/* Copyright 2002-2004 Elliotte Rusty Harold
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* Demonstrates a custom NodeFactory
that normalizes
* all white space in text nodes and attribute values.
* Normalization involves stripping all leading and trailing white
* space, converting all tabs, carriage returns, and line feeds to a
* single space each, and then converting all remaining runs of white
* space to a single space. Text nodes that contain nothing after
* this process is applied are not created. This may be useful for
* record-like XML.
*
* This class does not perform * Unicode normalization. *
* * @author Elliotte Rusty Harold * @version 1.0 * */ public class NormalizingFactory extends NodeFactory { private Nodes empty = new Nodes(); // We don't need text nodes at all public Nodes makeText(String data) { data = normalizeSpace(data); if ("".equals(data)) return empty; return super.makeText(data); } public Nodes makeAttribute(String name, String URI, String value, Attribute.Type type) { value = normalizeSpace(value); return super.makeAttribute(name, URI, value, type); } // not the most efficient implementation private static String normalizeSpace(String data) { data = data.replace('\t', ' '); data = data.replace('\n', ' '); data = data.replace('\r', ' '); data = data.trim(); StringBuilder result = new StringBuilder(); for (int i = 0; i < data.length(); i++) { if (i == 0 || data.charAt(i-1) != ' ' || data.charAt(i) != ' ') { result.append(data.charAt(i)); } } return result.toString(); } public static void main(String[] args) { if (args.length == 0) { System.out.println( "Usage: java nu.xom.samples.NormalizingFactory URL" ); return; } Builder builder = new Builder(new NormalizingFactory()); try { Document doc = builder.build(args[0]); Serializer serializer = new Serializer(System.out); serializer.write(doc); } // indicates a well-formedness error catch (ParsingException ex) { System.out.println(args[0] + " is not well-formed."); System.out.println(ex.getMessage()); } catch (IOException ex) { System.out.println(ex); } } }