stax xml validation

Question

I know I can validate xml-file when I use sax. But can I validate when I use Stax?

Answer 1

You can parse and validate with StAX in one pass. Use javax.xml.stream.util.StreamReaderDelegate:

 XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(new FileInputStream  ("test.xml"));

 reader = new StreamReaderDelegate(reader) {
     public int next() throws XMLStreamException {
          int n = super.next();

          // process event

          return n;
     }};

 SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
 Schema schema = factory.newSchema(new File("test.xsd"));
 Validator validator = schema.newValidator();
 validator.validate(new StAXSource(reader));

Validator reads test.xml calling reader.next() and you process parsing events as usual.