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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

/*
 * DOMUtils.java
 *
 * Created on May 7th 2002
 */

package com.sun.tools.xjc.util;

import java.util.ArrayList;

import javax.xml.namespace.QName;

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


/**
 * 
 * @author  Vivek Pandey
 * @version 1.0
 *
 */
public class DOMUtils {
    /** Gets the fist child of the given name, or null. */
    public static Element getFirstChildElement( Element parent, String nsUri, String localPart ) {
        NodeList children = parent.getChildNodes();
        for( int i=0; i= 1)
      return (Element)children.item(0);
    return null;
  }

  public static Element getElement(Document parent, QName qname){
    NodeList children = parent.getElementsByTagNameNS(qname.getNamespaceURI(), qname.getLocalPart());
    if(children.getLength() >= 1)
      return (Element)children.item(0);
    return null;
  }

  public static Element getElement(Document parent, String namespaceURI, 
                       String localName) {
    NodeList children = parent.getElementsByTagNameNS(namespaceURI, localName);
    if(children.getLength() >= 1)
      return (Element)children.item(0);
    return null;
  }

// these implementations look wrong to me, since getElementsByTagName returns
// all the elements in descendants, not just children.
//
//   public static Element[] getChildElements(Element parent, QName qname) {
//    NodeList children = parent.getElementsByTagNameNS(qname.uri, qname.localpart);
//    return getElements(children);
//  }
//
//  public static Element[] getChildElements(Element parent, String namespaceURI, 
//                       String localName) {
//    NodeList children = parent.getElementsByTagNameNS(namespaceURI, localName);
//    return getElements(children);
//  }
//
//  public static Element[] getChildElements(Element parent, String name) {
//    NodeList children = parent.getElementsByTagName(name);
//    return getElements(children);
//  }
  
    public static Element[] getElements(NodeList children) {
        Element[] elements = null;
        int len = 0;
        for (int i = 0; i < children.getLength(); ++i) {
            if (elements == null)
                elements = new Element[1];
            if (elements.length == len) {
                Element[] buf = new Element[elements.length + 1];
                System.arraycopy(elements, 0, buf, 0, elements.length);
                elements = buf;
            }
            elements[len++] = (Element)children.item(i);
        }
        return elements;
    }
}