A solution to get SAX InputSource from a DOM Document

["Albert Yu" <albert.yu@imtf.ie>]

 

Sometimes you need a SAX InputSource from a DOM Document object. For example, if you are using SAX parser to map XML to Java objects, but your source is a DOM Document object.

 

Here is a solution I found, in which the only problem is that it throws a RuntimeException when the transfromation fails:

 

 

public InputStream convert(org.w3c.dom.Document edoc) throws IOException {

 

        final org.w3c.dom.Document doc = edoc;
        final PipedOutputStream pos = new PipedOutputStream();
        PipedInputStream pis = new PipedInputStream();
        pis.connect(pos);

 

        (new Thread(new Runnable() {

 

            public void run() {
                try {
                    transform(doc, pos);
                }
                catch (TransformerException _ex) {
                    throw new RuntimeException("Failed to tranform org.w3c.dom.Document to PipedOutputStream", _ex);
                }
                finally {
                    try {
                        pos.close();
                    }
                    catch (IOException e) {

 

                    }
                }
            }
        }, "MyClassName.convert(org.w3c.dom.Document edoc)")).start();

 

        return pis;
    }

 

 

 private void transform(org.w3c.dom.Document edoc, PipedOutputStream pos) throws TransformerException {

 

            TransformerFactory tFactory = TransformerFactory.newInstance();
            Transformer transformer = tFactory.newTransformer();

 

            transformer.setOutputProperty("encoding", "ISO-8859-1");
            transformer.setOutputProperty("indent", "yes");

 

            transformer.transform(new DOMSource(edoc), new StreamResult(pos));

 

}

 

 

 

Best regards,

 

--
Albert Yu
( Yu Yizhuan )
Software Engineer