[jdom-interest] A hack for DTD validating a modified DOM
marc at anyware.co.uk
Mon Jan 10 04:08:44 PST 2005
I'm reasonably new to JDOM but had some good progress very quickly.
I haven't noticed this in the archive, and a few people have asked about
how to validate a DOM that has been constructed/modified
programmatically against a DTD (or Schema).
I was going to ask this on the list myself until I hit upon the ugly,
but reliable and immediately available solution - write the DOM out to a
stream and load it back in again with validation.
* Re-validate the DOM
public void validate(Document doc) throws JDOMException
XMLOutputter out = new XMLOutputter();
ByteArrayOutputStream tempOutstream = new
ByteArrayOutputStream(50000); // Adjust for approx doc size
out.output( doc, tempOutstream);
byte buff = tempOutstream.toByteArray();
SAXBuilder builder = newSAXBuilder(true);
// Do the validation and discard resulting doc
Document d = builder.build(new ByteArrayInputStream(buff),
catch ( IOException e )
throw new JDOMException( "Failed to validate, error writing
to memory stream", e);
It hurts to write such a hack - it there was any way to get a parser (or
JDOM) to validate against a DTD/Schema by invoking some "validate"
method, it would be great - but it's a problem of validation being part
of (today's) parsers surely?
Does anyone know if there are moves to separate parsing +
well-formedness checks from validation, in terms of APIs?
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