(ITEM_TOTAL_TAG, pageInfo.getItemTotal()); dataJSON.put(RESULTS_TAG, jsonMessageSummaryList); } catch (CannotRetrieveException e) { LOGGER.error("Could not access result message list", e); // throw new WebScriptException( // "Could not access query result message list", e); } catch (ResultPageException e) { LOGGER.error("Could not get page of results", e); this.addError(dataJSON, e.toString()); } if (LOGGER.isDebugEnabled()) LOGGER.debug("Returning saved search results for search id " + searchId); jsonResult.put(DATA_TAG, dataJSON); jsonResult.put(PAGING_LABEL, pageInfo.getPageJSON()); jsonResult.write(res.getWriter()); } catch (WorkspaceException e) { respondError(HttpServletResponse.SC_UNAUTHORIZED, null, res); throw new EnkiveServletException("Could not login to repository to retrieve search", e); } catch (JSONException e) { respondError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, null, res); throw new EnkiveServletException("Unable to serialize JSON", e); } finally { } } }