001 /**
002 * Copyright 2005-2012 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.kuali.rice.edl.impl;
017
018 import org.apache.commons.lang.StringUtils;
019 import org.apache.log4j.Logger;
020 import org.kuali.rice.core.api.util.xml.XmlJotter;
021 import org.kuali.rice.kim.api.identity.Person;
022 import org.kuali.rice.krad.util.GlobalVariables;
023 import org.w3c.dom.Document;
024
025 import javax.servlet.http.HttpServletResponse;
026 import javax.xml.transform.OutputKeys;
027 import javax.xml.transform.Transformer;
028 import javax.xml.transform.dom.DOMSource;
029 import javax.xml.transform.stream.StreamResult;
030 import java.util.Stack;
031
032
033 /**
034 * Contains a stack of EDLControllers. Allows EDL components to add new controllers to the chain runtime. The idea
035 * being that this is how you would page between edls. Uses the template associated with the last edl controller
036 * to render the dom of the last edl controller.
037 *
038 * @author Kuali Rice Team (rice.collab@kuali.org)
039 *
040 */
041 public class EDLControllerChain {
042
043 private static final Logger LOG = Logger.getLogger(EDLControllerChain.class);
044
045 private Stack<EDLController> edlControllers = new Stack<EDLController>();
046
047 public void renderEDL(RequestParser requestParser, HttpServletResponse response) throws Exception {
048 EDLController edlController = edlControllers.pop();
049 edlController.setEdlContext(getInitialEDLContext(edlController, requestParser, edlController.getStyle().newTransformer()));
050
051 Document dom = edlController.notifyComponents();
052 if (edlControllers.isEmpty()) {
053 transform(edlController.getEdlContext(), dom, response);
054 } else {
055 renderEDL(requestParser, response);
056 }
057 }
058
059 public void addEdlController(EDLController edlController) {
060 edlControllers.add(edlController);
061 }
062
063 private void transform(EDLContext edlContext, Document dom, HttpServletResponse response) throws Exception {
064 if (StringUtils.isNotBlank(edlContext.getRedirectUrl())) {
065 response.sendRedirect(edlContext.getRedirectUrl());
066 return;
067 }
068 response.setContentType("text/html; charset=UTF-8");
069 Transformer transformer = edlContext.getTransformer();
070
071 transformer.setOutputProperty("indent", "yes");
072 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
073 String user = null;
074 String loggedInUser = null;
075 if (edlContext.getUserSession() != null) {
076 Person wu = edlContext.getUserSession().getPerson();
077 if (wu != null) user = wu.getPrincipalId();
078 wu = edlContext.getUserSession().getPerson();
079 if (wu != null) loggedInUser = wu.getPrincipalId();
080 }
081 transformer.setParameter("user", user);
082 transformer.setParameter("loggedInUser", loggedInUser);
083 if (LOG.isDebugEnabled()) {
084 LOG.debug("Transforming dom " + XmlJotter.jotNode(dom, true));
085 }
086 transformer.transform(new DOMSource(dom), new StreamResult(response.getOutputStream()));
087 }
088
089 private EDLContext getInitialEDLContext(EDLController edlController, RequestParser requestParser, Transformer transformer) {
090 EDLContext edlContext = new EDLContext();
091 edlContext.setEdlControllerChain(this);
092 edlContext.setEdocLiteAssociation(edlController.getEdocLiteAssociation());
093 edlContext.setUserSession(GlobalVariables.getUserSession());
094 edlContext.setTransformer(transformer);
095 edlContext.setRequestParser(requestParser);
096 return edlContext;
097 }
098
099 }