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Java example source code file (DOMUtils.java)

This example Java source code file (DOMUtils.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

arraylist, dom, domexception, domutils, element, nodelist, qname, string, util

The DOMUtils.java Java example source code

/*
 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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

package com.sun.tools.internal.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;
    }
}

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