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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 nu.xom.Attribute;
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import nu.xom.Document;
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import nu.xom.Element;
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import nu.xom.NodeFactory;
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* Demonstrates a custom <code>NodeFactory</code> that adds
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* ID attributes to all elements that don't already have one.
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* This is inspired by Example 8-12 in
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* <cite>Processing XML with Java</cite>.
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* In brief, it demonstrates that major modifications
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* may have to take place in <code>endElement</code> but can still
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* be effectively streamed.
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* @author Elliotte Rusty Harold
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public class IDFilter extends NodeFactory {
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private int counter = 0;
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public Document startMakingDocument() {
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return super.startMakingDocument();
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public Nodes finishMakingElement(Element element) {
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Attribute id = element.getAttribute("id");
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id = new Attribute("id", "p" + counter);
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element.addAttribute(id);
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return new Nodes(element);