/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, 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.ejb.plugins.cmp.jdbc.bridge;

import org.jboss.ejb.EntityEnterpriseContext;
import org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager;
import org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCCMPFieldMetaData;
import org.jboss.ejb.plugins.keygenerator.KeyGeneratorFactory;
import org.jboss.ejb.plugins.keygenerator.KeyGenerator;
import org.jboss.deployment.DeploymentException;

import javax.naming.InitialContext;
import javax.naming.NamingException;

/**
 *
 * @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
 */
public class JDBCKeyGenVersionFieldBridge extends JDBCCMP2xVersionFieldBridge
{
   private final KeyGenerator keyGenerator;

   public JDBCKeyGenVersionFieldBridge(JDBCStoreManager manager,
                                       JDBCCMPFieldMetaData metadata,
                                       String keygenFactoryName)
      throws DeploymentException
   {
      super(manager, metadata);
      keyGenerator = initKeyGenerator(keygenFactoryName);
   }

   public JDBCKeyGenVersionFieldBridge(JDBCCMP2xFieldBridge cmpField, String keygenFactoryName)
      throws DeploymentException
   {
      super(cmpField);
      keyGenerator = initKeyGenerator(keygenFactoryName);
   }

   private KeyGenerator initKeyGenerator(String keygenFactoryName) throws DeploymentException
   {
      try
      {
         InitialContext ctx = new InitialContext();
         KeyGeneratorFactory keygenFactory = (KeyGeneratorFactory)ctx.lookup(keygenFactoryName);
         return keygenFactory.getKeyGenerator();
      }
      catch(NamingException e)
      {
         throw new DeploymentException("Could not lookup key generator factory: "
            + keygenFactoryName, e);
      }
      catch(Exception e)
      {
         throw new DeploymentException("Could not create KeyGenerator instance.", e);
      }
   }

   public void setFirstVersion(EntityEnterpriseContext ctx)
   {
      Object version = keyGenerator.generateKey();
      setInstanceValue(ctx, version);
   }

   public Object updateVersion(EntityEnterpriseContext ctx)
   {
      Object next = keyGenerator.generateKey();
      setInstanceValue(ctx, next);
      return next;
   }
}
