code: private final Object getObject(String name)
     {
        if (m_map.containsKey(name) == false)
        {
           throw new IllegalArgumentException("Invalid column name " + name);
        }
  
        Object result = m_map.get(name);
  
        return (result);
     }
docs: Retrieve a value from the map, ensuring that a key exists in the map
  with the specified name.
  
  @param name column name
  @return column value