rawfingerurlstreamhandler.java

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/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.io.*;
import java.net.*;
import java.util.*;

public class RawFingerURLStreamHandler extends URLStreamHandler {
  protected void parseURL (URL url, String spec, int start, int limit) {
    String query = spec.substring (start, limit);
    int at = query.lastIndexOf ("@");
    String user = (at > -1) ? query.substring (0, at) : query;
    StringBuffer revUser = new StringBuffer ();
    StringTokenizer t = new StringTokenizer (user, "@", true);
    while (t.hasMoreTokens ())
      revUser.insert (0, t.nextToken ().replace ('@', '/'));
    revUser.insert (0, '/');
    String location = (at > -1) ? query.substring (at + 1) : "";
    int colon = location.indexOf (":");
    int port = ((colon > -1) && (colon < location.length () - 1)) ?
      Integer.parseInt (location.substring (colon + 1)) : -1;
    String host = (colon > -1) ? location.substring (0, colon) : location;
    setURL (url, url.getProtocol (), host, port,
            revUser.toString (), url.getRef ());
  }

  protected String toExternalForm (URL url) {
    StringBuffer result = new StringBuffer ();
    String file = url.getFile ().substring (1);
    StringTokenizer files = new StringTokenizer (file, "/", true);
    while (files.hasMoreTokens ())
      result.insert (0, files.nextToken ().replace ('/', '@'));
    result.insert (0, ':').insert (0, url.getProtocol ());
    if ((url.getHost ().length () > 0) || (url.getPort () != -1))
      result.append ('@');
    result.append (url.getHost ());
    if (url.getPort () != -1)
      result.append (':').append (url.getPort ());
    if (url.getRef () != null)
      result.append ('#').append (url.getRef ());
    return result.toString ();
  }

  protected URLConnection openConnection (URL url) throws IOException {
    return new FingerURLConnection (url);
  }
}