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.ArrayList;
019import java.util.List;
020
021import org.apache.commons.lang.StringUtils;
022import org.kuali.rice.edl.impl.EDLContext;
023import org.kuali.rice.edl.impl.EDLModelComponent;
024import org.kuali.rice.edl.impl.RequestParser;
025import org.kuali.rice.edl.impl.UserAction;
026import org.w3c.dom.Document;
027import org.w3c.dom.Element;
028import org.w3c.dom.NodeList;
029
030public class RefreshFromLookupComponent implements EDLModelComponent {
031        
032        public void updateDOM(Document dom, Element configElement, EDLContext edlContext) {
033                String command = edlContext.getUserAction().getAction();
034                if (UserAction.ACTION_REFRESH_FROM_LOOKUP.equals(command)) {
035                        RequestParser requestParser = edlContext.getRequestParser();
036                        
037                        Element currentVersion = VersioningPreprocessor.findCurrentVersion(dom);
038                        // First, create a list of all of the <field> tags that match the parameter names returned from the lookup
039                        List<Element> fieldsToDelete = new ArrayList<Element>();
040                        NodeList fieldNodes = currentVersion.getElementsByTagName("field");
041                        
042                        // get the list of input parameters returned from the lookup so we can clear empty ones as well
043                        List<String> requestParameterNames = requestParser.getParameterNames();
044                        
045                        for (int i = 0; i < fieldNodes.getLength(); i++) {
046                                Element fieldNode = (Element) fieldNodes.item(i);
047                                String fieldName = fieldNode.getAttribute("name");
048                                if (requestParameterNames.contains(fieldName)) {
049                                        fieldsToDelete.add(fieldNode);
050                                }
051                        }
052                        
053                        // Second, delete those nodes; we will rely on normal population to recreate those nodes
054                        // if the nodes weren't deleted, EDL would continue to display the old value on the generated output
055                        for (Element fieldToDelete : fieldsToDelete) {
056                                currentVersion.removeChild(fieldToDelete);
057                        }
058                }
059        }
060}