001    /**
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package org.apache.geronimo.converter;
018    
019    import org.w3c.dom.Element;
020    import org.w3c.dom.NodeList;
021    import org.w3c.dom.Node;
022    
023    /**
024     * Some helper methods for reading DOM trees.  Have I written this like 8 times or what?
025     *
026     * @version $Rev: 547737 $ $Date: 2007-06-15 12:47:19 -0400 (Fri, 15 Jun 2007) $
027     */
028    public class DOMUtils {
029        public static String getChildText(Element parent, String childName) {
030            NodeList list = parent.getElementsByTagName(childName);
031            if(list.getLength() > 1) {
032                throw new IllegalStateException("Multiple child elements with name " + childName);
033            } else if(list.getLength() == 0) {
034                return null;
035            }
036            Element child = (Element) list.item(0);
037            return getText(child);
038        }
039    
040        public static String getText(Element element) {
041            StringBuffer buf = new StringBuffer();
042            NodeList list = element.getChildNodes();
043            boolean found = false;
044            for(int i=0; i<list.getLength(); i++) {
045                Node node = list.item(i);
046                if(node.getNodeType() == Node.TEXT_NODE) {
047                    buf.append(node.getNodeValue());
048                    found = true;
049                }
050            }
051            return found ? buf.toString() : null;
052        }
053    }