asked on

Processing xsd file with JAXB

Hello!

I would like to process an xsd file using JAXB and get to the first element to find its name (in the schema itself. How would I go about doing this in JAXB? It should be a few lines of code...

So far I have:

package blog.jaxb.validation;   
import java.io.File; 
import javax.xml.XMLConstants; 
import javax.xml.bind.JAXBContext; 
import javax.xml.bind.Unmarshaller; 
import javax.xml.validation.Schema; 
import javax.xml.validation.SchemaFactory;   
public class UnmarshalDemo 
{       
	public static void main(String[] args) throws Exception {         
		SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);          
		Schema schema = sf.newSchema(new File("customer.xsd"));            
		JAXBContext jc = JAXBContext.newInstance(Customer.class);           
		Unmarshaller unmarshaller = jc.createUnmarshaller();         
		unmarshaller.setSchema(schema);         
		unmarshaller.setEventHandler(new MyValidationEventHandler());         
		Customer customer = (Customer) unmarshaller.unmarshal(new File("input.xml"));     
	}   
}

Open in new window

Thing is, all the examples that I saw are for using the xsd to validate xml. Here what I am trying to do is access the information in the schema itself!

thanks,
Ron

GenroseSusai

For e.g...

JAXBElement<?> poElement =
JAXBElement<?>)u.unmarshal(
new FileInputStream( "input.xml" ) );
SomeType st = (
SomeType)poElement.getValue();
SomeField field = st.getSomeField();

ronyosi

ASKER

Hi,

Thanks for the reply :)
How do I avoid this SomeType/SomeField.
Note that the schemas that I will be loading are somewhat random and only have in common that specific tag that I am trying to inspect. Therefore the
"JAXBContext jc = JAXBContext.newInstance(Customer.class); "
and
SomeField/SomeType does not work because java does not know what that is...

Ron

Mick Barry

you can use the XSOM Parser
http://it.toolbox.com/blogs/enterprise-web-solutions/parsing-an-xsd-schema-in-java-32565

ASKER CERTIFIED SOLUTION

ronyosi

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

ronyosi

ASKER

thanks everyone for your help. I found an answer on google that showed me why to pick DOM4J that it is actually less expensive in terms of memory/computation.