/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.nutch.webapp.controller;
import java.io.IOException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.nutch.ontology.Ontology;
import org.apache.nutch.webapp.common.ServiceLocator;
import org.apache.nutch.webapp.common.Startable;
import org.apache.struts.tiles.ComponentContext;
public class OntologyProposerController extends NutchController implements Startable {
public static final String ATTR_NAME="queryPropose";
static Ontology ontology;
public void nutchPerform(ComponentContext tileContext, HttpServletRequest request, HttpServletResponse response, ServletContext servletContext) throws ServletException, IOException {
ServiceLocator locator=getServiceLocator(request);
if (ontology != null) {
LOG.info("Calling ontology with parameter:" + locator.getSearch().getQueryString());
request.setAttribute(ATTR_NAME, ontology.subclasses(locator.getSearch().getQueryString()));
}
}
/*
* (non-Javadoc)
* @see org.apache.nutch.webapp.common.Startable#start(javax.servlet.ServletContext)
*/
public void start(ServletContext servletContext) {
ServiceLocator locator=getServiceLocator(servletContext);
try {
String urls = locator.getConfiguration().get("extension.ontology.urls");
ontology = new org.apache.nutch.ontology.OntologyFactory(locator.getConfiguration()).getOntology();
LOG.info("Initializing Ontology with urls:" + urls);
//FIXME initialization code should be in Ontology instead
if (urls==null || urls.trim().equals("")) {
// ignored siliently
} else {
ontology.load(urls.split("\\s+"));
}
} catch (Exception e) {
LOG.info("Exception occured while initializing Ontology" + e);
}
}
}