Find Element Or Create And Set Attribute : DOM Attribute « XML « Java Tutorial

1. Java Tutorial
2. XML
3. DOM Attribute

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;

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

/*******************************************************************************
 * Copyright (C) 2007 Google Inc.
 * 
 * Licensed 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.
 ******************************************************************************/

/**
 * Various XML utilities.
 * 
 * @author simonjsmith, ksim
 * @version 1.1 - ksim - March 6th, 2007 - Added functions regarding streaming
 * @version 1.2 - ksim - March 10th, 2007 - Added functions regarding DOM
 *          manipulation
 */
public class Utils {
  public static Element findElementElseCreateAndSetAndAttribute(
      Document document, Element parent, String element, String value,
      String attributeName, String attributeValue) {

    Element e = findElementElseCreateAndAttribute(document, parent,
        element, attributeName, attributeValue);
    if (e != null)
      e.appendChild(document.createTextNode(value));

    return e;
  }
  public static Element findElementElseCreateAndAttribute(Document document,
      Element parent, String element, String attributeName,
      String attributeValue) {
    NodeList nl = parent.getElementsByTagName(element);
    Element e = null;

    if (nl.getLength() == 0) {
      parent.appendChild(document.createElement(element));
      e = (Element) parent.getElementsByTagName(element).item(0);
      e.setAttribute(attributeName, attributeValue);
    }

    return e;
  }

}