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.
 */

/**
 * env: Command to print the environment parameters of the current context.
 */

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

import javax.naming.Context;
import javax.naming.NamingException;

class env implements Command {
    
    public void execute(Context c, Vector v) 
        throws CommandException {
            
        if (c == null)
            throw new CommandException(new Exception(),
                "No current context");
        try {
            Hashtable env = NamingShell.getInitialContext().getEnvironment();
            Enumeration envEnum = env.keys();
            String key;
            while (envEnum.hasMoreElements()) {
                key = (String)envEnum.nextElement();
                System.out.println(key + "\t" + env.get(key));
            }

            Hashtable sysProps = System.getProperties();
            Enumeration sysEnum = sysProps.keys();
            while (sysEnum.hasMoreElements()) {
                key = (String)sysEnum.nextElement();
                System.out.println(key + "\t" + sysProps.get(key));
            }
        }
        catch (NamingException ne) {
            throw new CommandException(ne, "Couldn't get the environment of " 
                + NamingShell.getCurrentContext());
        }
    }
    
    public void help() { System.out.println("Usage: env");
    }
}