001/**
002 * Copyright 2005-2016 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 */
016package org.kuali.rice.edl.impl.components;
017
018import java.util.List;
019
020import org.apache.commons.lang.StringUtils;
021import org.kuali.rice.edl.impl.EDLContext;
022import org.kuali.rice.edl.impl.EDLModelComponent;
023import org.kuali.rice.edl.impl.EDLXmlUtils;
024import org.kuali.rice.edl.impl.RequestParser;
025import org.w3c.dom.Document;
026import org.w3c.dom.Element;
027
028
029/**
030 * Handles setting the current page in the EDL XML.
031 *
032 * @author Kuali Rice Team (rice.collab@kuali.org)
033 *
034 */
035public class PageHandler implements EDLModelComponent {
036
037        public static final String CURRENT_PAGE = "currentPage";
038        public static final String PREVIOUS_PAGE = "previousPage";
039        public static final String GOTO_PAGE = "edl.gotoPage";
040        
041        public void updateDOM(Document dom, Element configElement, EDLContext edlContext) {
042            String currentPage = edlContext.getRequestParser().getParameterValue("edl." + CURRENT_PAGE);
043            String previousPage = edlContext.getRequestParser().getParameterValue("edl." + PREVIOUS_PAGE);
044            String gotoPage = findGotoPage(edlContext.getRequestParser(), currentPage);
045            if (!StringUtils.isBlank(gotoPage)) {
046                previousPage = currentPage;
047                currentPage = gotoPage;
048            }
049            establishCurrentPage(dom, currentPage);
050            establishPreviousPage(dom, previousPage);
051        }
052        
053        /**
054         * Find parameter that looks like gotoPage:<pageName>
055         */
056        private String findGotoPage(RequestParser requestParser, String currentPage) {
057            List<String> parameterNames = requestParser.getParameterNames();
058            for (String parameterName : parameterNames) {
059                if (parameterName.startsWith(GOTO_PAGE + ":")) {
060                    return parameterName.split(":")[1];
061                }
062            }
063            return null;
064        }
065
066        private void establishCurrentPage(Document dom, String currentPage) {
067            if (!StringUtils.isBlank(currentPage)) {
068                Element currentPageElement = EDLXmlUtils.getOrCreateChildElement(dom.getDocumentElement(), CURRENT_PAGE, true);
069                currentPageElement.appendChild(dom.createTextNode(currentPage));
070            }
071        }
072        
073
074        private void establishPreviousPage(Document dom, String previousPage) {
075            if (!StringUtils.isBlank(previousPage)) {
076                Element previousPageElement = EDLXmlUtils.getOrCreateChildElement(dom.getDocumentElement(), PREVIOUS_PAGE, true);
077                previousPageElement.appendChild(dom.createTextNode(previousPage));
078            }
079        }
080            
081
082}