Serializing Attribute nodes

[Desmond Whewell (CV/ETL)]

I have a requirement to serialize parts of an XML document, either the
whole document or an element or an attribute. My code works fine for
documents and elements, but fails for attributes. If I try to serialize
an attribute node, no output is generated. I expected the value of the
attribute to be written, e.g. for <... Fred="hello"> , I expected
"hello" to be serialized.

Why does this not happen?

I am using xerces 2.8.1 and Java 1.5_04

Here is some test code that reflects my usage.

START_OF_CODE
package test;

import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSOutput;
import org.w3c.dom.ls.LSSerializer;
import org.xml.sax.InputSource;

public class Test {

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args)
        throws Exception {

        // Dummy document
        StringBuffer sb = new StringBuffer();
        sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"  ?>");
        sb.append("<wrapperRoot>");
        sb.append("<wrapperElem wrapperAtt=\"hello\">");
        sb.append("</wrapperElem>");
        sb.append("</wrapperRoot>");

        // Parse dummy document
        Document newdoc = null;
        try {
            DocumentBuilderFactory fa =
DocumentBuilderFactory.newInstance();
            fa.setNamespaceAware(true);
            fa.setFeature(
 
"http://apache.org/xml/features/dom/defer-node-expansion";,
                false);
            DocumentBuilder parser = null;
            parser = fa.newDocumentBuilder();
            InputSource inputSource = new InputSource(new StringReader(
                sb.toString()));
            inputSource.setEncoding("UTF-8");
            newdoc = parser.parse(inputSource);
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }

        // Document - This works
        doSerialize(newdoc, true);
        System.out.println();

        // Root Element- This works
        doSerialize(newdoc.getDocumentElement(), false);
        System.out.println();

        // Element - This works
        doSerialize(newdoc.getDocumentElement().getFirstChild(), false);
        System.out.println();

        // Attribute - This does not work, nothing is written to 'out'
 
doSerialize(newdoc.getDocumentElement().getFirstChild().getAttributes().
item(0), false);
        System.out.println();
    }

    public static void doSerialize(Node node, boolean xmlDecl)
        throws Exception {

        // Get DOM Implementation using DOM Registry
        System.setProperty(DOMImplementationRegistry.PROPERTY,
            "org.apache.xerces.dom.DOMXSImplementationSourceImpl");
        DOMImplementationRegistry registry;
        registry = DOMImplementationRegistry.newInstance();
        DOMImplementationLS impl = (DOMImplementationLS)
registry.getDOMImplementation("LS");

        // Create and configure an LSSerializer
        LSSerializer lSSerializer = impl.createLSSerializer();
        DOMConfiguration config = lSSerializer.getDomConfig();
        config.setParameter("xml-declaration", xmlDecl);
        config.setParameter("format-pretty-print", false);
        lSSerializer.setNewLine("\n");

        // Create an output sink
        LSOutput lSOutput = impl.createLSOutput();
        lSOutput.setByteStream(System.out);
        lSOutput.setEncoding("UTF-8");

        // Serialise...
        lSSerializer.write(node, lSOutput);
    }
}
END_OF_CODE



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