/*
    * Copyright 2004-2009 the original author or authors.
    *
    * 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.
   */
  
  package org.springmodules.validation.util.xml;
  
  import java.util.Iterator;
  
  import org.w3c.dom.Element;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  
  /**
   * Utility methods/functions to deal with org.w3c.dom constructs.
   *
   * @author Uri Boness
   */
  public class DomUtils {
  
      public static Element firstChildElement(Element element) {
          Iterator iter = childElements(element);
          return (iter.hasNext()) ? (Element) iter.next() : null;
      }
  
      public static Iterator childElements(Element element) {
          return new SubElementsIterator(element);
      }
  
      public static Iterator childNodes(Node node) {
          return new ChildNodesIterator(node);
      }
  
      public static Element getSingleSubElement(Element parent, String elementNamespace, String localName) {
          NodeList nodes = parent.getElementsByTagNameNS(elementNamespace, localName);
          return (nodes.getLength() > 0) ? (Element) nodes.item(0) : null;
      }
  
      // this class should not be instanciated.
      private DomUtils() {
      }
  
  }