} catch (ClassNotFoundException cnfe) {

      throw new ClassNotFoundError();

    }

 

    Command command = null;

    try {

      command = (Command) clazz.newInstance();

    } catch (Exception e) {

      throw new ClassCastError();

    }

 

    commands.put(name, command);

 

    return null;

  }

 

  public String getDescription(String name) {

    return "Registers new command.";

  }

 

  public String getHelp(String name) {

    return "Registers new command."

      + CRLF + "Syntax: " + name + " command class";

  }

 

  private Interpreter interpreter;

 

  private final static String CRLF =

    System.getProperty("line.separator");

 

}

У команды UnregisterCommand всего один параметр, который задает команду, подлежащую удалению из системы команд.

package simplecli.command;

 

import java.util.*;

 

import simplecli.*;

import simplecli.error.*;

 

public class UnregisterCommand implements Command {

 

  public UnregisterCommand(Interpreter interpreter) {

    this.interpreter = interpreter;

  }

 

  public String run(Properties context,

    ArrayList parameters)

    throws SyntaxError, UnknownCommandError {

 

    if (parameters.size() != 1) {

      throw new SyntaxError();

    }

 

    String name = (String) parameters.get(0);

    Hashtable commands = interpreter.getCommands();

    if (commands.remove(name) == null) {

      throw new UnknownCommandError();

    }

 

---

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