DOMUtils.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. 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_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [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
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

/*
 * 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<children.getLength(); i++ ) {
            Node item = children.item(i);
            if(!(item instanceof Element ))     continue;
            
            if(nsUri.equals(item.getNamespaceURI())
            && localPart.equals(item.getLocalName()) )
                return (Element)item;
        }
        return null;
    }
    
    /** Gets the child elements of the given name. */
    public static Element[] getChildElements(Element parent, String nsUri, String localPart ) {
        ArrayList a = new ArrayList();
        NodeList children = parent.getChildNodes();
        for( int i=0; i<children.getLength(); i++ ) {
            Node item = children.item(i);
            if(!(item instanceof Element ))     continue;
            
            if(nsUri.equals(item.getNamespaceURI())
            && localPart.equals(item.getLocalName()) )
                a.add(item);
        }
        return (Element[]) a.toArray(new Element[a.size()]);
    }
    
    /** Gets all the child elements. */
    public static Element[] getChildElements( Element parent ) {
        ArrayList a = new ArrayList();
        NodeList children = parent.getChildNodes();
        for( int i=0; i<children.getLength(); i++ ) {
            Node item = children.item(i);
            if(!(item instanceof Element ))     continue;
            
            a.add(item);
        }
        return (Element[]) a.toArray(new Element[a.size()]);
    }
    
    
  public static String getElementText(Element element) throws DOMException{
    for (Node child = element.getFirstChild(); child != null;
     child = child.getNextSibling()) {
      if(child.getNodeType() == Node.TEXT_NODE)
    return child.getNodeValue();      
    }
    return element.getNodeValue();
  }

  public static Element getElement(Document parent, String name){
    NodeList children = parent.getElementsByTagName(name);
    if(children.getLength() >= 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;
  }
  
    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;
    }
}