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