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();

}

public class MutableCommandRegistry implements CommandRegistry {
      private Map<String, Command> registry = new HashMap<String,Command>();   

     public Command getCommand(String name)  throws CommandNotFoundException {      
          Command cmd = registry.get(name);
         if (cmd == null) throw new CommandNotFoundException(name);
         return cmd;
      }

     public void addCommand(String name, Command cmd) {
         registry.put(name,cmd);
     }
    public removeCommand(String name) {
       registry.remove(name);
    }




}

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