/*
* #!
* Ontopia Navigator
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package net.ontopia.topicmaps.nav2.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collections;
import java.util.Iterator;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import net.ontopia.utils.StringUtils;
import net.ontopia.topicmaps.core.TopicMapStoreIF;
import net.ontopia.topicmaps.core.TopicIF;
import net.ontopia.topicmaps.entry.TopicMaps;
import net.ontopia.topicmaps.query.core.QueryProcessorIF;
import net.ontopia.topicmaps.query.core.QueryResultIF;
import net.ontopia.topicmaps.query.utils.QueryUtils;
import net.ontopia.topicmaps.utils.TopicStringifiers;
/**
* INTERNAL: Experimental auto suggest servlet.
*/
public class AutoSuggestServlet extends HttpServlet {
int limit = 25;
String query = "select $T, $DESC from value-like($TN, %TERM%), topic-name($T, $TN), { i\"http://purl.org/dc/elements/1.1/description\"($T, $DESC) } order by $T, $DESC desc?";
public void init() throws ServletException {
}
public void destroy() {
}
private String escape(String s) {
return StringUtils.replace(StringUtils.replace(s, "\"", "\\\""), "\n", " ");
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/plain; charset=utf-8");
String tmid = request.getParameter("tm");
if (tmid == null) throw new ServletException("Parameter tm is not given.");
String term = request.getParameter("term");
if (term == null) throw new ServletException("Parameter term is not given.");
TopicMapStoreIF store = TopicMaps.createStore(tmid, true);
if (store instanceof net.ontopia.topicmaps.impl.basic.InMemoryTopicMapStore)
term = term + '*';
try {
QueryProcessorIF qp = QueryUtils.getQueryProcessor(store.getTopicMap());
QueryResultIF qr = qp.execute(query, Collections.singletonMap("TERM", term));
System.out.println("query: " + query);
PrintWriter w = response.getWriter();
w.write("{ results: [\n");
int count = 0;
while (qr.next()) {
if (count > limit) break;
if (count > 0) w.write(",\n");
TopicIF topic = (TopicIF)qr.getValue(0);
String desc = (String)qr.getValue(1);
w.write(" { id: \"");
w.write(topic.getObjectId());
w.write("\", value: \"");
w.write(escape(TopicStringifiers.toString(topic)));
w.write("\", info: \"");
w.write((desc == null ? "" : escape(desc)));
w.write("\" }");
count++;
}
w.write("\n] }\n");
} catch (Exception e) {
throw new ServletException(e);
} finally {
store.close();
}
}
}