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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
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package com.sun.jndi.dns;


import java.net.MalformedURLException;
import java.util.Hashtable;
import java.util.StringTokenizer;

import com.sun.jndi.toolkit.url.Uri;
import com.sun.jndi.toolkit.url.UrlUtil;


A DnsUrl represents a DNS pseudo-URL of the form
  dns://[host][:port][/[domain]]
or
  dns:[/][domain]

The host names a DNS server.  If the host is not provided, it
indicates that the underlying platform's DNS server(s) should be
used if possible, or that "localhost" should be used otherwise.  If
the port is not provided, the DNS default port 53 will be used.
The domain indicates the domain name of the context, and is not
necessarily related to the domain of the server; if it is not
provided, the root domain "." is used.  Special characters in
the domain name must be %-escaped as described in RFC 2396.
Author:
Scott Seligman/**
 * A DnsUrl represents a DNS pseudo-URL of the form
 * <pre>
 *   dns://[host][:port][/[domain]]
 * or
 *   dns:[/][domain]
 * </pre>
 * The host names a DNS server.  If the host is not provided, it
 * indicates that the underlying platform's DNS server(s) should be
 * used if possible, or that "localhost" should be used otherwise.  If
 * the port is not provided, the DNS default port 53 will be used.
 * The domain indicates the domain name of the context, and is not
 * necessarily related to the domain of the server; if it is not
 * provided, the root domain "." is used.  Special characters in
 * the domain name must be %-escaped as described in RFC 2396.
 *
 * @author Scott Seligman
 */


public class DnsUrl extends Uri {

    private String domain;      // domain name of the context


    
Given a space-separated list of DNS URLs, returns an array of DnsUrl
objects.
/**
     * Given a space-separated list of DNS URLs, returns an array of DnsUrl
     * objects.
     */
    public static DnsUrl[] fromList(String urlList)
            throws MalformedURLException {

        DnsUrl[] urls = new DnsUrl[(urlList.length() + 1) / 2];
        int i = 0;              // next available index in urls
        StringTokenizer st = new StringTokenizer(urlList, " ");

        while (st.hasMoreTokens()) {
            urls[i++] = new DnsUrl(st.nextToken());
        }
        DnsUrl[] trimmed = new DnsUrl[i];
        System.arraycopy(urls, 0, trimmed, 0, i);
        return trimmed;
    }

    public DnsUrl(String url) throws MalformedURLException {
        super(url);

        if (!scheme.equals("dns")) {
            throw new MalformedURLException(
                    url + " is not a valid DNS pseudo-URL");
        }

        domain = path.startsWith("/")
            ? path.substring(1)
            : path;
        domain = domain.equals("")
            ? "."
            : UrlUtil.decode(domain);

        // Debug
        // System.out.println("host=" + host + " port=" + port +
        //                    " domain=" + domain);
    }

    
Returns the domain of this URL, or "." if none is provided.
Never null.
/**
     * Returns the domain of this URL, or "." if none is provided.
     * Never null.
     */
    public String getDomain() {
        return domain;
    }


/*
    // Debug
    public static void main(String args[]) throws MalformedURLException {
        DnsUrl[] urls = fromList(args[0]);
        for (int i = 0; i < urls.length; i++) {
            System.out.println(urls[i].toString());
        }
    }
*/
}