Returns a Properties object matching the given node : Properties « Collections « Java Tutorial

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/**
 * EasyBeans
 * Copyright (C) 2006 Bull S.A.S.
 * Contact: easybeans@ow2.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * --------------------------------------------------------------------------
 * $Id: XMLUtils.java 2049 2007-11-20 14:32:56Z benoitf $
 * --------------------------------------------------------------------------
 */


import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

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

/**
 * Class with some useful methods on XML document.
 */
public final class XMLUtils {

  /**
   * Returns a Properties object matching the given node.
   * @param ns the namespace.
   * @param base the element from where to search.
   * @param name of the element to get.
   * @return the value of this element.
   */
  public static Properties getPropertiesValueElement(final String ns, final Element base, final String name) {
      Properties returnedProperties = new Properties();

      // Get element
      NodeList list = base.getElementsByTagNameNS(ns, name);
      if (list.getLength() == 1) {
          Element element = (Element) list.item(0);

          // Get property element
          NodeList properties = element.getElementsByTagNameNS(ns, "property");

          // If properties is present, analyze them and add them
          if (properties.getLength() > 0) {
              for (int i = 0; i < properties.getLength(); i++) {
                  Element elemProperty = (Element) properties.item(i);
                  String pName = getAttributeValue(elemProperty, "name");
                  String pValue = getAttributeValue(elemProperty, "value");
                  if (pName != null && pValue != null) {
                      returnedProperties.setProperty(pName, pValue);
                  }

              }
          }
      } else if (list.getLength() > 1) {
          throw new IllegalStateException("Element '" + name + "' on '" + base + "' should be unique but there are '"
                  + list.getLength() + "' elements");
      }

      return returnedProperties;
  }
  /**
   * Returns the value of the attribute of the given element.
   * @param base the element from where to search.
   * @param name of the attribute to get.
   * @return the value of this element.
   */
  public static String getAttributeValue(final Element base, final String name) {

      // get attribute of this element...
      NamedNodeMap mapAttributes = base.getAttributes();
      Node node = mapAttributes.getNamedItem(name);
      if (node != null) {
          return node.getNodeValue();
      }
      return null;
  }
}