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.
 */

/**
 * list: Command to list the contents of a JNDI context.
 */

import java.util.Vector;

import javax.naming.Context;
import javax.naming.NameClassPair;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;

public class list implements Command {
  public void execute(Context c, Vector v) throws CommandException {
        
    String name = "";
        
    // An empty string is OK for a list operation as it means
    // list children of the current context.
    if (!(v.isEmpty()))
      name = (String)v.firstElement();
        
    // Check for current context; throw an exception if there isn&rsquo;t one
    if (NamingShell.getCurrentContext() == null)
      throw new CommandException(new Exception(), 
        "Error: no current context.");

    // Call list() and then loop through the results, printing the names
    // and class names of the children
    try {
      NamingEnumeration ctxEnum = c.list(name);                
      while (ctxEnum.hasMore()) {
        NameClassPair ncPair = (NameClassPair)ctxEnum.next();
        System.out.print(ncPair.getName() + " (type ");
        System.out.println(ncPair.getClassName() + ")");
      }
    }
    catch (NamingException e) {
      throw new CommandException(e, "Couldn't list " + name);
    }
  }

  public void help() { System.out.println("Usage: list [name]"); }
}
