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 javax.xml.xpath.XPathFactory;
031 import java.util.Stack;
032
033
034 /**
035 * Contains a stack of EDLControllers. Allows EDL components to add new controllers to the chain runtime. The idea
036 * being that this is how you would page between edls. Uses the template associated with the last edl controller
037 * to render the dom of the last edl controller.
038 *
039 * @author Kuali Rice Team (rice.collab@kuali.org)
040 *
041 */
042 public class EDLControllerChain {
043
044 private static final Logger LOG = Logger.getLogger(EDLControllerChain.class);
045
046 private Stack<EDLController> edlControllers = new Stack<EDLController>();
047
048 public void renderEDL(RequestParser requestParser, HttpServletResponse response) throws Exception {
049 EDLController edlController = edlControllers.pop();
050 edlController.setEdlContext(getInitialEDLContext(edlController, requestParser, edlController.getStyle().newTransformer()));
051
052 Document dom = edlController.notifyComponents();
053 if (edlControllers.isEmpty()) {
054 transform(edlController.getEdlContext(), dom, response);
055 } else {
056 renderEDL(requestParser, response);
057 }
058 }
059
060 public void addEdlController(EDLController edlController) {
061 edlControllers.add(edlController);
062 }
063
064 private void transform(EDLContext edlContext, Document dom, HttpServletResponse response) throws Exception {
065 if (StringUtils.isNotBlank(edlContext.getRedirectUrl())) {
066 response.sendRedirect(edlContext.getRedirectUrl());
067 return;
068 }
069 response.setContentType("text/html; charset=UTF-8");
070 Transformer transformer = edlContext.getTransformer();
071
072 transformer.setOutputProperty("indent", "yes");
073 transformer.setOutputProperty(OutputKeys.INDENT, "yes");
074 String user = null;
075 String loggedInUser = null;
076 if (edlContext.getUserSession() != null) {
077 Person wu = edlContext.getUserSession().getPerson();
078 if (wu != null) user = wu.getPrincipalId();
079 wu = edlContext.getUserSession().getPerson();
080 if (wu != null) loggedInUser = wu.getPrincipalId();
081 }
082 transformer.setParameter("user", user);
083 transformer.setParameter("loggedInUser", loggedInUser);
084 if (LOG.isDebugEnabled()) {
085 LOG.debug("Transforming dom " + XmlJotter.jotNode(dom, true));
086 }
087 transformer.transform(new DOMSource(dom), new StreamResult(response.getOutputStream()));
088 }
089
090 private EDLContext getInitialEDLContext(EDLController edlController, RequestParser requestParser, Transformer transformer) {
091 EDLContext edlContext = new EDLContext();
092 edlContext.setEdlControllerChain(this);
093 edlContext.setEdocLiteAssociation(edlController.getEdocLiteAssociation());
094 edlContext.setUserSession(GlobalVariables.getUserSession());
095 edlContext.setTransformer(transformer);
096 edlContext.setRequestParser(requestParser);
097 edlContext.setXpath(XPathFactory.newInstance().newXPath());
098 return edlContext;
099 }
100
101 }