SchemaBindingInitializer

Version 7

Created by adrian.brock on Jan 27, 2006 10:33 AM. Last modified by starksm64 on Mar 9, 2006 1:31 AM.

SchemaBindingInitializer

Motivation

As schemas are used together, but evolve independently, there is a strong reason to not have to reference the schema file names and location in your xml or client code.

Example from the AOP testsuite using the Microcontainer to construct aspects:

<?xml version="1.0" encoding="UTF-8"?>

<aop xmlns="urn:jboss:aop-deployer">

   <interceptor name="SimpleInterceptor">
      <class>
         <beanfactory xmlns="urn:jboss:bean-deployer" class="org.jboss.test.kernel.SimpleInterceptor">
            <constructor>
               <parameter>Hello</parameter>
            </constructor>
            <property name="second">World</property>
         </beanfactory>
      </class>
   </interceptor>

   <bind pointcut="execution(* org.jboss.test.kernel.Aspectized->*(..))">
      <interceptor-ref name="SimpleInterceptor"></interceptor-ref>
   </bind>

   <introduction class="org.jboss.test.Kernel.Aspectized">
      <mixin>
         <interfaces>org.jboss.Intf1,org.jboss.Intf2</interfaces>
         <class>org.jboss.Mixin</class>
         <construction>new org.jboss.Mixin()</construction>
      </mixin>
   </introduction>

</aop>

The client code that deploy this:

/*
* JBoss, Home of Professional Open Source
* Copyright 2006, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.aspects.kernel.schema;

import java.net.URL;

import org.jboss.aop.AspectManager;
import org.jboss.kernel.Kernel;
import org.jboss.xb.binding.Unmarshaller;
import org.jboss.xb.binding.UnmarshallerFactory;
import org.jboss.xb.binding.sunday.unmarshalling.SchemaBindingResolver;
import org.jboss.xb.binding.sunday.unmarshalling.SingletonSchemaResolverFactory;

/**
 * AspectLoader.
 * 
 * @author <a href="adrian@jboss.com">Adrian Brock</a>
 * @author <a href="mailto:bill@jboss.org">Bill Burke</a>
 * @version $Revision: 1.1 $
 */
public class AspectLoader
{
   /** The unmarshaller factory */
   private static final UnmarshallerFactory factory = UnmarshallerFactory.newInstance();
   
   /** The resolver */
   private static final SchemaBindingResolver resolver = SingletonSchemaResolverFactory.getInstance().getSchemaBindingResolver();
   
   /**
    * Load an aspect xml
    * 
    * @param url the url
    * @param kernel the kernel
    * @param manager the aspect manager
    * @throws Exception for any error
    */
   public static void loadXml(URL url, Kernel kernel, AspectManager manager) throws Exception
   {
      DeploymentInfo di = new DeploymentInfo(kernel, url.toString(), manager);
      DeploymentInfo.setDeployment(di);
      try
      {
         Unmarshaller unmarshaller = factory.newUnmarshaller();
         unmarshaller.unmarshal(url.toString(), resolver);
      }
      finally
      {
         DeploymentInfo.setDeployment(null);
      }
   }
}

You will notice that none of this references the schema name or its location. So how does it know what these are?

First, you can register schema binding initializers in a
```
SchemaResolverFactory
```
Second, it uses the entity resolver to lookup the location of the schema and parse it

Third, use the

SingletonSchemaResolverFactory.getInstance().getSchemaBindingResolver()

to get a

SchemaBindingResolver

and use the versions of

unmarshal

that take a resolver.