/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file 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.versioned;

import org.jboss.aop.Advisor;
import org.jboss.aop.InstanceAdvisor;
import org.jboss.aop.joinpoint.Joinpoint;
import org.jboss.util.NestedRuntimeException;

import javax.naming.InitialContext;
import javax.transaction.TransactionManager;

/**
 *
 *  @author <a href="mailto:bill@jboss.org">Bill Burke</a>
 *  @version $Revision: 57186 $
 */
public class VersionedObjectInterceptorFactory implements org.jboss.aop.advice.AspectFactory
{
   private static VersionedObjectInterceptor instance = null;


   public static synchronized VersionedObjectInterceptor getInstance() 
   {
      try
      {
         if (instance == null)
         {
            InitialContext ctx = new InitialContext();
            TransactionManager tm = (TransactionManager)ctx.lookup("java:/TransactionManager");
            instance = new VersionedObjectInterceptor(tm);
         }
         return instance;
      }
      catch (Exception ex)
      {
         throw new NestedRuntimeException(ex);
      }
   }

   public Object createPerVM()
   {
      return getInstance();
   }

   public Object createPerClass(Advisor advisor)
   {
      return getInstance();
   }

   public Object createPerInstance(Advisor advisor, InstanceAdvisor instanceAdvisor)
   {
      return getInstance();
   }

   public Object createPerJoinpoint(Advisor advisor, Joinpoint jp)
   {
      return getInstance();
   }

   public Object createPerJoinpoint(Advisor advisor, InstanceAdvisor instanceAdvisor, Joinpoint jp)
   {
      return getInstance();
   }

   public String getName()
   {
      return getClass().getName();
   }

}