public JDBCFindEntityCommand(JDBCCommandFactory factory) 
{
   
   // Constructors --------------------------------------------------
      if (factory.getMetaData().hasReadAhead())
      {
         preloadByPrimaryKey = new JDBCPreloadByPrimaryKeyCommand(factory);
      }
      else
      {
         beanExistsCommand = factory.createBeanExistsCommand();
      }
      findEntitiesCommand = factory.createFindEntitiesCommand();
}

 public Object execute(Method finderMethod,
    Object[] args,
    EntityEnterpriseContext ctx) throws Exception 
{
      if (finderMethod.getName().equals("findByPrimaryKey"))
      {
         Object id = args[0];
         if (preloadByPrimaryKey != null)
         {
            Collection result = 
                  preloadByPrimaryKey.execute(finderMethod, args, ctx);
            if (result.size() == 0)
            {
               throw new ObjectNotFoundException("No such entity!");
            }
            return id;
         }
         else if (beanExistsCommand.execute(id))
         {
            return id;
         } 
         else
         {
            throw new ObjectNotFoundException("Object with primary key " + id +
                     " not found in storage");
         }
      }
      else
      {
         Collection result =
            (Collection)findEntitiesCommand.execute(finderMethod, args, ctx);
         if (result.size() == 0)
         {
            throw new ObjectNotFoundException("No such entity!");
         } else if (result.size() == 1)
         {
            Object [] objects = result.toArray();
            return objects[0];
         } else
         {
            throw new FinderException("More than one entity matches the " +
                  "finder criteria.");
         }
      }
}