Hello Raman,
I think there's nothing out of the box for Tuscany SDOs. I did experiment with
Pojo/SDO-conversion a while back based on the Eclipse example you cite.
I use a common base class Pojo for all the pojos and customize my jaxb bindings
with a <xjc:superclass> annotation in bindings.xjb. This base class
contains toXML() and fromXML() methods implemented in the usual JAXB way.
A PojoSDOBridge for Tuscany then can be implemented like this:
/**
* Convert an SDO to a bean via the shared XML representation.
* <p>
* Implementation note: Does not depend on EclipseLink JAXBContextHelper,
only on standard JAXB.
* @param sdo
* @return the bean of the corresponding type
* @throws JAXBException
* @throws ClassNotFoundException
*/
public static Pojo toPojo( DataObject sdo ) throws JAXBException,
ClassNotFoundException
{
SDOHelper helper = SDOHelperFactory.getHelper();
String xml = helper.toXML( sdo, null );
Class<? extends Pojo> clazz = Pojo.load( sdo.getType().getURI(),
sdo.getType().getName() );
Pojo bean = Pojo.fromXML( xml, clazz );
return bean;
}
/**
* Convert a bean to an SDO via the shared XML representation.
* <p>
* Implementation note: Does not depend on EclipseLink JAXBContextHelper,
only on Tuscany's SDO implementation.
* @param bean
* @return the SDO of the corresponding type
* @throws JAXBException
* @throws ClassNotFoundException
*/
public static DataObject toSDO( Pojo bean ) throws JAXBException,
ClassNotFoundException
{
String xml = bean.toXML();
// The generated XML contains an xsi:type element, so the XML can be
unmarshalled to an SDO of that type
XMLHelper xmlHelper = HelperProvider.getDefaultContext().getXMLHelper();
XMLDocument xmlDoc = xmlHelper.load( xml );
DataObject sdo = xmlDoc.getRootObject();
return sdo;
}
For loading the pojo class, one must find the FQCN corresponding to the given
type and namespace. That can be a challenge.
XJC does it, but I haven't had time to figure out how exactly. I came up with a
simplification that works in most cases. I'd be
grateful for a better suggestion:
/**
* Constructs the fully qualified class name corresponding to the given
type's namespace and name.
* <p>
* Intended as an analogue to what xjc does.
* @param namespace must be a valid HTTP-URL. Used to contruct the package
name.
* @param typeName the simple name of a type belonging to the namespace.
Corresponds to the simple class name.
* @return the fully qualified class name
*/
// TODO find a utility library that does EXACTLY the same as XJC, even for
arbitrary URL's.
private static final String fullyQualifiedClassName( String namespace, String
typeName )
{
URL url;
try {
url = new URL( namespace );
}
catch( MalformedURLException e ) {
throw new IllegalStateException( "Namespace must be a valid URL", e );
}
if( !url.getProtocol().equals( "http" ) ) {
throw new IllegalArgumentException( "Namespace must be an HTTP-URL, not "
+ url );
}
String packagePrefix = join( reverse( url.getHost().split( "\\." ) ), '.' );
String packageSuffix = url.getPath().replaceAll( "/", "." );
String className = packagePrefix + packageSuffix + "." + typeName;
return className;
}
Hope that gets you started. Perhaps something like this would be worth
including in a Tuscany utility class?
Best Regards,
Sebastian
From: Malisetti, Ramanjaneyulu [mailto:[email protected]]
Sent: Wednesday, May 15, 2013 10:35 AM
To: [email protected]
Subject: JAXBHelperContext, the POJO/SDO bridge for Tuscany SDO
Hi,
Is there POJO/SDO bridge for Tuscany SDO API like one discussed at
http://wiki.eclipse.org/EclipseLink/Examples/SDO/JAXB.
We use SDO as data model for services, but some people have problem with
dealing dynamic DataObjects. So, I am looking for conversion from static
DataObject to dynamic DataObject or POJO to SDO.
Regards
Raman
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