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/* Copyright 2002-2004 Elliotte Rusty Harold
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This library is free software; you can redistribute it and/or modify
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it under the terms of version 2.1 of the GNU Lesser General Public
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License as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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Boston, MA 02111-1307 USA
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You can contact Elliotte Rusty Harold by sending e-mail to
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elharo@metalab.unc.edu. Please include the word "XOM" in the
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subject line. The XOM home page is located at http://www.xom.nu/
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package nu.xom.samples;
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import java.io.IOException;
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import nu.xom.Builder;
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import nu.xom.Document;
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import nu.xom.Element;
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import nu.xom.Attribute;
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import nu.xom.NodeFactory;
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import nu.xom.ParsingException;
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* Demonstrates walking the element hierarchy of
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* an XML document in a streaming fashion while storing state in the
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* @author Elliotte Rusty Harold
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public class StreamingElementLister extends NodeFactory{
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private int depth = 0;
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private Nodes empty = new Nodes();
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public static void main(String[] args) {
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if (args.length == 0) {
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"Usage: java nu.xom.samples.StreamingElementLister URL"
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Builder builder = new Builder(new StreamingElementLister());
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builder.build(args[0]);
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catch (ParsingException ex) {
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System.out.println(args[0] + " is not well-formed.");
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System.out.println(ex.getMessage());
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catch (IOException ex) {
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System.out.println(ex);
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// We don't need the comments.
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public Nodes makeComment(String data) {
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// We don't need text nodes at all
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public Nodes makeText(String data) {
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public Element startMakingElement(String name, String namespace) {
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System.out.println(name);
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return new Element(name, namespace);
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public Nodes finishMakingElement(Element element) {
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if (element.getParent() instanceof Document) {
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return new Nodes(element);
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public Nodes makeAttribute(String name, String URI,
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String value, Attribute.Type type) {
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public Nodes makeDocType(String rootElementName,
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String publicID, String systemID) {
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public Nodes makeProcessingInstruction(
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String target, String data) {
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private void printSpaces() {
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for (int i = 0; i <= depth; i++) {
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System.out.print(' ');