CommandRegistry.java

/** 
 * A CommandRegistry stores all the available Command objects 
 */
public interface CommandRegistry{

  /** 
   * Queries the CommandRegistry for a command
   * @param name The command name
   * @return Command associated with the name
   * @throws CommandNotFoundException if no command can be found for the given name
   */
  Command getCommand(String name) throws CommandNotFoundException;

  /** 
   * Returns a read-only Map of this registry.
   */
  Map<String, Command> asMap();

}

MutableCommandRegistry registry = new MutableCommandRegistry();
registry.add ....
....
AeshConsoleBuilder.commandRegistry(registry);