* @internal
 */
public interface DfsReferralData {

    /**
     * 
     * @param type
     * @return the referral adapted to type
     * @throws ClassCastException
     *             if the type is not valid for this object
     */
    <T extends DfsReferralData> T unwrap ( Class<T> type );


    /**
     * @return the server this referral points to
     */
    String getServer ();


    /**
     * 

        "The network name cannot be found.",
        "ERRnomoreconn.",
        "The file exists.",
        "The parameter is incorrect.",
        "Too many Uids active on this session.",
        "The Uid is not known as a valid user identifier on this session.",
        "The pipe has been ended.",
        "The filename, directory name, or volume label syntax is incorrect.",
        "The directory is not empty.",

        } catch( InterruptedException ie ) {
            state = 0;
            thread = null;
            throw new TransportException( ie );
        } finally {
            /* This guarantees that we leave in a valid state
             */
            if (state != 0 && state != 3 && state != 4) {
                if (log.level >= 1)
                    log.println("Invalid state: " + state);
                state = 0;

    public static final String CONSTRAINTS_ScriptAssert_MESSAGE = "{constraints.ScriptAssert.message}";

    /** The key of the message: {item} must be a valid URL. */
    public static final String CONSTRAINTS_URL_MESSAGE = "{constraints.URL.message}";

    /** The key of the message: {item} is required. */

                return new SmbTreeHandleImpl(loc, this);
            }

            return connectHost(loc, loc.getServerWithDfs());
        }

    }


    /**
     * @return whether we have a valid tree connection
     */
    @SuppressWarnings ( "resource" )
    public synchronized boolean isConnected () {
        SmbTreeImpl t = getTreeInternal();
        return t != null && t.isConnected();
    }

        }
        catch ( TransportException e ) {
            cleanupThread(timeout);
            throw e;
        }
        finally {
            /*
             * This guarantees that we leave in a valid state
             */
            st = this.state;
            if ( st != 0 && st != 3 && st != 4 && st != 5 && st != 6 ) {
                log.error("Invalid state: " + st);
                this.state = 6;

            }
        }
        if ( rpc == null ) {
            return false;
        }

        boolean valid = false;
        for ( int hash : rpc.getHashAlgos() ) {
            if ( hash == pc.getHashAlgos()[ 0 ] ) {
                valid = true;
            }
        }
        if ( !valid ) {
            log.error("Server returned invalid hash selection");
            return false;
        }

        super(url, tc);
        this.pipeType = pipeType;
        setNonPooled(unshared);
        if ( !getLocator().isIPC() ) {
            throw new MalformedURLException("Named pipes are only valid on IPC$");
        }
        this.fileLocator.updateType(TYPE_NAMED_PIPE);
    }


    /**
     * Open the Named Pipe resource specified by the url

        long start = System.currentTimeMillis() / 1000 * 1000;
        // this is not too great as it depends on timing/clockskew
        // first we need to obtain a ticket, therefor need valid credentials
        // then we need to wait until the ticket is expired
        int wait = 10 * 1000;
        long princExp = start + ( wait / 2 );

                ssn.removeAttribute("npa-" + server);
            }
            if ( sae.getNtStatus() == NtStatus.NT_STATUS_ACCESS_VIOLATION ) {
                /*
                 * Server challenge no longer valid for
                 * externally supplied password hashes.
                 */
                resp.sendRedirect(req.getRequestURL().toString());
                return;
            }