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

1. Java Tutorial
2. XML
3. DOM Element

import org.w3c.dom.Document;
import org.w3c.dom.Element;
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 findElementAndSetElseCreateAndSet(Document document,
      Element parent, String child, boolean value) {
    return findElementAndSetElseCreateAndSet(document, parent, child, ""
        + value);
  }

  public static Element findElementAndSetElseCreateAndSet(Document document,
      Element parent, String child, float value) {
    return findElementAndSetElseCreateAndSet(document, parent, child, ""
        + value);
  }
  public static Element findElementAndSetElseCreateAndSet(Document document,
      Element parent, String element, Date date) {
    return findElementAndSetElseCreateAndSet(document, parent, element,
        getDateString(date));
  }
  public static Element findElementAndSetElseCreateAndSet(Document document,
      Element parent, String child, String value) {
    NodeList nl = parent.getElementsByTagName(child);
    if (nl.getLength() == 0) {
      parent.appendChild(document.createElement(child));
    }
    Element ret = (Element) parent.getElementsByTagName(child).item(0);
    if (ret.getFirstChild() != null) {
      ret.removeChild(ret.getFirstChild());
    }
    ret.appendChild(document.createTextNode(value));
    return ret;
  }
}