private void error(int errCode, String err) {
    try {
      this_mon.enter(); // what's the point of this?

      this.state = STATE_ERROR;
      this.setError(errCode, err);
      this.cleanUpFile();
      this.notifyListener();
    } finally {

      this_mon.exit();
    }
  }
  public void runSupport() {

    try {
      new URL(url_str); // determine if this is already a proper URL
    } catch (Throwable t) { // it's not

      //  			//check if the string is just a base32/hex-encoded torrent infohash
      //
      //  		String magnet_uri = UrlUtils.normaliseMagnetURI( url_str );
      //
      //  		if ( magnet_uri != null ){
      //
      //  			url_str = magnet_uri;
      //  		}
    }

    try {
      url = AddressUtils.adjustURL(new URL(url_str));

      String protocol = url.getProtocol().toLowerCase();

      // hack here - the magnet download process requires an additional paramter to cause it to
      // stall on error so the error can be reported

      //    	if ( protocol.equals( "magnet" ) || protocol.equals( "dht" )){
      //
      //    		url = AddressUtils.adjustURL( new URL(url_str+"&pause_on_error=true"));
      //    	}

      for (int i = 0; i < 2; i++) {
        try {

          //	      if ( protocol.equals("https")){
          //
          //	      	// see ConfigurationChecker for SSL client defaults
          //
          //	      	HttpsURLConnection ssl_con = (HttpsURLConnection)url.openConnection();
          //
          //	      	// allow for certs that contain IP addresses rather than dns names
          //
          //	      	ssl_con.setHostnameVerifier(
          //	      			new HostnameVerifier()
          //	      			{
          //	      				public boolean
          //	      				verify(
          //	      					String		host,
          //							SSLSession	session )
          //	      				{
          //	      					return( true );
          //	      				}
          //	      			});
          //
          //	      	con = ssl_con;
          //
          //	      }else{
          //
          con = (HttpURLConnection) url.openConnection();

          //	      }

          con.setRequestProperty(
              "User-Agent", Constants.AZUREUS_NAME + " " + Constants.AZUREUS_VERSION);

          if (referrer != null && referrer.length() > 0) {

            con.setRequestProperty("Referer", referrer);
          }

          if (request_properties != null) {

            Iterator it = request_properties.entrySet().iterator();

            while (it.hasNext()) {

              Map.Entry entry = (Map.Entry) it.next();

              String key = (String) entry.getKey();
              String value = (String) entry.getValue();

              // currently this code doesn't support gzip/deflate...

              if (!key.equalsIgnoreCase("Accept-Encoding")) {

                con.setRequestProperty(key, value);
              }
            }
          }

          this.con.connect();

          break;

          //      	}catch( SSLException e ){
          //
          //      		if ( i == 0 ){
          //
          //      			if ( SESecurityManager.installServerCertificates( url ) != null ){
          //
          //      				// certificate has been installed
          //
          //      				continue;	// retry with new certificate
          //      			}
          //      		}
          //
          //      		throw( e );
          //
        } catch (IOException e) {

          if (i == 0) {

            URL retry_url = UrlUtils.getIPV4Fallback(url);

            if (retry_url != null) {

              url = retry_url;

            } else {

              throw (e);
            }
          }
        }
      }

      int response = this.con.getResponseCode();
      if (!ignoreReponseCode) {
        if ((response != HttpURLConnection.HTTP_ACCEPTED)
            && (response != HttpURLConnection.HTTP_OK)) {
          this.error(response, Integer.toString(response) + ": " + this.con.getResponseMessage());
          return;
        }
      }

      /*
           Map headerFields = this.con.getHeaderFields();

           System.out.println("Header of download of " + url_str);
           for (Iterator iter = headerFields.keySet().iterator(); iter.hasNext();) {
      			String s = (String) iter.next();
      			System.out.println(s + ":" + headerFields.get(s));

      		}
      */
      filename = this.con.getHeaderField("Content-Disposition");
      if ((filename != null)
          && filename
              .toLowerCase()
              .matches(".*attachment.*")) // Some code to handle b0rked servers.
      while (filename.toLowerCase().charAt(0) != 'a') filename = filename.substring(1);
      if ((filename == null)
          || !filename.toLowerCase().startsWith("attachment")
          || (filename.indexOf('=') == -1)) {
        String tmp = this.url.getFile();
        if (tmp.length() == 0 || tmp.equals("/")) {
          filename = url.getHost();
        } else if (tmp.startsWith("?")) {

          // probably a magnet URI - use the hash
          // magnet:?xt=urn:sha1:VGC53ZWCUXUWVGX7LQPVZIYF4L6RXSU6

          String query = tmp.toUpperCase();

          int pos = query.indexOf("XT=URN:SHA1:");

          if (pos == -1) {

            pos = query.indexOf("XT=URN:BTIH:");
          }

          if (pos != -1) {

            pos += 12;

            int p2 = query.indexOf("&", pos);

            if (p2 == -1) {

              filename = query.substring(pos);

            } else {

              filename = query.substring(pos, p2);
            }
          } else {

            filename = "Torrent" + (long) (Math.random() * Long.MAX_VALUE);
          }

          filename += ".tmp";

        } else {
          if (tmp.lastIndexOf('/') != -1) tmp = tmp.substring(tmp.lastIndexOf('/') + 1);

          // remove any params in the url

          int param_pos = tmp.indexOf('?');

          if (param_pos != -1) {
            tmp = tmp.substring(0, param_pos);
          }

          filename = URLDecoder.decode(tmp, Constants.DEFAULT_ENCODING);
        }
      } else {
        filename = filename.substring(filename.indexOf('=') + 1);
        if (filename.startsWith("\"") && filename.endsWith("\""))
          filename = filename.substring(1, filename.lastIndexOf('\"'));

        filename = URLDecoder.decode(filename, Constants.DEFAULT_ENCODING);

        // not sure of this piece of logic here but I'm not changing it at the moment

        File temp = new File(filename);
        filename = temp.getName();
      }

      filename = FileUtil.convertOSSpecificChars(filename, false);

      //      directoryname =
      // COConfigurationManager.getDirectoryParameter("General_sDefaultTorrent_Directory");
      //      boolean useTorrentSave = COConfigurationManager.getBooleanParameter("Save Torrent
      // Files");
      directoryname = "D:\\Development\\testDownloads\\";
      boolean useTorrentSave = true;
      if (file_str != null) {
        // not completely sure about the whole logic in this block
        File temp = new File(file_str);

        // if we're not using a default torrent save dir
        if (!useTorrentSave || directoryname.length() == 0) {
          // if it's already a dir
          if (temp.isDirectory()) {
            // use it
            directoryname = temp.getCanonicalPath();
          }
          // it's a file
          else {
            // so use its parent dir
            directoryname = temp.getCanonicalFile().getParent();
          }
        }

        // if it's a file
        if (!temp.isDirectory()) {
          // set the file name
          filename = temp.getName();
        }
      }
      // what would happen here if directoryname == null and file_str == null??

      this.state = STATE_INIT;
      this.notifyListener();
    } catch (java.net.MalformedURLException e) {
      this.error(0, "Exception while parsing URL '" + url + "':" + e.getMessage());
    } catch (java.net.UnknownHostException e) {
      this.error(
          0,
          "Exception while initializing download of '"
              + url
              + "': Unknown Host '"
              + e.getMessage()
              + "'");
    } catch (java.io.IOException ioe) {
      this.error(0, "I/O Exception while initializing download of '" + url + "':" + ioe.toString());
    } catch (Throwable e) {
      this.error(0, "Exception while initializing download of '" + url + "':" + e.toString());
    }

    if (this.state == STATE_ERROR) {

      return;
    }

    try {
      final boolean status_reader_run[] = {true};

      this.state = STATE_START;

      notifyListener();

      this.state = STATE_DOWNLOADING;

      notifyListener();

      Thread status_reader =
          new AEThread("TorrentDownloader:statusreader") {
            public void runSupport() {
              boolean changed_status = false;

              while (true) {

                try {
                  Thread.sleep(100);

                  try {
                    this_mon.enter();

                    if (!status_reader_run[0]) {

                      break;
                    }
                  } finally {

                    this_mon.exit();
                  }

                  String s = con.getResponseMessage();

                  if (!s.equals(getStatus())) {

                    if (!s.toLowerCase().startsWith("error:")) {

                      if (s.toLowerCase().indexOf("alive") != -1) {

                        if (percentDone < 10) {

                          percentDone++;
                        }
                      }

                      int pos = s.indexOf('%');

                      if (pos != -1) {

                        int i;

                        for (i = pos - 1; i >= 0; i--) {

                          char c = s.charAt(i);

                          if (!Character.isDigit(c) && c != ' ') {

                            i++;

                            break;
                          }
                        }

                        try {
                          percentDone = Integer.parseInt(s.substring(i, pos).trim());

                        } catch (Throwable e) {

                        }
                      }

                      setStatus(s);

                    } else {

                      error(con.getResponseCode(), s.substring(6));
                    }

                    changed_status = true;
                  }

                } catch (Throwable e) {

                  break;
                }
              }

              if (changed_status) {

                setStatus("");
              }
            }
          };

      status_reader.setDaemon(true);

      status_reader.start();

      InputStream in;

      try {
        in = this.con.getInputStream();

      } catch (FileNotFoundException e) {
        if (ignoreReponseCode) {

          in = this.con.getErrorStream();
        } else {

          throw e;
        }

      } finally {

        try {
          this_mon.enter();

          status_reader_run[0] = false;

        } finally {

          this_mon.exit();
        }
      }

      // handle some servers that return gzip'd torrents even though we don't request it!

      String encoding = con.getHeaderField("content-encoding");

      if (encoding != null) {

        if (encoding.equalsIgnoreCase("gzip")) {

          in = new GZIPInputStream(in);

        } else if (encoding.equalsIgnoreCase("deflate")) {

          in = new InflaterInputStream(in);
        }
      }

      if (this.state != STATE_ERROR) {

        this.file = new File(this.directoryname, filename);

        boolean useTempFile = false;
        try {
          this.file.createNewFile();
          useTempFile = !this.file.exists();
        } catch (Throwable t) {
          useTempFile = true;
        }

        if (useTempFile) {
          this.file = File.createTempFile("AZU", ".torrent", new File(this.directoryname));
          this.file.createNewFile();
        }

        FileOutputStream fileout = new FileOutputStream(this.file, false);

        bufBytes = 0;

        int size = (int) UrlUtils.getContentLength(con);

        this.percentDone = -1;

        do {
          if (this.cancel) {
            break;
          }

          try {
            bufBytes = in.read(buf);

            this.readTotal += bufBytes;

            if (size != 0) {
              this.percentDone = (100 * this.readTotal) / size;
            }

            notifyListener();

          } catch (IOException e) {
          }

          if (bufBytes > 0) {
            fileout.write(buf, 0, bufBytes);
          }
        } while (bufBytes > 0);

        in.close();

        fileout.flush();

        fileout.close();

        if (this.cancel) {
          this.state = STATE_CANCELLED;
          if (deleteFileOnCancel) {
            this.cleanUpFile();
          }
        } else {
          if (this.readTotal <= 0) {
            this.error(0, "No data contained in '" + this.url.toString() + "'");
            return;
          }

          // if the file has come down with a not-so-useful name then we try to rename
          // it to something more useful

          try {
            if (!filename.toLowerCase().endsWith(".torrent")) {

              TOTorrent torrent = TorrentUtils.readFromFile(file, false);

              String name = TorrentUtils.getLocalisedName(torrent) + ".torrent";

              File new_file = new File(directoryname, name);

              if (file.renameTo(new_file)) {

                filename = name;

                file = new_file;
              }
            }
          } catch (Throwable e) {

            Debug.printStackTrace(e);
          }

          //	          TorrentUtils.setObtainedFrom( file, original_url );

          this.state = STATE_FINISHED;
        }
        this.notifyListener();
      }
    } catch (Exception e) {

      if (!cancel) {

        Debug.out("'" + this.directoryname + "' '" + filename + "'", e);
      }

      this.error(0, "Exception while downloading '" + this.url.toString() + "':" + e.getMessage());
    }
  }