[jboss-dev-forums] [Design of POJO Server] - JAXB Deployer

[anil.saldhana@jboss.com]

I have an independent JAXB model for configuration from a separate project called as JBossXACML (which does not have any dependencies on JBossXB).

As part of https://jira.jboss.org/jira/browse/JBAS-6607, I tried using the SchemaResolvingDeployer but it was unable to locate the schema. Additionally, registering with JBossXB is a noop because my metadata does not have the @JBossxml annotation.

Given this, I looked at the JAXBDeployer http://anonsvn.jboss.org/repos/jbossas/projects/jboss-deployers/tags/2.0.5.GA/deployers-vfs-spi/src/main/java/org/jboss/deployers/vfs/spi/deployer/JAXBDeployer.java in deployers which is an abstract class.  The issue with this is that if the JAXB metadata has a root of JAXBElement from the following schema:
http://anonsvn.jboss.org/repos/jbossas/projects/security/security-xacml/trunk/jboss-xacml/src/main/resources/schema/jbossxacml-2.0.xsd
then the JAXBDeployer create method falls apart because it tries to instantiate JAXBElement.

Issue with JAXBDeployer:
"context" and "properties"  need to made protected.

My JAXBElementParsingDeployer looks as follows:

 
  | package org.jboss.security.deployers;
  | 
  | import java.io.InputStream;
  | import java.util.Map;
  | 
  | import javax.xml.bind.JAXBContext;  
  | import javax.xml.bind.Unmarshaller;
  | 
  | import org.jboss.deployers.vfs.spi.deployer.JAXBDeployer;
  | import org.jboss.deployers.vfs.spi.structure.VFSDeploymentUnit; 
  | import org.jboss.virtual.VirtualFile;
  | import org.xml.sax.InputSource;
  | 
  | /**
  |  * A parsing deployer that is capable of parsing
  |  * a JAXB model with the root element being
  |  * JAXBElement<T>
  |  */
  | @SuppressWarnings("unchecked")
  | public class JAXBElementParsingDeployer<T,V> extends JAXBDeployer 
  | {
  |    /** The JAXBContext */ 
  |    protected JAXBContext context;
  | 
  |    /** The properties */
  |    protected Map<String, Object> properties;
  |    
  |    protected Class<V> enclosed;
  |     
  |    /**
  |     * CTR
  |     * @param output  JAXBElement.class
  |     * @param enclosed Type enclosed by JAXBElement
  |     */
  |    public JAXBElementParsingDeployer(Class<T> output, Class<V> enclosed)
  |    {
  |       super(output); 
  |       this.enclosed = enclosed;
  |    } 
  |    
  |    /**
  |     * Create lifecycle
  |     * 
  |     * @throws Exception for any problem
  |     */
  |    @Override
  |    public void create() throws Exception
  |    {
  |       if (properties != null)
  |          context = JAXBContext.newInstance(new Class[] {enclosed}, properties);
  |       else
  |          context = JAXBContext.newInstance(enclosed);
  |    } 
  | 
  |    /**
  |     * Destroy lifecycle
  |     */
  |    public void destroy()
  |    {
  |       context = null;
  |    }
  | 
  |    @Override
  |    protected Object parse(VFSDeploymentUnit unit, VirtualFile file, Object root) throws Exception
  |    {
  |       Unmarshaller unmarshaller = context.createUnmarshaller();
  |       InputStream is = openStreamAndValidate(file);
  |       try
  |       {
  |          InputSource source = new InputSource(is);
  |          source.setSystemId(file.toURI().toString());
  |          Object o = unmarshaller.unmarshal(source);
  |          return getOutput().cast(o);
  |       }
  |       finally
  |       {
  |          try
  |          {
  |             is.close();
  |          }
  |          catch (Exception ignored)
  |          {
  |          }
  |       }
  |    } 
  | }
  | 

So if "context" and "properties" are made protected members of the JAXBDeployer then I can just override the create method to avoid the duplicated parse.

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