package simplecli.command;

 

import java.util.*;

 

import simplecli.*;

import simplecli.error.*;

 

public class HelpCommand implements Command {

 

  public HelpCommand(Interpreter interpreter) {

    this.interpreter = interpreter;

  }

 

  public String run(Properties context,

    ArrayList parameters)

    throws SyntaxError, UnknownCommandError {

 

    switch (parameters.size()) {

      case 0: {

        // Нет параметров - возвращаем краткое описание

        // всех известных команд.

        StringBuffer sb = new StringBuffer();

        Hashtable commands = interpreter.getCommands();

        Enumeration names = commands.keys();

        while (names.hasMoreElements()) {

           String name = (String) names.nextElement();

           Command cmd = (Command) commands.get(name);

           String descr = cmd.getDescription(name);

           sb.append(name + " " + descr);

           if (names.hasMoreElements()) {

             sb.append(CRLF);

           }

        }

        if (sb.length() > 0) {

          return sb.toString();

        } else {

          return null;

        }

      }

 

      case 1: {

        // Один параметр - возвращаем полную справочную

        // информацию по команде, указанной в качестве

        // параметра.

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

        Hashtable commands = interpreter.getCommands();

        Command cmd = (Command) commands.get(name);

        if (cmd == null) {

          throw new UnknownCommandError(name);

        }

        return cmd.getHelp(name);

      }

 

      default:

        throw new SyntaxError();

    }

  }

---

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