package com.oreilly.jent.jndi;

/**
 * In general, you may use the code in this book in your programs and 
 * documentation. You do not need to contact us for permission unless 
 * you're reproducing a significant portion of the code. For example, 
 * writing a program that uses several chunks of code from this book does 
 * not require permission. Selling or distributing a CD-ROM of examples 
 * from O'Reilly books does require permission. Answering a question by 
 * citing this book and quoting example code does not require permission. 
 * Incorporating a significant amount of example code from this book into 
 * your product's documentation does require permission.
 * 
 * We appreciate, but do not require, attribution. An attribution usually 
 * includes the title, author, publisher, and ISBN. For example: 
 * 
 *   "Java Enterprise in a Nutshell, Third Edition, 
 *    by Jim Farley and William Crawford 
 *    with Prakash Malani, John G. Norman, and Justin Gehtland. 
 *    Copyright 2006 O'Reilly Media, Inc., 0-596-10142-2."
 *  
 *  If you feel your use of code examples falls outside fair use or the 
 *  permission given above, feel free to contact us at 
 *  permissions@oreilly.com.
 */

/**
 * help: The help command displays help for NamingShell. If the user types
 * 
 *   help [command]
 * 
 * help invokes that command's help method.
 */

import java.util.Vector;

import javax.naming.Context;

public class help implements Command {
    public void execute(Context currentContext, Vector args) 
        throws CommandException {
        
        if (args.isEmpty())
            help();
        else {
            String commandName = (String)args.firstElement();
            Command command = NamingShell.loadCommand(commandName);
            if (command != null)
                command.help();
            else 
                throw new CommandException(new Exception(), 
                    "No help available for this command");
        }
    }
    
    public void help() { System.out.print("Usage: help [command]"); }
}