Return the first element child with the specified qualified name. : DOM Element « XML « Java Tutorial

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.OutputStream;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * Few simple utils to read DOM. This is originally from the Jakarta Commons
 * Modeler.
 * 
 * @author Costin Manolache
 */
public class Utils {
  /**
   * Return the first element child with the specified qualified name.
   * 
   * @param parent
   * @param ns
   * @param lp
   * @return
   */
  public static Element getFirstChildWithName(Element parent, String ns, String lp) {
      for (Node n = parent.getFirstChild(); n != null; n = n.getNextSibling()) {
          if (n instanceof Element) {
              Element e = (Element)n;
              String ens = (e.getNamespaceURI() == null) ? "" : e.getNamespaceURI();
              if (ns.equals(ens) && lp.equals(e.getLocalName())) {
                  return e;
              }
          }
      }
      return null;
  }
}